The Developer Connection - Device Driver Kit for OS/2 3

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OS/2 Help File | 1994-03-07 | 1.3 MB | 24,967 lines

Text Truncated. Only the first 1MB is shown below. Download the file for the complete contents. ΓòÉΓòÉΓòÉ 1. Windows ΓòÉΓòÉΓòÉ To most users, a window is a rectangular area of the display screen where an application receives input from the user and displays output. This chapter describes the parts of the operating system that enable a Presentation Manager* (PM) application to create and use windows; manage relationships between windows; and size, move, and display windows. An overview of the following topics is presented: o Window types, classes, and styles o Window-creation techniques o Window messages and message queues o Methods of window input and output o Window resources and procedures o Window identification and modification. Subsequent chapters present more in-depth descriptions of windows, their advantages and uses, along with example code fragments. ΓòÉΓòÉΓòÉ 1.1. About Windows ΓòÉΓòÉΓòÉ A PM application can interact with the user and perform tasks only by way of windows. Each window shares the screen with other windows, including those from other applications. The user employs the mouse and keyboard to interact with windows and their owner applications. ΓòÉΓòÉΓòÉ 1.1.1. Desktop Window and Desktop-Object Window ΓòÉΓòÉΓòÉ OS/2* automatically creates the desktop window (known as the workplace in user terminology) when it starts a PM session. ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Desktop Window Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé Main Window 3 Γöé Γöé Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé Γöé Main Window 2 Γöé Γöé Γöé Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöñ Main Window 1 Γöé Γöé Γöé Γöé Γöé ΓöéChiΓöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé Γöé Γöé ΓöéWinΓöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé2A Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓööΓöÇΓöÇΓöÇΓöñ ΓöéChild Window 1aΓöé Γöé Γöé Γöé Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Γöé Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé Child Window 1b Γöé Γöé Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Desktop Window Containing Windows of Several Applications The desktop window paints the background color of the screen and serves as the "progenitor" of all the windows displayed by all PM applications (but not of object windows, which do not require screen display). To make the desktop the parent in the WinCreateStdWindow function, you specify HWND_DESKTOP. The windows immediately below the desktop are called main or top-level windows; these are called primary windows in user terminology. Every PM application creates at least one window to serve as the main window for that application. Most applications also create many other windows, directly or indirectly, to perform tasks related to the main window. Each window helps display output and receive input from the user. The previous figure shows the desktop window containing windows of several applications. Notice that the main windows can overlap one another. (At times, it is possible for a main window to be completely hidden.) Operations in one main window normally do not affect the other main windows. The desktop-object window is like a desktop window that is never displayed; it serves as the base window to coordinate the activity of an application's object windows. The desktop-object window cannot display windows nor process keyboard and mouse input. The primary purpose of the desktop-object window is to enable you to create windows that need not respond to messages at the same rate as the user interface. ΓòÉΓòÉΓòÉ 1.1.2. Window Relationships ΓòÉΓòÉΓòÉ Window relationships define how windows interact with each other-on the screen and through messages. There are parent-child window relationships and window-owner relationships. The parent-child relationship determines where and how windows appear when drawn on the screen. It also determines what happens to a window when a related window is destroyed or hidden. The parent-child rules apply to all windows at all times and cannot be modified. Ownership determines how windows communicate using messages. Cooperating windows define and carry out their rules of ownership. Although some windows (such as windows of the preregistered public window class, WC_FRAME) have very complex rules of ownership, the application usually defines the ownership rules. The following figure represents the logical relationship of the windows in two applications. Desktop Window ΓöîΓöÇΓöÉ Application 1 Γöé Γöé Application 2 ΓöîΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÉ Γöé Γöé ΓöîΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÉ ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÿ ΓööΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé Γöé Γöé Γöé Γöé Main Window 1 Γöé Γöé Main Window 2 Γöé Γöé Γöé Γöé Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé Γöé ΓööΓöÇΓöÿ ΓööΓöÇΓöÿ ΓööΓöÇΓöÿ Γöé Child Child Γöé Γöé Child Child Γöé Window 1.1 Window 1.2 Window 2.1 Window 2.2 Γöé Γöé Γöé Γöé Γöé Γöé ΓööΓöÇΓöÿ Γöé Child Γöé Γöé Γöé Window 1.1.1 ΓööΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÿ ΓööΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÿ Typical Window Relationships ΓòÉΓòÉΓòÉ 1.1.2.1. Parent-Child Relationship ΓòÉΓòÉΓòÉ Most windows have a parent window. (The exceptions are the desktop and desktop-object windows, which the system creates at system startup.) An application specifies the parent when it creates a window; then, the system uses the parent to determine where and how to draw any new windows, as well as when to destroy the windows (free all associated resources and remove the windows from the screen). A child window is drawn relative to its parent. The coordinates given to specify the position of a window's lower-left corner are relative to the lower-left corner of its parent. For example, a main window (child of the desktop) is drawn relative to the lower-left corner of the screen (the desktop window's lower-left corner). All main windows are siblings because they share a common parent, the desktop window. Because sibling windows can overlap, an application or a user arranges the windows, one behind another (like a stack of papers on a desk), in the desired viewing order (called z-order). Z-order uses the desktop as a reference point for a "three-dimensional" ranking of the overlapping windows: the topmost window has the highest ranking, while the window at the bottom of the stack has the lowest ranking. The parent of the sibling windows is always at the bottom of the z-order. The following figure illustrates the hierarchy of such an arrangement. ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Desktop Γöé ΓööΓöÇΓöÇΓö¼ΓöÇΓö¼ΓöÇΓö¼ΓöÇΓöÇΓöÿ Γöé Γöé Γöé Parent Child Γöé Γöé Γöé ΓöîΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇΓöÉ Γöé Γöé Γöé Siblings Γöé Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé Γöé ΓööΓöÇΓöÇΓöé Main 1 Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöé Child 1A Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÉ Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Γöé Γöé Γöé Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöé Child 1A Γöé Γöé Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Γöé Γöé ΓööΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇ ΓöÇΓöÿ Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöé Main 2 Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöé Child 2A Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöé Main 3 Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Window Hierarchy Although PM supports z-order, it does not enforce the expected appearance unless you specify the CS_CLIPCHILDREN or CS_CLIPSIBLINGS styles. No part of a child window ever appears outside the borders of its parent. If an application creates a window that is larger than its parent, or positions a window so that some or all of it extends beyond the borders of the parent, the extended portion of the child window is not drawn. An application can use the WS_CLIPCHILDREN or WS_CLIPSIBLINGS styles to remove from a window's clipping area (the area in which the window can paint) the area occupied by its child or sibling windows. For example, an application can use these styles to prevent a window from painting over a child or sibling window containing a complex graphic that would be time-consuming to redraw. When a window is minimized, hidden, or destroyed, all of its children are hidden, minimized, or destroyed as well. The order of destruction is always such that every window is destroyed before its parent. The window-destruction sequence starts at the bottom of descendancy so that all related windows can be cleaned up; the last one to go is the window you asked to be destroyed. The final PM task in a window-destruction sequence is to send a WM_DESTROY message to that window, so it has one last chance to release any resources it has allocated and may still be holding. Every window has only one parent, but can have any number of children. window in this tree is said to be a descendant of any window appearing above it in the branch, and an ancestor of any window appearing below it. There are two special cases, of course: the window immediately above is called the window's parent, and any window immediately below it is called its child. An application can change a window's parent window at any time by using the WinSetParent function. Changing the parent window also changes where and how the child window is drawn. The system displays the child within the borders of the new parent and draws the window according to the styles specified for the new parent. ΓòÉΓòÉΓòÉ 1.1.2.2. Ownership ΓòÉΓòÉΓòÉ Any window can have an owner window. Typically, an application uses ownership to establish a connection between windows so that they can perform useful tasks together. For example, the title bar in an application's main window is owned by the frame window; but, together, the user can move the entire main window by clicking the mouse in the title bar and dragging. An application can set the owner window when it creates the window or at a later time. Ownership establishes a relationship between windows that is independent of the parent-child relationship. While there are few predefined rules for owner- and owned-window interaction, a window always notifies its owner of anything considered a significant event. The preregistered public window classes provided by OS/2* recognize ownership. Control windows of classes such as WC_TITLEBAR and WC_SCROLLBAR, notify their owners of events; frame windows, of class WC_FRAME, receive and process notification messages from the control windows they own. For example, a title-bar control sends a notification message to its owner when it receives a mouse click. If the owner is a frame window, it receives the notification message and prepares to move itself and its children. Owner and owned windows must be created by the same thread; that is, they must belong to the same message queue. Because ownership is independent of the parent-child relationship, the owner and owned windows do not have to be descendants of the same parent window. However, this can affect how windows are destroyed. Destroying an owner window does not necessarily destroy an owned window. Except for frame windows, an application that needs to destroy an owned window that is not a descendant of the owner window must do so explicitly. Frame windows sometimes own windows that are not descendants but, instead, are siblings. A frame window has the following special ownership properties: o When the frame window is destroyed, it destroys all of the windows it owns, even if they are not descendants. o When a frame window moves, the windows it owns move also. Owned windows that are not descendants maintain their positions, relative to the upper-left (not the usual lower-left) corner of the owner window. An owned window with the style FS_NOMOVEWITHOWNER does not move. o When the frame window changes its position in the z-order, it changes the z-order of all the windows it owns. o When the frame window is minimized or hidden, it hides all the windows it owns. Owned windows hidden this way are restored when the frame window is restored. If an application needs this type of special processing for its own window classes, it must provide that support in the window procedures for those classes. ΓòÉΓòÉΓòÉ 1.1.2.3. Object Windows ΓòÉΓòÉΓòÉ Any descendant of the desktop-object window is called an object window. Typically, an application uses an object window to provide services for another window. For example, an application can use an object window to manage a shared database. In this way, a window can obtain information from the shared database by sending a message to and receiving a reply from the object window. Only two system-defined messages are available to an object window- WM_CREATE and WM_DESTROY-but the object window enables the user to implement a set of user-defined messages. The window procedure for an object window does not have to process paint messages or user input. The object window processes only messages that affect the data belonging to the object. HWND_OBJECT is the only identifier needed to create an object window. It is very unwise to create descendants of HWND_OBJECT in the same thread that creates descendants of HWND_DESKTOP: this causes the system to hang up or, at the very least, behave slowly. Object windows, sometimes referred to as orphan windows, require no owner. The rules for parent-child and ownership relationships also apply to object windows. In particular, changing the parent window of an object window to the desktop window, or to a descendant of the desktop window, causes the system to display the object window if the object window has the WS_VISIBLE style. ΓòÉΓòÉΓòÉ 1.1.3. Application Windows ΓòÉΓòÉΓòÉ An application can use several types of secondary windows: frame windows, client windows, control windows, dialog windows, message boxes, and menus. Typically, an application's main window consists of several of these windows acting as one. The following figure shows an example of a main window and its secondary windows. Main Window with Secondary Windows A frame window is a window that an application uses as the base when constructing a main window or other composite window, such as a dialog window or message box. (A composite window is a collection of windows that interact with one another and are kept together as a unit.) A frame window provides basic features, such as borders and a menu bar. Frame windows have a set of resources associated with them. These include icons, menus, and accelerators (shortcut keys to the user), which, typically, are defined in an application's resource file. A dialog window is a frame window that contains one or more control windows. Dialog windows are used almost exclusively for prompting the user for input. An application usually creates a dialog window when it needs additional information to complete a command. The application destroys the dialog window after the user has provided the requested information. A message box is a frame window that an application uses to display a note, caution, or warning to the user. For instance, an application can use a message box to inform the user of a problem that the application encountered while performing a task. A client window is the window in which the application displays the current document or data. For example, a desktop-publishing application displays the current page of a document in a client window. Most applications create at least one client window. The application must provide a function, called a window procedure, to process input to the client window and to display output. A control window is a window used in conjunction with another window to perform useful tasks, such as displaying a menu or scrolling information in a client window. The operating system provides several predefined control-window classes that an application can use to create control windows. Control windows include buttons, entry fields, list boxes, combination boxes, menus, scroll bars, static text, and title bars. A menu is a control window that presents a list of commands and other menus to the user. Using a mouse or the keyboard, the user can select a task; the application then performs the selected task. ΓòÉΓòÉΓòÉ 1.1.4. Window Input and Output ΓòÉΓòÉΓòÉ The user directs input data to windows from a mouse and the keyboard. Keyboard input goes to the window with input focus, and, normally, mouse input goes to the window under the mouse pointer. Windows also are places to display output data. PM uses windows to display text and graphics on the screen and to process input from the mouse and keyboard. Windows provide the same input and output capabilities as a virtual graphics terminal without having direct control of the hardware. An application is responsible for painting the data for the window classes it registers and creates. This data can be graphics text or pictures or fixed-size alphanumeric text. Normally it is not necessary for the application to paint the system-provided window classes; the OS/2 window procedures for those window classes do the painting. ΓòÉΓòÉΓòÉ 1.1.4.1. Active Window and Focus Window ΓòÉΓòÉΓòÉ All frame-window ancestors of the input focus window are said to be active, meaning that the user interacts with them. The active window usually is the topmost main window, which is positioned above all other top-level windows on the screen. The active window is indicated by some form of highlighting. For example, a highlighted title bar shows that a standard frame window is active; an active dialog window has a highlighted border. These types of highlighting ensure that the user can see the window that is accepting input. A main window (or one of its child windows) is activated by using a mouse or the keyboard. When a window is activated, it receives a WM_ACTIVATE message with its first parameter set to TRUE. When it is deactivated, it receives a WM_ACTIVATE message with its first parameter set to FALSE. The following figure illustrates user interaction with a window. User Input to a Window The focus window can be the active window or one of its descendant windows. The user can change the input focus the same way active windows are changed-by mouse or keyboard. However, the application has more control over the input focus. For example, in a window containing several text entry fields, the tab keys can move the input focus from one input field to another. A WM_SETFOCUS message is sent to the window procedure when a window is gaining or losing the input focus. The WinQueryFocus function tells the user which window has the input focus. ΓòÉΓòÉΓòÉ 1.1.4.2. Messages ΓòÉΓòÉΓòÉ Messages are a fundamental part of the operating system. PM applications use messages to communicate with the operating system and one another. The system uses messages to communicate with applications to ensure concurrent running and sharing of devices. Typically, a message notifies the receiving application that an event has occurred. The operating system identifies the appropriate application window to receive a message by the window handle included in the message. Sources of events that cause messages to be issued to applications are the user, the operating system, the application, or another application. ΓòÉΓòÉΓòÉ 1.1.4.2.1. The User ΓòÉΓòÉΓòÉ Mouse or keyboard input to an application window causes the operating system to direct messages to that window. ΓòÉΓòÉΓòÉ 1.1.4.2.2. The Operating System ΓòÉΓòÉΓòÉ Managing the application windows on the screen, the operating system issues messages to the windows, usually as an indirect result of user interaction. These messages enable the system to work in a uniform and well-ordered manner. For example, where several application windows overlap, and the user terminates an application so that its window disappears, the operating system issues messages to the underlying application windows so that they can repaint themselves. ΓòÉΓòÉΓòÉ 1.1.4.2.3. The Application ΓòÉΓòÉΓòÉ An event can occur in the application to which another part of that application should respond; for example, when the contents of its window no longer accurately reflect the status of the application. The application can define its own messages outside the range of system-defined messages to communicate such events. ΓòÉΓòÉΓòÉ 1.1.4.2.4. Another Application ΓòÉΓòÉΓòÉ Communication with other applications through the operating system ensures cooperative use of the system; it even can be used to exchange data. For example, an arithmetic application can supply the results of a lengthy calculation to a business graphics application. ΓòÉΓòÉΓòÉ 1.1.4.3. Enabled and Disabled Windows ΓòÉΓòÉΓòÉ An application uses the WinEnableWindow function to enable or disable window input. By default, a window is enabled when it is created. However, an application can disable a newly created window. An application usually disables a window to prevent the user from using the window. For example, an application might disable a push button in a dialog window. Enabling a window restores normal input; an application can enable a disabled window at any time. When an application uses the WinEnableWindow function to disable an existing window, that window also loses keyboard focus. WinEnableWindow sets the keyboard focus to NULL, which means that no window has the focus. If a child window or other descendant window has the keyboard focus, it loses the focus when the parent window is disabled. An application can determine whether a window is enabled by calling WinIsWindowEnabled. ΓòÉΓòÉΓòÉ 1.1.4.4. System-Modal Window ΓòÉΓòÉΓòÉ An application can designate a system-modal window: a window that receives all keyboard and mouse input, effectively disabling all other windows. The user must respond to the system-modal window before continuing work in other windows. An application sets and clears the system-modal window by using the WinSetSysModalWindow function. Because system-modal windows have absolute control of input, you must be careful when using them in your applications. Ideally, an application uses a system-modal window only when there is danger of losing data if the user does not respond to a problem immediately. Although an application can destroy a system-modal window, the new active window then becomes a system-modal window. An application can make another window active while the first system-modal window exists. But again, the new active window will become the system-modal window. In general, once a system-modal window is set, it continues to exist in the PM session until the application explicitly clears it. ΓòÉΓòÉΓòÉ 1.1.5. Window Creation ΓòÉΓòÉΓòÉ Before any thread in an application can create windows, it must: 1. Call WinInitialize to create an anchor block 2. Call WinCreateMsgQueue to create a message queue for the thread. Then, it can create one or more windows by calling one of the window-creation functions, such as WinCreateWindow. The window-creation functions require that the following information be supplied in some form: o Class o Styles o Name o Parent window o Position relative to the parent window o Position relative to any sibling windows (z-order) o Dimensions o Owner window o Identifier o Class-specific data o Resources. Every window belongs to a window class that defines that window's appearance and behavior. The chief component of the window class is the window procedure. The window procedure is the function that receives and processes all messages sent to the window. Every window has a style. The window style specifies aspects of a window's appearance and behavior that are not specified by the window's class. For example, the WC_FRAME class always creates a frame window, but the FS_BORDER, FS_DLGBORDER, and FS_SIZEBORDER styles determine the style of a frame window's border. A few window styles apply to all windows, but most apply only to windows of specific window classes. The window procedure for a given class interprets the style and allows an application to adapt a window of a given class for a special circumstance. For example, an application can give a window the style WS_SYNCPAINT to cause it to be painted immediately whenever any portion of the window becomes invalid. Normally, a window is painted only if there are no messages waiting in the message queue. A window can have a text string associated with it. Typically, the window text is displayed in the window or in a title bar. The class of window determines whether the window displays the text and, if so, where the text appears within the window. Every window except the desktop window and desktop-object window has a parent window. The parent provides the coordinate system used to position the window and also affects aspects of a window's appearance. For example, when the parent window is minimized, hidden, or destroyed, the parent's child windows are minimized, hidden, or destroyed also. Every window has a screen position, size, and z-order position. The screen position is the location of the window's lower-left corner, relative to the lower-left corner of its parent window. A window's size is its width and height, measured in pels. A window's z-order position is the position of the window in the order of overlapping windows. This viewing order is oriented along an imaginary axis, the z axis, extending outward from the screen. The window at the top of the z-order overlaps all sibling windows (that is, windows having the same parent window). A window at the bottom of the z-order is overlapped by all sibling windows. An application sets a window's z-order position by placing it behind a given sibling window or at the top or bottom of the z-order of the windows. A window can own, or be owned by, another window. The owner-owned relationship affects how messages are sent between windows, allowing an application to create combinations of windows that work together. A window issues messages about its state to its owner window; the owner window issues messages back about what action to perform next. The window handle is a unique number across the system that is totally unambiguous-it identifies one particular window in the system and is assigned by the system. A window identifier is analogous to a "given" name in family relationships-the only requirement is that the name be unique among siblings. A window can have class-specific data that further defines how the window appears and behaves when it is created. The system passes the class-specific data to the window procedure, which then applies the data to the new window. ΓòÉΓòÉΓòÉ 1.1.5.1. Window-Creation Functions ΓòÉΓòÉΓòÉ The basic window-creation function is WinCreateWindow. This function uses information about a window's class, style, size, and position to create a new window. All other window-creation functions, such as WinCreateStdWindow and WinCreateDlg, supply some of this information by default and create windows of a specific class or style. Although the WinCreateWindow function provides the most direct means of creating a window, most applications do not use it. Instead, they often use the WinCreateStdWindow function to create a main window and the WinDlgBox or WinCreateDlg functions to create dialog windows. The WinCreateMenu, WinLoadMenu, WinLoadDlg, WinMessageBox, and WinCreateFrameControls functions also create windows. Each of these functions substitutes for one or more required calls to WinCreateWindow to create a given window. For example, an application can create a frame window, one or more control windows, and a client window in a single call to WinCreateStdWindow. ΓòÉΓòÉΓòÉ 1.1.5.2. Window-Creation Messages ΓòÉΓòÉΓòÉ While creating a window, the system sends messages to that window's window procedure. The window procedure receives a WM_CREATE message, saying that the window is being created. The window also receives a WM_ADJUSTWINDOWPOS message, specifying the initial size and position of the window being created. This message lets the window procedure adjust the size and position of the window before the window is displayed. The system also sends other messages while creating a window; the number and order of these messages depend on the class and style of the window and the function used to create it. ΓòÉΓòÉΓòÉ 1.1.6. Window Classes ΓòÉΓòÉΓòÉ Each window of a specific window class uses the window procedure associated with that class. An application can create one or more windows that belong to the same window class. Because each window of the same class is processed by the same window procedure, they all behave the same way. Since many windows can result from one window procedure, coding overhead is greatly reduced. There are two types of window classes: public and private. ΓòÉΓòÉΓòÉ 1.1.6.1. Public Window Classes ΓòÉΓòÉΓòÉ A public window class is one that has a reentrant window procedure that is registered and resides in a dynamic link library (DLL); it can be used by any process in the system to create windows. The operating system provides several preregistered public window classes. You can specify the system-provided window classes by using the symbolic identifiers that have the prefix WC_, as shown in the following table: Window Classes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéClass Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_BUTTON ΓöéConsists of buttons and boxes the user can Γöé Γöé Γöéselect by clicking the pointing device or Γöé Γöé Γöéusing the keyboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_CONTAINER ΓöéCreates a control for the user to group Γöé Γöé Γöéobjects in a logical manner. A container canΓöé Γöé Γöédisplay those objects in various formats or Γöé Γöé Γöéviews. The container control supports drag Γöé Γöé Γöéand drop so the user can place information inΓöé Γöé Γöéa container by simply dragging and dropping. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_ENTRYFIELD ΓöéConsists of a single line of text that the Γöé Γöé Γöéuser can edit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_FRAME ΓöéA window class that can contain child windowsΓöé Γöé Γöéof many of the other window classes. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_LISTBOX ΓöéPresents a list of text items from which the Γöé Γöé Γöéuser can make selections. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_MENU ΓöéPresents a list of items that can be Γöé Γöé Γöédisplayed horizontally as menu bars, or Γöé Γöé Γöévertically as pull-down menus. Menus usuallyΓöé Γöé Γöéare used to provide a command interface to Γöé Γöé Γöéapplications. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_NOTEBOOK ΓöéCreates a control for the user that is Γöé Γöé Γöédisplayed as a number of pages. The top pageΓöé Γöé Γöéis visible, and the others are hidden, with Γöé Γöé Γöétheir presence being indicated by a visible Γöé Γöé Γöéedge on each of the back pages. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SCROLLBAR ΓöéLets the user scroll the contents of an Γöé Γöé Γöéassociated window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SLIDER ΓöéCreates a control that is usable for Γöé Γöé Γöéproducing approximate (analog) values or Γöé Γöé Γöéproperties. Scroll bars were used for this Γöé Γöé Γöéfunction in the past, but the slider providesΓöé Γöé Γöéa more flexible method of achieving the same Γöé Γöé Γöéresult, with less programming effort. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SPINBUTTON ΓöéCreates a control that presents itself to theΓöé Γöé Γöéuser as a scrollable ring of choices, giving Γöé Γöé Γöéthe user quick access to the data. The user Γöé Γöé Γöéis presented only one item at a time, so the Γöé Γöé Γöéspin button should be used with data that is Γöé Γöé Γöéintuitively related. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_STATIC ΓöéSimple display items that do not respond to Γöé Γöé Γöékeyboard or pointing device events. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_TITLEBAR ΓöéDisplays the window title or caption and letsΓöé Γöé Γöéthe user move the window's owner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_VALUESET ΓöéCreates a control similar in function to the Γöé Γöé Γöéradio buttons but provides additional Γöé Γöé Γöéflexibility to display graphical, textual, Γöé Γöé Γöéand numeric formats. The values set with Γöé Γöé Γöéthis control are mutually exclusive. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ With the exception of WC_FRAME, the system-provided window classes are known as control window classes, because they give the user an easy means of controlling specific types of interaction. For example, the WC_BUTTON class allows single or multiple selections. These windows conform to the IBM* Systems Application Architecture* (SAA*) Common User Access* (CUA*) definition. They are designed specifically to provide function that meets the needs for a graphics-based standard user interface. The code fragments provided in this guide make extensive use of the system window classes. ΓòÉΓòÉΓòÉ 1.1.6.2. Private Window Classes ΓòÉΓòÉΓòÉ A private window class is one that an application registers for its own use; it is available only to the process that registers it. The application-provided window procedure for a private window class resides either in the application's executable files or in a DLL file. A private window class is deleted when its registering process is terminated. ΓòÉΓòÉΓòÉ 1.1.7. Window Styles ΓòÉΓòÉΓòÉ A window can have a combination of styles; an application can combine styles by using the bitwise inclusive OR operator. An application usually sets the window styles when it creates the window. The OS/2 operating system provides several standard window styles that apply to all windows. It also provides many styles for the predefined frame and control windows. The frame and control styles are unique to each predefined window class and can be used only for windows of the corresponding class. Initially, the styles of the window class used to create the window determine the styles of the new window. For example, if the window class has the style CS_SYNCPAINT, all windows created using that class, by default, will have the window style WS_SYNCPAINT. The OS/2 operating system has the following standard window styles: Standard Window Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_CLIPCHILDRENΓöéPrevents a window from painting over its Γöé Γöé Γöéchild windows. This style increases the time Γöé Γöé Γöénecessary to calculate the visible region. Γöé Γöé ΓöéThis style is usually not necessary, because Γöé Γöé Γöéif the parent and child windows overlap and Γöé Γöé Γöéboth are invalidated, the system draws the Γöé Γöé Γöéparent window before drawing the child Γöé Γöé Γöéwindow. If the child window is invalidated Γöé Γöé Γöéindependently of the parent window, the Γöé Γöé Γöésystem redraws only the child window. If the Γöé Γöé Γöéupdate region of the parent window does not Γöé Γöé Γöéintersect the child window, drawing the Γöé Γöé Γöéparent window causes the child window to be Γöé Γöé Γöéredrawn. This style is useful to prevent a Γöé Γöé Γöéchild window that contains a complex graphic Γöé Γöé Γöéfrom being redrawn unnecessarily. Γöé Γöé ΓöéWS_CLIPCHILDREN is an absolute requirement ifΓöé Γöé Γöéa window with children ever performs output Γöé Γöé Γöéin response to any message other than Γöé Γöé ΓöéWM_PAINT. Only WM_PAINT processing is Γöé Γöé Γöésynchronized such that the children will get Γöé Γöé Γöétheir messages after the parent. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_CLIPSIBLINGSΓöéPrevents a window from painting over its Γöé Γöé Γöésibling windows. This style protects sibling Γöé Γöé Γöéwindows but increases the time necessary to Γöé Γöé Γöécalculate the visible region. This style is Γöé Γöé Γöéappropriate for windows that overlap and thatΓöé Γöé Γöéhave the same parent window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_DISABLED ΓöéUsed by an application to disable a window. Γöé Γöé ΓöéIt is up to the window to recognize this Γöé Γöé Γöéstyle and reject input. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_GROUP ΓöéSpecifies the first control of a group of Γöé Γöé Γöécontrols in which the user can move from one Γöé Γöé Γöécontrol to the next by using the ARROW keys. Γöé Γöé ΓöéAll controls defined after the control with Γöé Γöé Γöéthe WS_GROUP style belong to the same group. Γöé Γöé ΓöéThe next control with the WS_GROUP style endsΓöé Γöé Γöéthe first group and starts a new group. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_MAXIMIZED ΓöéEnlarges a window to the maximum size. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_MINIMIZED ΓöéReduces a window to the size of an icon. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_PARENTCLIP ΓöéExtends a window's visible region to include Γöé Γöé Γöéthat of its parent window. This style Γöé Γöé Γöésimplifies the calculation of the child Γöé Γöé Γöéwindow's visible region but is potentially Γöé Γöé Γöédangerous, because the parent window's Γöé Γöé Γöévisible region is usually larger than the Γöé Γöé Γöéchild window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_SAVEBITS ΓöéSaves the screen area under a window as a bitΓöé Γöé Γöémap. When the user hides or moves the window,Γöé Γöé Γöéthe system restores the image by copying the Γöé Γöé Γöébits; there is no need to add the area to theΓöé Γöé Γöéuncovered window's update region. The style Γöé Γöé Γöécan improve system performance but also can Γöé Γöé Γöéconsume a great deal of memory. It is Γöé Γöé Γöérecommended only for transient windows, such Γöé Γöé Γöéas menus and dialog windows, not for main Γöé Γöé Γöéapplication windows. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_SYNCPAINT ΓöéCauses a window to receive WM_PAINT messages Γöé Γöé Γöéimmediately after a part of the window Γöé Γöé Γöébecomes invalid. Without this style, the Γöé Γöé Γöéwindow receives WM_PAINT messages only if no Γöé Γöé Γöéother message is waiting to be processed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_TABSTOP ΓöéSpecifies one of any number of controls Γöé Γöé Γöéthrough which the user can move by tabbing. Γöé Γöé ΓöéPressing the TAB key moves the keyboard focusΓöé Γöé Γöéto the next control that has the WS_TABSTOP Γöé Γöé Γöéstyle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWS_VISIBLE ΓöéMakes a window visible. The operating system Γöé Γöé Γöédraws the window on the screen unless Γöé Γöé Γöéoverlapping windows completely obscure it. Γöé Γöé ΓöéWindows without this style are hidden. If Γöé Γöé Γöéoverlapping windows completely obscure the Γöé Γöé Γöéwindow, the window is still considered Γöé Γöé Γöévisible. (Visibility means that the operatingΓöé Γöé Γöésystem draws the window if it can.) Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 1.1.8. Window Handles ΓòÉΓòÉΓòÉ After creating a window, the creation function returns a window handle that uniquely identifies the window. An application can use this handle to direct the action of functions to the window. Window handles have the data type HWND; applications must use this data type when declaring variables that hold window handles. There are special constants that an application can use instead of a window handle in certain functions. For example, an application can use HWND_DESKTOP in the WinCreateWindow function to specify the desktop window as the new window's parent. Similarly, HWND_OBJECT represents the desktop-object window. HWND_TOP and HWND_BOTTOM represent the top and bottom positions relative to the z-order position of a window. Although the NULL constant is not a window handle, an application can use it in some functions to specify that no window is affected. For example, an application can use NULL in the WinCreateWindow function to create a window that has no owner window. Some functions might return NULL, indicating that the given action applies to no window. ΓòÉΓòÉΓòÉ 1.1.9. Window Size and Position ΓòÉΓòÉΓòÉ A window's size and position can be expressed as a bounding rectangle, given in coordinates relative to its parent. An application specifies the window's initial size and position when creating the window. To use the system-default values for the initial size and position of a frame window, an application can specify the FCF_SHELLPOSITION frame-creation flag. The application can change a window's size and position at any time. The following figure indicates the size and position coordinates of a parent window and a child window. Window Sizing and Positioning Note: The default coordinate system for a window specifies that the point (0,0) is at the lower-left corner of the window, with coordinates increasing as they go upward and to the right. A window can be positioned anywhere in relation to its parent. ΓòÉΓòÉΓòÉ 1.1.9.1. Size ΓòÉΓòÉΓòÉ A window's size (width and height) is given in pels, in the range 0 through 65535. A window can have 0 width and height; however, a window with 0 width or height is not drawn on the screen, even though it has the WS_VISIBLE style. An application can create very large windows; however, it should check the size of the screen before enlarging a window size. One way to choose an appropriate size is to use the WinGetMaxPosition function to retrieve the size of the maximized window. A window that is larger than its maximized size will be larger than the screen also. An application can retrieve the current size of the window by using the WinQueryWindowRect function. ΓòÉΓòÉΓòÉ 1.1.9.2. Position ΓòÉΓòÉΓòÉ A window's position is defined as the x,y coordinates of its lower-left corner. These coordinates, sometimes called window coordinates, always are relative to the lower-left corner of the parent window. For example, a window having the coordinates (10,10) is placed 10 pels to the right of, and 10 pels up from, the lower-left corner of its parent window. Notice, however, that a window can be positioned anywhere in relation to its parent, but always relative to the parent's lower-left corner. Adjusting a window's position can improve drawing performance. For example, an application could position a window so that its horizontal position is a multiple of 8, relative to the screen origin (the lower-left corner of the screen). Coordinates that are multiples of 8 correspond to byte boundaries in the screen-memory bit map. It is usually faster to start drawing at a byte boundary. By default, the system positions a frame window on a byte boundary; but an application can override this action by using the FCF_NOBYTEALIGN style when creating the window. ΓòÉΓòÉΓòÉ 1.1.9.3. Size and Position Messages ΓòÉΓòÉΓòÉ A window receives messages when it changes size or position. Before a change is made, the system might send a WM_ADJUSTWINDOWPOS message to allow the window procedure to make final adjustments to the window's size and position. This message includes a pointer to an SWP structure that contains the requested width, height, and position. If the window procedure adjusts these values in the structure, the system uses the adjusted values to redraw the window. The WM_ADJUSTWINDOWPOS message is not sent if the change is a result of a call to the WinSetWindowPos function with the SWP_NOADJUST constant specified. After a change has been made to a window, the system sends a WM_SIZE message to specify the new size of the window. If the window has the class style CS_MOVENOTIFY, the system also sends a WM_MOVE message, which includes the new position for the window. The system sends a WM_SHOW message if the visibility of the window has changed. ΓòÉΓòÉΓòÉ 1.1.9.4. System Commands ΓòÉΓòÉΓòÉ An application that has a window with a system menu can change the size and position of that window by sending system commands. The system commands are generated when the user chooses commands from the system menu. An application can emulate the user action by sending a WM_SYSCOMMAND message to the window. Following are some of the system commands: System Commands ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCommand ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSC_SIZE ΓöéStarts a Size command. The user can change Γöé Γöé Γöéthe size of the window with a mouse and the Γöé Γöé Γöékeyboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSC_MOVE ΓöéStarts a Move command. The user can move theΓöé Γöé Γöéwindow with a mouse and the keyboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSC_MINIMIZE ΓöéMinimizes the window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSC_MAXIMIZE ΓöéMaximizes the window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSC_RESTORE ΓöéRestores a minimized or maximized window to Γöé Γöé Γöéits previous size and position. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSC_CLOSE ΓöéCloses the window. This command sends a Γöé Γöé ΓöéWM_CLOSE message to the window. The window Γöé Γöé Γöéperforms all tasks needed to clean up and Γöé Γöé Γöédestroy itself. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 1.1.10. Window Data ΓòÉΓòÉΓòÉ Every window has an associated data structure. The window data structure contains all the information specified for the window at the time it was created and any additional information supplied for the window since that time. Although the exact size and meaning of the information in the window data structure are private to the system, an application can access any of the following data items via system-provided functions: o Pointer to window-instance data structure o Pointer to window procedure o Parent-window handle o Owner-window handle o Handle of first child window o Handle of next sibling window o Window size and position (expressed as a rectangle) o Window style o Window identifier o Update-region handle o Message-queue handle. An application can examine and modify this data by using functions such as WinQueryWindowUShort and WinSetWindowUShort. These functions let an application access data that is stored as 16-bit integers. Other functions let an application access data containing 32-bit integers and pointers. Several functions indirectly affect the data items in the window data structure. For example, the WinSubclassWindow function replaces the window-procedure pointer, and the WinSetWindowPos function changes the size and position of the window. An application can extend the number of available data items in the window data structure by specifying a count of extra bytes when it registers the corresponding window class. Then, the window procedure can use these bytes to store information about the window. The WinQueryWindowUShort and WinSetWindowUShort functions give direct access to the extra bytes. It generally is not a good idea to use direct storage in the window data. It is better to allocate a data structure dynamically and set a pointer to that data structure in the window words. This provides two advantages: 1. Most importantly, it is a symbolic way of referencing the data structure. It is very easy to make mistakes and provide the wrong offsets to WinQueryWindowUShort and so forth. 2. You now can add and remove fields without cross dependencies, because you now use symbolic references; whereas, when you use the technique of putting window words directly in the window data structure, you have to account for changed offsets. ΓòÉΓòÉΓòÉ 1.1.11. Window Resources ΓòÉΓòÉΓòÉ Window resources are read-only data segments stored in an application's EXE file or in a dynamic link library's DLL file. Predefined PM window resources include keyboard accelerator tables, icons, menus, bit maps, dialog boxes, and so forth; these are not a regular part of the application window's code and data. Because, in most cases, window resources are not loaded into memory when the operating system runs a program, the resources can be shared by multiple instances of the same application. Most window resources are stored in a format that is unique to each resource type. The application does not need to know these formats because the system translates them, as necessary, for use in PM functions. The following table lists the ten most commonly used PM window resource types. Presentation Manager-Defined Resource Types ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéResource Identifier ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_ACCELTABLE ΓöéKeyboard accelerator table Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_BITMAP ΓöéBit map Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_DIALOG ΓöéDialog box template Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_FONT ΓöéFont Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_FONTDIR ΓöéFont directory Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_MENU ΓöéMenu template Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_MESSAGE ΓöéMessage string Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_POINTER ΓöéIcon or mouse Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_RCDATA ΓöéProgrammer-defined data Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRT_STRING ΓöéText string Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ To access these resources, you must prepare a resource file (ASCII file with the extension .RC). Then the ASCII resource file must be compiled into binary images using the resource compiler. The compiled resource file extension is RES; it can be linked into your program's EXE file or to a dynamic link library's DLL file. ΓòÉΓòÉΓòÉ 1.1.12. Maximized and Minimized Windows ΓòÉΓòÉΓòÉ A maximized window is a window that has been enlarged to fill the screen. Although a window's size can be set so that it fills the screen exactly, a maximized window is slightly different: the system automatically moves the window's title bar to the top of the screen and sets the WS_MAXIMIZED style for the window. A minimized window is a window whose size has been reduced to exactly the size of an icon or, in the workplace shell, it disappears altogether (by default). Like a maximized window, a minimized window is more than just a window of a given size; typically, the system moves the (icon) minimized window to the lower part of the screen and sets the WS_MINIMIZED style for that window. The lower part of the screen is sometimes called the icon area. Unless the application specifies another position, the system moves a minimized window into the first available icon position in the icon area. If a window is created with the WS_MAXIMIZED or WS_MINIMIZED styles, the system draws the window as a maximized or minimized window. An application can restore maximized or minimized windows to their previous size and position by specifying the SWP_RESTORE flag in a call to the WinSetWindowPos function. ΓòÉΓòÉΓòÉ 1.1.13. Window Visibility ΓòÉΓòÉΓòÉ A window that is a descendant of the desktop window can be either visible or invisible. The system displays a visible window on the screen. It hides an invisible window by not drawing it. If a window is visible, the user can supply input to the window and view the window's output. If a window is invisible, the window, in effect, is disabled. An invisible window can process messages from the system or from other windows, but it cannot process user input or display output. An application sets a window's visibility state when it creates the window. Later, a user or the application can change the visibility state. The visible region of a window is the position clipped by any overlapping windows. These overlapping windows can be child windows or other main windows in the system. The visible region is defined by a set of one or more rectangles, as shown in the following figure. ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé ΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé Γûæ A ΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæ ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæ Γöé B Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé C Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæ ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæ ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé ΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæ Γöé D Γöé Γöé ΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæΓûæ Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé ΓûæΓûæΓûæΓûæΓûæ Γöé - Visible region for Window A Γöé ΓûæΓûæΓûæΓûæΓûæ Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Visible Region for Window A A window is visible if the WS_VISIBLE style is set for the window. By default, the WinCreateWindow function creates invisible windows unless the application specifies WS_VISIBLE. The application often hides a window to keep its operational details from the user. For example, an application can keep a new window invisible while it customizes the window's appearance. An application can determine whether a window has the WS_VISIBLE style by using the WinIsWindowVisible function. Even if a window has the WS_VISIBLE style, the user might not be able to see the window on the screen because other windows completely overlap it, or it might have been moved beyond the edge of its parent. A visible window is subject to the clipping rules established by its parent-child relationship. If the window's parent window is not visible, the window will not be visible. Because a child window is drawn relative to its parent's lower-left corner, if the parent window is moved beyond the edge of the screen, the child window also will be moved. In other words, if a user moves the parent window containing the child window far enough off the edge of the screen, the user will not be able to see the child window, even though the child window and its parent window have the WS_VISIBLE style. To determine whether the user actually can see a window, an application can use the WinIsWindowShowing function. ΓòÉΓòÉΓòÉ 1.1.14. Window Destruction ΓòÉΓòÉΓòÉ In general, an application must destroy all the windows it creates. It does this by using the WinDestroyWindow function. When a window is destroyed, the system hides the window, if it is visible, and then removes any internal data associated with the window. This invalidates the window handle so that it can no longer be used by the application. An application destroys many of the windows it creates soon after creating them. For example, an application usually destroys a dialog window as soon as the application has sufficient input from the user to continue its task. An application eventually destroys the main window of the application (before terminating). Destroying a window does not affect the window class from which the window was created. New windows still can be created using that class, and any existing windows of that class continue to operate. When the application calls WinDestroyWindow, the system searches the descendancy tree for all windows below the specified window and destroys them from the bottom up, so each child receives WM_DESTROY before its parent. Each destroyed window is responsible for cleaning up its own resources in response to the WM_DESTROY message. If a presentation space was created by the WinGetPS function for any of the windows to be destroyed, it must be released by calling the WinReleasePS function. The application must do this before calling the WinDestroyWindow function. If a presentation space is associated with the device context for the window, the application must disassociate or destroy the presentation space by using the GpiAssociate or GpiDestroyPS function before calling WinDestroyWindow. Failing to release a resource can cause an error. For more information about presentation spaces and device contexts, see Painting and Drawing. If the window being destroyed is the active window, both the active and focus states are transferred to another window. The window that becomes the active window is the next window, as determined by the Alt+Esc key combination. The new active window then determines which window receives the keyboard focus. ΓòÉΓòÉΓòÉ 1.2. Using Windows ΓòÉΓòÉΓòÉ The following sections explain how to create and use windows in an application, how to manage ownership and parent-child window relationships, and how to move and size windows. ΓòÉΓòÉΓòÉ 1.2.1. Creating a Top-Level Frame Window ΓòÉΓòÉΓòÉ The main window in most applications is a top-level frame window. An application creates a top-level frame window by specifying the handle of the desktop window, or HWND_DESKTOP, as the hwndParent parameter in a call to the WinCreateStdWindow function. The following figure shows the main() function for a simple PM application. This function initializes the application, creates a message queue, and registers the window class for the client window before creating a top-level frame window. #define IDR_RESOURCES 1 MRESULT EXPENTRY ClientWndProc(HWND, ULONG, MPARAM, MPARAM); int main(VOID) { HWND hwndFrame; HWND hwndClient; HMQ hmq; QMSG qmsg; HAB hab; /* Set the frame-window creation flags. */ ULONG flFrameFlags = FCF_TITLEBAR | /* Title bar */ FCF_SIZEBORDER | /* Size border */ FCF_MINMAX | /* Minimize and maximize buttons. */ FCF_SYSMENU | /* System menu */ FCF_SHELLPOSITION | /* System-default size and position */ FCF_TASKLIST ; /* Add name to Task List. */ /* Initialize the application for PM */ hab = WinInitialize(0); /* Create the application message queue. */ hmq = WinCreateMsgQueue(hab, 0); /* Register the class for the client window. */ WinRegisterClass( hab, /* Anchor block handle */ "MyPrivateClass", /* Name of class being registered */ (PFNWP)ClientWndProc, /* Window procedure for class */ CS_SIZEREDRAW | /* Class style */ CS_HITTEST, /* Class style */ 0); /* Extra bytes to reserve */ /* Create a top-level frame window with a client window */ /* that belongs to the window class "MyPrivateClass". */ hwndFrame = WinCreateStdWindow( HWND_DESKTOP, /* Parent is desktop window. */ WS_VISIBLE, /* Make frame window visible. */ &flFrameFlags, /* Frame controls */ "MyPrivateClass", /* Window class for client */ NULL, /* No window title */ WS_VISIBLE, /* Make client window visible . */ (HMODULE) 0, /* Resources in application module */ IDR_RESOURCES, /* Resource identifier */ NULL); /* Pointer to client window handle */ /* Start the main message loop. Get messages from the */ /* queue and dispatch them to the appropriate windows. */ while (WinGetMsg(hab, &qmsg, 0, 0, 0)) WinDispatchMsg(hab, &qmsg); /* Main loop has terminated. Destroy all windows and the */ /* message queue; then terminate the application. */ WinDestroyWindow(hwndFrame); WinDestroyMsgQueue(hmq); WinTerminate(hab); return 0; } Structure of a Simple Presentation Manager Application ΓòÉΓòÉΓòÉ 1.2.2. Creating an Object Window ΓòÉΓòÉΓòÉ An application can create an object window by using the WinCreateWindow function and setting the desktop-object window as the parent window. The code fragment in the following figure shows how to create an object window. #define ID_OBJWINDOW 2 HWND hwndObject; hwndObject = WinCreateWindow( HWND_OBJECT, /* Parent is object window. */ "MyObjClass", /* Window class for client */ NULL, /* Window text */ 0, /* No styles for object window */ 0, 0, /* Lower-left corner */ 0, 0, /* Width and height */ NULL, /* No owner */ HWND_BOTTOM, /* Inserts window at bottom of z-order */ ID_OBJWINDOW, /* Window identifier */ NULL, /* No class-specific data */ NULL); /* No presentation data */ Creating an Object Window ΓòÉΓòÉΓòÉ 1.2.3. Querying Window Data ΓòÉΓòÉΓòÉ An application can examine the values in the data structure associated with a window by using the WinQueryWindowUShort and WinQueryWindowULong functions. Each of these functions specifies a structure data item to examine. The index value can be an integer representing a zero-based byte index or a constant (QWS_) that identifies a specific item of data. The code fragment in the following figure obtains the programmer-defined identifier of the object window defined in the previous example: HWND hwndObject; USHORT usObjID; usObjID = WinQueryWindowUShort(hwndObject, QWS_ID); Getting the Window Identifier ΓòÉΓòÉΓòÉ 1.2.4. Changing the Parent Window ΓòÉΓòÉΓòÉ An application can change a window's parent window by using the WinSetParent function. For example, in an application that uses child windows to display documents, you might want only the active document window to show a system menu. You can do this by changing that menu's parent window back and forth between the document window and the object window when WM_ACTIVATE messages are received. This technique is shown in the code fragment in the following figure. switch (msg) { case WM_ACTIVATE: { HWND hwndFrame, hwndSysMenu, hwnd; /* Get the handles of the frame window and system menu. */ hwndFrame = WinQueryWindow(hwnd, QW_PARENT); hwndSysMenu = WinWindowFromID(hwndFrame, FID_SYSMENU); /* If the window is being activated, make the frame window the */ /* parent of the system menu. Otherwise, hide the system menu */ /* by making the object window the parent. */ if ( SHORT1FROMMP(mp1)) WinSetParent(hwndSysMenu, hwndFrame, TRUE); else WinSetParent(hwndSysMenu, HWND_OBJECT, TRUE); } return 0; } Changing the Parent Window ΓòÉΓòÉΓòÉ 1.2.5. Finding a Parent, Child, or Owner Window ΓòÉΓòÉΓòÉ An application can determine the parent, child, and owner windows for any window by using the WinQueryWindow function. This function returns the window handle of the requested window. The code fragment in the following figure determines the parent window of the given window: HWND hwndParent; HWND hwndMyWindow; hwndParent = WinQueryWindow(hwndMyWindow, QW_PARENT); Finding the Parent Window The code fragment in the following figure determines the topmost child window (the child window in the top z-order position): HWND hwndTopChild; HWND hwndParent; hwndTopChild = WinQueryWindow(hwndParent, QW_TOP); Finding the Topmost Child Window If a given window does not have an owner or child window, WinQueryWindow returns NULL. ΓòÉΓòÉΓòÉ 1.2.6. Setting an Owner Window ΓòÉΓòÉΓòÉ An application can set the owner for a window by using the WinSetOwner function. Typically, after setting the owner, a window notifies the owner window of the new relationship by sending it a message. The code fragment in the following figure shows how to set the owner window and send it a message: #define NEW_OWNER 1 HWND hwndMyWindow; HWND hwndNewOwner; if (WinSetOwner(hwndMyWindow, hwndNewOwner)) /* Send a notification message. */ WinSendMsg(hwndNewOwner, /* Sends to owner */ WM_CONTROL, /* Control message for notification */ (MPARAM) NEW_OWNER, /* Notification code */ NULL); /* No extra data */ Setting the Owner Window A window can have only one owner, so WinSetOwner removes any previous owner. ΓòÉΓòÉΓòÉ 1.2.7. Retrieving the Handle of a Child or Owned Window ΓòÉΓòÉΓòÉ A parent or owner window can retrieve the handle of a child or owned window by using the WinWindowFromID function and supplying the identifier of the child or owned window. WinWindowFromID searches all child and owned windows to locate the window with the given identifier. The window identifier is set when the application creates the child or owned window. Typically, an owned window uses WinQueryWindow to get the handle of the owner window; then uses WinSendMsg to issue a notification message to its owner window. The code fragment in the following figure retrieves the window handle of an owner window and sends the window a WM_ENABLE message: HWND hwndOwned; HWND hwndOwner; case WM_CONTROL: switch (SHORT2FROMMP (mp2)) { case BN_CLICKED: hwndOwned = WinWindowFromID(hwndOwner, (ULONG)SHORT1FROMMP(mp1)); WinSendMsg(hwndOwned, WM_ENABLE, (MPARAM)TRUE, (MPARAM) NULL); return 0; . . /* Check for other notification codes. */ . } Getting a Handle to an Owner or Child Window An application also can retrieve the handle of a child window by using the WinWindowFromPoint function and supplying a point in the corresponding parent window. ΓòÉΓòÉΓòÉ 1.2.8. Enumerating Top-Level Windows ΓòÉΓòÉΓòÉ An application can enumerate all top-level windows in the system by using the WinBeginEnumWindows and WinGetNextWindow functions. An application also can create a list of all child windows for a given parent window using WinBeginEnumWindows. This list contains the window handles of immediate child windows. By using WinGetNextWindow, the application then can retrieve the window handles, one at a time, from the list. When the application has finished using the list, it must release the list with the WinEndEnumWindows function. The code fragment in the following figure shows how to enumerate all top-level windows (all immediate child windows of the desktop window): HWND hwndTop; HENUM henum; /* Enumerate all top-level windows. */ henum = WinBeginEnumWindows(HWND_DESKTOP); /* Loop through all enumerated windows. */ while (hwndTop = WinGetNextWindow(henum)) { . . /* Perform desired task on each window. */ . } WinEndEnumWindows(henum); Enumerating Top-Level Windows ΓòÉΓòÉΓòÉ 1.2.9. Moving and Sizing a Window ΓòÉΓòÉΓòÉ An application can move a window by using the WinSetWindowPos function and specifying the SWP_MOVE constant. The function changes the position of the window to the specified position. The position is always given in coordinates relative to the parent window. The code fragment in the following figure moves the window to the position (10,10): HWND hwnd; WinSetWindowPos( hwnd, /* Window handle */ NULL, /* Not used for moving and sizing */ 10, 10, /* New position */ 0, 0, /* Not used for moving */ SWP_MOVE); /* Move window */ Moving a Window An application can set the size of a window by using the WinSetWindowPos function and specifying the SWP_SIZE constant. WinSetWindowPos changes the width and height of the window to the specified width and height. An application can combine moving and sizing in a single function call, as shown in the following figure. HWND hwnd; WinSetWindowPos( hwnd, /* Window handle */ NULL, /* Not used for moving and sizing */ 10, 10, /* New position */ 200, 200, /* Width and height */ SWP_MOVE | SWP_SIZE); /* Move and size window. */ Moving and Sizing a Window An application can retrieve the current size and position of a window by using the WinQueryWindowPos function. This function copies the current information to an SWP structure. The code fragment in the following figure uses the current size and position to change the height of the window, leaving the width and position unchanged: HWND hwnd; SWP swp; WinQueryWindowPos(hwnd, &swp); WinSetWindowPos( hwnd, /* Window handle */ NULL, /* Not used for moving and sizing */ 0, 0, /* Not used for sizing */ swp.cx, /* Current width */ swp.cy + 200, /* New height */ SWP_SIZE); /* Change the size. */ Changing the Size of a Window An application also can move and change the size of several windows at once by using the WinSetMultWindowPos function. This function takes an array of SWP structures. Each structure specifies the window to be moved or changed. An application can move and size a window even if it is not visible, although the user is not able to see the effects of the moving and sizing until the window is visible. ΓòÉΓòÉΓòÉ 1.2.10. Redrawing Windows ΓòÉΓòÉΓòÉ When the system moves a window or changes its size, it can invalidate all or part of that window. The system attempts to preserve the contents of the window and copy them to the new position; but if the window's size is increased, the window must fill the area exposed by the size change. If a window is moved from behind an overlapping window, any area formerly obscured by the other window must be drawn. In these cases, the system invalidates the exposed areas and sends a WM_PAINT message to the window. An application can require that the system invalidate an entire window every time the window moves or changes size. To do this, the application sets the CS_SIZEREDRAW class style in the corresponding window class. Typically, this class style is selected for use in an application that uses a window's current size and position to determine how to draw the window. For example, a clock application always would draw the face of the clock so that it filled the window exactly. An application also can explicitly specify which parts of the window to preserve during a move or size change. Before any change is made, the system sends a WM_CALCVALIDRECTS message to windows that do not have the style CS_SIZEREDRAW. This enables the window procedure to specify what part of the window to save and where to align it after the move or size change. ΓòÉΓòÉΓòÉ 1.2.11. Changing the Z-Order of Windows ΓòÉΓòÉΓòÉ An application can move a window to the top or bottom of the z-order by passing the SWP_ZORDER constant to the WinSetWindowPos function. An application specifies where to move the window by specifying the HWND_TOP or HWND_BOTTOM constants. The code fragment in the following figure uses WinSetWindowPos to change the z-order of a window: HWND hwndParent; HWND hwndNext; HENUM henum; WinSetWindowPos( hwndNext, /* Next window to move */ HWND_TOP, /* Put window on top */ 0, 0, 0, 0, /* Not used for z-order */ SWP_ZORDER); /* Change z-order */ Changing the Z-order of a Window An application also can specify the window that the given window is to move behind. In this case, the application specifies the window handle instead of the HWND_TOP or HWND_BOTTOM constant. HWND hwndParent; HWND hwndNext; HWND hwndExchange; HENUM henum; henum = WinBeginEnumWindows(hwndParent); hwndExchange = WinGetNextWindow(henum); /* hwndNext has top window; hwndExchange has window under the top. */ WinSetWindowPos( hwndNext, /* Next window to move */ hwndExchange, /* Put lower window on top */ 0, 0, 0, 0, /* Not used for z-order */ SWP_ZORDER); /* Change z-order */ WinEndEnumWindows(henum); Exchanging the Z-order of Windows ΓòÉΓòÉΓòÉ 1.2.12. Showing or Hiding a Window ΓòÉΓòÉΓòÉ An application can show or hide a window by using the WinShowWindow function. This function changes the WS_VISIBLE style of a window to the specified setting. An application can also use the WinIsWindowVisible function to check the visibility of a window. This function returns TRUE if the window is visible. ΓòÉΓòÉΓòÉ 1.2.13. Maximizing, Minimizing, and Restoring a Frame Window ΓòÉΓòÉΓòÉ An application can maximize, minimize, or restore a frame window by using the WinSetWindowPos function and specifying the constant SWP_MAXIMIZE, SWP_MINIMIZE, or SWP_RESTORE. Only a frame window can maximize and minimize by default. For any other window, an application must provide support for these actions in the corresponding window procedure. The following figure shows how to maximize a frame window: SWP swpCurrent; HWND hwndFrame; WinQueryWindowPos(hwndFrame, &swpCurrent); WinSetWindowPos( hwndFrame, /* Window handle */ NULL, /* Not used to maximize */ swpCurrent.x, swpCurrent.y, /* Stored for restoring window */ swpCurrent.cx, swpCurrent.cy, /* Stored for restoring window */ SWP_MAXIMIZE | SWP_SIZE | SWP_MOVE); /* Maximize */ Maximizing a Frame Window ΓòÉΓòÉΓòÉ 1.2.14. Destroying a Window ΓòÉΓòÉΓòÉ An application can destroy a window by using the WinDestroyWindow function. The following figure shows how to create and then destroy a control window: HWND hwndCtrl; HWND hwndParent; hwndCtrl = WinCreateWindow(hwndParent, WC_BUTTON, ...); WinDestroyWindow(hwndCtrl); Destroying a Window ΓòÉΓòÉΓòÉ 1.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions, messages, and data structures used with windows. Window Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéWindow Creation Γöé Γöé ΓöéFunctions Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateWindow ΓöéThe most direct way of creating a Γöé Γöé Γöéwindow. The window is of class Γöé Γöé ΓöéClassName and returns hwnd. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateStdWindow ΓöéCreates a main window. Requires an Γöé Γöé Γöéanchor block. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWindow Destruction Γöé Γöé ΓöéFunctions Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDestroyWindow ΓöéDestroys a window and its child Γöé Γöé Γöéwindows, and releases all their Γöé Γöé Γöéresources. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWindow Data Functions Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowUShort ΓöéObtains the unsigned short integer Γöé Γöé Γöévalue of a given window at a Γöé Γöé Γöéspecified offset from the reserved Γöé Γöé Γöéwindow word's memory. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowUShort ΓöéSets an unsigned, short integer Γöé Γöé Γöévalue into the memory of the Γöé Γöé Γöéreserved window words. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowULong ΓöéObtains the unsigned long integer Γöé Γöé Γöévalue of a given window, at a Γöé Γöé Γöéspecified offset, from the memory ofΓöé Γöé Γöéa reserved window word. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowULong ΓöéSets an unsigned, long integer valueΓöé Γöé Γöéinto the memory of the reserved Γöé Γöé Γöéwindow words. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowPtr ΓöéRetrieves a pointer value from the Γöé Γöé Γöémemory of the reserved window word. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowPtr ΓöéSets a pointer value into the memoryΓöé Γöé Γöéof the reserved window words. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowBits ΓöéSets a number of bits into the Γöé Γöé Γöémemory of the reserved window words.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWindow Relationship Γöé Γöé ΓöéFunctions Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetParent ΓöéSets the parent for hwnd to Γöé Γöé ΓöéNewParent. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindow ΓöéReturns the handle of a window that Γöé Γöé Γöéhas a specified relationship to a Γöé Γöé Γöéspecified window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetOwner ΓöéChanges the owner of a specified Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinBeginEnumWindows ΓöéBegins the enumeration process for Γöé Γöé Γöéall the immediate child windows of aΓöé Γöé Γöéspecified window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinGetNextWindow ΓöéGets the window handle of the next Γöé Γöé Γöéwindow in a specified enumeration Γöé Γöé Γöélist. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinEndEnumWindows ΓöéEnds the specified enumeration Γöé Γöé Γöéprocess. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinIsChild ΓöéTests to determine whether one Γöé Γöé Γöéwindow is a descendant of another. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryDesktopWindow ΓöéReturns the desktop window handle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryObjectWindow ΓöéReturns the desktop-object window Γöé Γöé Γöéhandle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWindowFromID ΓöéReturns the handle of the child Γöé Γöé Γöéwindow with the specified ID. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWindowFromPoint ΓöéFinds the window, below a specified Γöé Γöé Γöépoint, that is a descendant of a Γöé Γöé Γöéspecified window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinMultWindowFromIDs ΓöéFinds the handles of child windows Γöé Γöé Γöéthat belong to a specified window Γöé Γöé Γöéand that have window IDs within a Γöé Γöé Γöéspecified range. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWindow Size and PositionΓöé Γöé ΓöéFunctions Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowPos ΓöéFacilitates the general positioning Γöé Γöé Γöéof a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowPos ΓöéObtains the size and position of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetMultWindowPos ΓöéAn efficient means of repositioning Γöé Γöé Γöémultiple windows with one call, Γöé Γöé Γöéprovided all windows being Γöé Γöé Γöépositioned have the same parent. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowRect ΓöéReturns a window rectangle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinGetMinPosition ΓöéReturns the position to which a Γöé Γöé Γöéwindow is minimized. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWindow Visibility Γöé Γöé ΓöéFunctions Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinIsWindowShowing ΓöéDetermines whether any part of the Γöé Γöé Γöéwindow, hwnd, is physically visible.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinShowWindow ΓöéSets the visibility state of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinIsWindowVisible ΓöéReturns the visibility state of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWindow Input Functions Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryActiveWindow ΓöéReturns the active window for Γöé Γöé ΓöéHWND_DESKTOP or other parent window.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetActiveWindow ΓöéSets the main window as the active Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryFocus ΓöéReturns the focus window; NULL if Γöé Γöé Γöéthere is no focus window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetFocus ΓöéSets the focus window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQuerySysModalWindow ΓöéReturns the current system-modal Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinRequestMutexSem ΓöéRequests the ownership of a mutex Γöé Γöé Γöésemaphore or waits for a PM message.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetSysModalWindow ΓöéEither sets a system-modal window orΓöé Γöé Γöéends the system-modal state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinStartApp ΓöéStarts an application. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinTerminate ΓöéTerminates an application thread's Γöé Γöé Γöéuse of PM and releases all of its Γöé Γöé Γöéassociated resources. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinTerminateApp ΓöéTerminates an application started Γöé Γöé Γöéwith WinStartApp. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWaitEventSem ΓöéWaits for an event semaphore to be Γöé Γöé Γöéposted or for a PM message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWaitMuxWaitSem ΓöéWaits for a muxwait semaphore to Γöé Γöé Γöéclear or for a PM message. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Window Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ACTIVATE ΓöéSent to a window as it gains Γöé Γöé Γöéor loses activation. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ADJUSTWINDOWPOS ΓöéSent to adjust a window's Γöé Γöé Γöéposition. Not sent if Γöé Γöé ΓöéSWP_NOADJUST is specified. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CALCFRAMERECT ΓöéOccurs when an application Γöé Γöé Γöéuses the WinCalcFrameRect Γöé Γöé Γöécall. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CALCVALIDRECTS ΓöéSent from WinSetWindowPos and Γöé Γöé ΓöéWinSetMultWindowPos to Γöé Γöé Γöédetermine which areas of a Γöé Γöé Γöéwindow will be preserved if a Γöé Γöé Γöéwindow is sized and which Γöé Γöé Γöéshould be redisplayed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CLOSE ΓöéSent to a frame window to Γöé Γöé Γöéindicate that the window is Γöé Γöé Γöébeing closed by the user. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéOccurs when the application Γöé Γöé Γöérequests creation of a window.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéOccurs when the application Γöé Γöé Γöérequests destruction of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéSets the enable state of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOVE ΓöéOccurs when a window with the Γöé Γöé Γöéstyle CS_MOVENOTIFY changes Γöé Γöé Γöéits absolute position. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéOccurs when a window needs Γöé Γöé Γöérepainting. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application Γöé Γöé Γöéqueries the window parameters.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application Γöé Γöé Γöésets or changes the window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SHOW ΓöéOccurs when a window's Γöé Γöé ΓöéWS_VISIBLE state is being Γöé Γöé Γöéchanged. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SIZE ΓöéOccurs when a window changes Γöé Γöé Γöéits size. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_WINDOWPOSCHANGED ΓöéSent to the window procedure Γöé Γöé Γöéof the window whose position Γöé Γöé Γöéis changed. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Window Data Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéData Structure ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCREATESTRUC ΓöéCreate window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWNDPARAMS ΓöéWindow parameters. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 2. Messages and Message Queues ΓòÉΓòÉΓòÉ The OS/2 operating system uses messages and message queues to communicate with applications and the windows belonging to those applications. This chapter explains how to create and use messages and message queues in PM applications. ΓòÉΓòÉΓòÉ 2.1. About Messages and Message Queues ΓòÉΓòÉΓòÉ Unlike traditional applications that take complete control of the computer's keyboard, mouse, and screen, PM applications must share these resources with other applications that are running at the same time. All applications run independently and rely on the operating system to help them manage shared resources. The operating system does this by controlling the operation of each application, communicating with each application when there is keyboard or mouse input or when an application must move and size its windows. ΓòÉΓòÉΓòÉ 2.1.1. Messages ΓòÉΓòÉΓòÉ A message is information, a request for information, or a request for an action to be carried out by a window in an application. The operating system, or an application, sends or posts a message to a window so that the window can use the information or respond to the request. There are three types of messages: o User-initiated o Application-initiated o System-initiated. A user-initiated message is the direct result of a user action, such as selecting a menu item or pressing a key. An application-initiated message is generated by one window in the application to communicate with another window. System-initiated messages are generated by the interface as the indirect result of a user action (for example, resizing a window) or as the direct result of a system event (such as creating a window). A message that requires an immediate response from a window is sent directly to the window by passing the message data as arguments to the window procedure. The window procedure carries out the request or lets the operating system carry out default processing for the message. A message that does not require an immediate response from a window is posted (the message data is copied) to the application's message queue. The message queue is a storage area that the application creates to receive and hold its posted messages. Then, the application can retrieve a message at the appropriate time, sending it to the addressed window for processing. Every message contains a message identifier, which is a 16-bit integer that indicates the purpose of the message. When a window processes a message, it uses the message identifier to determine what to do. Every message contains a window handle, which identifies the window the message is for. The window handle is important because most message queues and window procedures serve more than one window. The window handle ensures that the application forwards the message to the proper window. A message contains two message parameters-32-bit values that specify data or the location of data that a window uses when processing the message. The meaning and value of a message parameter depend on the message. A message parameter can contain an integer, packed bit flags, a pointer to a structure that contains additional data, and so forth. Some messages do not use message parameters and, typically, set the parameters to NULL. An application always checks the message identifier to determine how to interpret the message parameters. A queue message is a QMSG data structure that contains six data items, representing the window handle, message identifier, two message parameters, message time, and mouse-pointer position. The time and position are included because most queue messages are input messages, representing keyboard or mouse input from the user. The time and position also help the application identify the context of the message. The operating system posts a queue message by filling the QMSG structure and copying it to a message queue. A window message consists of the window handle, the message identifier, and two message parameters. A window message does not include the message time and mouse-pointer position, because most window messages are requests to perform a task that is not related to the current time or mouse-pointer position. The operating system sends a window message by passing these values, as individual arguments, to a window procedure. ΓòÉΓòÉΓòÉ 2.1.2. Message Queues ΓòÉΓòÉΓòÉ Every PM application must have a message queue. A message queue is the only means an application has to receive input from the keyboard or mouse. Only applications that create message queues can create windows. An application creates a message queue by using the WinCreateMsgQueue function. This function returns a handle that the application can use to access the message queue. After an application creates a message queue, the system posts messages intended for windows in the application to that queue. The application can retrieve queue messages by specifying the message-queue handle in the WinGetMsg function. It also can examine messages, without retrieving them, by using the WinPeekMsg function. When an application no longer needs the message queue, it can destroy the queue by using the WinDestroyMsgQueue function. One message queue serves all the windows in a thread. This means a queue can hold messages for several windows. A message specifies the handle of the window to which it belongs so the application can forward a message easily to the appropriate window. The message loop recognizes a NULL window handle and the message is processed within the message loop rather than passed to WinDispatchMessage. See the following figure for an example of an input-message processing loop. An application that has more than one thread can create more than one message queue. The system allows one message queue for each thread. A message queue created by a thread belongs to that thread and has no connection to other queues in the application. When an application creates a window in a given thread, the system associates the window with the message queue in that thread. The system then posts all subsequent messages intended for that window to that queue. Note: The recommended way to structure PM applications is to have at least two threads and two message queues. The first thread and message queue control all the user-interface windows, and the second thread and message queue control all the object windows. Several windows can use one message queue; it is important that the message queue be large enough to hold all messages that possibly can be posted to it. An application can set the size of the message queue when it creates the queue by specifying the maximum number of messages the queue can hold. The default maximum number of messages is 10. To minimize queue size, several types of posted messages are not actually stored in a message queue. Instead, the operating system keeps a record in the queue of the message being posted and combines any information contained in the message with information from previous messages. Timer, semaphore, and paint messages are handled this way. For example, if more than one WM_PAINT message is posted, the operating system combines the update regions for each into a single update region. Although there is no actual WM_PAINT message in the queue, the operating system constructs one WM_PAINT message with the single update region when an application uses the WinGetMsg function. The operating system handles mouse and keyboard input messages differently from the way it handles other types of messages. The operating system receives all keyboard and mouse events, such as keystrokes and mouse movements, into the system message queue. The operating system converts these events into messages and posts them, one at a time, to the appropriate application message queue. The application retrieves the messages from its queue and dispatches them to the appropriate window, which processes the messages. The operating system message queue usually is large enough to hold all input messages, even if the user types or moves the mouse very quickly. If the operating system message queue does run out of space, the system ignores the most recent keyboard input (usually by beeping to indicate the input is ignored) and collects mouse motions into a WM_MOUSEMOVE message. Every message queue has a corresponding MQINFO data structure that specifies the identifiers of the process and thread that own the message queue and gives a count of the maximum number of messages the queue can receive. An application can retrieve the structure by using the WinQueryQueueInfo function. A message queue also has a current status that indicates the types of messages currently in the queue. An application can retrieve the queue status by using the WinQueryQueueStatus function. An application also can use the WinPeekMsg function to examine the contents of a message queue. WinPeekMsg checks for a specific message or range of messages in the queue and gives the application the option of removing messages from the queue. An application can call the WinQueryQueueStatus function to determine the contents of the queue before calling the WinPeekMsg or WinGetMsg function to remove a message from the queue. ΓòÉΓòÉΓòÉ 2.1.3. Message Handling ΓòÉΓòÉΓòÉ To handle and process messages, an application can use a message loop and the window procedure. These terms are explained in the following two sections. ΓòÉΓòÉΓòÉ 2.1.3.1. Message Loops ΓòÉΓòÉΓòÉ Every application with a message queue is responsible for retrieving the messages from that queue. An application can do this by using a message loop, usually in the application's main function, that retrieves messages from the message queue and dispatches them to the appropriate windows. The message loop consists of two calls: one to the WinGetMsg function; the other to the WinDispatchMsg function. The message loop has the following form: HAB hab; QMSG qmsg; while (WinGetMsg(hab, &qmsg, NULL, 0, 0)) WinDispatchMsg(hab, &qmsg); An application starts the message loop after creating the message queue and at least one application window. Once started, the message loop continues to retrieve messages from the message queue and to dispatch (send) them to the appropriate windows. WinDispatchMsg sends each message to the window specified by the window handle in the message. The following figure illustrates the typical routing of an input message through the operating system's and application's message loops. Mouse ΓöÇΓöÇΓöÇΓöÉ ΓöîΓöÇΓöÇΓöÇ Keystrokes ΓöîΓöÇΓö┤ΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÉ Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ System Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Event (time ordered) Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Queue ΓööΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÿ Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÉ Γöé Input Γöé Scancode ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Router Γöé Translation Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Message Γöé Accelerator Γöé Preprocessor Γöé Key Translation ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓöîΓöÇ ΓöÇΓöÇ ΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÉ ΓöîΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÉ Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Appl Priority Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ MssgQ Ordered Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé ΓööΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÿ Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ Γöé Γöé ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇWinGetMsgQ Γöé WinDispatchMsg Γöé Γöé Γöé Γöé App's Γöé Γöé Message Γöé Window Procedure Γöé Loop Γöé Γöé Γöé Γöé Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇreturn; ΓööΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÇ ΓöÇΓöÿ Input Message Processing Loop Only one message loop is needed for a message queue, even if the queue contains messages for more than one window. Each queue message is a QMSG structure that contains the handle of the window to which the message belongs. WinDispatchMsg always dispatches the message to the proper window. WinGetMsg retrieves messages from the queue in first-in, first-out (FIFO) order, so the messages are dispatched to windows in the same order they are received. If there are no messages in the queue, the operating system temporarily stops processing the WinGetMsg function until a message arrives. This means that CPU time that, otherwise, would be spent waiting for a message can be given to the applications (or threads) that do have messages in their queues. The message loop continues to retrieve and dispatch messages until WinGetMsg retrieves a WM_QUIT message. This message causes the function to return FALSE, terminating the loop. In most cases, terminating the message loop is the first step in terminating the application. An application can terminate its own loop by posting the WM_QUIT message in its own queue. An application can modify its message loop in a variety of ways. For example, it can retrieve messages from the queue without dispatching them to a window. This is useful for applications that post messages without specifying a window. (These messages apply to the application rather than a specific window; they have NULL window handles.) Also, an application can direct the WinGetMsg function to search for specific messages, leaving other messages in the queue. This is useful for applications that temporarily need to bypass the usual FIFO order of the message queue. ΓòÉΓòÉΓòÉ 2.1.3.2. Window Procedures ΓòÉΓòÉΓòÉ A window procedure is a function that receives and processes all input and requests for action sent to the windows. Every window class has a window procedure; every window created using that class uses that window procedure to respond to messages. The system sends a message to the window procedure by passing the message data as arguments. The window procedure takes the appropriate action for the given message. Most window procedures check the message identifier, then use the information specified by the message parameters to carry out the request. When it has completed processing the message, the window procedure returns a message result. Each message has a particular set of possible return values. The window procedure must return the appropriate value for the processing it performed. A window procedure cannot ignore a message. If it does not process a message, it must pass the message back to the operating system for default processing. The window procedure does this by calling the WinDefWindowProc function to carry out a default action and return the message result. Then, the window procedure must return this value as its own message result. A window procedure commonly processes messages for several windows. It uses the window handle specified in the message to identify the appropriate window. Most window procedures process just a few types of messages and pass the others on to the operating system by calling WinDefWindowProc. ΓòÉΓòÉΓòÉ 2.1.4. Posting and Sending Messages ΓòÉΓòÉΓòÉ Any application can post and send messages. Like the operating system, an application posts a message by copying it to a message queue. It sends a message by passing the message data as arguments to a window procedure. To post and send messages, an application uses the WinPostMsg and WinSendMsg functions. An application posts a message to notify a specific window to perform a task. The WinPostMsg function creates a QMSG structure for the message and copies the message to the message queue corresponding to the given window. The application's message loop eventually retrieves the message and dispatches it to the appropriate window procedure. For example, one message commonly posted is WM_QUIT. This message terminates the application by terminating the message loop. An application sends a message to cause a specific window procedure to carry out a task immediately. The WinSendMsg function passes the message to the window procedure corresponding to the given window. The function waits until the window procedure completes processing and then returns the message result. Parent and child windows often communicate by sending messages to each other. For example, a parent window that has an entry-field control as its child window can set the text of the control by sending a message to the child window. The control can notify the parent window of changes to the text (carried out by the user) by sending messages back to the parent window. Occasionally, an application might need to send or post a message to all windows in the system. For example, if the application changes a system value, it must notify all windows about the change by sending a WM_SYSVALUECHANGED message. An application can send or post messages to any number of windows by using the WinBroadcastMsg function. The options in WinBroadcastMsg determine whether the message is sent or posted and specify the windows that will receive the message. Any thread in the application can post a message to a message queue, even if the thread has no message queue of its own. However, only a thread that has a message queue can send a message. Sending a message between threads is relatively uncommon. For one reason, sending a message is costly in terms of system performance. If an application posts a message between threads, it is likely to be a semaphore message, which permits window procedures to manage a shared resource jointly. An application can post a message without specifying a window. If the application supplies a NULL window handle when it calls the WinPostMsg function, the function posts the message to the queue associated with the current thread. The application must process the message in the message loop. This is one way to create a message that applies to the entire application instead of to a specific window. A window procedure can determine whether it is processing a message sent by another thread by using the WinInSendMsg function. This is useful when message processing depends on the origin of the message. A common programming error is to assume that the WinPostMsg function always succeeds. It fails when the message queue is full. An application should check the return value of the WinPostMsg function to see whether the message was posted. In general, if an application intends to post many messages to the queue, it should set the message queue to an appropriate size when it creates the queue. The default message-queue size is 10 messages. ΓòÉΓòÉΓòÉ 2.1.5. Message Types ΓòÉΓòÉΓòÉ This section describes the three types of OS/2 messages: o System-defined o Application-defined o Semaphore. ΓòÉΓòÉΓòÉ 2.1.5.1. System-Defined Messages ΓòÉΓòÉΓòÉ There are many system-defined messages that are used to control the operations of applications and to provide input and other information for applications to process. The system sends or posts a system-defined message when it communicates with an application. An application also can send or post system-defined messages. Usually, applications use these messages to control the operation of control windows created by using preregistered window classes. Each system message has a unique message identifier and a corresponding symbolic constant. The symbolic constant, defined in the system header files, states the purpose of the message. For example, the WM_PAINT constant represents the paint message, which requests that a window paint its contents. The symbolic constants also specify the message category. System-defined messages can belong to several categories; the prefix identifies the type of window that can interpret and process the messages. The following table lists the prefixes and their related message categories: Message Categories ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéPrefix ΓöéMessage category Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_ ΓöéNotebook control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_ ΓöéButton control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBM_ ΓöéCombination-box control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_ ΓöéContainer control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_ ΓöéEntry-field control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_ ΓöéList-box control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_ ΓöéMultiple-line entry field control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_ ΓöéMenu control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBM_ ΓöéScroll-bar control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_ ΓöéSlider control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSM_ ΓöéStatic control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTBM_ ΓöéTitle-bar control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_ ΓöéValue set control Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ ΓöéGeneral window Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ General window messages cover a wide range of information and requests, including: o Mouse and keyboard-input o Menu- and dialog-input o Window creation and management o Dynamic data exchange (DDE). ΓòÉΓòÉΓòÉ 2.1.5.2. Application-Defined Messages ΓòÉΓòÉΓòÉ An application can create messages to use in its own windows. If an application does create messages, the window procedure that receives the messages must interpret them and provide the appropriate processing. The operating system reserves the message-identifier values in the range 0x0000 through 0x0FFF (the value of WM_USER - 1) for system-defined messages. Applications cannot use these values for their private messages. Values in the range 0x1000 (the value of WM_USER) through 0xBFFF, however, are available for message identifiers, defined by an application, for use in that application. Warning: It is very important that applications do not broadcast messages in the 0x1000 through 0xBFFF range because of the risk of misinterpretation by other applications. Values in the range 0xC000 through 0xFFFF are reserved for message identifiers that an application defines and registers with the system atom table; these can be used in any application. Values above 0xFFFF (0x00010000 through 0xFFFFFFFF) are reserved for future use; applications must not use messages in this range. ΓòÉΓòÉΓòÉ 2.1.5.3. Semaphore Messages ΓòÉΓòÉΓòÉ A semaphore message provides a way of signaling, through the message queue, the end of an event. An application uses a semaphore message the same way it uses system semaphore functions-to coordinate events by passing signals. A semaphore message often is used in conjunction with system semaphores. There are four semaphore messages: WM_SEM1 WM_SEM2 WM_SEM3 WM_SEM4. An application posts one of these messages to signal the end of a given event. The window that is waiting for the given event receives the semaphore message when the message loop retrieves and dispatches the message. Each semaphore message includes a bit flag that an application can use to uniquely identify the 32 possible semaphores for each semaphore message. The application passes the bit flag (with the appropriate bit set) as a message parameter with the message. The window procedure that receives the message then uses the bit flag to identify the semaphore. To save space, the system does not store semaphore messages in the message queue. Instead, it sets a record in the queue, indicating that the semaphore message has been received, and then combines the bit flag for the message with the bit flags from previous messages. When the window procedure eventually receives the message, the bit flag specifies each semaphore message posted since the last message was retrieved. ΓòÉΓòÉΓòÉ 2.1.6. Message Priorities ΓòÉΓòÉΓòÉ The WinGetMsg function retrieves messages from the message queue based on message priority. WinGetMsg retrieves messages with higher priority first. If it finds more than one message at a particular priority level, it retrieves the oldest message first. Messages have the following priorities: Message Priorities ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéPriority ΓöéMessage Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé1 ΓöéWM_SEM1 Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé2 ΓöéMessages posted using WinPostMsg Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé3 ΓöéInput messages from the keyboard or mouse Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé4 ΓöéWM_SEM2 Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé5 ΓöéWM_PAINT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé6 ΓöéWM_SEM3 Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé7 ΓöéWM_TIMER Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé8 ΓöéWM_SEM4 Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 2.1.7. Message Filtering ΓòÉΓòÉΓòÉ An application can choose specific messages to retrieve from the message queue (and ignore other messages) by specifying a message filter with the WinGetMsg or WinPeekMsg functions. The message filter is a range of message identifiers (specified by a first and last identifier), a window handle, or both. The WinGetMsg and WinPeekMsg functions use the message filter to select the messages to retrieve from the queue. Message filtering is useful if an application needs to search ahead in the message queue for messages that have a lower priority or that arrived in the queue later than other less important messages. Any application that filters messages must ensure that a message satisfying the message filter can be posted. For example, filtering for a WM_CHAR message in a window that does not receive keyboard input prevents the WinGetMsg function from returning. Some messages, such as WM_COMMAND, are generated from other messages; filtering for them also can prevent WinGetMsg from returning. To filter for mouse, button, and DDE messages, an application can use the following constants: WM_MOUSEFIRST and WM_MOUSELAST WM_BUTTONCLICKFIRST and WM_BUTTONCLICKLAST WM_DDE_FIRST and WM_DDE_LAST. ΓòÉΓòÉΓòÉ 2.2. Using Messages ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Create a message queue and message loop. o Examine the message queue. o Post and send messages between windows. o Broadcast a message to multiple windows. o Use message macros. ΓòÉΓòÉΓòÉ 2.2.1. Creating a Message Queue and Message Loop ΓòÉΓòÉΓòÉ An application needs a message queue and message loop to process messages for its windows. An application creates a message queue by using the WinCreateMsgQueue function. An application creates a message loop by using the WinGetMsg and WinDispatchMsg functions. The application must create and show at least one window after creating the queue but before starting the message loop. The following code fragment shows how to create a message queue and message loop: CreatingaMessageQueueandMessageLoop MRESULT EXPENTRY ClientWndProc(HWND hwnd,ULONG msg,MPARAM mp1,MPARAM mp2); HAB hab; int main(VOID) { HMQ hmq; QMSG qmsg; HWND hwndFrame, hwndClient; ULONG flFrameFlags = FCF_TITLEBAR | FCF_SYSMENU | FCF_SIZEBORDER | FCF_MINMAX | FCF_SHELLPOSITION | FCF_TASKLIST; /* Initialize the application for Presentation Manager interface. */ hab = WinInitialize(0); /* Create the application message queue. */ hmq = WinCreateMsgQueue(hab, 0); /* Register the window class for your client window. */ WinRegisterClass(hab, /* Anchor block handle */ "MyClientClass", /* Class name */ (PFNWP) ClientWndProc,/* Window procedure */ CS_SIZEREDRAW, /* Class style */ 0); /* Extra bytes to reserve */ /* Create a main window. */ hwndFrame = WinCreateStdWindow( HWND_DESKTOP, /* Parent window handle */ WS_VISIBLE, /* Style of frame window */ &flFrameFlags, /* Frame controls */ "MyClientClass", /* Window class for client */ (PSZ) NULL, /* No title-bar text */ WS_VISIBLE, /* Style of client window */ (HMODULE) NULL, /* Module handle for resources */ 0, /* No resource identifier */ &hwndClient); /* Pointer to client handle */ /* Start the message loop. */ while (WinGetMsg(hab, &qmsg, (HWND) NULL, 0, 0)) WinDispatchMsg(hab, &qmsg); /*. Destroy the main window. */ WinDestroyWindow(hwndFrame); /* Destroy the message queue. */ WinDestroyMsgQueue(hmq); /* Terminate the application. */ WinTerminate(hab); } Both the WinGetMsg and WinDispatchMsg functions take a pointer to a QMSG structure as a parameter. If a message is available, WinGetMsg copies it to the QMSG structure; WinDispatchMsg then uses the data in the structure as arguments for the window procedure. Occasionally, an application might need to process a message before dispatching it. For example, if a message is posted but the destination window is not specified (that is, the message contains a NULL window handle), the application must process the message to determine which window should receive the message. Then the WinDispatchMsg function can forward the message to the proper window. The following code fragment shows how the message loop can process messages that have NULL window handles: HAB hab; QMSG qmsg; while (WinGetMsg (hab, &qmsg, (HWND) NULL, 0, 0)) { if (qmsg.hwnd == NULL) { . . /* Process the message. */ . } else WinDispatchMsg (hab, &qmsg); } ΓòÉΓòÉΓòÉ 2.2.2. Examining the Message Queue ΓòÉΓòÉΓòÉ An application can examine the contents of the message queue by using the WinPeekMsg or WinQueryQueueStatus function. It is useful to examine the queue if the application starts a lengthy operation that additional user input might affect, or if the application needs to look ahead in the queue to anticipate a response to user input. An application can use WinPeekMsg to check for specific messages in the message queue. This function is useful for extracting messages for a specific window from the queue. It returns immediately if there is no message in the queue. An application can use WinPeekMsg in a loop without requiring the loop to wait for a message to arrive. The following code fragment checks the queue for WM_CHAR messages: HAB hab; QMSG qmsg; if (WinPeekMsg(hab, &qmsg, (HWND) NULL, WM_CHAR, WM_CHAR, PM_NOREMOVE)){ . . /* Process the message. */ . } An application also can use the WinQueryQueueStatus function to check for messages in the queue. This function is very fast and returns information about the kinds of messages available in the queue and which messages have been posted recently. Most applications use this function in message loops that need to be as fast as possible. ΓòÉΓòÉΓòÉ 2.2.3. Posting a Message to a Window ΓòÉΓòÉΓòÉ An application can use the WinPostMsg function to post a message to a window. The message goes to the window's message queue. The following code fragment posts the WM_QUIT message: HWND hwnd; if (!WinPostMsg(hwnd, WM_QUIT, NULL, NULL)){ /* Message was not posted. */ } The WinPostMsg function returns FALSE if the queue is full, and the message cannot be posted. ΓòÉΓòÉΓòÉ 2.2.4. Sending a Message to a Window ΓòÉΓòÉΓòÉ An application can use the WinSendMsg function to send a message directly to a window. An application uses this function to send messages to child windows. For example, the following code fragment sends an LM_INSERTITEM message to direct a list-box control to add an item to the end of its list: HWND hwndListBox; static CHAR szWeekday[] = "Tuesday"; WinSendMsg(hwndListBox, LM_INSERTITEM, (MPARAM)LIT_END, MPFROMP(szWeekday)); WinSendMsg calls the window's window procedure and waits for it to handle the message and return a result. An application can send a message to any window in the system, as long as the application has the handle of the target window. The message queue does not store the message; however, the thread making the call must have a message queue. ΓòÉΓòÉΓòÉ 2.2.5. Broadcasting a Message ΓòÉΓòÉΓòÉ An application can send a message to multiple windows by using the WinBroadcastMsg function. Often this function is used to broadcast the WM_SYSVALUECHANGED message after an application changes a system value. The following code fragment shows how to broadcast this message to all frame windows in all applications: HWND hwnd; WinBroadcastMsg( hwnd, /* Window handle */ WM_SYSVALUECHANGED, /* Message identifier */ NULL, /* No message parameters */ NULL, BMSG_FRAMEONLY | BMSG_POSTQUEUE); /* All frame windows */ An application can broadcast messages to all windows, just frame windows, or just the windows in the application. ΓòÉΓòÉΓòÉ 2.2.6. Using Message Macros ΓòÉΓòÉΓòÉ The system header files define several macros that help create and interpret message parameters. One set of macros helps you construct message parameters. These macros are useful for sending and posting messages. For example, the following code fragment uses the MPFROMSHORT macro to convert a 16-bit integer into the 32-bit message parameter: HWND hwndButton; WinSendMsg(hwndButton, BM_SETCHECK, MPFROMSHORT(1), NULL); A second set of macros helps you extract values from a message parameter. These macros are useful for handling messages in a window procedure. The following code fragment determines whether the window receiving the WM_FOCUSCHANGE message is gaining or losing the keyboard focus. The fragment uses the SHORT1FROMMP macro to extract the focus-change flag, the SHORT2FROMMP macro to extract the focus flag, and the HWNDFROMMP macro to extract the window handle. USHORT fsFocusChange; MPARAM mp1, mp2; HWND hwndGainFocus; case WM_FOCUSCHANGE: fsFocusChange = SHORT2FROMMP(mp2); /* Gets focus-change flags */ if (SHORT1FROMMP(mp2)) /* Gaining or losing focus? */ hwndGainFocus = HWNDFROMMP(mp1); A third set of macros helps you construct a message result. These macros are useful for returning message results in a window procedure, as the following code fragment illustrates: return (MRFROM2SHORT(1, 2)); ΓòÉΓòÉΓòÉ 2.3. Summary ΓòÉΓòÉΓòÉ Following are the functions and structures used with OS/2 messages and message queues. Commonly Used Message and Message Queue Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateMsgQueue ΓöéCreates a message queue. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDefDlgProc ΓöéInvokes the default dialog Γöé Γöé Γöéprocedure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDefWindowProc ΓöéInvokes the default window Γöé Γöé Γöéprocedure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDestroyMsgQueue ΓöéDestroys the message queue. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDispatchMsg ΓöéInvokes a window procedure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinGetMsg ΓöéGets a message from the thread's Γöé Γöé Γöémessage queue and returns msg when aΓöé Γöé Γöémessage conforming to the filtering Γöé Γöé Γöécriteria is available. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinPeekMsg ΓöéInspects the thread's message queue Γöé Γöé Γöéand returns to the application with Γöé Γöé Γöéor without a message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinPostMsg ΓöéPosts a message to the message queueΓöé Γöé Γöéassociated with the window defined Γöé Γöé Γöéby hwnd. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSendDlgItemMsg ΓöéSends a message to the dialog item Γöé Γöé Γöédefined by item in the dialog windowΓöé Γöé Γöéspecified by Dlg Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSendMsg ΓöéSends a message with identity Msgid Γöé Γöé Γöéto hwnd. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Seldom-Used Message and Message Queue Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinBroadcastMsg ΓöéBroadcasts a message to multiple Γöé Γöé Γöéwindows. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCallMsgFilter ΓöéCalls a message-filter hook. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinInSendMsg ΓöéDetermines whether the current Γöé Γöé Γöéthread is processing a message sent Γöé Γöé Γöéby another thread. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinPostQueueMsg ΓöéPosts a message to a message queue. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Almost-Never Used Message and Message Queue Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryMsgPos ΓöéReturns the pointer position, in Γöé Γöé Γöéscreen coordinates, when the last Γöé Γöé Γöémessage obtained from the current Γöé Γöé Γöémessage queue is posted. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryQueueInfo ΓöéReturns the information for the Γöé Γöé Γöéspecified queue. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryQueueStatus ΓöéReturns a code indicating the statusΓöé Γöé Γöéof the message queue associated withΓöé Γöé Γöéthe caller. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinRegisterUserMsg ΓöéRegisters a user message and definesΓöé Γöé Γöéits parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetClassMsgInterest ΓöéSets the message interest of a Γöé Γöé Γöémessage class. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetMsgInterest ΓöéSets a window's message interest. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetMsgMode ΓöéIndicates the mode for the Γöé Γöé Γöégeneration and processing of Γöé Γöé Γöémessages for the private window Γöé Γöé Γöéclass of an application. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinTranslateAccel ΓöéTranslates a WM_CHAR message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWaitMsg ΓöéWaits for a filtered message. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Message and Message Queue Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéHMQ ΓöéMessage-queue handle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMQINFO ΓöéMessage-queue information structure.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéQMSG ΓöéMessage structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 3. Window Classes ΓòÉΓòÉΓòÉ A window class determines which styles and which window procedure are given to a window when it is created. This chapter explains how a PM application creates and uses window classes. ΓòÉΓòÉΓòÉ 3.1. About Window Classes ΓòÉΓòÉΓòÉ Every window is a member of a window class. An application must specify a window class when it creates a window. Each window class has an associated window procedure that is used by all windows of the same class. The window procedure handles messages for all windows of that class and, therefore, controls the behavior and appearance of the window. A window class must be registered before an application can create a window of that class. Registering a window class associates a window procedure and class styles with a class name. When an application specifies the class name in a window-creation function such as WinCreateWindow, the system creates a window that uses the window procedure and styles associated with the class name. An application can register private classes or use preregistered public window classes. ΓòÉΓòÉΓòÉ 3.1.1. Private Window Classes ΓòÉΓòÉΓòÉ A private window class is any class registered within an application. An application registers a private class by calling the WinRegisterClass function. A private class cannot be shared with other applications. When an application terminates, the system removes any data associated with the application's private window classes. An application can register a private class anytime but, typically, does so as part of application initialization. To register a private class during application initialization, the application also must call WinInitialize and, usually, WinCreateMsgQueue before class registration. An application cannot de-register a private window class; it remains registered and available until the application terminates. When an application registers a private window class, it must supply the following information: o Class name o Class styles o Window procedure o Window data size. ΓòÉΓòÉΓòÉ 3.1.1.1. Class Name ΓòÉΓòÉΓòÉ The class name identifies the window class. The application uses this name in the window-creation functions to specify the class of the window being created. The class name can be a character string or an atom, and it must be unique within the application. The system checks as to whether a public class or a class already registered by the application has the same name. If the class name is not unique to that application, the system returns an error. ΓòÉΓòÉΓòÉ 3.1.1.2. Class Styles ΓòÉΓòÉΓòÉ Each window class has one or more values, called class styles, that tell the system which initial window styles to give a window created with that class. An application sets the class styles for a private window class when it registers the class. Once a class is registered, the application cannot change the styles. An application can specify one or more of the following class styles in the WinRegisterClass function, combining them as necessary by using the bitwise OR operator: Class Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_CLIPCHILDRENΓöéPrevents a window from painting over its Γöé Γöé Γöéchild windows, but increases the time Γöé Γöé Γöénecessary to calculate the visible region. Γöé Γöé ΓöéThis style usually is not necessary, because Γöé Γöé Γöéif the parent and child windows overlap and Γöé Γöé Γöéare both invalidated, the operating system Γöé Γöé Γöédraws the parent window before drawing the Γöé Γöé Γöéchild window. If the child window is Γöé Γöé Γöéinvalidated independently of the parent Γöé Γöé Γöéwindow, the system redraws only the child Γöé Γöé Γöéwindow. If the update region of the parent Γöé Γöé Γöéwindow does not intersect the child window, Γöé Γöé Γöédrawing the parent window causes the child Γöé Γöé Γöéwindow to be redrawn. This style is useful toΓöé Γöé Γöéprevent a child window containing a complex Γöé Γöé Γöégraphic from being redrawn unnecessarily. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_CLIPSIBLINGSΓöéPrevents a window from painting over its Γöé Γöé Γöésibling windows. This style protects sibling Γöé Γöé Γöéwindows but increases the time necessary to Γöé Γöé Γöécalculate the visible region. This style is Γöé Γöé Γöéappropriate for windows that overlap and haveΓöé Γöé Γöéthe same parent window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_FRAME ΓöéIdentifies the window as a frame window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_HITTEST ΓöéDirects the operating system to send Γöé Γöé ΓöéWM_HITTEST messages to the window whenever Γöé Γöé Γöéthe mouse pointer moves in the window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_MOVENOTIFY ΓöéDirects the system to send WM_MOVE messages Γöé Γöé Γöéto the window whenever the user moves the Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_PARENTCLIP ΓöéExtends a window's visible region to include Γöé Γöé Γöéthat of its parent window. This style Γöé Γöé Γöésimplifies the calculation of the child Γöé Γöé Γöéwindow's visible region but, potentially, is Γöé Γöé Γöédangerous, because the parent window's Γöé Γöé Γöévisible region is usually larger than the Γöé Γöé Γöéchild window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_SAVEBITS ΓöéSaves the screen area under a window as a bitΓöé Γöé Γöémap. When the user hides or moves the window,Γöé Γöé Γöéthe system restores the image by copying the Γöé Γöé Γöébits; there is no need to add the area to theΓöé Γöé Γöéuncovered window's update region. This style Γöé Γöé Γöécan improve system performance, but also can Γöé Γöé Γöéconsume a great deal of memory. It is Γöé Γöé Γöérecommended only for transient windows such Γöé Γöé Γöéas menus and dialog windows-not for main Γöé Γöé Γöéapplication windows. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_SIZEREDRAW ΓöéCauses the window to receive a WM_PAINT Γöé Γöé Γöémessage and be completely invalidated Γöé Γöé Γöéwhenever the window is resized, even if it isΓöé Γöé Γöémade smaller. (Typically, only the uncovered Γöé Γöé Γöéarea of a window is invalidated when a windowΓöé Γöé Γöéis resized.) This class style is useful when Γöé Γöé Γöéan application scales graphics to fill the Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCS_SYNCPAINT ΓöéCauses the window to receive WM_PAINT Γöé Γöé Γöémessages immediately after a part of the Γöé Γöé Γöéwindow becomes invalid. Without this style, Γöé Γöé Γöéthe window receives WM_PAINT messages only ifΓöé Γöé Γöéno other message is waiting to be processed. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 3.1.1.3. Window Procedure ΓòÉΓòÉΓòÉ The window procedure for a window class processes all messages sent or posted to all windows of that class. It is the chief component of the window class because it controls the appearance and behavior of each window created with the class. Window procedures are shared by all windows of a class, so an application must ensure that no conflicts arise when two windows of the same class attempt to access the same global data. In other words, the window procedure must protect global data and other shared resources. ΓòÉΓòÉΓòÉ 3.1.1.4. Window Data Size ΓòÉΓòÉΓòÉ The system creates a window data structure for each window, which includes extra space that an application can use to store additional data about a window. An application specifies the number of extra bytes to allocate in the WinRegisterClass function. All windows of the same class have the same amount of window data space. An application can store window data in a window's data structure by using the WinSetWindowUShort and WinSetWindowULong functions. It can retrieve data by using the WinQueryWindowUShort and WinQueryWindowULong functions. ΓòÉΓòÉΓòÉ 3.1.1.5. Custom Window Styles ΓòÉΓòÉΓòÉ An application that registers a window class also can support its own set of styles for windows of that class. Standard window styles-for example, WS_VISIBLE and WS_SYNCPAINT-still apply to these windows. A window style is a 32-bit integer, and only the high 16 bits are used for the standard window styles; an application can use the low 16 bits for custom styles specific to a window class. The operating system has unique window styles for all preregistered window classes. Styles such as FS_BORDER and BS_PUSHBUTTON are processed by the window procedure for the corresponding class. This means that an application can build the support for its own window styles into the window procedure for its private class. A window style designed for one window class will not work with another window class. ΓòÉΓòÉΓòÉ 3.1.2. Public Window Classes ΓòÉΓòÉΓòÉ Public window classes are registered during system initialization. Their window procedures are in dynamic link libraries. Therefore, to use a public window class, an application need not register it. Nor does the application need to import the window procedure for a public window class because the system resolves references to the window procedure. An application cannot use a public window class name when it registers a private window class. ΓòÉΓòÉΓòÉ 3.1.2.1. System-Defined Public Window Classes ΓòÉΓòÉΓòÉ The system provides a number of public window classes that support menus, frame windows, control windows, and dialog windows. An application can create a window of a system-defined public window class by specifying one of the following class name constants in a call to WinCreateWindow: Public Window Classes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéClass Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_BUTTON ΓöéConsists of buttons and boxes the user can Γöé Γöé Γöéselect by clicking the pointing device or Γöé Γöé Γöéusing the keyboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_COMBOBOX ΓöéCreates a combination-box control, which Γöé Γöé Γöécombines a list-box control and an Γöé Γöé Γöéentry-field control. It enables the user to Γöé Γöé Γöéenter data either by typing in the entry Γöé Γöé Γöéfield or by choosing from the list in the Γöé Γöé Γöélist box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_CONTAINER ΓöéCreates a control in which the user can groupΓöé Γöé Γöéobjects in a logical manner. A container canΓöé Γöé Γöédisplay those objects in various formats or Γöé Γöé Γöéviews. The container control supports drag Γöé Γöé Γöéand drop so the user can place information inΓöé Γöé Γöéa container by simply dragging and dropping. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_ENTRYFIELD ΓöéConsists of a single line of text that the Γöé Γöé Γöéuser can edit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_FRAME ΓöéA composite window class that can contain Γöé Γöé Γöéchild windows of many of the other window Γöé Γöé Γöéclasses. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_LISTBOX ΓöéPresents a list of text items from which the Γöé Γöé Γöéuser can make selections. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_MENU ΓöéPresents a list of items that can be Γöé Γöé Γöédisplayed horizontally as menu bars, or Γöé Γöé Γöévertically as pull-down menus. Usually menusΓöé Γöé Γöéare used to provide a command interface to Γöé Γöé Γöéapplications. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_NOTEBOOK ΓöéCreates a control for the user that is Γöé Γöé Γöédisplayed as a number of pages. The top pageΓöé Γöé Γöéis visible, and the others are hidden, with Γöé Γöé Γöétheir presence being indicated by a visible Γöé Γöé Γöéedge on each of the back pages. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SCROLLBAR ΓöéConsists of window scroll bars that let the Γöé Γöé Γöéuser scroll the contents of the associated Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SLIDER ΓöéCreates a control that is usable for Γöé Γöé Γöéproducing approximate (analog) values or Γöé Γöé Γöéproperties. Scroll bars were used for this Γöé Γöé Γöéfunction in the past, but the slider providesΓöé Γöé Γöéa more flexible method of achieving the same Γöé Γöé Γöéresult, with less programming effort. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SPINBUTTON ΓöéCreates a control that presents itself to theΓöé Γöé Γöéuser as a scrollable ring of choices, giving Γöé Γöé Γöéthe user quick access to the data. The user Γöé Γöé Γöéis presented only one item at a time, so the Γöé Γöé Γöéspin button should be used with data that is Γöé Γöé Γöéintuitively related. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_STATIC ΓöéSimple display items that do not respond to Γöé Γöé Γöékeyboard or pointing device events. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_TITLEBAR ΓöéDisplays the window title or caption and letsΓöé Γöé Γöéthe user move the window's owner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_VALUESET ΓöéCreates a control similar in function to Γöé Γöé Γöéradio buttons but provides additional Γöé Γöé Γöéflexibility to display graphical, textual, Γöé Γöé Γöéand numeric formats. The values set with Γöé Γöé Γöéthis control are mutually exclusive. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Each system-defined public window class has a corresponding set of window styles that an application can use to customize a window of that class. For example, a window created with the WC_BUTTON class has styles that include BS_PUSHBUTTON and BS_CHECKBOX. Window styles enable you to customize aspects of a window's behavior and appearance. The application specifies the window styles in the WinCreateWindow function. ΓòÉΓòÉΓòÉ 3.1.2.2. Custom Public Window Classes ΓòÉΓòÉΓòÉ An application can create a custom public window class, but it must do so during system initialization. Only the shell can register a public window class, and it can do so only when the system starts. Registering a public window class requires a special load entry in the os2.ini file. That entry instructs the shell to load a dynamic link library whose initialization routine registers the window class. Custom public window classes must be registered using WinRegisterClass and must have the class style CS_PUBLIC. If a custom public window class registered this way has the same name as an existing public window class, the custom class replaces the original class. If a dynamic link library replaces an existing public window class, the library can save the address of the original window procedure and use the address to subclass the original window class. The dynamic link library retrieves the original window procedure address using the WinQueryClassInfo function. The custom window procedure then passes unprocessed messages to the original window procedure instead of calling WinDefWindowProc. When subclassing a public window class, the custom public window procedure must not make the window data size smaller than the original window data size, because all public window classes that the operating system defines use 4 extra bytes for storing a pointer to custom window data. This size is guaranteed only for public window classes defined by the operating system dynamic link libraries. ΓòÉΓòÉΓòÉ 3.1.3. Class Data ΓòÉΓòÉΓòÉ An application can examine public window class data by using the WinQueryClassInfo and WinQueryClassName functions. An application retrieves the name of the class for a given window by using the WinQueryClassName function. If the window is one of the preregistered public window classes, the name returned is in the form #nnnnn, where nnnnn is up to 5 digits, representing the value of the window class constant. Using this window class name, the application can call WinQueryClassInfo to retrieve the window class data. WinQueryClassInfo copies the class style, window procedure address, and window data size to a CLASSINFO data structure. ΓòÉΓòÉΓòÉ 3.2. Using Window Classes ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Register a private window class. o Register an imported window procedure. ΓòÉΓòÉΓòÉ 3.2.1. Registering a Private Window Class ΓòÉΓòÉΓòÉ An application can register a private window class at any time by using the WinRegisterClass function. You must define the window procedure in the application, choose a unique name, and set the window styles for the class. The following code fragment shows how to register the window class name "MyPrivateClass": MRESULT EXPENTRY ClientWndProc(HWND hwnd,ULONG msg,MPARAM mp1, MPARAM mp2); HAB hab; WinRegisterClass(hab, /* Anchor block handle */ "MyPrivateClass", /* Name of class being registered */ ClientWndProc, /* Window procedure for class */ CS_SIZEREDRAW | /* Class style */ CS_HITTEST, /* Class style */ 0); /* Extra bytes to reserve */ ΓòÉΓòÉΓòÉ 3.3. Summary ΓòÉΓòÉΓòÉ Following are the operating system functions and the structure used with window classes. Window Class Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryClassInfo ΓöéReturns window class information. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryClassName ΓöéCopies, into a buffer, the window Γöé Γöé Γöéclass name as a null-terminated Γöé Γöé Γöéstring. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinRegisterClass ΓöéRegisters a window class. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSubclassWindow ΓöéSubclasses the indicated window by Γöé Γöé Γöéreplacing its window procedure with Γöé Γöé Γöéanother window procedure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Window Class Structure ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCLASSINFO ΓöéClass-information structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 4. Window Procedures ΓòÉΓòÉΓòÉ Windows have an associated window procedure-a function that processes all messages sent or posted to a window. Every aspect of a window's appearance and behavior depends on the window procedure's response to the messages. This chapter explains how window procedures function, in general, and describes the default window procedure. ΓòÉΓòÉΓòÉ 4.1. About Window Procedures ΓòÉΓòÉΓòÉ Every window belongs to a window class that determines which window procedure a particular window uses to process its messages. All windows of the same class use the same window procedure. For example, the operating system defines a window procedure for the frame window class (WC_FRAME), and all frame windows use that window procedure. An application typically defines at least one new window class and an associated window procedure. Then, the application can create many windows of that class, all of which use the same window procedure. This means that the same piece of code can be called from several sources simultaneously; therefore, you must be careful when modifying shared resources from a window procedure. Dialog procedures have the same structure and function as window procedures. The primary difference between a dialog procedure and a window procedure is the absence of a client window in the dialog procedure; that is, the controls in a dialog procedure are the immediate child windows of the frame, whereas the controls in a normal window are the grandchildren of the frame. This makes significant differences in the code between the two; for example, WinSendDlgItemMsg does not work from a client window if you pass the client window handle as the first parameter. ΓòÉΓòÉΓòÉ 4.1.1. Structure of a Window Procedure ΓòÉΓòÉΓòÉ A window procedure is a function that takes 4 arguments and returns a 32-bit pointer. The arguments of a window procedure consist of a window handle, a ULONG message identifier, and two arguments, called message parameters, that are declared with the MPARAM data type. The system defines an MPARAM as a 32-bit pointer to a VOID data type (a generic pointer). The message parameters actually might contain any of the standard data types. The message parameters are interpreted differently, depending on the value of the message identifier. OS/2 2.0 includes several macros that enable the application to cast the information from the MPARAM values into the actual data type. SHORT1FROMMP, for example, extracts a 16-bit value from a 32-bit MPARAM. The window-procedure arguments are described in the following table: Window Procedure Arguments ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéArgument ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöéhwnd ΓöéHandle of the window receiving the message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöémsg ΓöéMessage identifier. The message will Γöé Γöé Γöécorrespond to one of the predefined constantsΓöé Γöé Γöé(for example, WM_CREATE) defined in the Γöé Γöé Γöésystem include files or be an Γöé Γöé Γöéapplication-defined message identifier. The Γöé Γöé Γöévalue of an application-defined message Γöé Γöé Γöéidentifier must be greater than the value of Γöé Γöé ΓöéWM_USER, and less than or equal to 0xffff. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöémp1,mp2 ΓöéMessage parameters. Their interpretation Γöé Γöé Γöédepends on the particular message. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ The return value of a window procedure is defined as an MRESULT data type. The interpretation of the return value depends on the particular message. Consult the description of each message to determine the appropriate return value. ΓòÉΓòÉΓòÉ 4.1.2. Default Window Procedure ΓòÉΓòÉΓòÉ All windows in the system share certain fundamental behavior, defined in the default window-procedure function, WinDefWindowProc. The default window procedure provides the minimal functionality for a window. An application-defined window procedure should pass any messages it does not process to WinDefWindowProc for default processing. ΓòÉΓòÉΓòÉ 4.1.3. Window-Procedure Subclassing ΓòÉΓòÉΓòÉ Subclassing enables an application to intercept and process messages sent or posted to a window before that window has a chance to process them. Subclassing most often is used to add functionality to a particular window or to alter a window's default behavior. An application subclasses a window by using the WinSubclassWindow function to replace the window's original window procedure with an application-defined window procedure. Thereafter, the new window procedure processes any messages that are sent or posted to the window. If the new window procedure does not process a particular message, it must pass the message to the original window procedure, not to WinDefWindowProc, for default processing. ΓòÉΓòÉΓòÉ 4.2. Using Window Procedures ΓòÉΓòÉΓòÉ This section explains how to: o Design a window procedure o Associate a window procedure with a window class o Subclass a window. ΓòÉΓòÉΓòÉ 4.2.1. Designing a Window Procedure ΓòÉΓòÉΓòÉ The following code fragment shows the structure of a typical window procedure and how to use the message argument in a switch statement, with individual messages handled by separate case statements. Notice that each case returns a specific value for each message. For messages that it does not handle itself, the window procedure calls WinDefWindowProc. MRESULT ClientWndProc( HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2) { /* Define local variables here, if required. */ switch (msg) { case WM_CREATE: /* Initialize private window data. */ return (MRESULT) FALSE; case WM_PAINT: /* Paint the window. */ return 0; case WM_DESTROY: /* Clean up private window data. */ return 0; default: break; } return WinDefWindowProc (hwnd, msg, mp1, mp2); } A dialog window procedure does not receive the WM_CREATE message; however, it does receive a WM_INITDLG message when all of its control windows have been created. At the very least, a window procedure should handle the WM_PAINT message to draw itself. Typically, it should handle mouse and keyboard messages as well. Consult the descriptions of individual messages to determine whether your window procedure should handle them. An application can call WinDefWindowProc as part of the processing of a message. In such a case, the application can modify the message parameters before passing the message to WinDefWindowProc or can continue with the default processing after performing its own operations. ΓòÉΓòÉΓòÉ 4.2.2. Associating a Window Procedure with a Window Class ΓòÉΓòÉΓòÉ To associate a window procedure with a window class, an application must pass a pointer to that window procedure to the WinRegisterClass function. Once an application has registered the window procedure, the procedure automatically is associated with each new window created with that class. The following code fragment shows how to associate the window procedure in the previous example with a window class: HAB hab; CHAR szClientClass[] = "My Window Class"; WinRegisterClass(hab, /* Anchor-block handle */ szClientClass, /* Class name */ ClientWndProc, /* Pointer to procedure */ CS_SIZEREDRAW, /* Class style */ 0); /* Window data */ ΓòÉΓòÉΓòÉ 4.2.3. Subclassing a Window ΓòÉΓòÉΓòÉ To subclass a window, an application calls the WinSubclassWindow function, specifying the handle of the window to subclass and a pointer to the new window procedure. The WinSubclassWindow function returns a pointer to the original window procedure; the application can use this pointer to pass unprocessed messages to the original procedure. The following code fragment subclasses a push button control window. The new window procedure generates a beep whenever the user clicks the push button. PFNWP pfnPushBtn; CHAR szCancel[] = "Cancel"; HWND hwndClient; HWND hwndPushBtn; . . . /* Create a push button control. */ hwndPushBtn = WinCreateWindow( hwndClient, /* Parent-window handle */ WC_BUTTON, /* Window class */ szCancel, /* Window text */ WS_VISIBLE | /* Window style */ WS_SYNCPAINT | /* Window style */ BS_PUSHBUTTON, /* Button style */ 50, 50, /* Physical position */ 70, 30, /* Width and height */ hwndClient, /* Owner-window handle */ HWND_TOP, /* Z-order position */ 1, /* Window identifier */ NULL, /* No control data */ NULL); /* No presentation parameters */ /* Subclass the push button control. */ pfnPushBtn = WinSubclassWindow(hwndPushBtn, SubclassPushBtnProc); . . . } /* This procedure subclasses the push button. */ MRESULT EXPENTRY SubclassPushBtnProc(HWND hwnd,ULONG msg,MPARAM mp1, MPARAM mp2) { switch (msg) { /* Beep when the user clicks the push button. */ case WM_BUTTON1DOWN: DosBeep(1000, 250); break; default: break; } /* Pass all messages to the original window procedure. */ return (MRESULT) pfnPushBtn(hwnd, msg, mp1, mp2); } ΓòÉΓòÉΓòÉ 4.3. Summary ΓòÉΓòÉΓòÉ Following are the window-procedure functions and messages processed by the default window procedure. Window Procedure Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDefDlgProc ΓöéThe default dialog procedure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDefWindowProc ΓöéThe default window procedure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinRegisterClass ΓöéRegisters a window class. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSubclassWindow ΓöéSubclasses the indicated window by Γöé Γöé Γöéreplacing its window procedure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Default Window Procedure Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéOccurs when the user presses button Γöé Γöé Γöé1 of the pointing device twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1UP ΓöéOccurs when the user releases Γöé Γöé Γöépointer button 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DBLCLK ΓöéOccurs when the user presses button Γöé Γöé Γöé2 of the pointing device twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 2. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2UP ΓöéOccurs when the user releases Γöé Γöé Γöépointer button 2. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DBLCLK ΓöéOccurs when the user presses button Γöé Γöé Γöé3 of the pointing device twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 3. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3UP ΓöéOccurs when the user releases Γöé Γöé Γöépointer button 3. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CALCVALIDRECTS ΓöéSent to determine which areas of a Γöé Γöé Γöéwindow can be preserved if a window Γöé Γöé Γöéis sized and which can be Γöé Γöé Γöéredisplayed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéOccurs when the user presses a key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CLOSE ΓöéSent to a frame window to indicate Γöé Γöé Γöéthat the window is being closed by Γöé Γöé Γöéthe user. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to a control's owner window Γöé Γöé Γöéwhen the pointer moves over the Γöé Γöé Γöécontrol window, allowing the user toΓöé Γöé Γöéset the pointer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DDE_INITIATE ΓöéSent by an application to one or Γöé Γöé Γöémore other applications to request Γöé Γöé Γöéinitiation of a conversation. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DDE_INITIATEACK ΓöéSent by a server application in Γöé Γöé Γöéresponse to a WM_DDE_INITIATE Γöé Γöé Γöémessage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_FOCUSCHANGE ΓöéOccurs when the focus window is Γöé Γöé Γöéchanged. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HELP ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner, or when a key stroke has beenΓöé Γöé Γöétranslated into a WM_HELP by an Γöé Γöé Γöéaccelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HITTEST ΓöéSent to determine which window is Γöé Γöé Γöéassociated with an input from the Γöé Γöé Γöépointing device. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MENUSELECT ΓöéOccurs when a menu item is selected.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéOccurs when the pointing device Γöé Γöé Γöépointer moves. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéOccurs when a window needs Γöé Γöé Γöérepainting. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé ΓöéDBCS conversion. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYFOCUSCHAIN ΓöéRequests the handle of a window in Γöé Γöé Γöéthe focus chain. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYFRAMECTLCOUNT ΓöéSent to the frame window in responseΓöé Γöé Γöéto receipt of a WM_SIZE or Γöé Γöé ΓöéWM_UPDATEFRAME message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe window parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TIMER ΓöéPosted when a timer times out. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TRANSLATEACCEL ΓöéSent to the focus window when a Γöé Γöé ΓöéWM_CHAR message occurs. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 5. Mouse and Keyboard Input ΓòÉΓòÉΓòÉ An OS/2 Presentation Manager application can accept input from both a mouse (or other pointing device) and the keyboard. This chapter explains how these input events should be received and processed. ΓòÉΓòÉΓòÉ 5.1. About Mouse and Keyboard Input ΓòÉΓòÉΓòÉ Only one window at a time can receive keyboard input, and only one window at a time can receive mouse input; but they do not have to be the same window. All keyboard input goes to the window with the input focus, and, normally, all mouse input goes to the window under the mouse pointer. ΓòÉΓòÉΓòÉ 5.1.1. System Message Queue ΓòÉΓòÉΓòÉ The operating system routes all keystrokes and mouse input to the system message queue, converting these input events into messages, and posts them, one at a time, to the proper application-defined message queues. An application retrieves messages from its queue and dispatches them to the appropriate window procedures, which process the messages. Mouse and keyboard input events in the system message queue are strictly ordered so that a new event cannot be processed until all previous events are fully processed: the system cannot determine the destination window of an input event until then. For example, if a user types a command in one window, clicks the mouse to activate another window, then types a command in the second window, the destination of the second command depends on how the application handles the mouse click. The second command would go to the second window only if that window became active as a result of the mouse click. It is important for an application to process all messages quickly to avoid slowing user interaction with the system. A message must be responded to immediately in the current thread, but the processing it initiates should be done asynchronously in another thread that has no windows in the desktop tree. OS/2 can display multiple windows belonging to several applications at the same time. To manage input among these windows, the system uses the concepts of window activation and keyboard focus. ΓòÉΓòÉΓòÉ 5.1.2. Window Activation ΓòÉΓòÉΓòÉ Although the operating system can display windows from many different applications simultaneously during a PM session, the user can interact with only one application at a time-the active application. The other applications continue to run, but they cannot receive user input until they become active. To enable the user to easily identify the active application, the system activates all frames in the tree between HWND_DESKTOP and the window with input focus. That is, the system positions the active frame window above all other top-level windows on the screen. If the active window is a standard frame window, the window's title bar and sizing border are highlighted. The user can control which application is active by clicking on a window or by pressing the Alt+Tab or Alt+Esc key combinations. An application can set the active frame window by calling WinSetActiveWindow; it also can obtain the handle of the active frame window by using WinQueryActiveWindow. When one window is deactivated and another activated, the system sends a WM_ACTIVATE message, first to the window being deactivated, then to the window being activated. The fActive parameter of the WM_ACTIVATE message is set to FALSE for the window being deactivated and set to TRUE for the window being activated. An application can use this message to track the activation state of a client window. ΓòÉΓòÉΓòÉ 5.1.3. Keyboard Focus ΓòÉΓòÉΓòÉ The keyboard focus is a temporary attribute of a window; the window that has the keyboard focus receives all keyboard input until the focus changes to a different window. The system converts keyboard input events into WM_CHAR messages and posts them to the message queue of the window that has the keyboard focus. An application can set the keyboard focus to a particular window by calling WinSetFocus. If the application does not use WinSetFocus to explicitly set the keyboard-focus window, the system sets the focus to the active frame window. The following events occur when an application uses WinSetFocus to shift the keyboard focus from one window (the original window) to another (the new window): 1. The system sends the original window a WM_SETFOCUS message (with the fFocus parameter set to FALSE), indicating that that window has lost the keyboard focus. 2. The system then sends the original window a WM_SETSELECTION message, indicating that the window should remove the highlight from the current selection. 3. If the original (frame) window is being deactivated, the system sends it a WM_ACTIVATE message (with the fActive parameter set to FALSE), indicating that the window is no longer active. 4. The system then sends the new application a WM_ACTIVATE message (with fActive set to TRUE), indicating that the new application is now active. 5. If the new (main) window is being activated, the system sends it a WM_ACTIVATE message (with fActive set to TRUE), indicating that the main window is now active. 6. The system sends the new window a WM_SETSELECTION message, indicating that the window should highlight the current selection. 7. Finally, the system sends the new window a WM_SETFOCUS message (with fFocus set to TRUE), indicating that the new window has the keyboard focus. If, while processing a WM_SETFOCUS message, an application calls WinQueryActiveWindow, that function returns the handle of the previously-active window until the application establishes a new active window. Similarly, if the application, while processing WM_SETFOCUS, calls WinQueryFocus, that function returns the handle of the previous keyboard-focus window until the application establishes a new keyboard-focus window. In other words, even though the system has sent WM_ACTIVATE and WM_SETFOCUS messages (with the fActive and fFocus parameters set to FALSE) to the previous windows, those windows are considered the active and focus windows until the system establishes new active and focus windows. If the application calls WinSetFocus while processing a WM_ACTIVATE message, the system does not send a WM_SETFOCUS message (with fFocus set to FALSE), because no window has the focus. A client window receives a WM_ACTIVATE message when its parent frame window is being activated or deactivated. The activation or deactivation message usually is followed by a WM_SETFOCUS message that specifies whether the client window is gaining or losing the keyboard focus. Therefore, if the client window needs to change the keyboard focus, it should do so during the WM_SETFOCUS message, not during the WM_ACTIVATE message. ΓòÉΓòÉΓòÉ 5.1.4. Keyboard Messages ΓòÉΓòÉΓòÉ The system sends keyboard input events as WM_CHAR messages to the message queue of the keyboard-focus window. If no window has the keyboard focus, the system posts WM_CHAR messages to the message queue of the active frame window. Following are two typical situations in which an application receives WM_CHAR messages: An application has a client window or custom control window, either of which can have the keyboard focus. If the window procedure for the client or control window does not process WM_CHAR messages, it should pass them to WinDefWindowProc, which will pass them to the owner. Dialog control windows, in particular, should pass unprocessed WM_CHAR messages to the WinDefDlgProc function, because this is how the user interface implements control processing for the Tab and Arrow keys. An application window owns a control window whose window procedure can handle some, but not all, WM_CHAR messages. This is common in dialog windows. If the window procedure of a control in a dialog window cannot process a WM_CHAR message, the procedure can pass the message to the WinDefDlgProc function. This function sends the message to the control window's owner, which usually is a dialog frame window. The application's dialog procedure then receives the WM_CHAR message. This also is the case when an application client window owns a control window. A WM_CHAR message can represent a key-down or key-up transition. It might contain a character code, virtual-key code, or scan code. This message also contains information about the state of the Shift, Ctrl, and Alt keys. Each time a user presses a key, at least two WM_CHAR messages are generated: one when the key is pressed, and one when the key is released. If the user holds down the key long enough to trigger the keyboard repeat, multiple WM_CHAR key-down messages are generated. If the keyboard repeats faster than the application can retrieve the input events from its message queue, the system combines repeating character events into one WM_CHAR message and increments a count byte that indicates the number of keystrokes represented by the message. Generally, this byte is set to 1, but an application should check each WM_CHAR message to avoid missing any keystrokes. An application can ignore the repeat count. For example, an application might ignore the repeat count on Arrow keys to prevent the cursor from skipping characters when the system is slow. ΓòÉΓòÉΓòÉ 5.1.4.1. Message Flags ΓòÉΓòÉΓòÉ Applications decode WM_CHAR messages by examining individual bits in the flag word contained in the first message parameter (mp1) that the system passes with every WM_CHAR message. The type of flag word indicates the nature of the message. The system can set the bits in the flag word in various combinations. For example, a WM_CHAR message can have the KC_CHAR, KC_SCANCODE, and KC_SHIFT attribute bits all set at the same time. An application can use the following list of flag values to test the flag word and determine the nature of a WM_CHAR message: Keyboard Character Flags ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFlag Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_ALT ΓöéIndicates that the Alt key was down when the Γöé Γöé Γöémessage was generated. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_CHAR ΓöéIndicates that the message contains a valid Γöé Γöé Γöécharacter code for a key, typically an ASCII Γöé Γöé Γöécharacter code. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_COMPOSITE ΓöéIn combination with the KC_CHAR flag, this Γöé Γöé Γöéflag indicates that the character code is a Γöé Γöé Γöécombination of the key that was pressed and Γöé Γöé Γöéthe previous dead key. This flag is used to Γöé Γöé Γöécreate characters with diacritical marks. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_CTRL ΓöéIndicates that the Ctrl key was down when theΓöé Γöé Γöémessage was generated. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_DEADKEY ΓöéIn combination with the KC_CHAR flag, this Γöé Γöé Γöéflag indicates that the character code Γöé Γöé Γöérepresents a dead-key glyph (such as an Γöé Γöé Γöéaccent). An application displays the Γöé Γöé Γöédead-key glyph and does not advance the Γöé Γöé Γöécursor. Typically, the next WM_CHAR message Γöé Γöé Γöéis a KC_COMPOSITE message, containing the Γöé Γöé Γöéglyph associated with the dead key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_INVALIDCHAR ΓöéIndicates that the character is not valid forΓöé Γöé Γöéthe current translation tables. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_INVALIDCOMP ΓöéIndicates that the character code is not Γöé Γöé Γöévalid in combination with the previous dead Γöé Γöé Γöékey. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_KEYUP ΓöéIndicates that the message was generated whenΓöé Γöé Γöéthe user released the key. If this flag is Γöé Γöé Γöéclear, the message was generated when the Γöé Γöé Γöéuser pressed the key. An application can useΓöé Γöé Γöéthis flag to determine key-down and key-up Γöé Γöé Γöéevents. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_LONEKEY ΓöéIn combination with the KC_KEYUP flag, this Γöé Γöé Γöéflag indicates that the user pressed no otherΓöé Γöé Γöékey while this key was down. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_PREVDOWN ΓöéIn combination with the KC_VIRTUALKEY flag, Γöé Γöé Γöéthis flag indicates that the virtual key was Γöé Γöé Γöépressed previously. If this flag is clear, Γöé Γöé Γöéthe virtual key was not previously pressed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_SCANCODE ΓöéIndicates that the message contains a valid Γöé Γöé Γöéscan code generated by the keyboard when the Γöé Γöé Γöéuser pressed the key. The system uses the Γöé Γöé Γöéscan code to identify the character code in Γöé Γöé Γöéthe current code page; therefore, most Γöé Γöé Γöéapplications do not need the scan code unlessΓöé Γöé Γöéthey cannot identify the key that the user Γöé Γöé Γöépressed. WM_CHAR messages generated by user Γöé Γöé Γöékeyboard input generally have a valid scan Γöé Γöé Γöécode, but WM_CHAR messages posted to the Γöé Γöé Γöéqueue by other applications might not containΓöé Γöé Γöéa scan code. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_SHIFT ΓöéIndicates that the Shift key was down when Γöé Γöé Γöéthe message was generated. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_TOGGLE ΓöéToggles on and off every time the user Γöé Γöé Γöépresses a specified key. This is important Γöé Γöé Γöéfor keys like NumLock, which have an on or Γöé Γöé Γöéoff state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéKC_VIRTUALKEY ΓöéIndicates that the message contains a valid Γöé Γöé Γöévirtual-key code for a key. Virtual keys Γöé Γöé Γöétypically correspond to function keys. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ The mp1 and mp2 parameters of the WM_CHAR message contain information describing the nature of a keyboard input event, as follows: o SHORT1FROMMP (mp1) contains the flag word. o CHAR3FROMMP (mp1) contains the key-repeat count. o CHAR4FROMMP (mp1) contains the scan code. o SHORT1FROMMP (mp2) contains the character code. o SHORT2FROMMP (mp2) contains the virtual key code. An application window procedure should return TRUE if it processes a particular WM_CHAR message or FALSE if it does not. Typically, applications respond to key-down events and ignore key-up events. The following sections describe the different types of WM_CHAR messages. Generally, an application decodes these messages by creating layers of conditional statements that discriminate among the different combinations of flag and code attributes that can occur in a keyboard message. ΓòÉΓòÉΓòÉ 5.1.4.2. Key-Down or Key-Up Events ΓòÉΓòÉΓòÉ Typically, the first attribute that an application checks in a WM_CHAR message is the key-down or key-up event. If the KC_KEYUP bit of the flags word is set, the message is from a key-up event. If the flag is clear, the message is from a key-down event. ΓòÉΓòÉΓòÉ 5.1.4.3. Repeat-Count Events ΓòÉΓòÉΓòÉ An application can check the key-repeat count of a WM_CHAR message to determine whether the message represents more than 1 keystroke. The count is greater than 1 if the keyboard is sending characters to the system queue faster than the application can retrieve them. If the system queue fills up, the system combines consecutive keyboard input events for each key into a single WM_CHAR message, with the key-repeat count set to the number of combined events. ΓòÉΓòÉΓòÉ 5.1.4.4. Character Codes ΓòÉΓòÉΓòÉ The most typical use of WM_CHAR messages is to extract a character code from the message and display the character on the screen. When the KC_CHAR flag is set in the WM_CHAR message, the low word of mp2 contains a character code based on the current code page. Generally, this value is a character code (typically, an ASCII code) for the key that was pressed. ΓòÉΓòÉΓòÉ 5.1.4.5. Virtual-Key Codes ΓòÉΓòÉΓòÉ WM_CHAR messages often contain virtual-key codes that correspond to various function keys and direction keys on a typical keyboard. These keys do not correspond to any particular glyph code but are used to initiate operations. When the KC_VIRTUALKEY flag is set in the flag word of a WM_CHAR message, the high word of mp2 contains a virtual-key code for the key. Note: Some keys, such as the Enter key, have both a valid character code and a virtual-key code. WM_CHAR messages for these keys will contain character codes for both newline characters (ASCII 11) and virtual-key codes (VK_ENTER). ΓòÉΓòÉΓòÉ 5.1.4.6. Scan Codes ΓòÉΓòÉΓòÉ A third possible value in a WM_CHAR message is the scan code of the key that was pressed. The scan code represents the value that the keyboard hardware generates when the user presses a key. An application can use the scan code to identify the physical key pressed, as opposed to the character code represented by the same key. ΓòÉΓòÉΓòÉ 5.1.4.7. Accelerator-Table Entries ΓòÉΓòÉΓòÉ The system checks all incoming keyboard messages to see whether they match any existing accelerator-table entries (in either the system message queue or the application message queue). The system first checks the accelerator table associated with the active frame window; if it does not find a match, the system uses the accelerator table associated with the message queues. If the keyboard input event corresponds to an accelerator-table entry, the system changes the WM_CHAR message to a WM_COMMAND, WM_SYSCOMMAND, or WM_HELP message, depending on the attributes of the accelerator table. If the keyboard input event does not correspond to an accelerator-table entry, the system passes the WM_CHAR message to the keyboard-focus window. Applications should use accelerator tables to implement keyboard shortcuts rather than translate command keystrokes. For example, if an application uses the F2 key to save a document, the application should create a keyboard accelerator entry for the F2 virtual key so that, when pressed, the F2 key generates a WM_COMMAND message rather than a WM_CHAR message. ΓòÉΓòÉΓòÉ 5.1.5. Mouse Messages ΓòÉΓòÉΓòÉ Mouse messages occur when a user presses or releases one of the mouse buttons (a click) and when the mouse moves. All mouse messages contain the x and y coordinates of the mouse-pointer hot spot (relative to the coordinates of the window receiving the message) at the time the event occurs. The mouse-pointer hot spot is the location in the mouse-pointer bit map that the system tracks and recognizes as the position of the mouse pointer. If a window has the CS_HITTEST style, the system sends the window a WM_HITTEST message when the window is about to receive a mouse message. Most applications pass WM_HITTEST messages on to WinDefWindowProc by default, so disabled windows do not receive mouse messages. Windows that specifically respond to WM_HITTEST messages can change this default behavior. If the window is enabled and should receive the mouse message, the WinDefWindowProc function (using the default processing for WM_HITTEST) returns the value HT_NORMAL. If the window is disabled, WinDefWindowProc returns HT_ERROR, in which case the window does not receive the mouse message. The default window procedure processes the WM_HITTEST message and the usHit parameter in the WM_MOUSEMOVE message. Therefore, unless an application needs to return special values for the WM_HITTEST message or the usHit parameter, it can ignore them. One possible reason for processing the WM_HITTEST message is for the application to react differently to a mouse click in a disabled window. The contents of the mouse-message parameters (mp1 and mp2) are as follows: o SHORT1FROMMP (mp1) contains the x position. o SHORT2FROMMP (mp1) contains the y position. o SHORT1FROMMP (mp2) contains the hit-test parameter. ΓòÉΓòÉΓòÉ 5.1.6. Capturing Mouse Input ΓòÉΓòÉΓòÉ The operating system generally posts mouse messages to the window that is under the mouse pointer at the time the system reads the mouse input events from the system message queue. An application can change this by using the WinSetCapture function to route all mouse messages to a specific window or to the message queue associated with the current thread. If mouse messages are routed to a specific window, that window receives all mouse input until either the window releases the mouse or the application specifies another capture window. If mouse messages are routed to the current message queue, the system posts each mouse message to the queue with the hwnd member of the QMSG structure for each message set to NULL. Because no window handle is specified, the WinDispatchMsg function in the application's main message loop cannot pass these messages to a window procedure for processing. Therefore, the application must process these messages in the main loop. Capturing mouse input is useful if a window needs to receive all mouse input, even when the pointer moves outside the window. For example, applications commonly track the mouse-pointer position after a mouse "button down" event, following the pointer until a "button up" event is received from the system. If an application does not call WinSetCapture for a window and the user releases the mouse button, the application does not receive the button-up message. If the application sets a window to capture the mouse and tracks the mouse pointer, the application receives the button-up message even if the user moves the mouse pointer outside the window. Some applications are designed to require a button-up message to match a button-down message. When processing a button-down message, these applications call WinSetCapture to set the capture to their own window; then, when processing a matching button-up message, they call WinSetCapture, with a NULL window handle, to release the mouse. ΓòÉΓòÉΓòÉ 5.1.6.1. Button Clicks ΓòÉΓòÉΓòÉ An application window's response to a mouse click depends on whether the window is active. The first click in an inactive window should activate the window. Subsequent clicks in the active window produce an application-specific action. A common problem for an application that processes WM_BUTTON1DOWN or similar messages is failing to activate the window or set the keyboard focus. If the window processes WM_CHAR messages, the window procedure should call WinSetFocus to make sure the window receives the keyboard focus and is activated. If the window does not process WM_CHAR messages, the application should call WinSetActiveWindow to activate the window. ΓòÉΓòÉΓòÉ 5.1.6.2. Mouse Movement ΓòÉΓòÉΓòÉ The system sends WM_MOUSEMOVE messages to the window that is under the mouse pointer, or to the window that currently has captured the mouse, whenever the mouse pointer moves. This is useful for tracking the mouse pointer and changing its shape, based on its location in a window. For example, the mouse pointer changes shape when it passes over the size border of a standard frame window. All standard control windows use WM_MOUSEMOVE messages to set the mouse-pointer shape. If an application handles WM_MOUSEMOVE messages in some situations but not others, unused messages should be passed to the WinDefWindowProc function to change the mouse-pointer shape. ΓòÉΓòÉΓòÉ 5.2. Using the Mouse and Keyboard ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Determine the active status of a frame window. o Check for a key-up or key-down event. o Respond to a character message. o Handle virtual-key codes. o Handle a scan code. ΓòÉΓòÉΓòÉ 5.2.1. Determining the Active Status of a Frame Window ΓòÉΓòÉΓòÉ The activated state of a window is a frame-window characteristic. The system does not provide an easy way to determine whether a client window is part of the active frame window. That is, the window handle returned by the WinQueryActiveWindow function identifies the active frame window rather than the client window owned by the frame window. Following are two methods for determining the activated state of a frame window that owns a particular client window: o Call WinQueryActiveWindow and compare the window handle it returns with the handle of the frame window that contains the client window, as shown in the following code fragment: HWND hwndClient; BOOL fActivated; fActivated = (WinQueryWindow(hwndClient, QW_PARENT) == WinQueryActiveWindow(HWND_DESKTOP)); o Each time the frame window is activated, the client window receives a WM_ACTIVATE message with the low word of the mp2 equal to TRUE. When the frame window is deactivated, the client window receives a WM_ACTIVATE message with a FALSE activation indicator. ΓòÉΓòÉΓòÉ 5.2.2. Checking for a Key-Up or Key-Down Event ΓòÉΓòÉΓòÉ The following code fragment shows how to decode a WM_CHAR message to determine whether it indicates a key-up event or a key-down event: USHORT fsKeyFlags; case WM_CHAR: { USHORT fsKeyFlags = SHORT1FROMMP(mp1); if (fsKeyFlags & KC_KEYUP) { . . /* Perform key-up processing. */ . } else { . . /* Perform key-down processing. */ . } return; } ΓòÉΓòÉΓòÉ 5.2.3. Responding to a Character Message ΓòÉΓòÉΓòÉ The following code fragment shows how to respond to a character message: USHORT fsKeyFlags; UCHAR uchChr1; case WM_CHAR: fsKeyFlags = (USHORT) SHORT1FROMMP(mp1); if (fsKeyFlags & KC_CHAR) { /* Get the character code from mp2. */ uchChr1 = (UCHAR) CHAR1FROMMP(mp2); . . /* Process the character. */ . return TRUE; } If the KC_CHAR flag is not set, the mp2 parameter from CHAR1FROMMP still might contain useful information. If either the Alt key or the Ctrl key, or both, are down, the KC_CHAR bit is not set when the user presses another key. For example, if the user presses the a key when the Alt key is down, the low word of mp2 contains the ASCII value for "a" (0x0061), the KC_ALT flag is set, and the KC_CHAR flag is clear. If the translation does not generate any valid characters, the char field is set to 0. ΓòÉΓòÉΓòÉ 5.2.4. Handling Virtual-Key Codes ΓòÉΓòÉΓòÉ The following code fragment shows how to decode a WM_CHAR message containing a valid virtual-key code: USHORT fsKeyFlags; case WM_CHAR: fsKeyFlags = (USHORT) SHORT1FROMMP(mp1); if (fsKeyFlags & KC_VIRTUALKEY) { /* Get the virtual key from mp2. */ switch (SHORT2FROMMP(mp2)) { case VK_TAB: . . /* Process the TAB key. */ . return TRUE; case VK_LEFT: . . /* Process the LEFT key. */ . return TRUE; case VK_UP: . . /* Process the UP key. */ . return TRUE; case VK_RIGHT: . . /* Process the RIGHT key. */ . return TRUE; case VK_DOWN: . . /* Process the DOWN key. */ . return TRUE; . . /* Etc... */ . default: return FALSE; } } ΓòÉΓòÉΓòÉ 5.2.5. Handling a Scan Code ΓòÉΓòÉΓòÉ All WM_CHAR messages generated by keyboard input events have valid scan codes. WM_CHAR messages posted by other applications might or might not have valid scan codes. The following code fragment shows how to extract a scan code from a WM_CHAR message: USHORT fsKeyFlags; UCHAR uchScanCode; case WM_CHAR: fsKeyFlags = (USHORT) SHORT1FROMMP(mp1); if (fsKeyFlags & KC_SCANCODE) { /* Get the scan code from mp1. */ uchScanCode = CHAR4FROMMP(mp1); . . /* Process the scan code. */ . return (MRESULT) TRUE; } ΓòÉΓòÉΓòÉ 5.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions and messages used with activation and keyboard/mouse input. Mouse/Keyboard Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinEnablePhysInput ΓöéEnables or disables queuing ofΓöé Γöé Γöéphysical input. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinFocusChange ΓöéChanges the focus window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinGetKeyState ΓöéReturns the state of the key Γöé Γöé Γöéat the time the last message Γöé Γöé Γöéfrom the message queue was Γöé Γöé Γöéposted. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinGetPhysKeyState ΓöéReturns the physical key Γöé Γöé Γöéstate. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinIsPhysInputEnabled ΓöéReturns the status of the Γöé Γöé Γöéhardware (on/off) Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryActiveWindow ΓöéReturns the active window for Γöé Γöé ΓöéHWND_DESKTOP or other parent Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryCapture ΓöéReturns the handle of the Γöé Γöé Γöéwindow the pointer has Γöé Γöé Γöécaptured. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryFocus ΓöéReturns the focus window; NULLΓöé Γöé Γöéif there is not focus window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetActiveWindow ΓöéMakes the frame window the Γöé Γöé Γöéactive window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetCapture ΓöéCaptures all pointing device Γöé Γöé Γöémessages. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetFocus ΓöéSets the focus window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetKeyboardStateTable ΓöéGets or sets the keyboard Γöé Γöé Γöéstate. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Focus-Change and Activation Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ACTIVATE ΓöéSent when a different window becomesΓöé Γöé Γöéthe active window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_FOCUSCHANGE ΓöéOccurs when the window having the Γöé Γöé Γöéfocus is changed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYFOCUSCHAIN ΓöéRequests the handle of a window in Γöé Γöé Γöéthe focus chain. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETFOCUS ΓöéOccurs when a window is to lose or Γöé Γöé Γöégain the input focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETSELECTION ΓöéOccurs when a window is selected or Γöé Γöé Γöédeselected. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Mouse Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéOccurs when the user presses button Γöé Γöé Γöé1 of the pointing device twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1UP ΓöéOccurs when the user releases Γöé Γöé Γöépointer button 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DBLCLK ΓöéOccurs when the user presses button Γöé Γöé Γöé2 of the pointing device twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 2. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2UP ΓöéOccurs when the user releases Γöé Γöé Γöépointer button 2. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DBLCLK ΓöéOccurs when the user presses button Γöé Γöé Γöé3 on the pointing device twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 3. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3UP ΓöéOccurs when the user releases Γöé Γöé Γöépointer button 3. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HITTEST ΓöéSent to determine which window is Γöé Γöé Γöéassociated with an input from the Γöé Γöé Γöépointing device. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéOccurs when the pointing device Γöé Γöé Γöépointer moves. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Keyboard Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéOccurs when the user presses a key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_COMMAND ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner, or when a keystroke has been Γöé Γöé Γöétranslated by an accelerator table Γöé Γöé Γöéinto WM_COMMAND. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 6. Frame Windows ΓòÉΓòÉΓòÉ A frame window is the basic window used by most Presentation Manager applications to enable the user to perform manipulation functions. This chapter explains how to create and use frame windows in PM applications. ΓòÉΓòÉΓòÉ 6.1. About Frame Windows ΓòÉΓòÉΓòÉ An application nearly always starts with a frame window to create a composite window (for example, a main window) that consists of the frame window, several frame-control windows, and a client window. The frame controls conform to the Common User Access (CUA) user interface guidlines. The frame window coordinates the actions of the frame controls and client window, enabling the composite window to act as a single unit. Frame windows have the preregistered public window class WC_FRAME. The frame-window class, like the preregistered control classes, defines the appearance and behavior of the frame window. ΓòÉΓòÉΓòÉ 6.1.1. Main Window ΓòÉΓòÉΓòÉ The main window of an application, typically, is composed of a frame window and a client window. The frame window usually includes control windows such as a title bar, system menu, menu bar (action bar or menu in user terminology), and scroll bars. The following figure is an example of a typical frame window. Typical Frame Window and Its Components A frame window provides the standard services the user expects from a window-for example, moving, sizing, minimizing, and maximizing. The frame window receives input from the control windows (called frame controls) and sends messages to both the frame controls and the client window. ΓòÉΓòÉΓòÉ 6.1.1.1. Frame Controls ΓòÉΓòÉΓòÉ When creating a frame window, an application also can create one or more frame controls as child windows of the frame window. Most frame windows contain at least a system menu and title bar. Other optional controls might include a menu bar and scroll bar as shown above. An application can create a frame window with specified frame controls by calling WinCreateStdWindow with the appropriate frame-control flags. The frame window owns the child frame-control windows, which can send notification messages that tell the frame window what the user is doing with the frame controls. For example, using a mouse, a user can move a window by clicking the title bar and dragging the window to a new position. The title-bar control responds to the click by sending a message to the frame window, notifying it of the user's request to move the window. Then the frame window tracks the mouse motion and moves the frame window and all of its child windows to the new position. PM, rather than the application, handles the processing of the frame controls, thus providing the user a consistent interface for manipulating and interacting with windowed applications on the screen. Frame controls are described in individual chapters. For more information about control windows, see Control Windows. ΓòÉΓòÉΓòÉ 6.1.1.2. Client Window ΓòÉΓòÉΓòÉ Every main window has a client window, which is the window in which the application displays output and receives mouse and keyboard input from the user. What an application displays in the client window, how it displays it, and how it interprets input to the window are controlled by the client's application-defined window procedure. An application creates the client window when it creates the frame window. The client window, which is specific to the application, is nearly always created using a private window class (a class registered by the application). Like a frame control, the client window is a child window and is owned by the frame window. This means, for example, that the client window is moved when the frame window moves, is clipped to the frame-window size, and is destroyed when the frame window is destroyed. The relationship between the frame window and the client window allows the frame window to pass messages between other frame controls and the client window. For example, a client window can send a message to the frame window requesting that the frame window change the window title. The frame window, in turn, sends a message to the title-bar control, telling it to change the title of the window. ΓòÉΓòÉΓòÉ 6.1.1.3. Additional Frame-Window Items ΓòÉΓòÉΓòÉ In addition to its frame controls, a frame window also can contain a sizing border and the minimize and maximize buttons (also known as maximize and minimize icons). These items are not frame controls, because the frame window draws and maintains them. (Frame controls are windows that draw and maintain themselves.) The sizing border encloses the frame window and lets the user change the size of the window using a mouse. The minimize button, at the right end of the title bar, lets the user reduce the frame window to an icon. The maximize button, to the right of the minimize button, lets the user enlarge the window so that it fills the screen. An application can add these items to a frame window by using the FCF_SIZEBORDER, FCF_MAXBUTTON, and FCF_MINBUTTON (or FCF_MINMAX) styles. (The FCF_MINMAX style adds both a maximize button and a minimize button.) ΓòÉΓòÉΓòÉ 6.1.1.4. Frame-Control Identifiers ΓòÉΓòÉΓòÉ A frame window uses a set of standard constants to identify the frame controls and the client window. The frame-control identifiers all begin with the prefix FID_ and can be used in functions such as WinWindowFromID to uniquely identify a given control or the client window. The frame controls also use these identifiers in notification messages sent to the frame window. The following table describes the frame-control identifiers: Frame-Control Identifiers ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéIdentifier ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFID_CLIENT ΓöéIdentifies a client window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFID_HORZSCROLL ΓöéIdentifies a horizontal scroll bar. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFID_MENU ΓöéIdentifies a menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFID_MINMAX ΓöéIdentifies the minimize and maximizeΓöé Γöé Γöé(window-sizing) buttons. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFID_SYSMENU ΓöéIdentifies a system menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFID_TITLEBAR ΓöéIdentifies a title bar. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFID_VERTSCROLL ΓöéIdentifies a vertical scroll bar. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 6.1.2. Frame-Window Creation ΓòÉΓòÉΓòÉ An application typically creates a frame window by using the WinCreateStdWindow function, which creates a frame window, a client window, and the specified frame controls. The application also can call WinCreateWindow with the WC_FRAME window class, which creates the frame window and controls but not the client window. To create the client, the application can call WinCreateWindow, specifying the original frame window as the parent and owner. An application also can use a frame window to create a dialog window. For a dialog window, the frame window contains control windows but no client window. The application creates the dialog window by using the WinLoadDlg or WinCreateDlg functions. These functions require an appropriate dialog template from the application's resource-definition file. The dialog template specifies the styles and dimensions for the frame window and for the control windows that compose the dialog window. ΓòÉΓòÉΓòÉ 6.1.2.1. Frame Window Controls and Styles ΓòÉΓòÉΓòÉ An application uses frame-control flags in the WinCreateStdWindow function to specify which frame controls to give to the frame window. Frame-control flags are constants that have the FCF_ prefix. The frame-window class (WC_FRAME), like other public window classes, provides many class-specific window styles that applications can use to adapt the appearance and behavior of a frame window. To specify the frame-window styles, an application can use either frame-control flags or the frame-window style constants, which have the FS_ prefix. Each style constant has a corresponding frame-control flag. Both produce exactly the same styles in a frame window. Typically, if an application is creating a frame window that uses frame controls, the application uses frame-control flags to specify the frame-window styles-if not, the application uses frame-style constants. An application can combine the frame-style constants with the standard window styles when creating a frame window. When an application calls WinCreateStdWindow without setting any frame-control flags, the function creates a standard window that is invisible and behind all its sibling windows, that has a width and height of 0, and that is positioned at the lower-left corner of its parent window. After the call to WinCreateStdWindow returns, the application can use the WinSetWindowPos function to change the window's size, coordinates, z-order position, and visibility. If an application calls WinCreateStdWindow with the FCF_SHELLPOSITION frame-control flag, the function creates the window so that it is in front of its sibling windows and has a standard size and coordinates determined by the system. ΓòÉΓòÉΓòÉ 6.1.2.2. Frame-Window Resources ΓòÉΓòÉΓòÉ If an application specifies FCF_ACCELTABLE, FCF_ICON, FCF_MENU, FCF_STANDARD, FS_ACCELTABLE, FS_ICON, or FS_STANDARD when creating a frame window, the application must provide the resources to support the specified style. Failure to do so causes the window creation to fail. Depending on the style, a frame window might attempt to load one or more resources from the application's executable files. The following table shows the frame-control flags and frame-window styles that require resources: Frame Window Flags and Styles Requiring Resources ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFlag ΓöéStyle ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFCF_ACCELTABLE ΓöéFS_ACCELTABLE ΓöéRequires an Γöé Γöé Γöé Γöéaccelerator-table Γöé Γöé Γöé Γöéresource. The frame Γöé Γöé Γöé Γöéwindow uses the Γöé Γöé Γöé Γöéaccelerator table toΓöé Γöé Γöé Γöétranslate WM_CHAR Γöé Γöé Γöé Γöémessages to Γöé Γöé Γöé ΓöéWM_COMMAND, WM_HELP,Γöé Γöé Γöé Γöéor WM_SYSCOMMAND Γöé Γöé Γöé Γöémessages. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFCF_ICON ΓöéFS_ICON ΓöéRequires an icon Γöé Γöé Γöé Γöéresource. The frame Γöé Γöé Γöé Γöéwindow draws the Γöé Γöé Γöé Γöéicon when the user Γöé Γöé Γöé Γöéminimizes the Γöé Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFCF_MENU ΓöéFS_MENU ΓöéRequires a Γöé Γöé Γöé Γöémenu-template Γöé Γöé Γöé Γöéresource. A frame Γöé Γöé Γöé Γöéwindow uses the menuΓöé Γöé Γöé Γöétemplate to create aΓöé Γöé Γöé Γöémenu containing the Γöé Γöé Γöé Γöécommands and menus Γöé Γöé Γöé Γöéspecified by the Γöé Γöé Γöé Γöéresource. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFCF_STANDARD ΓöéFS_STANDARD ΓöéRequires a Γöé Γöé Γöé Γöémenu-template Γöé Γöé Γöé Γöéresource Γöé Γöé Γöé Γöé(FCF_STANDARD only),Γöé Γöé Γöé Γöéan accelerator-tableΓöé Γöé Γöé Γöéresource, and an Γöé Γöé Γöé Γöéicon resource. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ You can use the resource compiler to add icon, menu, and accelerator-table resources to the application's executable file. Each resource must have a resource identifier that matches the resource identifier specified in the FRAMECDATA structure passed to the WinCreateWindow function, or in the idResources parameter of the WinCreateStdWindow function. Note: For detailed information about icon, menu, and accelerator-table resources, see Mouse Pointers and Icons, Menus, and Keyboard Accelerators respectively. The following sample code illustrates how to use WinCreateStdWindow to load and set up certain resources for a frame window. Normally the first step is to set up a header file defining the the IDs of the applicable resources: #define ID_RESOURCE 001 #define IDM_OPTIONS 50 #define IDM_SHIFT 51 #define IDM_EXIT 52 Defining Resources for Header File Then, make a resource (.RC) file, defining each resource: /* Sample Resource */ #include <os2.h> POINTER ID_RESOURCE sampres.ico /* Icon */ ACCELTABLE ID_RESOURCE BEGIN /* Accelerator table */ VK_F10, IDM_SHIFT, VIRTUALKEY VK_F3 , IDM_EXIT, VIRTUALKEY END MENU ID_RESOURCE /* Menu */ BEGIN SUBMENU "~Options", IDM_OPTIONS BEGIN MENUITEM "~Shift Colors\tF10", IDM_SHIFT MENUITEM "~Exit\tF3", IDM_EXIT END END Defining Resources for Resource (.RC) File When using WinCreateStdWindow with more than one resource, each resource can have the same ID, as in the above example (ID_RESOURCE or 1), but only if each resource is of a different type. Resources of the same type must have unique IDs. Use FCF flags to indicate what resources to load: ULONG flFrameFlags= FCF_TITLEBAR | /* Title bar */ FCF_SIZEBORDER | /* Size border */ FCF_MINMAX | /* Min & Max buttons */ FCF_SYSMENU | /* System menu */ FCF_SHELLPOSITION | /* System size & position */ FCF_TASKLIST | /* Add name to task list */ FCF_ICON | /***Add icon */ FCF_ACCELTABLE | /***Add accel. table */ FCF_MENU ; /***Add menu */ Using FCF Flags to Indicate What Resources to Load Use 0 (or NULL) in the seventh parameter of WinCreateStdWindow to indicate that the resource is stored in the application file, as follows: hwndFrame = WinCreateStdWindow( HWND_DESKTOP, /* Parent is desktop window. */ WS_VISIBLE, /* Make frame window visible. */ &flFrameFlags, /* Frame controls */ "ResSamClient", /* Window class for client */ NULL, /* No window title */ WS_VISIBLE, /* Make client window visible . */ (HMODULE) 0, /* Resources in application module */ ID_RESOURCE, /* Resource identifier */ NULL); /* Pointer to client window handle */ Indicating that a Resource is Stored in the Application File Following is the full listing of the sample program: SampleProgramforLoadingResourcesinaFrameWindow #define INCL_PM #include <os2.h> MRESULT EXPENTRY ClientWndProc(HWND hwnd,ULONG msg,MPARAM mp1,MPARAM mp2); int main(int argc, char *argv, char *envp) { HWND hwndFrame; HWND hwndClient; HMQ hmq; QMSG qmsg; HAB hab; ULONG flFrameFlags= FCF_TITLEBAR | /* Title bar */ FCF_SIZEBORDER | /* Size Border */ FCF_MINMAX | /* Min & Max Buttons */ FCF_SYSMENU | /* System Menu */ FCF_SHELLPOSITION | /* System size & position */ FCF_TASKLIST | /* Add name to task list. */ FCF_ICON | /***Add icon. */ FCF_ACCELTABLE | /***Add accelerator table. */ FCF_MENU; /***Add menu. */ hab = WinInitialize(0); hmq = WinCreateMsgQueue(hab, 0); WinRegisterClass( hab, /* Anchor block handle */ "ResSamClient", /* Name of class being registered */ (PFNWP)ClientWndProc, /* Window procedure for class */ CS_SIZEREDRAW | /* Class style */ CS_HITTEST, /* Class style */ 0); /* Extra bytes to reserve */ hwndFrame = WinCreateStdWindow( HWND_DESKTOP, /* Parent is desktop window. */ WS_VISIBLE, /* Make frame window visible. */ &flFrameFlags, /* Frame controls */ "ResSamClient", /* Window class for client */ NULL, /* No window title */ WS_VISIBLE, /* Make client window visible . */ (HMODULE) 0, /* Resources in application module */ ID_RESOURCE, /* Resource identifier */ NULL); /* Pointer to client window handle */ while (WinGetMsg(hab, &qmsg, 0, 0, 0)) WinDispatchMsg(hab, &qmsg); WinDestroyWindow(hwndFrame); WinDestroyMsgQueue(hmq); WinTerminate(hab); return 0; } MRESULT EXPENTRY ClientWndProc(HWND hwnd,ULONG msg,MPARAM mp1,MPARAM mp2) { RECTL rcl; HPS hps; static LONG lColor=CLR_RED; switch (msg) { case WM_PAINT: hps=WinBeginPaint(hwnd,(HPS) NULL, &rcl); /* Get hps */ WinFillRect(hps,&rcl,lColor); /* Fill the window */ WinEndPaint(hps); /* Free hps */ return 0; case WM_COMMAND: switch (SHORT1FROMMP(mp1)) { case IDM_SHIFT: /* Shift selected */ if (lColor==CLR_RED) lColor=CLR_BLUE; /* Change the */ else lColor=CLR_RED; /* color */ WinInvalidateRect(hwnd,(PRECTL)NULL,0UL); /* Paint Window */ return 0; case IDM_EXIT: /* Exit selected */ WinPostMsg(hwnd,WM_CLOSE,MPVOID,MPVOID); /* Exit program. */ return 0; } } return WinDefWindowProc (hwnd, msg, mp1, mp2); } ΓòÉΓòÉΓòÉ 6.1.3. Frame-Window Class Data ΓòÉΓòÉΓòÉ An application can specify class-specific data for a frame window by passing to the WinCreateWindow function a pointer to the FRAMECDATA structure. The class-specific data contains the frame-control flags (FCF_ flags), resource-module handle, and resource identifier to be used when creating the frame window. The resource-module handle and the resource identifier specify where to find resources for the frame window. Supplying class-specific data with WinCreateWindow is similar to using the WinCreateStdWindow function without creating a client window. ΓòÉΓòÉΓòÉ 6.1.4. Frame-Window Data ΓòÉΓòÉΓòÉ Frame-window data specifies the state of the frame window at a given time. An application can retrieve the frame-window data by calling the WinQueryWindowUShort function. A frame window has the following state flags: Frame Window State Flags and Their Meanings ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFlag ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_ACTIVE ΓöéIndicates that the frame window is Γöé Γöé Γöéactive. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_DLGDISMISSED ΓöéIndicates that a dialog window has Γöé Γöé Γöébeen dismissed by a call to the Γöé Γöé ΓöéWinDismissDlg function. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_FLASHHILITE ΓöéIndicates that the frame window is Γöé Γöé Γöéflashing and its flash state is Γöé Γöé ΓöéTRUE. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_FLASHWINDOW ΓöéIndicates that the frame window Γöé Γöé Γöéflashes as the result of either a Γöé Γöé Γöécall to the WinFlashWindow function Γöé Γöé Γöéor a WM_FLASHWINDOW message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_NOACTIVATESWP ΓöéIndicates that the system should do Γöé Γöé Γöéno z-ordering on this frame window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_OWNERDISABLE ΓöéFor a frame window that is part of aΓöé Γöé Γöédialog window, this flag indicates Γöé Γöé Γöéwhether the owner window was enabledΓöé Γöé Γöéor disabled when the dialog window Γöé Γöé Γöéwas loaded. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_OWNERHIDDEN ΓöéIndicates that the frame window's Γöé Γöé Γöéowner window is hidden or minimized,Γöé Γöé Γöéin which case the frame window also Γöé Γöé Γöéis hidden. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFF_SELECTED ΓöéIndicates that the frame window has Γöé Γöé Γöébeen selected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFI_ACTIVATEOK ΓöéIndicates that the window can be Γöé Γöé Γöéactivated. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFI_FRAME ΓöéIndicates that the window is a frameΓöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFI_NOMOVEWITHOWNER ΓöéIndicates that the window should Γöé Γöé Γöémove when its owner window moves. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFI_OWNERHIDE ΓöéIndicates that the frame window Γöé Γöé Γöéshould be hidden or shown as a Γöé Γöé Γöéresult of its owner window being Γöé Γöé Γöéhidden, shown, minimized, or Γöé Γöé Γöémaximized. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 6.1.5. Frame-Window Operation ΓòÉΓòÉΓòÉ The frame window maintains the size, position, and visibility of itself, its frame controls, and its client window. The frame window responds to user requests to move, size, minimize, maximize, and redraw itself. It also responds to requests to close (destroy) itself and to change the focus and activation state. The frame window, when being moved or sized, maintains the position of each owned window relative to its owner window's lower-left corner. Whenever the frame window redraws itself (for example, after being moved or sized), it draws the frame controls and then lets the application draw the client window. This order ensures that the rapidly drawn frame controls are drawn before the client window. The order in which the frame controls are drawn depends on the z-order position of the controls. The following list specifies the z-order position of the frame controls (from top to bottom): FID_SYSMENU FID_TITLEBAR FID_MENU FID_VERTSCROLL FID_HORZSCROLL FID_CLIENT Although an application can change the z-order position of any window, changing the relative positions of frame controls is not recommended. When the user maximizes the frame window, the size of the frame window increases to the size of its parent window, plus an additional amount on each of its four sides equal to the width of its sizing border. A window always is clipped to its parent window; a maximized standard frame window does not show its sizing border in its normal maximized position. Frame controls owned by a frame window or windows owned by child windows of a frame window are destroyed automatically when the frame window processes the WM_DESTROY message. ΓòÉΓòÉΓòÉ 6.1.6. Nonstandard Frame Windows ΓòÉΓòÉΓòÉ Although most applications use frame windows to create their main windows and dialog windows, they are not limited to frame windows. Applications can create nonstandard frame windows and still use the standard frame controls, such as the title bar and system menu, within the nonstandard windows. An application can create a nonstandard frame window either by subclassing a frame window or by creating a private frame-window class. An application that subclasses a frame window can intercept the messages sent to the window and process them in new ways. An application that creates private frame-window classes essentially rewrites the frame-window procedure. In either case, by creating nonstandard frame windows, the application gains much more control over the arrangement of frame controls in the frame window. The messages WM_FORMATFRAME, WM_UPDATEFRAME, and WM_CALCVALIDRECTS control the arrangement of frame controls for applications that subclass the frame-window procedure. By intercepting these messages, an application can rearrange the frame controls in a frame window. To maintain the size and position of frame controls, an application that creates private frame-window classes can use the WinCreateFrameControls and WinCalcFrameRect functions. These functions provide capabilities that are similar to those provided by frame windows. ΓòÉΓòÉΓòÉ 6.1.7. Default Frame-Window Behavior ΓòÉΓòÉΓòÉ The following table lists all the messages specifically handled by the window procedure of the predefined frame-window class (WC_FRAME) and describes how the window procedure responds to each message. Default Frame-Window Messages and Behavior ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ACTIVATE ΓöéSets the highlighted state of the Γöé Γöé Γöétitle bar or border so that it Γöé Γöé Γöématches the frame window's Γöé Γöé Γöéactivation state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéIf the frame window is minimized, Γöé Γöé Γöécaptures the mouse; otherwise, Γöé Γöé Γöéactivates the frame window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DOWN ΓöéActivates the frame window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DOWN ΓöéActivates the frame window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1UP ΓöéProcesses messages from minimized Γöé Γöé Γöéwindow frames. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéIf the frame window is minimized, Γöé Γöé Γöéposts a WM_SYSCOMMAND message to Γöé Γöé Γöéitself; otherwise, activates the Γöé Γöé Γöéframe window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CALCVALIDRECTS ΓöéIf the frame window has no client Γöé Γöé Γöéwindow or if the client window has Γöé Γöé Γöéthe CS_SIZEREDRAW style, returns theΓöé Γöé ΓöéCVR_REDRAW flag to invalidate the Γöé Γöé Γöéentire window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CLOSE ΓöéIf the frame window has a client Γöé Γöé Γöéwindow, passes this message to the Γöé Γöé Γöéclient; otherwise, returns the Γöé Γöé Γöéresult of the WinDefWindowProc Γöé Γöé Γöéfunction. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéCreates the specified frame controlsΓöé Γöé Γöéby calling the Γöé Γöé ΓöéWinCreateFrameControls function. Γöé Γöé ΓöéAlso creates any accelerator tables,Γöé Γöé Γöéloads icons, and adds itself to the Γöé Γöé ΓöéWindow List. These actions depend onΓöé Γöé Γöéthe frame-window styles and Γöé Γöé Γöéframe-control flags specified for Γöé Γöé Γöéthe window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéIf the focus is held by a child Γöé Γöé Γöéwindow of the frame window, sets theΓöé Γöé Γöéfocus to the frame window's parent Γöé Γöé Γöéwindow, destroys any owned windows Γöé Γöé Γöéor child windows, destroys any iconsΓöé Γöé Γöécreated by using the FS_ICON style, Γöé Γöé Γöéand destroys any accelerator tables Γöé Γöé Γöécreated by using the FS_ACCELTABLE Γöé Γöé Γöéstyle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéReturns the result of the Γöé Γöé ΓöéWinDefWindowProc function. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ERASEBACKGROUND ΓöéReturns TRUE, signaling that the Γöé Γöé Γöéwindow should erase the Γöé Γöé Γöéclient-window area. The frame windowΓöé Γöé Γöésends this message to itself during Γöé Γöé ΓöéWM_PAINT processing. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_FORMATFRAME ΓöéCalculates the sizes and positions Γöé Γöé Γöéof the frame controls and the clientΓöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HITTEST ΓöéIf the frame window is minimized andΓöé Γöé Γöédisabled, returns HT_ERROR; Γöé Γöé Γöéotherwise, returns TF_MOVE. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MINMAXFRAME ΓöéIf the frame window has a client Γöé Γöé Γöéwindow, passes this message to the Γöé Γöé Γöéclient window; otherwise, passes Γöé Γöé Γöéthis message to the WinDefWindowProcΓöé Γöé Γöéfunction. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéDetermines the correct mouse pointerΓöé Γöé Γöéto use and returns the result of Γöé Γöé ΓöéWinDefWindowProc. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéIf the frame window is minimized, Γöé Γöé Γöésends WM_QUERYICON and Γöé Γöé ΓöéWM_ERASEBACKGROUND to itself and Γöé Γöé Γöédraws the icon; otherwise, paints Γöé Γöé Γöéthe control windows, sends a Γöé Γöé ΓöéWM_ERASEBACKGROUND message to the Γöé Γöé Γöéclient window, and paints the clientΓöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYTRACKINFO ΓöéStarts track-move processing of the Γöé Γöé Γöétitle-bar control window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SHOW ΓöéReturns the result of Γöé Γöé ΓöéWinDefWindowProc. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SIZE ΓöéSends a WM_FORMATFRAME message to Γöé Γöé Γöéitself. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SYSCOMMAND ΓöéIf the frame window has captured theΓöé Γöé Γöémouse, ignores the system command; Γöé Γöé Γöéotherwise, uses one of the followingΓöé Γöé Γöécommands: SC_APPMENU, SC_CLOSE, Γöé Γöé ΓöéSC_MOVE, SC_NEXT, SC_NEXTFRAME, Γöé Γöé ΓöéSC_RESTORE, SC_SIZE, SC_SYSMENU, Γöé Γöé ΓöéSC_TASKMANAGER. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_UPDATEFRAME ΓöéReformats and updates the appearanceΓöé Γöé Γöéof the frame window. Sent after a Γöé Γöé Γöéframe control has been added to or Γöé Γöé Γöéremoved from the frame window. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 6.2. Using Frame Windows ΓòÉΓòÉΓòÉ This section explains how to: o Create a main window o Retrieve a frame-control handle. ΓòÉΓòÉΓòÉ 6.2.1. Creating a Main Window ΓòÉΓòÉΓòÉ An application can create a main window by using the WinCreateStdWindow function. The following code fragment creates a typical main window-a frame window that has a system menu, title bar, menu, vertical and horizontal scroll bars, minimize and maximize (window-sizing) buttons, and a sizing border: #define IDM_MENU 1 HWND hwndFrame; ULONG flFrameControlFlags = FCF_SYSMENU | FCF_TITLEBAR | FCF_SIZEBORDER | FCF_MENU | FCF_MINMAX | FCF_HORZSCROLL | FCF_VERTSCROLL | FCF_SHELLPOSITION; hwndFrame = WinCreateStdWindow( HWND_DESKTOP, /* Frame-window parent */ WS_VISIBLE, /* Make window visible */ &flFrameControlFlags, /* Frame-control flags */ "MyClass", /* Client-window class */ "Main Window", /* Window title */ 0, /* No client-window styles */ (HMODULE)NULL, /* App. module has resources */ IDM_MENU, /* Resource ID */ 0); /* Client-window handle */ An application also can create a standard main window by creating a frame window with the FCF_STANDARD flag. The application must include icon, menu, and accelerator-table resources if it uses the FCF_STANDARD flag. The application creates the standard window by using the WinCreateStdWindow function, as shown in the following code fragment: #define IDM_RESOURCES 1 HWND hwndFrame; /* Set the frame-control flags. */ ULONG flFrameControlFlags = FCF_STANDARD; /* Create the standard main window. */ hwndFrame = WinCreateStdWindow(HWND_DESKTOP, WS_VISIBLE, &flFrameControlFlags, "MyClass", "Main Window", 0, (HMODULE) NULL, IDM_RESOURCES, 0); Another way to create a main window and its frame controls is to use the WinCreateWindow function to create the frame window and the frame controls, then call WinCreateWindow again to create the client window. One advantage of this approach is that, when creating the frame window, the application can specify the window's initial size and position. The following figure illustrates this approach: UsingWinCreateWindowtoCreateFrame ,Control ,andClientWindows #define ID_RESOURCES 1 #define ID_FRAME 1 ULONG flFrameControlFlags = FCF_ACCELTABLE | FCF_ICON | FCF_MENU | FCF_MINMAX | FCF_SIZEBORDER | FCF_SYSMENU | FCF_TASKLIST | FCF_TITLEBAR; FRAMECDATA fcdata; HWND hwndFrame; HWND hwndClient; SWP swp; fcdata.cb = sizeof(FRAMECDATA); fcdata.flCreateFlags = flFrameControlFlags; fcdata.hmodResources = (HMODULE) NULL; fcdata.idResources = ID_RESOURCES; /* Create the frame and client windows. */ hwndFrame = WinCreateWindow( HWND_DESKTOP, /* Frame-window parent */ WC_FRAME, /* Frame-window class */ "Main Window", /* Window title */ 0, /* Initially invisible */ 0,0,0,0, /* Size and position = 0 */ NULL, /* No owner */ HWND_TOP, /* Top z-order position */ ID_FRAME, /* Frame-window ID */ &fcdata, /* Pointer to class data */ NULL); /* No presentation parameters */ hwndClient = WinCreateWindow( hwndFrame, /* Client-window parent */ "MyClass", /* Client-window class */ NULL, /* No title for client window */ 0, /* Initially invisible */ 0,0,0,0, /* Size and position = 0 */ hwndFrame, /* Owner is frame window */ HWND_BOTTOM, /* Bottom z-order position */ FID_CLIENT, /* Standard client-window ID */ NULL, /* No class data */ NULL); /* No presentation parameters */ . . /* Continue with initialization. */ . /* Set the size and position of the frame window. */ WinQueryWindowPos(HWND_DESKTOP, &swp); WinSetWindowPos(hwndFrame, HWND_TOP, swp.x, swp.cy / 2, swp.cx, swp.cy / 2, SWP_MOVE | SWP_SIZE); /* Set the size and position of the client window. */ WinQueryWindowPos(hwndFrame, &swp); WinSetWindowPos(hwndClient, HWND_TOP, SV_CXSIZEBORDER, SV_CYSIZEBORDER - 1, swp.cx - SV_CXSIZEBORDER * 2, (swp.cy - SV_CYSIZEBORDER * 2) + 1, SWP_MOVE | SWP_SIZE); /* Make the frame and client windows visible. */ WinShowWindow(hwndFrame, TRUE); WinShowWindow(hwndClient, TRUE); ΓòÉΓòÉΓòÉ 6.2.2. Retrieving a Frame Handle ΓòÉΓòÉΓòÉ An application can retrieve a frame-control handle by using the WinWindowFromID function. The following code fragment retrieves the handle of a title-bar control: HWND hwndTitleBar,hwndFrame; hwndTitleBar = WinWindowFromID(hwndFrame, FID_TITLEBAR); Given a frame-control handle, an application can retrieve its parent frame-window handle by using the WinQueryWindow function: HWND hwndFrame,hwndTitleBar; hwndFrame = WinQueryWindow(hwndTitleBar, QW_PARENT); By using identifiers to identify frame controls, rather than using window classes, an application can create its own controls to replace the predefined controls. ΓòÉΓòÉΓòÉ 6.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions, structures, and messages used with frame windows. Frame-Window Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCalcFrameRect ΓöéCalculates a client rectangle from aΓöé Γöé Γöéframe rectangle or a frame rectangleΓöé Γöé Γöéfrom a client rectangle. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Frame-Window Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFRAMECDATA ΓöéFrame-control data structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéHSVWP ΓöéFrame window repositioning handle. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Frame-Window Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ACTIVATE ΓöéOccurs when an application Γöé Γöé Γöécauses the activation or Γöé Γöé Γöédeactivation of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéOccurs when the user presses Γöé Γöé Γöépointer button 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DOWN ΓöéOccurs when the user presses Γöé Γöé Γöépointer button 2. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DOWN ΓöéOccurs when the user presses Γöé Γöé Γöépointer button 3. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1UP ΓöéOccurs when the user releases Γöé Γöé Γöépoint button 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CALCVALIDRECTS ΓöéSent to determine which areas Γöé Γöé Γöéof a window can be preserved Γöé Γöé Γöéand which can be displayed Γöé Γöé Γöéwhen a window is sized. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CLOSE ΓöéSent to a frame window to Γöé Γöé Γöéindicate that the user is Γöé Γöé Γöéclosing the window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéOccurs when the application Γöé Γöé Γöérequests creation of a window.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéOccurs when an application Γöé Γöé Γöérequests destruction of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéSets the enable state of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ERASEBACKGROUND ΓöéCauses a client window to be Γöé Γöé Γöéfilled with the background, ifΓöé Γöé Γöéappropriate. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_FLASHWINDOW ΓöéOccurs when an application hasΓöé Γöé Γöéissued a WinFlashWindow call. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_FOCUSCHANGE ΓöéOccurs when the window Γöé Γöé Γöépossessing the focus is Γöé Γöé Γöéchanged. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_FORMATFRAME ΓöéSent to a frame window to Γöé Γöé Γöécalculate the sizes and Γöé Γöé Γöépositions of all the frame Γöé Γöé Γöécontrols and the client Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HITTEST ΓöéSent to determine which windowΓöé Γöé Γöéis associated with an input Γöé Γöé Γöéfrom the pointing device. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MINMAXFRAME ΓöéSent to a frame window that isΓöé Γöé Γöébeing minimized, maximized, orΓöé Γöé Γöérestored. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéOccurs when the pointing Γöé Γöé Γöédevice pointer moves. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_NEXTMENU ΓöéOccurs when either the Γöé Γöé Γöébeginning or the end of the Γöé Γöé Γöémenu is reached using the Γöé Γöé Γöécursor control keys. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéOccurs when a window needs Γöé Γöé Γöépainting. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYFRAMECTLCOUNT ΓöéSent to the frame window in Γöé Γöé Γöéresponse to the receipt of a Γöé Γöé ΓöéWM_SIZE or WM_UPDATEFRAME Γöé Γöé Γöémessage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYFRAMEINFO ΓöéEnables an application to Γöé Γöé Γöéquery information about frame Γöé Γöé Γöéwindows. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYICON ΓöéSent to a frame window to Γöé Γöé Γöéquery its associated icon. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYTRACKINFO ΓöéThe frame control and title Γöé Γöé Γöébar generate this message Γöé Γöé Γöéafter receiving a Γöé Γöé ΓöéWM_TRACKFRAME message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETACCELTABLE ΓöéEstablishes the window Γöé Γöé Γöéaccelerator table to be used Γöé Γöé Γöéfor translation when the Γöé Γöé Γöéwindow is active. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETBORDERSIZE ΓöéSent to the frame window to Γöé Γöé Γöéchange the width and height ofΓöé Γöé Γöéthe border. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETICON ΓöéSent to a frame window to set Γöé Γöé Γöéits associated icon. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SHOW ΓöéOccurs when a window's Γöé Γöé ΓöéWS_VISIBLE state is changing. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SIZECLIPBOARD ΓöéSent when the clipboard Γöé Γöé Γöécontains a data handle for theΓöé Γöé ΓöéCFI_OWNERDISPLAY format, and Γöé Γöé Γöéthe clipboard application Γöé Γöé Γöéwindow has changed size. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SYSCOMMAND ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify toΓöé Γöé Γöéits owner or when a keystroke Γöé Γöé Γöéhas been translated by an Γöé Γöé Γöéaccelerator table into a Γöé Γöé ΓöéWM_SYSCOMMAND message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TRACKFRAME ΓöéSent to a window whenever it Γöé Γöé Γöéis to be moved or sized. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TRANSLATEACCEL ΓöéSent to the focus window Γöé Γöé Γöéwhenever a WM_CHAR message Γöé Γöé Γöéoccurs. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_UPDATEFRAME ΓöéSent by an application after Γöé Γöé Γöéframe controls have been addedΓöé Γöé Γöéor removed from the window Γöé Γöé Γöéframe. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_WINDOWPOSCHANGED ΓöéSent to the window procedure Γöé Γöé Γöéof the window whose position Γöé Γöé Γöéis changed. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 7. Control Windows ΓòÉΓòÉΓòÉ A control window is a window that an application uses in conjunction with another window to carry out simple input and output tasks. This chapter describes how to create and use control windows in PM applications. ΓòÉΓòÉΓòÉ 7.1. About Control Windows ΓòÉΓòÉΓòÉ Control windows are used most often as part of a frame or dialog window, but they also can be used in a client window. An application can create control windows in a frame window by using frame-control flags in the WinCreateStdWindow function, or it can create control windows individually by calling the WinCreateWindow function. Including control windows in a dialog window requires the use of a dialog template, which is a data structure that describes a dialog window and its control windows. The system uses the data in the dialog template to create the dialog window and control windows. An application can create a dialog template at run time, or it can use the system resource compiler to create a dialog-template resource. The operating system provides many types of predefined control windows. An application can create a control of a particular type by specifying the appropriate control-window class name, either in the WinCreateWindow function or in a dialog template. The following is a list of the predefined control-window classes: Control Window Classes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéClass name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_BUTTON ΓöéConsists of buttons and boxes the user can Γöé Γöé Γöéselect by clicking the pointing device or Γöé Γöé Γöéusing the keyboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_COMBOBOX ΓöéCreates a combination-box control, which Γöé Γöé Γöécombines a list-box control and an Γöé Γöé Γöéentry-field control. It allows the user to Γöé Γöé Γöéenter data by typing in the entry field or Γöé Γöé Γöéchoosing from a list in the list box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_CONTAINER ΓöéCreates a control for the user to group Γöé Γöé Γöéobjects in a logical manner. A container canΓöé Γöé Γöédisplay those objects in various formats or Γöé Γöé Γöéviews. The container control supports drag Γöé Γöé Γöéand drop so the user can place information inΓöé Γöé Γöéa container by simply dragging and dropping. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_ENTRYFIELD ΓöéConsists of a single line of text that the Γöé Γöé Γöéuser can edit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_FRAME ΓöéA composite window class that can contain Γöé Γöé Γöéchild windows of many of the other window Γöé Γöé Γöéclasses. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_LISTBOX ΓöéPresents a list of text items from which the Γöé Γöé Γöéuser can make selections. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_MENU ΓöéPresents a list of items that can be Γöé Γöé Γöédisplayed horizontally as action bars, or Γöé Γöé Γöévertically as pull-down menus. Menus usuallyΓöé Γöé Γöéare used to provide a command interface to Γöé Γöé Γöéapplications. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_NOTEBOOK ΓöéCreates a control for the user that is Γöé Γöé Γöédisplayed as a number of pages. The top pageΓöé Γöé Γöéis visible, and the others are hidden, with Γöé Γöé Γöétheir presence being indicated by a visible Γöé Γöé Γöéedge on each of the back pages. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SCROLLBAR ΓöéConsists of window scroll bars that let the Γöé Γöé Γöéuser request to scroll the contents of an Γöé Γöé Γöéassociated window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SLIDER ΓöéCreates a control that is usable for Γöé Γöé Γöéproducing approximate (analog) values or Γöé Γöé Γöéproperties. Scroll bars were used for this Γöé Γöé Γöéfunction in the past, but the slider providesΓöé Γöé Γöéa more flexible method of achieving the same Γöé Γöé Γöéresult, with less programming effort. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_SPINBUTTON ΓöéCreates a control that presents itself to theΓöé Γöé Γöéuser as a scrollable ring of choices, giving Γöé Γöé Γöéthe user quick access to the data. The user Γöé Γöé Γöéis presented only one item at a time, so the Γöé Γöé Γöéspin button should be used with data that is Γöé Γöé Γöéintuitively related. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_STATIC ΓöéSimple display items that do not respond to Γöé Γöé Γöékeyboard or pointing device events. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_TITLEBAR ΓöéDisplays the window title or caption and letsΓöé Γöé Γöéthe user move the window's owner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWC_VALUESET ΓöéCreates a control similar in function to the Γöé Γöé Γöéradio buttons but provides additional Γöé Γöé Γöéflexibility to display graphical, textual, Γöé Γöé Γöéand numeric formats. The values set with Γöé Γöé Γöéthis control are mutually exclusive. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ A control window is always owned by another window, usually a frame or dialog window. This relationship is important because a control window sends WM_CONTROL messages to its owner whenever an input event occurs in the control window. Each WM_CONTROL message includes the identifier of the control window in which the event occurred and a notification code that specifies the nature of the event. An application specifies a control window's ID either in the WinCreateWindow function or in a dialog template. Each ID must be unique. Control windows are like other predefined window classes in that they respond to standard window-management messages and functions, such as WinSetWindowText and WinShowWindow. All control-window classes have a set of specific messages they send and receive. The summary at the end of this chapter lists the messages that all control windows have in common. The system paints most control windows synchronously-that is, it redraws a control window as soon as any part of that window becomes invalid. ΓòÉΓòÉΓòÉ 7.2. Using Control Windows ΓòÉΓòÉΓòÉ An application can use control windows in a dialog window, standard frame window, or client window. The following sections describe how to use control windows in an application. ΓòÉΓòÉΓòÉ 7.2.1. Using Control Windows in a Dialog Window ΓòÉΓòÉΓòÉ To use a control window in a dialog window, an application specifies the control in a dialog template in the application's resource-definition file. A dialog template typically includes several control windows. When the application loads the dialog-template resource and displays the dialog window, the system automatically displays the control windows as part of the dialog window. An application can send messages, through the dialog-window procedure, to a control window to change its state. The control window sends notification messages to the dialog-window procedure. The content of a notification message depends on the type of control window. ΓòÉΓòÉΓòÉ 7.2.2. Using Control Windows in a Non-Dialog Window ΓòÉΓòÉΓòÉ To use a control window in a non-dialog window, an application must call the WinCreateWindow function, using the appropriate window class name. An application usually specifies one of its client windows as the owner of the control window. Therefore, the client-window procedure receives notification messages from the control window. In cases where a control is owned by the frame window (such as a menu control), the notification messages to the frame window are passed to the client window. ΓòÉΓòÉΓòÉ 7.2.3. Creating a Custom Control Window ΓòÉΓòÉΓòÉ The operating system provides the following three ways to create custom control windows: o Use ownerdraw list boxes and menus or buttons. o Subclass an existing control-window class. o Register and implement a window class from scratch. List boxes and menus can have an ownerdraw style, and buttons can have a user-button style, which cause the system to send a message to the owner of the ownerdraw control whenever the control must be drawn. (If the owner is a frame window, it sends these messages on to its client windows for handling by the client window procedure.) This feature lets an application alter the appearance of a control window. For menus and list boxes, the owner window draws the items within the control, and the system draws the outline of the control. For buttons, the user-button style affects the drawing of the entire control. Subclassing an existing control window is an easy way to create a custom control. The subclass procedure can alter selected behavior of the control window by processing only those messages that affect the selected behaviors. All other messages pass to the original control-window procedure. The techniques for defining a custom control-window class are the same as those used for creating a client-window class. When you create a custom control-window class, be sure the window procedure can send and receive the messages listed in the following two tables. If an application creates a private control-window class, the name of the private class could be used in the dialog template, just like a predefined window-class constant. For example, if an application defines and registers a window class called "MyControlClass", it could create a dialog window that contains that type of control window by using the following resource definition: DLGTEMPLATE IDD_CUSTOM_TEST BEGIN DIALOG "", IDD_CUSTOM_TEST, 1, 1, 126, 130, FS_DLGBORDER, 0 BEGIN CONTROL "This is Text", IDD_TITLE, 37, 107, 56, 12, WC_STATIC, SS_TEXT | DT_CENTER | DT_TOP | DT_WORDBREAK | WS_VISIBLE CONTROL "Custom Control", IDD_CUSTOM, 33, 68, 64, 13, "MyControlClass", WS_VISIBLE CONTROL "Okay", DID_OK, 57, 10, 24, 14, WC_BUTTON, BS_PUSHBUTTON | BS_DEFAULT | WS_TABSTOP | WS_VISIBLE END END ΓòÉΓòÉΓòÉ 7.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 messages used with control windows. Messages Received by a Control Window ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ADJUSTWINDOWPOS ΓöéSent by WinSetWindowPos to Γöé Γöé Γöéenable the window to adjust Γöé Γöé Γöéits new position or size when Γöé Γöé Γöéit is about to be moved. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYDLGCODE ΓöéSent by the dialog manager to Γöé Γöé Γöéidentify the type of control, Γöé Γöé Γöéto determine what kinds of Γöé Γöé Γöémessages the control Γöé Γöé Γöéunderstands, and to determine Γöé Γöé Γöéwhether an input message may Γöé Γöé Γöébe processed by the dialog Γöé Γöé Γöémanager or passed down to the Γöé Γöé Γöécontrol. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Generated by a Control Window to its Owner ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_COMMAND ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify toΓöé Γöé Γöéits owner, or when a keystrokeΓöé Γöé Γöéhas been translated by an Γöé Γöé Γöéaccelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to a control's owner Γöé Γöé Γöéwindow when the pointing Γöé Γöé Γöédevice pointer moves over the Γöé Γöé Γöécontrol window, allowing the Γöé Γöé Γöéowner to set the pointer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HELP ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify toΓöé Γöé Γöéits owner, or when a keystrokeΓöé Γöé Γöéhas been translated into a Γöé Γöé ΓöéWM_HELP message by an Γöé Γöé Γöéaccelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SYSCOMMAND ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify toΓöé Γöé Γöéits owner, or when a keystrokeΓöé Γöé Γöéhas been translated into a Γöé Γöé ΓöéWM_SYSCOMMAND message by an Γöé Γöé Γöéaccelerator table. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 8. Button Controls ΓòÉΓòÉΓòÉ A button is a type of control window used to initiate an operation or to set the attributes of an operation. This chapter describes how to create and use buttons in PM applications. ΓòÉΓòÉΓòÉ 8.1. About Button Controls ΓòÉΓòÉΓòÉ A button control can appear alone or with a group of other buttons. When buttons are grouped, the user can move from button to button within the group by pressing the Arrow keys. The user also can move among groups by pressing the Tab key. A user can select a button by clicking it with the mouse, pressing the spacebar when the button has the keyboard focus, or sending a BM_CLICK message. In most cases, a button changes its appearance when selected. A button control is always owned by another window, usually a dialog window or an application's client window. A button control posts WM_COMMAND messages or sends WM_CONTROL notification messages to its owner when a user selects the button. The owner window receives messages from a button control and can send messages to the button to alter its position, appearance, and enabled/disabled state. To use a button control in a dialog window, an application specifies the control in a dialog template in the application's resource-definition file. The application processes button messages in the dialog-window procedure. An application creates a button control in a client window by calling WinCreateWindow, specifying a window class of WC_BUTTON, and identifying the client window as the owner of the button control. ΓòÉΓòÉΓòÉ 8.1.1. Button Types ΓòÉΓòÉΓòÉ There are four main types of buttons: push buttons, radio buttons, check boxes, and three-state check boxes. A button's type determines how the button looks and behaves. A radio button, check box, or three-state check box controls an operation; a push button initiates an operation. For example, a user might set printing options (such as paper size, print quality, and printer type) in a print-command dialog window containing an array of radio buttons and check boxes. After setting the options, the user would select a push button to tell an application that printing should begin (or be canceled). Then, the application would query the state of each check box and radio button to determine the printing parameters. A push button is a rectangular window that contains a text string, as shown in the following figure. Typically, an application uses a push button to let the user start or stop an operation. Push Button in a Dialog Box When selected, a push button control posts a WM_COMMAND message to its owner window. A radio button is a window with text displayed to the right of a small circular indicator. Each time the user selects a radio button, that button's state toggles between selected and unselected. This state remains until the next time the user selects the button. An application typically uses radio buttons in groups, as shown in the following figure. Radio Buttons in a Dialog Box Within a group, usually one button is selected by default, and the user can move the selection to another button by using the cursor keys; however, only one button can be selected at a time. Radio buttons are appropriate if an exclusive choice is required from a fixed list of related options. For example, applications often use radio buttons to allow the user to select the screen foreground and background colors. A radio-button control sends WM_CONTROL messages to its owner window. Check boxes are similar to radio buttons, except that they can offer multiple-choice selection as well as individual choice. Check boxes offer the user a fixed list of choices, with the option of selecting more than one, or even all. Check Boxes in a Dialog Box Check boxes also toggle application features on or off. For example, a word processing application might use a check box to let the user turn word wrapping on or off. A check-box control sends WM_CONTROL messages to its owner window. Three-state check boxes are similar to check boxes, except that they can be displayed in halftone as well as selected and unselected. An application might use the halftone state to indicate that, currently, the checkbox is not selectable. A three-state check-box control sends WM_CONTROL messages and posts WM_COMMAND messages to its owner window. In addition to using the four predefined button-control types, an application can create button controls that appear as defined by the owner window. When they must be drawn or highlighted, these button controls send WM_CONTROL messages with BN_PAINT as the notification code to their owner windows. ΓòÉΓòÉΓòÉ 8.1.2. Button Styles ΓòÉΓòÉΓòÉ The following table describes the button styles an application can use when creating button controls: Button Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle ΓöéDescription. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_3STATE ΓöéCreates a three-state check Γöé Γöé Γöébox (see also BS_CHECKBOX). Γöé Γöé ΓöéWhen the user selects the Γöé Γöé Γöécheck box, it sends a Γöé Γöé ΓöéWM_CONTROL message to the Γöé Γöé Γöéowner window. The owner shouldΓöé Γöé Γöéset the check box to the Γöé Γöé Γöéappropriate state: selected, Γöé Γöé Γöéunselected, or halftone. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_AUTO3STATE ΓöéCreates an auto-three-state Γöé Γöé Γöécheck box (see also Γöé Γöé ΓöéBS_CHECKBOX). When the user Γöé Γöé Γöéselects the check box, the Γöé Γöé Γöésystem automatically sets the Γöé Γöé Γöécheck box to the appropriate Γöé Γöé Γöéstate: selected, unselected, Γöé Γöé Γöéor halftone. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_AUTOCHECKBOX ΓöéCreates an auto-check box (seeΓöé Γöé Γöéalso BS_CHECKBOX). The system Γöé Γöé Γöéautomatically toggles the Γöé Γöé Γöécheck box between the selectedΓöé Γöé Γöéand unselected states each Γöé Γöé Γöétime the user selects the box.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_AUTORADIOBUTTON ΓöéCreates an auto-radio button Γöé Γöé Γöé(see also BS_RADIOBUTTON). Γöé Γöé ΓöéWhen the user selects an Γöé Γöé Γöéauto-radio button, the system Γöé Γöé Γöéautomatically selects the Γöé Γöé Γöébutton and removes the Γöé Γöé Γöéselection from the other Γöé Γöé Γöéauto-radio buttons in the Γöé Γöé Γöégroup. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_CHECKBOX ΓöéCreates a check box-a small Γöé Γöé Γöésquare that has text displayedΓöé Γöé Γöéto its right. When the user Γöé Γöé Γöéselects a check box, the checkΓöé Γöé Γöébox sends a WM_CONTROL messageΓöé Γöé Γöéto the owner window. The ownerΓöé Γöé Γöéwindow should toggle the checkΓöé Γöé Γöébox between selected and Γöé Γöé Γöéunselected states. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_DEFAULT ΓöéCreates a push button that hasΓöé Γöé Γöéa heavy black border. The userΓöé Γöé Γöécan select this push button byΓöé Γöé Γöépressing the spacebar. This Γöé Γöé Γöéstyle is useful for letting Γöé Γöé Γöéthe user quickly select the Γöé Γöé Γöémost likely set of options in Γöé Γöé Γöéa dialog window. This style isΓöé Γöé Γöévalid only in combination withΓöé Γöé Γöéthe BS_PUSHBUTTON style or theΓöé Γöé ΓöéPUSHBUTTON statement in a Γöé Γöé Γöéresource-definition file. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_HELP ΓöéCreates a push button that Γöé Γöé Γöéposts a WM_HELP message Γöé Γöé Γöé(instead of a WM_COMMAND Γöé Γöé Γöémessage) to its owner window Γöé Γöé Γöéwhen the user selects the Γöé Γöé Γöébutton. This style is valid Γöé Γöé Γöéonly in combination with the Γöé Γöé ΓöéBS_PUSHBUTTON style or the Γöé Γöé ΓöéPUSHBUTTON statement in a Γöé Γöé Γöéresource-definition file. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_NOCURSORSELECT ΓöéCreates an auto-radio button Γöé Γöé Γöéthat will not be selected Γöé Γöé Γöéautomatically when the user Γöé Γöé Γöémoves the cursor to the buttonΓöé Γöé Γöéusing the cursor-movement Γöé Γöé Γöékeys. This style is valid onlyΓöé Γöé Γöéin combination with the Γöé Γöé ΓöéBS_AUTORADIOBUTTON style or Γöé Γöé Γöéthe AUTORADIOBUTTON statement Γöé Γöé Γöéin a resource-definition file.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_NOBORDER ΓöéCreates a push button that hasΓöé Γöé Γöéno border. This style is validΓöé Γöé Γöéonly in combination with the Γöé Γöé ΓöéBS_PUSHBUTTON style or the Γöé Γöé ΓöéPUSHBUTTON statement in a Γöé Γöé Γöéresource-definition file. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_NOPOINTERFOCUS ΓöéCreates a radio button or Γöé Γöé Γöécheck box that does not Γöé Γöé Γöéreceive the keyboard focus Γöé Γöé Γöéwhen the user selects it. ThisΓöé Γöé Γöéstyle is valid in combination Γöé Γöé Γöéwith the BS_AUTORADIOBUTTON, Γöé Γöé ΓöéBS_RADIOBUTTON, BS_3STATE, Γöé Γöé ΓöéBS_AUTO3STATE, Γöé Γöé ΓöéBS_AUTOCHECKBOX, and Γöé Γöé ΓöéBS_CHECKBOX styles, or the Γöé Γöé ΓöéAUTORADIOBUTTON, RADIOBUTTON, Γöé Γöé ΓöéAUTOCHECKBOX, or CHECKBOX Γöé Γöé Γöéstatements in a Γöé Γöé Γöéresource-definition file. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_PUSHBUTTON ΓöéCreates a push button-a Γöé Γöé Γöéround-cornered rectangle with Γöé Γöé Γöétext displayed inside it. WhenΓöé Γöé Γöéselected, the push button Γöé Γöé Γöéposts a WM_COMMAND message to Γöé Γöé Γöéits owner window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_RADIOBUTTON ΓöéCreates a radio button-a smallΓöé Γöé Γöécircle that has text displayedΓöé Γöé Γöéto its right. Radio buttons Γöé Γöé Γöéusually are used in groups of Γöé Γöé Γöérelated, but exclusive, Γöé Γöé Γöéchoices. When the user selectsΓöé Γöé Γöéa radio button, the button Γöé Γöé Γöésends a WM_CONTROL message to Γöé Γöé Γöéits owner window. The user Γöé Γöé Γöéshould select the button and Γöé Γöé Γöéremove the selection from the Γöé Γöé Γöéother radio buttons in the Γöé Γöé Γöégroup. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_SYSCOMMAND ΓöéCreates a button that posts a Γöé Γöé ΓöéWM_SYSCOMMAND message (insteadΓöé Γöé Γöéof a WM_COMMAND message) to Γöé Γöé Γöéthe owner window when the userΓöé Γöé Γöéselects the button. This styleΓöé Γöé Γöéis valid only in combination Γöé Γöé Γöéwith the BS_PUSHBUTTON style Γöé Γöé Γöéor the PUSHBUTTON statement inΓöé Γöé Γöéa resource-definition file. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBS_USERBUTTON ΓöéCreates a user-defined button Γöé Γöé Γöéthat sends a WM_CONTROL Γöé Γöé Γöémessage to the owner window Γöé Γöé Γöéwhen the button needs to be Γöé Γöé Γöédrawn, highlighted, or Γöé Γöé Γöédisabled. A user-defined Γöé Γöé Γöébutton also posts WM_COMMAND Γöé Γöé Γöémessages to the owner window Γöé Γöé Γöéwhen the user selects the Γöé Γöé Γöébutton. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 8.1.3. Default Button Behavior ΓòÉΓòÉΓòÉ Following are the messages processed by the predefined button-control window class (WC_BUTTON). Each message is described in terms of how a button control responds to that message. Messages Processed by the WC_BUTTON Class ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_CLICK ΓöéSends a WM_BUTTON1DOWN and Γöé Γöé ΓöéWM_BUTTON1UP message to itselfΓöé Γöé Γöéto simulate a user button Γöé Γöé Γöéselection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_QUERYCHECK ΓöéReturns the checked state of Γöé Γöé Γöéthe button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_QUERYCHECKINDEX ΓöéReturns the 0-based index to Γöé Γöé Γöéthe selected button in a Γöé Γöé Γöégroup. Returns -1 if no buttonΓöé Γöé Γöéin the group is selected or ifΓöé Γöé Γöéthe button receiving the Γöé Γöé Γöémessage is not a radio button Γöé Γöé Γöéor an auto-radio button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_QUERYHILITE ΓöéReturns the highlighted state Γöé Γöé Γöéof the button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_SETCHECK ΓöéSets the checked state of the Γöé Γöé Γöébutton and returns the Γöé Γöé Γöéprevious checked state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_SETDEFAULT ΓöéSets the default button state Γöé Γöé Γöéand redraws the button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_SETHILITE ΓöéSets the highlighted state of Γöé Γöé Γöéthe button and returns the Γöé Γöé Γöéprevious highlighted state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéMarks button 1, sending a Γöé Γöé ΓöéBN_DBLCLICKED notification Γöé Γöé Γöécode when the button-up Γöé Γöé Γöémessage arrives. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéSets the button 1 window so itΓöé Γöé Γöécan capture mouse input. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1UP ΓöéIf the button 1 window can Γöé Γöé Γöécapture mouse input, and if Γöé Γöé Γöéthe mouse pointer is inside Γöé Γöé Γöébutton 1 when the button is Γöé Γöé Γöéreleased, this message Γöé Γöé Γöéreleases the mouse and sends aΓöé Γöé Γöénotification message to the Γöé Γöé Γöéowner window. If the button isΓöé Γöé Γöéa push button, the push buttonΓöé Γöé Γöécontrol posts a WM_COMMAND Γöé Γöé Γöémessage; otherwise, the buttonΓöé Γöé Γöécontrol sends a WM_CONTROL Γöé Γöé Γöémessage with the BN_CLICKED Γöé Γöé Γöénotification code. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéSets the button window so it Γöé Γöé Γöécan capture mouse input when Γöé Γöé Γöéthe spacebar is pressed; Γöé Γöé Γöéreleases the mouse when the Γöé Γöé Γöéspacebar is released. Passes Γöé Γöé Γöéother key messages to the Γöé Γöé Γöédefault window procedure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéValidates the requested buttonΓöé Γöé Γöéstyle and sets the window Γöé Γöé Γöétext. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéFrees the memory containing Γöé Γöé Γöéthe window's text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéSent when an application Γöé Γöé Γöéchanges the enabled state of aΓöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MATCHMNEMONIC ΓöéReturns TRUE if mp1 matches a Γöé Γöé Γöémnemonic in the control Γöé Γöé Γöéwindow's text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéSets the default mouse Γöé Γöé Γöépointer. If the button has theΓöé Γöé Γöémouse captured, the button's Γöé Γöé Γöéhighlighted state changes as Γöé Γöé Γöéthe mouse pointer moves in andΓöé Γöé Γöéout of the button boundary. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéDraws the button according to Γöé Γöé Γöéits style and current state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYDLGCODE ΓöéReturns the DLGC_BUTTON code Γöé Γöé Γöécombined with other DLGC_ Γöé Γöé Γöécodes that designate the Γöé Γöé Γöébutton's type. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéReturns the requested window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETFOCUS ΓöéCreates a cursor if the Γöé Γöé Γöébutton-control window is Γöé Γöé Γöéreceiving the focus. Destroys Γöé Γöé Γöéthe cursor if the Γöé Γöé Γöébutton-control window is Γöé Γöé Γöélosing the focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéSets the requested window Γöé Γöé Γöéparameters and redraws the Γöé Γöé Γöébutton, including the cursor, Γöé Γöé Γöéif the button-control window Γöé Γöé Γöéhas the focus. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 8.1.4. Button Notification Messages ΓòÉΓòÉΓòÉ A button that was created using the BS_PUSHBUTTON or BS_USERBUTTON style posts a WM_COMMAND message to its owner when the user selects it. An application can change this behavior by combining the BS_HELP or BS_SYSCOMMAND styles with the BS_PUSHBUTTON or BS_USERBUTTON styles when creating the button. A button control that has a style other than BS_PUSHBUTTON or BS_USERBUTTON sends WM_CONTROL messages to its owner when the user selects it. When the user selects a push button using the mouse pointer, the system automatically highlights the button. The button's window procedure tracks the movement of the pointer until the user releases the button. If the user moves the pointer so that it is outside the button boundary, the system turns off the highlight. The push button control does not post a WM_COMMAND message until the user releases the pointer button, and then, only if the button is released inside the push button boundary. When the owner window receives a WM_COMMAND message from a push button, the low word of the first parameter in the message contains the identifier of the button as specified either in the dialog template or in the WinCreateWindow function when the button was created. An application should avoid duplicating identifiers for menu items and button controls, because both the items and the controls post identifiers to owner windows as WM_COMMAND messages. However, the application can determine whether a WM_COMMAND message came from a menu or a push button control by looking for the value CMDSRC_MENU or CMDSRC_PUSHBUTTON in the low word of the message's second parameter. When the user selects any button other than a push button, that button sends a WM_CONTROL message. The application can examine SHORT1FROMMP(mp1) in the WM_CONTROL message to find the button identifier, and can examine SHORT2FROMMP(mp2) to determine the notification code for the control message. The notification code can be one of the following: Notification Code for Button Control Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBN_CLICKED ΓöéThe user selected the button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBN_DBLCLICKED ΓöéThe user double-clicked the button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBN_PAINT ΓöéA user-defined button needs to be drawn. Γöé Γöé ΓöéButtons with the BS_USERBUTTON style send Γöé Γöé Γöéthis notification code to instruct the owner Γöé Γöé Γöéwindow to draw the button control. The Γöé Γöé Γöésecond message parameter of the WM_CONTROL Γöé Γöé Γöémessage contains a pointer to a USERBUTTON Γöé Γöé Γöéstructure that contains the information Γöé Γöé Γöénecessary for drawing the button. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ When the user selects a check box or radio button, the button control sends the WM_CONTROL message with the BN_CLICKED notification code to the owner window. In response, the owner window should set the display state of the button by sending the appropriate message back to the button. An application need not respond to WM_CONTROL messages sent by an auto-check box or an auto-radio button; the system automatically sets the states of these buttons. ΓòÉΓòÉΓòÉ 8.1.5. Button States ΓòÉΓòÉΓòÉ An application can query and set the highlighted and checked states of its buttons by sending messages to them. An application can obtain the handle of a button by calling WinWindowFromID, using the parent window handle and the identifier of the button. In the case of a dialog window, the parent window would be the dialog window, and the identifier would be the button identifier from the dialog template. Button-control text is stored as window text. An application can set and retrieve this text by using the WinSetWindowText and WinQueryWindowText functions. To set the size, position, and visibility of a button control, an application uses the standard window functions. ΓòÉΓòÉΓòÉ 8.1.6. Custom Buttons ΓòÉΓòÉΓòÉ An application can customize the appearance of a button by using the BS_USERBUTTON style in combination with other button styles. The owner window receives WM_CONTROL messages for these custom buttons whenever they must be drawn, highlighted, or disabled. When a button must be drawn, the owner window receives a WM_CONTROL message with the high word of the first parameter equal to BN_PAINT. The second parameter is a pointer to a USERBUTTON structure that contains information the application needs to draw the button. An application uses the hwnd member of the USERBUTTON structure in a call to the WinQueryWindowRect function to find the bounding rectangle for the button. The hps member is used as a presentation space for any drawing. The fsState member contains flags that tell an application how to draw the button: highlighted, unhighlighted, or disabled. The fsStateOld member contains flags that describe the current highlighted, unhighlighted, or disabled state of the button. ΓòÉΓòÉΓòÉ 8.2. Using Button Controls ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Create a dialog template for a button resource. o Create a button for a client window. An application creates a group by setting the WS_GROUP style bit for the first member of the group. ΓòÉΓòÉΓòÉ 8.2.1. Using Buttons in a Dialog Window ΓòÉΓòÉΓòÉ You can define dialog-window buttons as part of a dialog template in a resource-definition file, as shown in the following Resource Compiler source-code fragment: DefiningDialog - WindowButtonsinaDialogTemplate DLGTEMPLATE IDD_BUTTON BEGIN DIALOG "", 2, 10, 10, 235, 180, WS_VISIBLE, FCF_DLGBORDER BEGIN AUTORADIOBUTTON "Radio~1", ID_RADIO1, 15, 80, 45, 12, WS_GROUP AUTORADIOBUTTON "Radio~2", ID_RADIO2, 15, 60, 45, 12 AUTORADIOBUTTON "Radio~3", ID_RADIO3, 15, 40, 45, 12 AUTORADIOBUTTON "Radio~4", ID_RADIO4, 15, 20, 45, 12 PUSHBUTTON "Button 1", ID_PUSH1, 20 100, 50, 14, WS_GROUP PUSHBUTTON "Button 2", ID_PUSH2, 75, 100, 50, 14, WS_GROUP PUSHBUTTON "Button 3", ID_PUSH3, 130, 100, 50, 14, WS_GROUP CHECKBOX "Check Box 1", ID_CHECK1, 150, 65, 65, 12, WS_GROUP CHECKBOX "no toggle", ID_CHECK2, 150, 40, 58, 12, WS_GROUP AUTOCHECKBOX "Check Box 3", ID_CHECK3, 150, 20, 65, 12, WS_GROUP DEFPUSHBUTTON "OK", DID_OK, 75, 26, 46, 20, WS_GROUP END END Each button in a dialog window has an identifier (for example, ID_RADIO1) that allows an application to identify the source of the WM_COMMAND and WM_CONTROL messages. An application can use the identifier as the second argument of the WinWindowFromID function to retrieve the button-window handle. The dialog template also contains the text for each button. For push buttons, this text is displayed in a rectangular box. If the text is too long to fit in the box, the text is clipped. For radio buttons and check boxes, text is displayed to the right of the button. A user selects the button by clicking either the button or the text itself. The WS_GROUP style identifies the beginning of each new group of buttons. In the preceding example, the four auto-radio buttons are in the same group, and each of the other buttons is in its own group. The auto-radio buttons in the first group can be selected one at a time only. An application must ensure that only one check box in a group is selected at a time. The order in which items can be selected in the group can wrap around from the end of the item list to its beginning. Notice that the DEFPUSHBUTTON style in the preceding example has the identifier DID_OK. It is customary to include an OK button with this identifier in most dialog windows to provide a uniform user interface. The DEFPUSHBUTTON style draws a thick border around a button and allows a user to select the button by pressing the spacebar. The dialog-window procedure for a dialog window that contains buttons must respond to WM_COMMAND and WM_CONTROL messages. A common strategy is to use auto-radio buttons and auto-check boxes to let the user set a list of capabilities for a command, and, then, let the user execute the command by choosing an OK push button. With this strategy, the dialog-window procedure ignores all WM_CONTROL messages that come from auto-radio buttons and auto-check boxes. When the dialog-window procedure receives a WM_COMMAND message for the OK push button, the procedure should query the auto-radio buttons and auto-check boxes to determine which options have been selected. ΓòÉΓòÉΓòÉ 8.2.2. Using Buttons in a Client Window ΓòÉΓòÉΓòÉ An application can create a button control using an application client window as the owner. The following code fragment shows how an application can use buttons in client windows: CreatingaButtonControlforaClientWindow #define ID_PBWINDOW 110 HWND hwndButton,hwndClient; /* Create a button window. */ hwndButton = WinCreateWindow(hwndClient, /* Parent window */ WC_BUTTON, /* Class window */ "Test Button" /* Button text */ WS_VISIBLE | /* Visible style */ BS_PUSHBUTTON, /* Button style */ 10, 10, /* x, y */ 70, 60, /* cx, cy */ hwndClient, /* Owner window */ HWND_TOP, /* Top of z-order */ ID_PBWINDOW, /* Identifier */ NULL, /* Control data */ NULL); /* parameters */ Once created in the client window, the button control posts a WM_COMMAND message or sends a WM_CONTROL message to the client-window procedure. This window procedure should examine the message identifier to determine which button posted or sent the message. An application that has client-window buttons can move and size the buttons when the client window receives a WM_SIZE message. An application can move and size a window by using the WinSetWindowPos function. An application can obtain a window handle for a button control by calling the WinWindowFromID function, specifying the handle of the parent window and the window identifier for each button. ΓòÉΓòÉΓòÉ 8.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions, structures, and messages used with button controls: Button-Control Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateWindow ΓöéCreates a new window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowText ΓöéCopies window text into a buffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowText ΓöéSets the window text for the Γöé Γöé Γöéspecified window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWindowFromID ΓöéReturns the handle of the child Γöé Γöé Γöéwindow with the specified identify. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Button-Control Structure ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéUSERBUTTON ΓöéUser-button structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Received by a Button Control ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_CLICK ΓöéApplication sends this message to Γöé Γöé Γöécause the effect of the user Γöé Γöé Γöéclicking a push button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_QUERYCHECK ΓöéReturns the zero-based index of a Γöé Γöé Γöéchecked radio button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_QUERYCHECKINDEX ΓöéReturns the zero-based index of a Γöé Γöé Γöéchecked radio button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_QUERYHILITE ΓöéReturns the highlighting state of a Γöé Γöé Γöébutton control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_SETCHECK ΓöéSets the checked state of a button Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_SETDEFAULT ΓöéSets the default state of a button Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBM_SETHILITE ΓöéSets the highlight state of a buttonΓöé Γöé Γöécontrol. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Generated by a Button Control ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_COMMAND ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner, or when a keystroke has been Γöé Γöé Γöétranslated by an accelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to a control's owner window Γöé Γöé Γöéwhen the pointer moves over the Γöé Γöé Γöécontrol window, allowing the owner Γöé Γöé Γöéto set the pointer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéSets the enable state of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HELP ΓöéOccurs when a control procedure doesΓöé Γöé Γöénot expect to receive this message Γöé Γöé Γöéand, therefore, takes no action on Γöé Γöé Γöéit, other than to set count to the Γöé Γöé Γöédefault value of NULL. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MATCHMNEMONIC ΓöéSent by the dialog box to a control Γöé Γöé Γöéwindow to determine whether a typed Γöé Γöé Γöécharacter matches a mnemonic in its Γöé Γöé Γöéwindow text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé Γöéconversion of DBCS characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe button control window procedure Γöé Γöé Γöéwindow parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the button control window Γöé Γöé Γöéprocedure window parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SYSCOMMAND ΓöéOccurs when a control window has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner, or when a keystroke has been Γöé Γöé Γöétranslated by an accelerator table Γöé Γöé Γöéinto a WM_SYSCOMMAND. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 9. List-Box Controls ΓòÉΓòÉΓòÉ A list box is a control window that displays several text items at a time, one or more of which can be selected by the user. This chapter explains how to create and use list-box controls in PM applications. ΓòÉΓòÉΓòÉ 9.1. About List Boxes ΓòÉΓòÉΓòÉ An application uses a list box when it requires a list of selectable fields that is too large for the display area or a list of choices that can change dynamically. Each list item contains a text string and a handle. Usually, the text string is displayed in the list-box window; but the handle is available to the application to reference other data associated with each of the items in the list. A list box always is owned by another window that receives messages from the list box when events occur, such as when a user selects an item from the list box. Typically, the owner is a dialog window (as shown in the following figure,) or the client window of an application frame window. The client- or dialog-window procedure defined by the application responds to messages sent from the list box. List Box in a Dialog Box A list box always contains a scroll bar for use when the list box contains more items than can be displayed in the list-box window. The list box responds to mouse clicks in the scroll bar by scrolling the list; otherwise, the scroll bar is disabled. The maximum number of items permitted in a list box is 32767. ΓòÉΓòÉΓòÉ 9.2. Using List Boxes ΓòÉΓòÉΓòÉ An application uses a list-box control to display a list in a window. List boxes can be displayed in standard application windows, although they are more commonly used in dialog windows. In either case, notification messages are sent from the list box to its owner window, enabling the application to respond to user actions in the list. Once a list box is created, the application controls the insertion and deletion of list items. Items can be inserted at the end of the list, automatically sorted into the list, or inserted at a specified index position. Applications can turn list drawing on and off to speed up the process of inserting numerous items into a list. The owner-window procedure of the list box receives messages when a user manipulates the list-box data. Most default list actions (for example, highlighting selections and scrolling) are handled automatically by the list box itself. The application controls the responses when the user chooses an item in the list, either by double-clicking the item or by pressing Enter after an item is highlighted. The list box also notifies the application when the user changes the selection or scrolls the list. Normally, list items are text strings drawn by a list box. An application also can draw and highlight the items in a list. This enables the application to create customized lists that contain graphics. When an application creates a list box with the LS_OWNERDRAW style, the owner of the list box receives a WM_DRAWITEM message for each item that should be drawn or highlighted. This is similar to the owner-drawn style for menus, except that the owner-drawn style applies to the entire list rather than to individual items. ΓòÉΓòÉΓòÉ 9.2.1. Creating a List-Box Window ΓòÉΓòÉΓòÉ List boxes are WC_LISTBOX class windows and are predefined by the system. Applications can create list boxes by calling WinCreateWindow, using WC_LISTBOX as the window-class parameter. A list box passes notification messages to its owner window, so an application uses its client window, rather than the frame window, as the owner of the list. The client-window procedure receives the messages sent from the list box. For example, to create a list box that completely fills the client area of a frame window, an application would make the client window the owner and parent of the list-box window, and make the list-box window the same size as the client window. This is shown in the following code fragment. #define ID_LISTWINDOW 250 HWND hwndClient,hwndList; RECTL rcl; /* How big is the client window? */ WinQueryWindowRect(hwndClient, &rcl); /* Make a list-box window. */ hwndList = WinCreateWindow(hwndClient, /* Parent */ WC_LISTBOX, /* Class */ "", /* Name */ WS_VISIBLE | LS_NOADJUSTPOS, /* Style */ 0, 0, /* x, y */ rcl.xRight, rcl.yTop, /* cx, cy */ hwndClient, /* Owner */ HWND_TOP, /* Behind */ ID_LISTWINDOW, /* ID */ NULL, /* Control data */ NULL); /* parameters */ Because the list box draws its own border, and a frame-window border already surrounds the client area of a frame window due to the adjacent frame controls, the effect is a double-thick border around the list box. You can change this effect by calling WinInflateRect to overlap the list-box border with the surrounding frame-window border, resulting in only one list-box border. Notice that the code specifies the list-box window style LS_NOADJUSTPOS. This ensures that the list box is created exactly the specified size. If the LS_NOADJUSTPOS style is not specified, the list-box height is rounded down, if necessary, to make it a multiple of the item height. Enabling a list box to adjust its height automatically is useful for preventing partial items being displayed at the bottom of a list box. ΓòÉΓòÉΓòÉ 9.2.2. Using a List Box in a Dialog Window ΓòÉΓòÉΓòÉ List boxes most commonly are used in dialog windows. A list box in a dialog box is a control window, like a push button or an entry field. Typically, the application defines a list box as one item in a dialog template in the resource-definition file, as shown in the following resource compiler source-code fragment. DLGTEMPLATE IDD_OPEN BEGIN DIALOG "Open...", IDD_OPEN, 35, 35, 150, 135, FS_DLGBORDER, FCF_TITLEBAR BEGIN LISTBOX IDD_FILELIST, 15, 15, 90, 90 PUSHBUTTON "Drive", IDD_DRIVEBUTTON, 115, 70, 30, 14 DEFPUSHBUTTON "Open", IDD_OPENBUTTON, 115, 40, 30, 14 PUSHBUTTON "Cancel", IDD_CANCELBUTTON, 115, 15, 30, 14 END END Once the dialog resource is defined, the application loads and displays the dialog box as it would normally. The application inserts items into the list when processing the WM_INITDLG message. A dialog window with a list box usually has an OK button. The user can select items in the list, and then indicate a final selection by double-clicking, pressing Enter, or clicking the OK button. When the dialog-window procedure receives a message indicating that the user has clicked the OK button, it queries the list box to determine the current selection (or selections, if the list allows multiple selections), and then responds as though it had received a WM_CONTROL message with the LN_ENTER notification code. ΓòÉΓòÉΓòÉ 9.2.3. Adding or Deleting an Item in a List Box ΓòÉΓòÉΓòÉ Applications can add or delete an item in a list box by sending an LM_INSERTITEM or LM_DELETEITEM message to the list-box window. Items in a list are specified with a 0-based index (beginning at the top of the list). A new list is created empty; then, the application initializes the list by inserting items. The application specifies the text and position for each new item. It can specify an absolute-position index or one of the following predefined index values: List Item Position Index ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéValue ΓöéMeaning Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLIT_END ΓöéInsert item at end of list. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLIT_SORTASCENDING ΓöéInsert item alphabetically ascendingΓöé Γöé Γöéinto list. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLIT_SORTDESCENDING ΓöéInsert item alphabetically Γöé Γöé Γöédescending into list. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ The application must send an LM_DELETEITEM message and supply the absolute-position index of the item when deleting items from a list. The LM_DELETEALL message deletes all items in a list. One way an application can speed up the insertion of list items is to suspend drawing until it has finished inserting items. This is a particularly valuable approach when using a sorted insertion process (when inserting one item can cause rearrangement of the entire list). You can turn off list drawing by calling WinEnableWindowUpdate, specifying FALSE for the enable parameter, and then calling WinShowWindow. This forces a total update when insertion is complete. The following code fragment illustrates this concept: HWND hwndFileList; /* Disable updates while filling the list. */ WinEnableWindowUpdate(hwndFileList, FALSE); . . /* Send LM_INSERTITEM messages to insert all new items. */ . /* Now cause the window to update and show the new information. */ WinShowWindow(hwndFileList, TRUE); Notice that this optimization is unnecessary if an application is adding list items while processing a WM_INITDLG message, because the list box is not visible, and the list-box routines are internally optimized. ΓòÉΓòÉΓòÉ 9.2.4. Responding to a User Selection in a List Box ΓòÉΓòÉΓòÉ When a user chooses an item in a list, the primary notification an application receives is a WM_CONTROL message, with the LN_ENTER control code sent to the owner window of the list. Within the window procedure for the owner window, the application responds to the LN_ENTER control code by querying the list box for the current selection (or selections, in the case of an LS_MULTIPLESEL or LS_EXTENDEDSEL list box). The LN_ENTER control code notifies the application that the user has selected a list item. A WM_CONTROL message with an LN_SELECT control code is sent to the list-box owner whenever a selection in a list changes, such as when a user moves the mouse pointer up and down a list while pressing the mouse button. In this case, items are selected but not yet chosen. An application can ignore LN_SELECT control codes when the selection changes, responding only when the item is actually chosen. Or an application can use LN_SELECT to display context-dependent information that changes rapidly with each selection made by the user. ΓòÉΓòÉΓòÉ 9.2.5. Handling Multiple Selections ΓòÉΓòÉΓòÉ When a list box has the style LS_MULTIPLESEL or LS_EXTENDEDSEL, the user can select more than one item at a time. An application must use different strategies when working with these types of lists. For example, when responding to an LN_ENTER control code, it is not sufficient to send a single LM_QUERYSELECTION message, because that message will find only the first selection. To find all current selections, an application must continue sending LM_QUERYSELECTION messages, using the return index of the previous message as the starting index of the next message, until no items are returned. ΓòÉΓòÉΓòÉ 9.2.6. Creating an Owner-Drawn List Item ΓòÉΓòÉΓòÉ To draw its own list items, an application must create a list that has the style LS_OWNERDRAW: the owner window of the list box must respond to the WM_MEASUREITEM and WM_DRAWITEM messages. When the owner window receives a WM_MEASUREITEM message, it must return the height of the list item. All items in a list must have the same height (greater than or equal to 1). The WM_MEASUREITEM message is sent when the list box is created, and every time an item is added. You can change the item height by sending an LM_SETITEMHEIGHT message to the list-box window. The owner window receives a WM_DRAWITEM message whenever an item in an owner-drawn list should be drawn or highlighted. Although it is quite common for an owner-drawn list to draw items, it is less common to override the system-default method of highlighting. (This method inverts the rectangle that contains the item.) Do not create your own highlighting unless, for some reason, the system-default method is unacceptable to you. The WM_DRAWITEM message contains a pointer to an OWNERITEM data structure. The OWNERITEM structure contains the window identifier for the list box, a presentation-space handle, a bounding rectangle for the item, the position index for the item, and the application-defined item handle. This structure also contains two fields that determine whether a message draws, highlights, or removes the highlighting from an item. The OWNERITEM structure has the following form: typedef struct _OWNERITEM { /* oi */ HWND hwnd; HPS hps; ULONG fsState; ULONG fsAttribute; ULONG fsStateOld; ULONG fsAttributeOld; RECTL rclItem; LONG idItem; ULONG hItem; } OWNERITEM; When the item must be drawn, the owner window receives a WM_DRAWITEM message with the fsState field set differently from the fsStateOld field. If the owner window draws the item in response to this message, it returns TRUE, telling the system not to draw the item. If the owner window returns FALSE, the system draws the item, using the default list-item drawing method. You can get the text of a list item by sending an LM_QUERYITEMTEXT message to the list-box window. You should draw the item using the hps and rclItem arguments provided in the OWNERITEM structure. If the item being drawn is currently selected, the fsState and fsStateOld fields are both TRUE; they both will be FALSE if the item is not currently selected. The window receiving a WM_DRAWITEM message can use this information to highlight the selected item at the same time it draws the item. If the owner window highlights the item, it must leave the fsState and fsStateOld fields equal to each other. If the system provides default highlighting for the item (by inverting the item rectangle), the owner window must set the fsState field to 1 and the fsStateOld field to 0 before returning from the WM_DRAWITEM message. The owner window also receives a WM_DRAWITEM message when the highlight state of a list item changes. For example, when a user clicks an item, the highlighting must be removed from the currently selected item, and the new selection must be highlighted. If these items are owner-drawn, the owner window receives one WM_DRAWITEM message for each unhighlighted item and one message for the newly highlighted item. To highlight an item, the fsState field must equal TRUE, and the fsStateOld field must equal FALSE. In this case, the application should highlight the item and return the fsState and fsStateOld fields equal to FALSE, which tells the system not to highlight the item. The application also can return the fsState and fsStateOld fields with two different (unequal) values and the list box will highlight the item (the default action). To remove highlighting from an item, the fsState field must equal FALSE and the fsStateOld field must equal TRUE. In this case, the application removes the highlighting and returns both the fsState and the fsStateOld fields equal to FALSE. This tells the system not to attempt to remove the highlighting. The application also can return the fsState and fsStateOld fields with two different (unequal) values, and the list box will remove the highlighting (the default response). The following code fragment shows these selection processes: OWNERITEM *poi; case WM_DRAWITEM: /* Convert mp2 into an OWNERITEM structure pointer. */ poi = (POWNERITEM) PVOIDFROMMP(mp2); /* Test to see if this is drawing or highlighting/unhighlighting. */ if (poi->fsState != poi->fsStateOld) { /* This is either highlighting or unhighlighting. */ if (poi->fsState) { . . /* Highlight the item. */ . } else { . . /* Remove the highlighting. */ . } /* Set fsState = fsStateOld to tell system you did it. */ poi->fsState = poi->fsStateOld = 0; return TRUE; /* Tells list box you did the highlighting. */ } else { . . /* Draw the item. */ . if (poi->fsState) { /* Checks to see if item is selected */ . . /* Highlight the item. */ . /* Set fsState = fsStateOld to tell system you did it. */ } return TRUE; /* Tells list box you did the drawing. */ } ΓòÉΓòÉΓòÉ 9.2.7. Default List-Box Behavior ΓòÉΓòÉΓòÉ This following table lists all the messages handled by the predefined list-box window-class procedure. Messages Handled by WC_LISTBOX Class ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_DELETEALL ΓöéDeletes all items in the list. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_DELETEITEM ΓöéRemoves the specified item from the Γöé Γöé Γöélist, redrawing the list as Γöé Γöé Γöénecessary. Returns the number of Γöé Γöé Γöéitems remaining in the list. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_INSERTITEM ΓöéInserts a new item in the list Γöé Γöé Γöéaccording to the position Γöé Γöé Γöéinformation passed with the message.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMCOUNT ΓöéReturns the number of items in the Γöé Γöé Γöélist. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMHANDLE ΓöéReturns the specified item handle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMTEXT ΓöéCopies the text of the specified Γöé Γöé Γöéitem to a buffer supplied by the Γöé Γöé Γöémessage sender. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMTEXTLENGTH ΓöéReturns the text length of the Γöé Γöé Γöéspecified item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYSELECTION ΓöéFor a single-selection list box, Γöé Γöé Γöéreturns the zero-based index of the Γöé Γöé Γöécurrently selected item. For a Γöé Γöé Γöémultiple-selection list box, returnsΓöé Γöé Γöéthe next selected item or LIT_NONE Γöé Γöé Γöéif no more items are selected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYTOPINDEX ΓöéReturns the zero-based index to the Γöé Γöé Γöéitem currently visible at the top ofΓöé Γöé Γöéthe list. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SEARCHSTRING ΓöéSearches the list for a match to theΓöé Γöé Γöéspecified string. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SELECTITEM ΓöéSelects the specified item. If the Γöé Γöé Γöélist is a single-selection list, Γöé Γöé Γöédeselects the previous selection. Γöé Γöé ΓöéSends a WM_CONTROL message (with theΓöé Γöé ΓöéLN_SELECT code) to the owner window.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETITEMHANDLE ΓöéSets the specified item handle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETITEMHEIGHT ΓöéSets the item height for the list. Γöé Γöé ΓöéAll items in the list have the same Γöé Γöé Γöéheight. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETITEMTEXT ΓöéSets the text for the specified Γöé Γöé Γöéitem. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETTOPINDEX ΓöéShows the specified item as the top Γöé Γöé Γöéitem in the list window, scrolling Γöé Γöé Γöéthe list as necessary. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ADJUSTWINDOWPOS ΓöéIf the list box has the style Γöé Γöé ΓöéLS_NOADJUSTPOS, makes no changes to Γöé Γöé Γöéthe SWP structure and returns FALSE.Γöé Γöé ΓöéOtherwise, adjusts the height of theΓöé Γöé Γöélist box so that a partial item is Γöé Γöé Γöénot shown at the bottom of the list.Γöé Γöé ΓöéReturns TRUE if the SWP structure isΓöé Γöé Γöéchanged. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DOWN ΓöéReturns TRUE; the message is Γöé Γöé Γöéignored. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DOWN ΓöéReturns TRUE; the message is Γöé Γöé Γöéignored. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéProcesses virtual keys for line and Γöé Γöé Γöépage scrolling. Sends an LN_ENTER Γöé Γöé Γöénotification code for the Enter key.Γöé Γöé ΓöéReturns TRUE if the key is Γöé Γöé Γöéprocessed; otherwise, passes the Γöé Γöé Γöémessage to the WinDefWindowProc Γöé Γöé Γöéfunction. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéCreates an empty list box with a Γöé Γöé Γöéscroll bar. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéDestroys the list and deallocates Γöé Γöé Γöéany memory allocated during its Γöé Γöé Γöéexistence. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéEnables the scroll bar if there are Γöé Γöé Γöémore items than can be displayed in Γöé Γöé Γöéa list-box window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéSets the mouse pointer to the arrow Γöé Γöé Γöéshape and returns TRUE to show that Γöé Γöé Γöéthe message was processed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéDraws the list box and its items. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETFOCUS ΓöéIf the list box is gaining the Γöé Γöé Γöéfocus, creates a cursor and sends anΓöé Γöé ΓöéLN_SETFOCUS notification code to theΓöé Γöé Γöéowner window. If the list box is Γöé Γöé Γöélosing the focus, this message Γöé Γöé Γöédestroys the cursor and sends an Γöé Γöé ΓöéLN_KILLFOCUS notification code to Γöé Γöé Γöéthe owner window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TIMER ΓöéUses timers to control automatic Γöé Γöé Γöéscrolling that occurs when a user Γöé Γöé Γöédrags the mouse pointer outside the Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SCROLL ΓöéHandles scrolling indicated by the Γöé Γöé Γöélist-box scroll bar. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 9.3. Summary ΓòÉΓòÉΓòÉ Following are the operating system structure, functions, and messages used with list boxes. List-Box Structure ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéOWNERITEM ΓöéOwner item. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ List-Box Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDeleteLboxItem ΓöéDeletes the indexed item from the Γöé Γöé Γöélist box. Returns the number of Γöé Γöé Γöéitems left. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinInsertLboxItem ΓöéInserts text into a list box at Γöé Γöé Γöéindex. Returns the actual index Γöé Γöé Γöéwhere it was inserted. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryLboxCount ΓöéReturns the number of items in the Γöé Γöé Γöélist box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryLboxItemText ΓöéFills the buffer with the text of Γöé Γöé Γöéthe indexed item. Returns the Γöé Γöé Γöélength of the text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryLboxItemTextLengΓöéReturns the length of the text of Γöé Γöé Γöéthe indexed item in the list box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryLboxSelectedItemΓöéReturns the index of the selected Γöé Γöé Γöéitem in the list box. For single Γöé Γöé Γöéselection only. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetLboxItemText ΓöéSets the text of the list box Γöé Γöé Γöéindexed item to buffer. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Generated by a List Box to Its Owner ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when a list box control has aΓöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DRAWITEM ΓöéNotification sent to the owner of a Γöé Γöé Γöélist box control each time an item Γöé Γöé Γöéis to be drawn. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MEASUREITEM ΓöéNotification sent to the owner of a Γöé Γöé Γöéspecific list box control to Γöé Γöé Γöéestablish the height and width of anΓöé Γöé Γöéitem in that control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé Γöéconversion of DBCS characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe list box control window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the list box control window Γöé Γöé Γöéparameters. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Received by a List Box ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_DELETEALL ΓöéSent to a list box control to deleteΓöé Γöé Γöéall the items in the list box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_DELETEITEM ΓöéDeletes an item from the list box Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_INSERTITEM ΓöéInserts an item into a list box Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMCOUNT ΓöéReturns a count of the number of Γöé Γöé Γöéitems in the list box control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMHANDLE ΓöéReturns the handle of the indexed Γöé Γöé Γöéitem of the list box control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMTEXT ΓöéReturns the text of the specified Γöé Γöé Γöélist box item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYITEMTEXTLENGTH ΓöéReturns the length of the text of Γöé Γöé Γöéthe specified list box item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYSELECTION ΓöéUsed to enumerate the selected item,Γöé Γöé Γöéor items, in a list box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_QUERYTOPINDEX ΓöéObtains the index of the item Γöé Γöé Γöécurrently at the top of the list Γöé Γöé Γöébox. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SEARCHSTRING ΓöéReturns the index of the list box Γöé Γöé Γöéitem whose text matches the string. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SELECTITEM ΓöéUsed to set the selection state of Γöé Γöé Γöéan item in a list box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETITEMHANDLE ΓöéSets the handle of the specified Γöé Γöé Γöélist box item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETITEMHEIGHT ΓöéSets the height of the items in a Γöé Γöé Γöélist box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETITEMTEXT ΓöéSets the text into the specified Γöé Γöé Γöélist box item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLM_SETTOPINDEX ΓöéUsed to scroll a particular item to Γöé Γöé Γöéthe top of the list box. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 10. Combination-Box Controls ΓòÉΓòÉΓòÉ A combination box is two controls in one: an entry field and a list box. This chapter describes how to use combination-box controls, also called combination boxes and prompted entry fields, to let the user choose and edit items from a list in a PM application. ΓòÉΓòÉΓòÉ 10.1. About Combination Boxes ΓòÉΓòÉΓòÉ Combination-box controls enable the user to enter data by typing in the entry field or by choosing from a list in the list box. The following figure is an example of a combination box. Combination Box A combination-box control automatically manages the interaction between the entry field and the list box. For example, when the user chooses an item in the list box, the combination-box control displays the text for that item in the entry field. Then, the user can edit the text without affecting the item in the list box. When the user types a letter in the entry field, the combination-box control scrolls the list box contents so that items beginning with that letter become visible. ΓòÉΓòÉΓòÉ 10.1.1. Combination-Box Styles ΓòÉΓòÉΓòÉ A combination box can have one of the following styles: Combination-Box Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBS_SIMPLE ΓöéCreates a simple combination box Γöé Γöé Γöéthat always displays its list box. Γöé Γöé ΓöéThe user can enter and edit text in Γöé Γöé Γöéthe entry field or choose items fromΓöé Γöé Γöéthe list box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBS_DROPDOWN ΓöéCreates a drop-down combination box Γöé Γöé Γöéthat displays its list box only if Γöé Γöé Γöéthe user clicks the drop-down icon Γöé Γöé Γöéat the right end of the entry field.Γöé Γöé ΓöéThe combination-box control hides Γöé Γöé Γöéthe list box when the user clicks Γöé Γöé Γöéthe icon a second time. In a Γöé Γöé Γöédrop-down combination box, the user Γöé Γöé Γöécan enter and edit text in the entryΓöé Γöé Γöéfield or choose items from the list Γöé Γöé Γöébox. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBS_DROPDOWNLIST ΓöéCreates a drop-down-list combinationΓöé Γöé Γöébox that is similar to the drop-downΓöé Γöé Γöécombination box, except that the Γöé Γöé Γöéuser can choose items only from the Γöé Γöé Γöélist box. The user cannot enter or Γöé Γöé Γöéedit text in the entry field. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ For combination boxes that have the CBS_DROPDOWN or CBS_DROPDOWNLIST styles, an application can display the list by using the CBM_SHOWLIST message. Drop-Down Combination Box This is an example of a drop-down list box. Drop-Down List Box An application can determine whether the list is already showing by using the CBM_ISLISTSHOWING message. Applications also can use any of the entry-field (EM_) and list-box (LM_) messages with combination boxes. Entry-field messages affect the entry field; list-box messages affect the list box. For example, an application can use the LM_INSERTITEM message to insert items into the list box. ΓòÉΓòÉΓòÉ 10.1.2. Notification Codes ΓòÉΓòÉΓòÉ A combination-box control sends WM_CONTROL messages containing notification codes to its parent window. These notification codes are similar to those sent by entry-field and list-box controls. A combination-box control sends the following notification codes to its owner window: Combination-Box Notification Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBN_EFCHANGE ΓöéIndicates that the text in a combination-box Γöé Γöé Γöéentry field has changed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBN_EFSCROLL ΓöéIndicates that the text in a combination-box Γöé Γöé Γöéentry field has been scrolled. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBN_ENTER ΓöéIndicates that a combination-box item has Γöé Γöé Γöébeen selected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBN_LBSCROLL ΓöéIndicates that a combination-box list has Γöé Γöé Γöébeen scrolled. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBN_LBSELECT ΓöéIndicates that a combination-box list item Γöé Γöé Γöéhas been selected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBN_MEMERROR ΓöéIndicates that the combination-box control Γöé Γöé Γöécannot allocate sufficient memory. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBN_SHOWLIST ΓöéIndicates that a combination-box list has Γöé Γöé Γöédropped down (is visible). Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 10.2. Using Combination Boxes ΓòÉΓòÉΓòÉ You can create a combination box by using the WinCreateWindow function or by specifying a COMBOBOX statement in a dialog-window template in a resource file. When creating a combination box using WinCreateWindow, you must specify the predefined class WC_COMBOBOX. If you do not specify a style, the function uses the default styles WS_GROUP, WS_TABSTOP, and WS_VISIBLE. ΓòÉΓòÉΓòÉ 10.3. Summary ΓòÉΓòÉΓòÉ The following table lists the OS/2 messages used with combination-box controls: Messages Received by a Combination Box ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBM_HILITE ΓöéSets the highlighting state of the Γöé Γöé Γöéentry field control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCMB_ISLISTSHOWING ΓöéDetermines whether the list box Γöé Γöé Γöécontrol is showing. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCBM_SHOWLIST ΓöéSets the showing state of the list Γöé Γöé Γöébox control. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Message Sent From a Combination Box to Its Owner ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 11. Menus ΓòÉΓòÉΓòÉ A menu is a window that contains a list of items- text strings, bit maps, or images drawn by the application-that enables the user, by mouse or keyboard, to choose from these predetermined choices. This chapter describes how to use menus in your PM applications. ΓòÉΓòÉΓòÉ 11.1. About Menus ΓòÉΓòÉΓòÉ A menu always is owned by another window, usually a frame window. When a user makes a choice from a menu, the menu posts a message containing the unique identifier for the menu item to its owner by way of the owner window's window procedure. Menus An application typically defines its menus using Resource Compiler, and then associates the menus with a frame window when the frame window is created. Applications also can create menus by filling in menu-template data structures and creating windows with the WC_MENU class. Either way, applications can add, delete, or change menu items dynamically by issuing messages to menu windows. ΓòÉΓòÉΓòÉ 11.1.1. Menu Bar and Pull-Down Menus ΓòÉΓòÉΓòÉ A typical application uses a menu bar and several pull-down submenus. The pull-down submenus ordinarily are hidden, but become visible when the user makes selections in the menu bar. Pull-down submenus always are attached to the menu bar. The menu bar is a child of the frame window; the menu bar window handle is the key to communicating with the menu bar and its submenus. You can retrieve this handle by calling WinWindowFromID, with the handle of the parent window and the FID_MENU frame-control identifier. Most messages for the menu bar and its submenus can be issued to the menu-bar window. Flags in the messages tell the window whether to search submenus for requested menu items. ΓòÉΓòÉΓòÉ 11.1.2. Pop-Up Menus ΓòÉΓòÉΓòÉ A pop-up menu is like a pull-down submenu, except that it is not attached to the menu bar; it can appear anywhere in its parent window. A pop-up menu usually is associated with a portion of a window, such as the client window (see the following figure), or it is associated with a specific object, such as an icon. Pop-Up Menu A pop-up menu remains hidden until the user selects it (either by moving the cursor to the appropriate location and pressing Enter or clicking on the location with the mouse). Typically, pop-up menus are displayed at the position of the cursor or mouse pointer; they provide a quick mechanism for selecting often-used menu items. To include a pop-up menu in an application, you first must define a menu resource in a resource-definition file, then load the resource using the WinLoadMenu or WinCreateMenu functions. You must call WinPopupMenu to create the pop-up menu and display it in the parent window. Applications typically call WinPopupMenu in a window procedure in response to a user-generated message, such as WM_BUTTON2DBLCLK or WM_CHAR. WinPopupMenu requires that you specify the pop-up menu's handle and also the handles of the parent and owner windows of the pop-up menu. WinLoadMenu and WinCreateMenu return the handle of the pop-up menu window, but you must obtain the handles of the parent and owner by using the WinWindowFromID function. You determine the position of the pop-up menu in relation to its parent by specifying coordinates and style flags in WinPopupMenu. The x and y coordinates determine the position of the lower-left corner of the menu relative to the lower-left corner of the parent. The system may adjust this position, however, if you include the PU_HCONSTRAIN or PU_VCONSTRAIN style flags in the call to WinPopupMenu. If necessary, PU_HCONSTRAIN adjusts the horizontal position of the menu so that its left and right edges are within the borders of the desktop window. PU_VCONSTRAIN makes the same adjustments vertically. Without these flags, a desktop-level pop-up menu can lie partially off the screen, with some items not visible nor selectable. The PU_POSITIONONITEM flag also can affect the position of the pop-up menu. This flag positions the pop-up menu so that, when the pop-up menu appears, the specified item lies directly under the mouse pointer. Also, PU_POSITIONONITEM automatically selects the item. PU_POSITIONONITEM is useful for placing the current menu selection under the pointer so that, if the user releases the mouse button without selecting a new item, the current selection remains unchanged. The PU_SELECTITEM flag is similar to PU_POSITIONONITEM except that it just selects the specified item; it does not affect the position of the menu. You can enable the user to choose an item from a pop-up menu by using the same mouse button that was used to display the menu. To do this, specify the PU_MOUSEBUTTONn flag, where n corresponds to the mouse button used to display the menu. This flag specifies the mouse buttons for the user to interact with a pop-up menu once it is displayed. By using the PU_MOUSEBUTTONn flag, you can enable the user to display the pop-up menu, select an item, and dismiss the menu, all in one operation. For example, if your window procedure displays the pop-up window when the user double-clicks mouse button 2, specify the PU_MOUSEBUTTON2DOWN flag in the WinPopupMenu function. Then, the user can display the menu with mouse button 2; and, while holding the button down, select an item. When the user releases the button, the item is chosen and the menu dismissed. ΓòÉΓòÉΓòÉ 11.1.3. System Menu ΓòÉΓòÉΓòÉ The system menu in the upper-left corner of a standard frame window is different from the menus defined by the application. The system menu is controlled and defined almost exclusively by the system; your only decision about it is whether to include it when creating a frame window. (It is unusual for a frame window not to include a system menu.) The system menu generates WM_SYSCOMMAND messages instead of WM_COMMAND messages. Most applications simply use the default behavior for WM_SYSCOMMAND messages, although applications can add, delete, and change system-menu entries. ΓòÉΓòÉΓòÉ 11.1.4. Menu Items ΓòÉΓòÉΓòÉ All menus can contain two main types of menu items: command items and submenu items. When the user chooses a command item, the menu immediately posts a message to the parent window. When the user selects a submenu item, the menu displays a submenu from which the user may choose another item. Since a submenu window also can contain a submenu item, submenus can originate from other submenus. When the user chooses a command item from a menu, the menu system posts a WM_COMMAND, WM_SYSCOMMAND, or WM_HELP message to the owner window, depending on the style bits of the menu item. Applications can change the attributes, style, and contents of menu items, and insert and delete items at run time, to reflect changes in the command environment. An application also can add items to or delete items from the menu bar, a pop-up menu, or a submenu. For example, an application might maintain a menu of the fonts currently available in the system. This application would use graphics programming interface (GPI) calls to determine which fonts were available and, then, insert a menu item for each font into a submenu. Furthermore, the application might set the check-mark attribute of the menu item for the currently chosen font. When the user chose a new font, the application would remove the check-mark attribute from the previous choice and add it to the new choice. ΓòÉΓòÉΓòÉ 11.1.4.1. The Help Item ΓòÉΓòÉΓòÉ To present a standard interface to the novice user, all applications must have a Help item in their menu bars. The Help item is defined with a particular style, attributes, and position in the menu. When the user chooses the Help item, the menu posts a WM_HELP message to the owner window, enabling the application to respond appropriately. The item should read Help, have an identifier of 0, and have the MIS_BUTTONSEPARATOR or MIS_HELP item styles. The Help menu item should be the last item in the menu template, so that it is displayed as the rightmost item in the menu bar. If an application uses the system default accelerator table, the user can select the Help item using either a mouse or the F1 key. ΓòÉΓòÉΓòÉ 11.1.4.2. Menu-Item Styles ΓòÉΓòÉΓòÉ All menu items have a combination of style bits that determine what kind of data the item contains and what kind of message it generates when the user selects it. For example, a menu item can have the MIS_TEXT, MIS_BITMAP, or other styles that specify the visual representation of the menu item on the screen. Other styles determine what kinds of messages the item sends to its owner and whether the owner draws the item. Menu-item styles typically do not change during program execution, but you can query and set them dynamically by sending MM_QUERYITEM and MM_SETITEM messages with the menu-item identifier to the menu-bar window. For text menu items (MIS_TEXT), an MM_SETITEMTEXT message sets the text. The MM_QUERYITEMTEXT message queries the text of the item. For non-text menu items, the hItem field of the MENUITEM structure typically contains the handle of a display object, such as a bit-map handle for MIS_BITMAP menu items. An application can draw a menu item by setting the style MIS_OWNERDRAW for the menu item. This usually is done by specifying the MIS_OWNERDRAW style for the menu item in the resource-definition file; but it also can be done at run time. When the application draws a menu item, it must respond to messages from the menu each time the item must be drawn. ΓòÉΓòÉΓòÉ 11.1.4.3. Menu-Item Attributes ΓòÉΓòÉΓòÉ Menu items have attributes that determine how the items are displayed and whether or not the user can choose them. An application can set and query menu-item attributes by sending MM_SETITEMATTR and MM_QUERYITEMATTR messages, with the menu-item identifier, to the menu-bar window. If the specified item is in a submenu, there are two methods of determining its attributes. The first is to send MM_SETITEMATTR and MM_QUERYITEMATTR messages to the top-level menu, specifying the identifier of the item and setting a flag so that the message searches all submenus for the item. Then, you can retrieve the handle of the menu-bar by calling WinWindowFromID, with the handle of the frame window and the FID_MENU frame-control identifier. The second method, which is more efficient if you want to either work with more than one submenu item or set the same item several times, involves two steps: 1. Send an MM_QUERYITEM message to the menu, with the identifier of the submenu. The updated MENUITEM structure contains the window handle of the submenu. 2. Send an MM_QUERYITEMATTR (or MM_SETITEMATTR) message to the submenu window, specifying the identifier of the item in the submenu. ΓòÉΓòÉΓòÉ 11.1.4.4. Menu-Item Structure ΓòÉΓòÉΓòÉ A single menu item is defined by the MENUITEM data structure. This structure is used with the MM_INSERTITEM message to insert items in a menu or to query and set item characteristics with the MM_QUERYITEM and MM_SETITEM messages. The MENUITEM structure has the following form: typedef struct _MENUITEM { /* mi */ SHORT iPosition; USHORT afStyle; USHORT afAttribute; USHORT id; HWND hwndSubMenu; ULONG hItem; } MENUITEM; You can derive the values of most of the fields in this structure directly from the resource-definition file. However, the last field in the structure, hItem, depends on the style of the menu item. The iPosition field specifies the ordinal position of the item within its menu window. If the item is part of the menu bar, iPosition specifies its relative left-to-right position, with 0 being the leftmost item. If the item is part of a submenu, iPosition specifies its relative top-to-bottom and left-to-right positions, with 0 being the upper-left item. An item with the MIS_BREAKSEPARATOR style in a pull-down menu causes a new column to begin. The afStyle field contains the style bits of the item. The afAttribute field contains the attribute bits. The id field contains the menu-item identifier. The identifier should be unique but does not have to be. Just remember that, when multiple items have the same identifier, they post the same command number in the WM_COMMAND, WM_SYSCOMMAND, and WM_HELP messages. Also, any message that specifies a menu item with a non-unique identifier will find the first item that has that identifier. The hwndSubMenu field contains the window handle of a submenu window (if the item is a submenu item). The hwndSubMenu field is NULL for command items. The hItem field contains a handle to the display object for the item, unless the item has the MIS_TEXT style, in which case, hItem is 0. For example, a menu item with the MIS_BITMAP style has an hItem field that is equal to its bit-map handle. ΓòÉΓòÉΓòÉ 11.1.5. Menu Access ΓòÉΓòÉΓòÉ The OS/2 operating system is designed to work with or without a mouse or other pointing device. The system provides default behavior that enables a user to interact with menus without a mouse. Following are the keystrokes that produce this default behavior: Keystroke Menu Access ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéKeystroke ΓöéAction Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAlt ΓöéToggles in and out of menu-bar mode. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAlt+Spacebar ΓöéShows the system menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéF10 ΓöéBacks up one level. If a submenu is Γöé Γöé Γöédisplayed, it is canceled. If no submenu is Γöé Γöé Γöédisplayed, this keystroke exits the menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéShift+Esc ΓöéShows the system menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRight Arrow ΓöéCycles to the next top-level menu item. If Γöé Γöé Γöéthe selected item is at the far-left side of Γöé Γöé Γöéthe menu, the menu code sends a WM_NEXTMENU Γöé Γöé Γöémessage to the frame window. The default Γöé Γöé Γöéprocessing by the frame window is to cycle Γöé Γöé Γöébetween the application and system menus. (AnΓöé Γöé Γöéapplication can modify this behavior by Γöé Γöé Γöésubclassing the frame window.) If the Γöé Γöé Γöéselected item is in a submenu, the next Γöé Γöé Γöécolumn in the submenu is selected, or the Γöé Γöé Γöénext top-level menu item is selected; this Γöé Γöé Γöékeystroke also can send or process a Γöé Γöé ΓöéWM_NEXTMENU message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLeft Arrow ΓöéWorks like the Right Arrow key, except in theΓöé Γöé Γöéopposite direction. In submenus, this Γöé Γöé Γöékeystroke backs up one column, except when Γöé Γöé Γöéthe currently selected item is in the Γöé Γöé Γöéfar-left column, in which case the previous Γöé Γöé Γöésubmenu is selected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéUp Arrow or ΓöéWhen pressed in a top-level menu, activates aΓöé ΓöéDown Arrow Γöésubmenu. When pressed in a submenu, this Γöé Γöé Γöékeystroke selects the previous or next or Γöé Γöé Γöéitem, respectively. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEnter ΓöéActivates a submenu, and highlights the firstΓöé Γöé Γöéitem if an item has a submenu associated withΓöé Γöé Γöéit; otherwise, this keystroke chooses the Γöé Γöé Γöéitem as though the user released the mouse Γöé Γöé Γöébutton while the item was selected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAlphabetic ΓöéSelects the first menu item with the Γöé Γöécharacter Γöéspecified character as its mnemonic key. A Γöé Γöé Γöémnemonic is defined for a menu item by Γöé Γöé Γöéplacing a tilde (~) before the character in Γöé Γöé Γöéthe menu text. If the selected item has a Γöé Γöé Γöésubmenu associated with it, the menu is Γöé Γöé Γöédisplayed, and the first item is highlighted;Γöé Γöé Γöéotherwise, the item is chosen. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ An application does not support the default keyboard behavior with any unusual code; instead, the application receives a message when a menu item is chosen by the keyboard just as though it had been chosen by a mouse. ΓòÉΓòÉΓòÉ 11.1.5.1. Mnemonics ΓòÉΓòÉΓòÉ Adding mnemonics to menu items is one way of providing the user with keyboard access to menus. You can indicate a mnemonic keystroke for a menu item by preceding a character in the item text with a tilde, as in ~nFile. Then, the user can choose that item by pressing the mnemonic key when the menu is active. The following figure shows the result on screen. Examples of Mnemonics The menu bar is active when the user presses and releases the Alt key, and the first item in the menu bar is highlighted. A pop-up or pull-down menu is active when it is open. ΓòÉΓòÉΓòÉ 11.1.5.2. Accelerators ΓòÉΓòÉΓòÉ In addition to mnemonics, a menu item can have an associated keyboard accelerator. Accelerators are different from mnemonics in that the menu need not be active for the accelerator key to work. If you have associated a menu item with a keyboard accelerator, display the accelerator to the right of the menu item. Do this in the resource-definition file by placing a tab character (\t) in the menu text before the characters that will be displayed on the right. For example, if the Close item had the F3 function key as its keyboard accelerator, the text for the item would be Close\tF3. ΓòÉΓòÉΓòÉ 11.2. Using Menus ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Define menu items in a resource file. o Include a menu bar in a standard window. o Create a pop-up menu. o Add a menu to a dialog window. o Access the system menu. o Respond to a the menu choice of a user. o Set and query menu-item attributes. o Add and delete menu items. o Create a custom menu item. ΓòÉΓòÉΓòÉ 11.2.1. Defining Menu Items in a Resource File ΓòÉΓòÉΓòÉ Typically, a menu resource represents the menu bar or pop-up menu and all the related submenus. A menu-item definition is organized as shown in the following code: MENUITEM item text, item identifier, item style, item attributes The menu resource-definition file specifies the text of each item in the menu, its unique identifier, its style and attributes, and whether it is a command item or a submenu item. A menu item that has no specification for style or attributes has the default style of MIS_TEXT and all attribute bits off, indicating that the item is enabled. The MIS_SEPARATOR style identifies nonselectable lines between menu items. The following figure is sample Resource Compiler source code that defines a menu resource. The code defines a menu with three submenu items in the menu bar (File, Edit, and Font) and a command item (Help). Each submenu has several command items, and the Font submenu has two other submenus within it. ResourceCompilerCodeDefiningaMenuResource MENU ID_MENU_RESOURCE BEGIN SUBMENU "~File", IDM_FILE BEGIN MENUITEM "~Open...", IDM_FI_OPEN MENUITEM "~Close\tF3", IDM_FI_CLOSE, 0, MIA_DISABLED MENUITEM "~Quit", IDM_FI_QUIT MENUITEM "", IDM_FI_SEP1, MIS_SEPARATOR MENUITEM "~About Sample", IDM_FI_ABOUT END SUBMENU "~Edit", IDM_EDIT BEGIN MENUITEM "~Undo", IDM_ED_UNDO, 0, MIA_DISABLED MENUITEM "", IDM_ED_SEP1, MIS_SEPARATOR MENUITEM "~Cut", IDM_ED_CUT MENUITEM "C~opy", IDM_ED_COPY MENUITEM "~Paste", IDM_ED_PASTE MENUITEM "C~lear", IDM_ED_CLEAR END SUBMENU "Font", IDM_FONT BEGIN SUBMENU "Style", IDM_FONT_STYLE BEGIN MENUITEM "Plain", IDM_FONT_STYLE_PLAIN MENUITEM "Bold", IDM_FONT_STYLE_BOLD MENUITEM "Italic", IDM_FONT_STYLE_ITALIC END SUBMENU "Size", IDM_FONT_SIZE BEGIN MENUITEM "10", IDM_FONT_SIZE_10 MENUITEM "12", IDM_FONT_SIZE_12 MENUITEM "14", IDM_FONT_SIZE_14 END END MENUITEM "F1=Help", 0x00, MIS_TEXT | MIS_BUTTONSEPARATOR | MIS_HELP END To define a menu item with the MIS_BITMAP style, an application must use a tool such as Icon Editor to create a bit map, include the bit map in its resource-definition file, and define a menu in the file (as shown in the following figure). The text for the bit map menu items is an ASCII representation of the resource identifier of the bit map resource to be displayed for that item. DefiningaMenuwiththeMIS _ BITMAPStyle /* Bring externally created bit maps into the resource file. */ BITMAP 101 button.bmp BITMAP 102 hirest.bmp BITMAP 103 hizoom.bmp BITMAP 104 hired.bmp /* Connect a menu item with a bit map. */ SUBMENU "~Bitmaps", IDM_BITMAP BEGIN MENUITEM "#101", IDM_BM_01, MIS_BITMAP MENUITEM "#102", IDM_BM_02, MIS_BITMAP MENUITEM "#103", IDM_BM_03, MIS_BITMAP MENUITEM "#104", IDM_BM_04, MIS_BITMAP END ΓòÉΓòÉΓòÉ 11.2.2. Including a Menu Bar in a Standard Window ΓòÉΓòÉΓòÉ If you have defined a menu resource in a resource-definition file, you can use the menu resource to create a menu bar in a standard window. You include the menu bar by using the FCF_MENU attribute flag and specifying the menu-resource identifier in a call to WinCreateStdWindow, as shown in the following code fragment: #define ID_MENU_RESOURCE 100 HWND hwndFrame; CHAR szClassName[]="MyClass"; CHAR szTitle[]="My Title"; ULONG flControlStyle = FCF_MENU | FCF_SIZEBORDER | FCF_TITLEBAR | FCF_ACCELTABLE; hwndFrame = WinCreateStdWindow(HWND_DESKTOP, WS_VISIBLE, &flControlStyle, szClassName, szTitle, 0, (HMODULE) NULL, ID_MENU_RESOURCE, NULL); After you make this call, the operating system automatically includes the menu in the window, drawing the menu bar across the top of the window. When the user chooses an item from the menu, the menu posts the message to the frame window. The frame window passes any WM_COMMAND messages to the client window. (The frame window does not pass WM_SYSCOMMAND messages to the client window.) WM_HELP messages are posted to the focus window. The WinDefWindowProc function passes WM_HELP messages to the parent window. If a WM_HELP message is passed to a frame window, the frame window calls the HK_HELP hook. Your client window procedure must process these messages to respond to the user's actions. ΓòÉΓòÉΓòÉ 11.2.3. Creating a Pop-up Menu ΓòÉΓòÉΓòÉ The following code fragment shows how to make a pop-up menu appear when the user double-clicks mouse button 2 anywhere in the parent window. The menu is positioned with the mouse pointer located on the item having the IDM_OPEN identifier and is constrained horizontally and vertically. Then, the user can select an item from the pop-up menu using mouse button 2. #define ID_MENU_RESOURCE 110 #define IDM_OPEN 120 HWND hwndFrame; MRESULT ClientWndProc( HWND hwnd, ULONG msg, MPARAM mp1, MPARAM mp2) { HWND hwndMenu; BOOL fSuccess; switch (msg) { . . /* Process other messages. */ . case WM_BUTTON2DBLCLK: hwndMenu = WinLoadMenu(hwnd, (HMODULE) NULL, ID_MENU_RESOURCE); fSuccess = WinPopupMenu(hwnd, hwndFrame, hwndMenu, 20, 50, IDM_OPEN, PU_POSITIONONITEM | PU_HCONSTRAIN | PU_VCONSTRAIN | PU_MOUSEBUTTON2DOWN | PU_MOUSEBUTTON2); . . . ΓòÉΓòÉΓòÉ 11.2.4. Adding a Menu to a Dialog Window ΓòÉΓòÉΓòÉ You might want to use menus in windows that were not created using the WinCreateStdWindow function. For these windows, you can load a menu resource by using the WinLoadMenu function and specifying the parent window for the menu. WinLoadMenu assigns the specified menu resource to the parent. To see the menu in the window, you must send a WM_UPDATEFRAME message to the parent after loading the menu resource. This strategy is especially useful for adding menus to a window created as a dialog window, but it can be used no matter what type of window is specified as the parent. ΓòÉΓòÉΓòÉ 11.2.5. Accessing the System Menu ΓòÉΓòÉΓòÉ Although most applications do not alter the system menu, you can obtain the handle of the system menu by calling WinWindowFromID with a frame-window handle (or dialog-window handle) and the identifier FID_SYSMENU. Once you have the handle of the system menu, you can access the individual menu items by using predefined constants. For example, the following code fragment shows how to disable the Close menu item in the system menu of a window: HWND hwndSysMenu; HWND hwndFrame; hwndSysMenu = WinWindowFromID(hwndFrame, FID_SYSMENU); WinSendMsg(hwndSysMenu, MM_SETITEMATTR, MPFROM2SHORT(SC_CLOSE, TRUE), MPFROM2SHORT(MIA_DISABLED, MIA_DISABLED)); ΓòÉΓòÉΓòÉ 11.2.6. Responding to a User's Menu Choice ΓòÉΓòÉΓòÉ When a user chooses a menu item, the client window procedure receives a WM_COMMAND message with SHORT1FROMMP(mp1) equal to the menu identifier of the chosen item. Your application must use the menu identifier to guide its response to the choice. Typically, the code in the client window procedure resembles the following code fragment: case WM_COMMAND: DoMenuCommand(hwnd, SHORT1FROMMP(mp1)); return 0; The function that translates the menu identifier into an action typically resembles the following code fragment: VOID DoMenuCommand( HWND hwnd, USHORT usItemID) { /* Test the menu item. */ switch (usItemID) { case IDM_FI_NEW: DoNew(hwnd); break; . . /* etc. */ . } } The menu window sends a WM_MENUSELECT message every time the menu selection changes. SHORT1FROMMP(mp1) contains the identifier of the item that is changing state, and SHORT2FROMMP(mp2) is a 16-bit Boolean value that describes whether or not the item is chosen; the mp2 parameter contains the handle of the menu. If the Boolean value is FALSE, the item is selected but not chosen; for example, the user may have moved the cursor or mouse pointer over the item while the button was down. An application can use this message to display Help information at the bottom of the application window. The return value is ignored. If the Boolean value is TRUE, the item is chosen-that is, the user pressed Enter or released the mouse button while an item was selected. If the application returns FALSE, the menu does not generate a WM_COMMAND, WM_SYSCOMMAND, or WM_HELP message, and the menu is not dismissed. ΓòÉΓòÉΓòÉ 11.2.7. Setting and Querying Menu-Item Attributes ΓòÉΓòÉΓòÉ Menu-item attributes are represented in the fAttribute field of the MENUITEM data structure. Typically, attributes are set in the resource-definition file of the menu and are changed at run time as required. Applications can use the MM_SETITEMATTR and MM_QUERYITEMATTR messages to set and query attributes for a particular menu item. One of the most common uses of these messages is to check and uncheck menu items to let the user know what option is selected currently. For example, if you have a menu item that should toggle between checked and unchecked each time the user selects it, you can use the following figure to change the checked attribute. In this example, you send an MM_QUERYITEMATTR message to the menu item to obtain its current checked attribute; then, you use the exclusive OR operator to toggle the state; and finally, you send the new attribute state back to the item using an MM_SETITEMATTR message. ChangingaMenuItemtoToggleBetweenCheckedandUnchecked usAttrib = SHORT1FROMMR( WinSendMsg(hwndMenu, /* Submenu window */ MM_QUERYITEMATTR, /* Message */ (MPARAM)itemID, /* Item identifier */ (MPARAM)MIA_CHECKED /* Attribute mask */ )); usAttrib = MIA_CHECKED; /* XOR to toggle checked attribute */ WinSendMsg(hwndMenu, /* Submenu window */ MM_SETITEMATTR, /* Message */ (MPARAM)itemID, /* Item identifier */ MPFROM2SHORT(MIA_CHECKED, usAttrib)); /* Attribute mask, value */ ΓòÉΓòÉΓòÉ 11.2.8. Adding and Deleting Menu Items ΓòÉΓòÉΓòÉ An application can add and delete items from its menus dynamically by sending MM_INSERTITEM and MM_DELETEITEM messages to the menu window. Any item, including those in submenus, can be deleted by sending a message to the menu window. Messages to insert items in submenus must be sent to the submenu's window (rather than to the window of the top-level menu). You can retrieve the handle of a submenu of the menu bar by sending an MM_QUERYITEM message to the menu-bar and specifying the identifier of the submenu item for the submenu, as shown in the following code fragment: /* IDM_MYMENUID is the identifier of the submenu containing the item. */ MENUITEM mi; HWND hwndMenu, hwndSubMenu, hwndPullDown,hwndFrame; hwndMenu = WinWindowFromID(hwndFrame, FID_MENU); WinSendMsg(hwndMenu, /* Handle of menu bar */ MM_QUERYITEM, /* Message */ MPFROM2SHORT(IDM_MYMENUID, TRUE), /* Submenu identifier */ (MPARAM) &mi); /* Pointer to MENUITEM */ hwndPullDown = mi.hwndSubMenu; /* Handle to submenu */ Once the application has the handle of the submenu, it can insert an item by filling in a MENUITEM structure and sending an MM_INSERTITEM message to the submenu. For text-menu items, the application must send a pointer to the text string as well as to the MENUITEM structure, as shown in the following figure. InsertingaMenuItem PSZ pszNewItemString; mi.iPosition = MIT_END; mi.afStyle = MIS_TEXT; mi.afAttribute = 0; mi.id = IDM_MYMENU_FIRST; mi.hwndSubMenu = NULL; mi.hItem = 0; WinSendMsg(hwndPullDown, MM_INSERTITEM, (MPARAM) &mi, (MPARAM) pszNewItemString); To delete an item, the application sends an MM_DELETEITEM message to the menu bar, specifying the identifier of the item to delete. For example, to clear all the items following IDM_MYMENU_FIRST in a submenu in which the items are numbered sequentially, use the following code: USHORT usItemNum; /* Clear all the items in MYMENU. */ hwndMenu = WinWindowFromID(hwndFrame, FID_MENU); usItemNum = IDM_MYMENU_FIRST; while (WinSendMsg(hwndMenu, MM_DELETEITEM, MPFROM2SHORT(usItemNum++, TRUE), NULL) != 0); Adding a complete submenu to the menu bar is a more complicated procedure than that shown in the previous examples. There are two strategies. The recommended technique is to define all possible submenus in your resource-definition file; and then, as your application runs, selectively remove and insert the submenus as needed. For example, assume that your application has a submenu that you want to be displayed only when a particular application tool is in use. You must first define the submenu as part of the main menu resource in your resource-definition file, so that the system reads in the resource menu template and creates the submenu window along with the rest of the menu. You then can remove the submenu from the menu bar, saving the title of the submenu and the MENUITEM structure that defines the submenu, as shown in the following figure: RemovingaSubmenufromtheMenuBar HWND hwndMenu, hwndClient; MENUITEM mi; CHAR szMenuTitle[MAX_STRINGSIZE]; /* Remove a submenu so that you can replace it later. */ /* Obtain the handle of a menu. */ hwndMenu = WinWindowFromID(WinQueryWindow(hwndClient, QW_PARENT), FID_MENU); /* Obtain information on the item to remove. */ WinSendMsg(hwndMenu, MM_QUERYITEM, MPFROM2SHORT(IDM_MENUID, TRUE), /* TRUE to search submenus */ (MPARAM)&mi); /* Save the text for the submenu item. */ WinSendMsg(hwndMenu, MM_QUERYITEMTEXT, MPFROM2SHORT(IDM_FONT, MAX_STRINGSIZE), (MPARAM)szMenuTitle); /* Remove the item, but retain mi and szMenuTitle. */ WinSendMsg(hwndMenu, MM_REMOVEITEM, MPFROM2SHORT(IDM_FONT, TRUE), NULL); It is important to use the MM_REMOVEITEM message, rather than MM_DELETEITEM, to remove the item; deleting the item destroys the submenu window-removing it does not. The submenu should remain intact so that you can insert it later. To reinsert the submenu, send an MM_INSERTITEM message to the menu bar, passing the MENUITEM structure and menu title that you saved when you removed the item. The following code fragment shows how to insert a submenu that was removed by using the previous code example: /* Put the submenu back in and obtain the handle of the menu bar. */ hwndMenu = WinWindowFromID( WinQueryWindow(hwndClient, QW_PARENT), FID_MENU); /* Use the information that you saved when you removed the menu. */ WinSendMsg(hwndMenu, MM_INSERTITEM, (MPARAM)&mi, (MPARAM)szMenuTitle); The other technique that you can use to insert a submenu in the menu bar is to build up, in memory, a data structure as a menu template and use that template and WinCreateWindow to create a submenu. The resultant submenu window handle then is placed in the hwndSubMenu field of a MENUITEM structure, and the menu item is sent to the menu bar with an MM_INSERTITEM message. You also can create an empty submenu window by using WinCreateWindow. Pass NULL for the pCtlData and pPresParams parameters, instead of building the menu template in memory. Then insert a new menu item in the menu bar by using the MM_INSERTITEM message, setting the MIS_SUBMENU style, and putting the window handle of the created menu into the hwndSubMenu field. Then use the MM_INSERTITEM message to insert the items in the new pull-down menu. ΓòÉΓòÉΓòÉ 11.2.9. Creating a Custom Menu Item ΓòÉΓòÉΓòÉ Applications can customize the appearance of an individual menu item by setting the MIS_OWNERDRAW style bit for the item. The operating system sends two different messages to an application that include owner-drawn menu items: WM_MEASUREITEM and WM_DRAWITEM. Both messages include a pointer to an OWNERITEM data structure. WM_MEASUREITEM is sent only once for each owner-drawn item when the menu is initialized. The message is sent to the owner of the menu (typically, a frame window), which forwards the message to its client window. Typically, the client window procedure processes WM_MEASUREITEM by filling in the yTop and Right fields of the RECTL structure, specified by the rclItem field of this OWNERITEM structure; this specifies the size of the rectangle needed to enclose the item when it is drawn. The following code fragment responds to a WM_MEASUREITEM message. case WM_MEASUREITEM: ((POWNERITEM) mp2)->rclItem.xRight = 26; ((POWNERITEM) mp2)->rclItem.yTop = 10; return 0; If a menu item has the MIS_OWNERDRAW style, the owner window receives a WM_DRAWITEM message every time the menu item needs to be drawn. You process this message by using the hps and rclItem fields of the OWNERITEM structure to draw the item. There are two situations in which the owner window receives a WM_DRAWITEM message: o When the item must be redrawn completely o When the item must be highlighted or have its highlight removed. You can choose to handle one or both of these situations. Typically, you handle the drawing of the item. You may not want to handle the second situation, however, since the system-default behavior (inverting the bits in the item rectangle) often is acceptable. The two situations in which a WM_DRAWITEM message is received are detected by comparing the values of the fsState and fsStateOld fields of the OWNERITEM structure that is sent as part of the message. If the two fields are the same, draw the item. Before drawing the item, however, check its attributes to see whether it has the attributes MIA_CHECKED, MIA_FRAMED, or MIA_DISABLED. Then draw the item according to the attributes. For example, when the checked attribute of an owner-drawn menu item changes, the system sends a WM_DRAWITEM message to the item so that it can redraw itself and either draw or remove the check mark. If you want the system-default check mark, simply draw the item and leave the fsAttribute and fsAttributeOld fields unchanged; the system draws the check mark if necessary. If you draw the check mark yourself, clear the MIA_CHECKED bit in both fsAttribute and fsAttributeOld so that the system does not attempt to draw a check mark. In the same example, if fsAttribute and fsAttributeOld are not equal, the highlight showing that an item is selected needs to change. The MIA_HILITED bit of the fsAttribute field is set if the item needs to be highlighted and is not set if the highlight needs to be removed. If you do not want to provide your own highlighting, you should ignore any WM_DRAWITEM message in which fsAttribute and fsAttributeOld are not equal. If you do not alter these two fields, the system performs its default highlighting operation. If you want to provide your own visual cue that an item is selected, respond to a WM_DRAWITEM message in which the fsAttribute and fsAttributeOld fields are not equal by providing the cue and clearing the MIA_HILITED bit of both fields before returning from the message. Likewise, the MIA_CHECKED and MIA_FRAMED bits of fsAttribute and fsAttributeOld either can be used to perform the corresponding action or passed on, unchanged, so that the system performs the action. The following code fragment shows how to respond to a WM_DRAWITEM message when you want to draw the item and also be responsible for its highlighted state: case WM_DRAWITEM: { POWNERITEM poi; RECTL rcl; MPARAM mp2; poi = (POWNERITEM) mp2; /* * If the new attribute equals the old attribute, * redraw the entire item. */ if (poi->fsAttribute == poi->fsAttributeOld) { /* * Draw the item in poi->hps and poi->rclItem, and check the * attributes for check marks. If you produce your own check marks, * use this line of code: * * poi->fsAttributeOld = (poi->fsAttribute &= ~MIA_CHECKED; */ } /* Else highlight the item or remove its highlight. */ else if ((poi->fsAttribute & MIA_HILITED) != (poi->fsAttributeOld & MIA_HILITED)) { /* * Set bits the same so that the menu window does not highlight * the item or remove its highlight. */ poi->fsAttributeOld = (poi->fsAttribute &= ~MIA_HILITED); } return TRUE; /* TRUE means the item is drawn. */ } /* endcase */ ΓòÉΓòÉΓòÉ 11.3. Summary ΓòÉΓòÉΓòÉ This section lists the OS/2 functions, structures, and messages used with menus. Menu Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateMenu ΓöéCreates a menu window from the menu Γöé Γöé Γöétemplate. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCheckMenuItem ΓöéSets the check state of the Γöé Γöé Γöéspecified menu item to the flag. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinEnableMenuItem ΓöéSets the state of the specified menuΓöé Γöé Γöéitem to the enable flag. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinIsMenuItemChecked ΓöéReturns the state (checked/not Γöé Γöé Γöéchecked) of the identified menu Γöé Γöé Γöéitem. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinIsMenuItemEnabled ΓöéReturns the state (enable/disable) Γöé Γöé Γöéof the specified menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinIsMenuItemValid ΓöéReturns TRUE if the specified item Γöé Γöé Γöéis a valid choice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinLoadMenu ΓöéCreates a menu window from the menu Γöé Γöé Γöétemplate Menuid from Resource, and Γöé Γöé Γöéreturns in Menu the window handle Γöé Γöé Γöéfor the created window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinPopupMenu ΓöéDisplays a pop-up menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetMenuItemText ΓöéSets the text for menu indexed item Γöé Γöé Γöéto buffer. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Menu Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMENUITEM ΓöéMenu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéOWNERITEM ΓöéOwner item. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Received by a Menu ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_DELETEITEM ΓöéDeletes a menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_ENDMENUMODE ΓöéSent to a menu control to terminate Γöé Γöé Γöémenu selection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_INSERTITEM ΓöéInserts a menu item in a menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_ISITEMVALID ΓöéReturns the selectable status of a Γöé Γöé Γöéspecified menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_ITEMIDFROMPOSITION ΓöéReturns the identity of a menu item Γöé Γöé Γöéof a specified index. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_ITEMPOSITIONFROMID ΓöéReturns the index of a menu item of Γöé Γöé Γöéa particular identify. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_QUERYITEM ΓöéReturns the definition of the Γöé Γöé Γöéspecified menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_QUERYITEMATTR ΓöéReturns the attributes of a menu Γöé Γöé Γöéitem. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_QUERYITEMCOUNT ΓöéReturns the number of items in the Γöé Γöé Γöémenu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_QUERYITEMRECT ΓöéReturns the bounding rectangle of a Γöé Γöé Γöémenu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_QUERYITEMTEXT ΓöéReturns the text of the specified Γöé Γöé Γöémenu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_QUERYITEMTEXTLENGTH ΓöéReturns the text length of the Γöé Γöé Γöéspecified menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_QUERYSELITEMID ΓöéReturns the identity of the selectedΓöé Γöé Γöémenu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_REMOVEITEM ΓöéRemoves a menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_SELECTITEM ΓöéSelects or deselects a menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_SETITEM ΓöéSets the definition of a menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_SETITEMATTR ΓöéSets the attributes of a menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_SETITEMHANDLE ΓöéSets the handle of a menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_SETITEMTEXT ΓöéSets the text of a menu item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMM_STARTMENUMODE ΓöéUsed to begin menu selection. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Generated by a Menu ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ADJUSTWINDOWPOS ΓöéSent by WinSetWindowPos to enable Γöé Γöé Γöéthe window to adjust its new Γöé Γöé Γöéposition or size whenever it is Γöé Γöé Γöéabout to be moved. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 2. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 3. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_COMMAND ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner or when a keystroke has been Γöé Γöé Γöétranslated by an accelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTEXTMENU ΓöéOccurs when the operator requests a Γöé Γöé Γöépop-up menu. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to the owner window of a Γöé Γöé Γöécontrol when the pointing device Γöé Γöé Γöépointer moves over the control Γöé Γöé Γöéwindow, enabling the owner to set Γöé Γöé Γöéthe pointer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéOccurs when an application requests Γöé Γöé Γöéthe creation of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéOccurs when an application requests Γöé Γöé Γöéthe destruction of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DRAWITEM ΓöéSent to the owner of a menu control Γöé Γöé Γöéeach time an item is to be drawn. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéSets the enable state of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_FOCUSCHANGE ΓöéOccurs when the window possessing Γöé Γöé Γöéthe focus is changed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HELP ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner or when a keystroke has been Γöé Γöé Γöétranslated by an accelerator table Γöé Γöé Γöéinto a WM_HELP. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_INITMENU ΓöéOccurs when a menu control is about Γöé Γöé Γöéto become active. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MEASUREITEM ΓöéSent to the owner of a meu control Γöé Γöé Γöéto establish the height for an item Γöé Γöé Γöéin that control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MENUEND ΓöéOccurs when a menu control is about Γöé Γöé Γöéto terminate. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MENUSELECT ΓöéOccurs when a menu item has been Γöé Γöé Γöéselected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéOccurs when the pointing device Γöé Γöé Γöépointer moves. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_NEXTMENU ΓöéOccurs when either the beginning or Γöé Γöé Γöéthe end of the menu is reached usingΓöé Γöé Γöéthe cursor control keys. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéOccurs when a window needs Γöé Γöé Γöérepainting. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé Γöéconversion of DBCS characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETFOCUS ΓöéOccurs when a window is to receive Γöé Γöé Γöéor lose the input focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the menu parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SYSCOMMAND ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner or when a keystroke has been Γöé Γöé Γöétranslated by an accelerator table Γöé Γöé Γöéinto a WM_SYSCOMMAND. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 12. Entry-Field Controls ΓòÉΓòÉΓòÉ An entry field is a control window that enables a user to view and edit a single line of text. This chapter describes how to create and use entry-field controls in your PM applications. ΓòÉΓòÉΓòÉ 12.1. About Entry Fields ΓòÉΓòÉΓòÉ An entry field provides the text-editing capabilities of a simple text editor and is useful whenever an application requires a short line of text from the user as illustrated in the following figure. Example of Entry Fields If the application requires more sophisticated text-editing capabilities and multiple lines of text from the user, the application can use a multiple-line entry (MLE) field. See Multiple-Line Entry Field Controls for more information about MLE controls. Both the user and the application can edit text in an entry field. Applications typically use entry fields in dialog windows, although they can be used in non-dialog windows as well. An application creates an entry field by specifying either the WC_ENTRYFIELD window class in the WinCreateWindow function or the ENTRYFIELD statement in a resource-definition file. ΓòÉΓòÉΓòÉ 12.1.1. Entry-Field Styles ΓòÉΓòÉΓòÉ An entry field has a style that determines how it appears and behaves. An application specifies the style in either the WinCreateWindow function or the ENTRYFIELD statement in a resource-definition file. An application can specify a combination of the following styles for an entry field. Entry-Field Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_ANY ΓöéAllows the entry-field text to contain a Γöé Γöé Γöémixture of double-byte and single-byte Γöé Γöé Γöécharacters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_AUTOSCROLL ΓöéAutomatically scrolls text horizontally to Γöé Γöé Γöéshow the insertion point. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_AUTOSIZE ΓöéAutomatically sets the size of the entry Γöé Γöé Γöéfield, based on the width of the field's textΓöé Γöé Γöéstring and the metrics of the current system Γöé Γöé Γöéfont. This style can set the width, height, Γöé Γöé Γöéor both-whichever has a value of -1 in the Γöé Γöé ΓöéWinCreateWindow function or Γöé Γöé Γöéresource-definition file. This style affectsΓöé Γöé Γöéonly the initial size of the entry field; it Γöé Γöé Γöédoes not adjust the size as the font or Γöé Γöé Γöétext-string width changes. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_AUTOTAB ΓöéAutomatically moves the cursor to the next Γöé Γöé Γöécontrol window when the user enters the Γöé Γöé Γöémaximum number of characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_CENTER ΓöéCenters text within the entry field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_DBCS ΓöéSpecifies that the entry-field text consist Γöé Γöé Γöéof double-byte characters only. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_LEFT ΓöéLeft-aligns text within the entry field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_MARGIN ΓöéDraws a border around the entry field. The Γöé Γöé Γöéborder is 1/2-character wide and Γöé Γöé Γöé1/4-character high. Without this style, the Γöé Γöé Γöéapplication draws no border around the entry Γöé Γöé Γöéfield. The width of the entry-field rectangleΓöé Γöé Γöéis increased on all sides by the width of Γöé Γöé Γöéthis margin. After an entry field with the Γöé Γöé ΓöéES_MARGIN style is created, the Γöé Γöé ΓöéWinQueryWindowRect function returns a larger Γöé Γöé Γöérectangle that includes this margin and whoseΓöé Γöé Γöéorigin, therefore, is different from the Γöé Γöé Γöéorigin specified when the entry field was Γöé Γöé Γöécreated. If an application does not adjust Γöé Γöé Γöéfor this size difference when moving or Γöé Γöé Γöésizing an entry field, the entry field Γöé Γöé Γöébecomes larger after each moving and sizing Γöé Γöé Γöéoperation. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_MIXED ΓöéAllows the entry-field text to contain a Γöé Γöé Γöémixture of single-byte and double-byte Γöé Γöé Γöécharacters. Unlike the ES_ANY style, this Γöé Γöé Γöéstyle lets ASCII DBCS data be converted to Γöé Γöé ΓöéEBCDIC DBCS data without causing an overflow Γöé Γöé Γöécondition. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_READONLY ΓöéPrevents the user from entering or editing Γöé Γöé Γöétext in the entry field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_RIGHT ΓöéRight-aligns text within the entry field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_SBCS ΓöéSpecifies that the entry-field text must Γöé Γöé Γöéconsist of single-byte characters only. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéES_UNREADABLE ΓöéDisplays each character as an asterisk (*). Γöé Γöé ΓöéThis style is useful when obtaining a Γöé Γöé Γöépassword from the user. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 12.1.2. Entry-Field Notification Codes ΓòÉΓòÉΓòÉ An entry field is always owned by another window. A WM_CONTROL notification message is sent to the owner whenever an event occurs in the entry field. This message contains a notification code that specifies the exact nature of the event. An entry field can send the notification codes described in the following table to its owner. Notification of Entry-Field Events ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéNotification Code ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEN_CHANGE ΓöéIndicates that the contents of an Γöé Γöé Γöéentry field have changed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEN_INSERTMODETOGGLE ΓöéIndicates that the insert mode has Γöé Γöé Γöébeen toggled. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEN_KILLFOCUS ΓöéIndicates that an entry field has Γöé Γöé Γöélost the keyboard focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEN_MEMERROR ΓöéIndicates that an entry field cannotΓöé Γöé Γöéallocate enough memory to perform Γöé Γöé Γöéthe requested operation, such as Γöé Γöé Γöéextending the text limit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEN_OVERFLOW ΓöéIndicates that either the user or Γöé Γöé Γöéthe application attempted to exceed Γöé Γöé Γöéthe text limit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEN_SCROLL ΓöéIndicates that the text in an entry Γöé Γöé Γöéfield is about to scroll. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEN_SETFOCUS ΓöéIndicates that an entry field Γöé Γöé Γöéreceived the keyboard focus. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ An application typically ignores notification messages from an entry field, thus allowing default text editing to occur. For more specialized uses, an application can use notification messages to filter input. For example, if an entry field is intended for numbers only, an application can use the EN_CHANGE notification code to check the contents of the entry field each time the user enters a non-numeric character. As an alternative, an application can prevent inappropriate characters from reaching an entry field by using EN_SETFOCUS and EN_KILLFOCUS, in filter code, placed in the main message loop. Whenever the entry field has the keyboard focus, the filter code can intercept and filter WM_CHAR messages before the WinDispatchMsg function passes them to the entry field. An application also can respond to certain keystrokes, such as the Enter key, as long as the entry-field control has the keyboard focus. ΓòÉΓòÉΓòÉ 12.1.3. Default Entry-Field Behavior ΓòÉΓòÉΓòÉ The following table lists and describes all the messages specifically handled by the predefined entry-field control-window class (WC_ENTRYFIELD). Messages Handled by WC_ENTRYFIELD Class ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_CLEAR ΓöéDeletes the current text selection Γöé Γöé Γöéfrom the control window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_COPY ΓöéCopies the current text selection toΓöé Γöé Γöéthe system clipboard, in CF_TEXT Γöé Γöé Γöéformat. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_CUT ΓöéCopies the current text selection toΓöé Γöé Γöéthe system clipboard, in CF_TEXT Γöé Γöé Γöéformat, and deletes the selection Γöé Γöé Γöéfrom the control window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_PASTE ΓöéCopies the current contents of the Γöé Γöé Γöésystem clipboard that have CF_TEXT Γöé Γöé Γöéformat, replacing the current text Γöé Γöé Γöéselection in the control window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYCHANGED ΓöéReturns TRUE if the text has changedΓöé Γöé Γöésince the last EM_QUERYCHANGED Γöé Γöé Γöémessage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYFIRSTCHAR ΓöéReturns the offset to the first Γöé Γöé Γöécharacter visible at the left edge Γöé Γöé Γöéof the control window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYREADONLY ΓöéDetermines whether the entry field Γöé Γöé Γöéis in the read-only state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYSEL ΓöéReturns a long word that contains Γöé Γöé Γöéthe offsets for the first and last Γöé Γöé Γöécharacters of the current selection Γöé Γöé Γöéin the control window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETFIRSTCHAR ΓöéScrolls the text so that the Γöé Γöé Γöécharacter at the specified offset isΓöé Γöé Γöéthe first character visible at the Γöé Γöé Γöéleft edge of the control window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETINSERTMODE ΓöéToggles the text-entry mode between Γöé Γöé Γöéinsert and overstrike. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETREADONLY ΓöéSets the entry field to the Γöé Γöé Γöéread-only state. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETSEL ΓöéSets the current selection to the Γöé Γöé Γöéspecified character offsets. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETTEXTLIMIT ΓöéAllocates memory from the control Γöé Γöé Γöéheap for the specified maximum Γöé Γöé Γöénumber of characters, returning TRUEΓöé Γöé Γöéif it is successful and FALSE if it Γöé Γöé Γöéis not. Failure causes the entry Γöé Γöé Γöéfield to send a WM_CONTROL message Γöé Γöé Γöéwith the EN_MEMERROR notification Γöé Γöé Γöécode to the owner window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ADJUSTWINDOWPOS ΓöéChanges the size of the control Γöé Γöé Γöérectangle if the control has the Γöé Γöé ΓöéES_MARGIN style. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéOccurs when the user presses mouse Γöé Γöé Γöébutton 1 twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéSets the mouse capture and keyboard Γöé Γöé Γöéfocus to the entry field, and Γöé Γöé Γöéprepares to track the movement of Γöé Γöé Γöéthe mouse during WM_MOUSEMOVE Γöé Γöé Γöémessages. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1UP ΓöéReleases the mouse. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON2DOWN ΓöéReturns TRUE to prevent this messageΓöé Γöé Γöéfrom being processed further. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON3DOWN ΓöéReturns TRUE to prevent this messageΓöé Γöé Γöéfrom being processed further. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéHandles text entry and other Γöé Γöé Γöékeyboard input events. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéValidates the requested style and Γöé Γöé Γöésets the window text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéFrees the memory used for the windowΓöé Γöé Γöétext. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéSent when an application changes theΓöé Γöé Γöéenabled state of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéIf the mouse button is down, the Γöé Γöé Γöéentry field tracks the text Γöé Γöé Γöéselection. If the mouse button is Γöé Γöé Γöéup, the entry field sets the mouse Γöé Γöé Γöépointer to the default arrow shape. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéDraws the entry field and text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYDLGCODE ΓöéReturns the predefined Γöé Γöé ΓöéDLGC_ENTRYFIELD constant. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéReturns the requested window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETFOCUS ΓöéIf the entry field is gaining the Γöé Γöé Γöéfocus, it creates a cursor and sendsΓöé Γöé Γöéthe owner window a WM_CONTROL Γöé Γöé Γöémessage with the EN_SETFOCUS Γöé Γöé Γöénotification code. If the entry Γöé Γöé Γöéfield is losing the focus, it Γöé Γöé Γöédestroys the current cursor and Γöé Γöé Γöésends the owner window a WM_CONTROL Γöé Γöé Γöémessage with the EN_KILLFOCUS Γöé Γöé Γöénotification code. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETSELECTION ΓöéToggles the current selection Γöé Γöé Γöéstatus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéSets the specified window Γöé Γöé Γöéparameters, redraws the entry field,Γöé Γöé Γöéand sends the owner window a Γöé Γöé ΓöéWM_CONTROL message with the Γöé Γöé ΓöéEN_CHANGE notification code. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TIMER ΓöéBlinks the insertion point if the Γöé Γöé Γöéentry field has the focus. The entryΓöé Γöé Γöéfield scrolls the text, if Γöé Γöé Γöénecessary, while extending the Γöé Γöé Γöéselection to text that becomes Γöé Γöé Γöévisible in the window. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 12.1.4. Entry-Field Text Editing ΓòÉΓòÉΓòÉ The user can insert (type) text or numeric values in an entry field when that entry field has the keyboard focus. An application can insert text by using the WinSetWindowText function. An application can insert numeric values by using the WinSetDlgItemShort function. The text or numeric value is inserted into the entry field at the cursor position. The entry field's entry mode, either insert or overstrike, determines what happens when the user enters text. The user sets the entry mode by pressing the Insert key; the entry mode toggles each time the Insert key is pressed. The application can set the entry mode by sending the EM_SETINSERTMODE message to the entry field. The cursor position, identified by a blinking bar, is specified by a character offset relative to the beginning of the text. The user can set the cursor position by using the mouse or the Arrow keys. An application can set the cursor position by using the EM_SETSEL message. This message directs the entry field to move the blinking bar to the given character position. The EM_SETSEL message also sets the selection. The selection is one or more characters of text on which the entry field carries out an operation, such as deleting or copying to the clipboard. The user selects text by pressing the Shift key while moving the cursor, or by pressing mouse button 1 while moving the mouse. An application selects text by using the EM_SETSEL message to specify the cursor position and the anchor point. The selection includes all text between the cursor position and the anchor point. If the cursor position and anchor point are equal, there is no selection. An application can retrieve the selection (cursor position and anchor point) by using the EM_QUERYSEL message. The user can delete characters, one at a time, by pressing the Delete key or the Backspace key. The Delete key deletes the character to the right of the cursor; the Backspace key deletes the character to the left of the cursor. The user also can delete a group of characters by selecting them and pressing the Delete key. An application can delete selected text by using the EM_CLEAR message. An application can use the EM_QUERYCHANGED message to determine whether the contents of an entry field have changed. An application can prevent the user from editing an entry field by setting the ES_READONLY style in the WinCreateWindow function or in the ENTRYFIELD statement in the resource-definition file. The application also can set and query the read-only state by using the EM_SETREADONLY and ES_QUERYREADONLY messages. If text extends beyond the left or right edges of an entry field, the user can scroll the text by using the Arrow keys. An application can scroll the text by using the EM_SETFIRSTCHAR message to specify the first character visible at the left edge of the entry field. For scrolling to occur, the entry field must have the ES_AUTOSCROLL style. An application can use the EM_QUERYFIRSTCHAR message to obtain the first character that is currently visible. ΓòÉΓòÉΓòÉ 12.1.5. Entry-Field Control Copy and Paste Operations ΓòÉΓòÉΓòÉ The user can cut, copy, and paste text in an entry field by using the Shift+Delete and Ctrl+Insert key combinations. An application, either by itself or in response to the user, can cut, copy, and paste text by using the EM_CUT, EM_COPY, and EM_PASTE messages. An application can use the ES_CUT and EM_COPY messages to copy the selected text to the clipboard. The EM_CUT message also deletes the text (EM_COPY does not). The EM_PASTE message copies the text on the clipboard to the current position in the entry field, replacing any existing text with the copied text. An application can delete the selected text, without copying it to the clipboard, by using the EM_CLEAR message. ΓòÉΓòÉΓòÉ 12.1.6. Entry-Field Text Retrieval ΓòÉΓòÉΓòÉ An application can retrieve selected text from an entry field by calling WinQueryWindowText and then sending an EM_QUERYSEL message to retrieve the offsets to the first and last characters of the text selection. These offsets are used to retrieve selected text. An application can retrieve numeric values by calling WinQueryDlgItemShort, passing the entry-field identifier and the handle of the owner window. WinQueryDlgItemShort converts the entry-field text to a signed or unsigned integer and returns the value in a specified variable. The application can use the WinWindowFromID function to retrieve the handle of the control window. The entry-field identifier is specified in the dialog template in the application's resource-definition file. ΓòÉΓòÉΓòÉ 12.2. Using Entry-Field Controls ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Create an entry field in a dialog or client window. o Change the default size of the entry field. ΓòÉΓòÉΓòÉ 12.2.1. Creating an Entry Field in a Dialog Window ΓòÉΓòÉΓòÉ A dialog window usually serves as the parent and owner of an entry field. The dialog window often includes a button that indicates whether the user wants to carry out an operation. When the user selects the button, the application queries the contents of the entry field and proceeds with the operation. The definition of an entry field in an application's resource-definition file sets the initial text, window identifier, size, position, and style of the entry field. The following example shows how to define an entry field as part of a dialog template: DLGTEMPLATE IDD_SAMPLE BEGIN DIALOG "Sample Dialog", ID_DLG, 7, 7, 253, 145, FS_DLGBORDER,0 BEGIN DEFPUSHBUTTON "~OK", DID_OK, 8, 151, 50, 23, WS_GROUP ENTRYFIELD "Here is some text", ID_ENTFLD, 42, 46, 68, 15, ES_MARGIN | ES_AUTOSCROLL END END ΓòÉΓòÉΓòÉ 12.2.2. Creating an Entry Field in a Client Window ΓòÉΓòÉΓòÉ To create an entry field in a non-dialog window, an application calls WinCreateWindow with the window class WC_ENTRYFIELD. The entry field is owned by an application's client window, whose window procedure receives notification messages from the entry field. The following code fragment shows how to create an entry field in a client window: CodeforCreatinganEntryFieldinaClientWindow #define ID_ENTRYFIELD 5 HWND hwnd, hwndEntryField1, hwndClient; LONG xPos = 50, yPos = 100; LONG xWidth = 100, yHeight = 20; hwndEntryField1 = WinCreateWindow( hwndClient, /* Parent-window handle */ WC_ENTRYFIELD, /* Window class */ "initial text", /* Initial text */ WS_VISIBLE | /* Visible when created */ ES_AUTOSCROLL | /* Scroll text */ ES_MARGIN, /* Create a border */ xPos, yPos, /* x and y position */ xWidth, yHeight, /* Width and height */ hwnd, /* Owner-window handle */ HWND_TOP, /* Z-order position */ ID_ENTRYFIELD, /* Window identifier */ NULL, /* No control data */ NULL); /* No pres. parameters */ ΓòÉΓòÉΓòÉ 12.2.3. Changing the Default Size of an Entry Field ΓòÉΓòÉΓòÉ The default text limit of an entry field is 32 characters. An application can set a non-default size when creating an entry field by setting the cchEditLimit member of an ENTRYFDATA structure and supplying a pointer to the structure as the pCtlData parameter to WinCreateWindow. The following code fragment creates an entry field with a text limit of 12 characters: CodeforCreatingEntryFieldwith12 - CharacterTextLimit HWND hwndEntryField2; HWND hwndClient; ENTRYFDATA efd; LONG xPos = 50, yPos = 50; LONG xWidth = -1, yHeight = -1; /* must be -1 for ES_AUTOSIZE */ /* Initialize the ENTRYFDATA structure. */ efd.cb = sizeof(ENTRYFDATA); efd.cchEditLimit = 12; efd.ichMinSel = 0; efd.ichMaxSel = 0; /* Create the entry field. */ hwndEntryField2 = WinCreateWindow( hwndClient, /* Parent-window handle */ WC_ENTRYFIELD, /* Window class */ "projects.xls", /* No initial text */ WS_VISIBLE | /* Visible when created */ ES_MARGIN | /* Create a border. */ ES_AUTOSIZE, /* System sets the size */ xPos, yPos, /* x and y positions */ xWidth, yHeight, /* Width and height */ hwndClient, /* Owner-window handle */ HWND_TOP, /* Z-order position */ 0, /* Window identifier */ &efd, /* Control data */ NULL); /* No pres. parameters */ To expand or reduce the text limit after creating the entry field, an application can send an EM_SETTEXTLIMIT message specifying a new maximum text limit for the entry field. The following code fragment increases to 20 characters the text limit of the entry field created in the previous example: CodeforCreatingEntryFieldwith20 - CharacterTextLimit WinSendMsg(hwndEntryField2, EM_SETTEXTLIMIT, (MPARAM)20, (MPARAM)0); ΓòÉΓòÉΓòÉ 12.2.4. Retrieving Text From an Entry Field ΓòÉΓòÉΓòÉ An application can use the WinQueryWindowTextLength and WinQueryWindowText functions to retrieve the text from an entry field. WinQueryWindowTextLength returns the length of the text; WinQueryWindowText copies the window text to a buffer. Typically, an application needs to retrieve the text from an entry field only if the user changes the text. An entry field sends an EN_CHANGE notification code in the low word of the first message parameter of the WM_CONTROL message whenever the text changes. The following code fragment sets a flag when it receives the EN_CHANGE code, checks the flag during the WM_COMMAND message and, if it is set, retrieves the text of the entry field: CodeforFlaggingaTextChangeinanEntryField HWND hwnd; ULONG msg; MPARAM mp1; CHAR chBuf[64]; HWND hwndEntryField; LONG cbTextLen; LONG cbTextRead; static BOOL fFieldChanged = FALSE; switch (msg) { case WM_CONTROL: switch (SHORT1FROMMP(mp1)) { case IDD_ENTRYFIELD: /* Check if the user changed the entry-field text. */ if ((USHORT) SHORT2FROMMP(mp1) == EN_CHANGE) fFieldChanged = TRUE; return 0; } case WM_COMMAND: switch (SHORT1FROMMP(mp1)) { case DID_OK: /* If the user changed the entry-field text, */ /* obtain the text and store it in a buffer. */ if (fFieldChanged) { hwndEntryField = WinWindowFromID(hwnd, IDD_ENTRYFIELD); cbTextLen = WinQueryWindowTextLength(hwndEntryField); cbTextRead = WinQueryWindowText(hwndEntryField, sizeof(chBuf), chBuf); . . /* Do something with the text. */ . } WinDismissDlg(hwnd, 1); return 0; } } ΓòÉΓòÉΓòÉ 12.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions, structures, and messages used with entry-field controls. Entry-Field Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryDlgItemShort ΓöéConverts the text of a dialog item Γöé Γöé Γöéinto an integer value. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowText ΓöéCopies window text into a buffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryWindowTextLengthΓöéReturns the length of the window Γöé Γöé Γöétext, excluding any NULL terminationΓöé Γöé Γöécharacter. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetDlgItemShort ΓöéConverts an integer value into the Γöé Γöé Γöétext of a dialog item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowText ΓöéSets the window text for a specifiedΓöé Γöé Γöéwindow. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Entry-Field Structure ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéENTRYFDATA ΓöéEntry-field data structure Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Sent to an Entry Field ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_CLEAR ΓöéDeletes the text that forms the Γöé Γöé Γöécurrent selection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_COPY ΓöéSends the current selection to the Γöé Γöé Γöéclipboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_CUT ΓöéSends the text that forms the Γöé Γöé Γöécurrent selection to the clipboard, Γöé Γöé Γöéthen deletes it from the entry fieldΓöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_PASTE ΓöéReplaces the text that forms the Γöé Γöé Γöécurrent selection with text from theΓöé Γöé Γöéclipboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYCHANGED ΓöéQueries whether the text of the Γöé Γöé Γöéentry field control has been changedΓöé Γöé Γöésince the last inquiry. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYFIRSTCHAR ΓöéReturns the zero-based offset of theΓöé Γöé Γöéfirst character displayed in the Γöé Γöé Γöéentry field control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYREADONLY ΓöéReturns the read-only state of an Γöé Γöé Γöéentry field control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_QUERYSEL ΓöéGets the zero-based offsets of the Γöé Γöé Γöébounds of the text that forms the Γöé Γöé Γöécurrent selection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETFIRSTCHAR ΓöéSpecifies the offset of the Γöé Γöé Γöécharacter to be displayed in the Γöé Γöé Γöéfirst position of the entry field Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETINSERTMODE ΓöéSets the insert mode of an entry Γöé Γöé Γöéfield. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETREADONLY ΓöéSets the read-only state of an entryΓöé Γöé Γöéfield control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETSEL ΓöéSets the zero-based offsets of the Γöé Γöé Γöébounds of the text that forms the Γöé Γöé Γöécurrent selection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEM_SETTEXTLIMIT ΓöéSets the maximum number of bytes Γöé Γöé Γöéthat an entry field control can Γöé Γöé Γöécontain. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Message Generated by an Entry Field to its Owner Window ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéOccurs when the user presses a key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé Γöéconversion of DBCS characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe entry field control window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the entry field control Γöé Γöé Γöéwindow parameters. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 13. Multiple-Line Entry Field Controls ΓòÉΓòÉΓòÉ A multiple-line entry (MLE) field is a sophisticated control window that enables a user to view and edit multiple lines of text. This chapter describes how to create and use multiple-line entry field controls in a PM application. ΓòÉΓòÉΓòÉ 13.1. About Multiple-Line Entry Field Controls ΓòÉΓòÉΓòÉ An MLE field control gives an application the text-editing capabilities of a simple text editor. The application can create a multiple-line entry field by using the WinCreateWindow function or by specifying the MLE statement in a dialog-window template in a resource-definition file. ΓòÉΓòÉΓòÉ 13.1.1. MLE Styles ΓòÉΓòÉΓòÉ The style of an MLE field control determines how the MLE field appears and behaves. An application can specify a combination of the following styles for an MLE field: Multiple-Line Entry Field Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLS_BORDER ΓöéDraws a border around the MLE field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLS_HSCROLL ΓöéAdds a horizontal scroll bar to the MLE Γöé Γöé Γöéfield. The MLE control enables this scroll Γöé Γöé Γöébar whenever any line exceeds the width of Γöé Γöé Γöéthe MLE field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLS_IGNORETAB ΓöéDirects the MLE control to ignore the Tab Γöé Γöé Γöékey. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLS_READONLY ΓöéPrevents the MLE field from accepting text Γöé Γöé Γöéfrom the user. This style is useful for Γöé Γöé Γöédisplaying lengthy static text in a client orΓöé Γöé Γöédialog window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLS_VSCROLL ΓöéAdds a vertical scroll bar to the MLE field. Γöé Γöé ΓöéThe MLE control enables this scroll bar Γöé Γöé Γöéwhenever the number of lines exceeds the Γöé Γöé Γöéheight of the MLE field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLS_WORDWRAP ΓöéAutomatically breaks lines that are longer Γöé Γöé Γöéthan the width of the MLE field. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 13.1.2. MLE Control Notification Codes ΓòÉΓòÉΓòÉ An MLE field control sends WM_CONTROL messages containing notification codes to its owner whenever certain events occur-for example, when the user or application tries to insert too much text, or when the user uses the scroll bars. The owner window uses the notification codes either to carry out custom operations for the MLE field or to respond to errors. An MLE field control can send the following notification codes to its owner: Multiple-Line Entry Field Control Notification Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_CHANGE ΓöéIndicates that the contents of the Γöé Γöé ΓöéMLE field have changed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_CLPBDFAIL ΓöéIndicates that a clipboard operationΓöé Γöé Γöéfailed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_HSCROLL ΓöéIndicates that the MLE text is aboutΓöé Γöé Γöéto scroll horizontally. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_KILLFOCUS ΓöéIndicates that the MLE field lost Γöé Γöé Γöéthe input focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_MARGIN ΓöéIndicates that the mouse moved Γöé Γöé Γöéacross the MLE field margin. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_MEMERROR ΓöéIndicates that the MLE field controlΓöé Γöé Γöécannot allocate enough memory to Γöé Γöé Γöéperform the requested operation. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_OVERFLOW ΓöéIndicates that the specified MLE Γöé Γöé Γöéoperation would overflow the field'sΓöé Γöé Γöétext limit or the format rectangle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_PIXHORZOVERFLOW ΓöéIndicates that the user entered moreΓöé Γöé Γöétext than could fit horizontally in Γöé Γöé Γöéthe MLE field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_PIXVERTOVERFLOW ΓöéIndicates that the user entered moreΓöé Γöé Γöétext than could fit vertically in Γöé Γöé Γöéthe MLE field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_SEARCHPAUSE ΓöéIndicates that the MLE field controlΓöé Γöé Γöépaused during a search operation Γöé Γöé Γöéinitiated by an MLM_SEARCH message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_SETFOCUS ΓöéIndicates that the MLE field Γöé Γöé Γöéreceived the input focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_TEXTOVERFLOW ΓöéIndicates that the user or Γöé Γöé Γöéapplication attempted to exceed the Γöé Γöé Γöétext limit of the MLE field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_UNDOOVERFLOW ΓöéIndicates that the MLE field controlΓöé Γöé Γöécannot undo a text change because Γöé Γöé Γöéthe undo operation involves too muchΓöé Γöé Γöétext. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLN_VSCROLL ΓöéIndicates that the MLE text is aboutΓöé Γöé Γöéto scroll vertically. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ The MLE field control sends the MLN_HSCROLL or MLN_VSCROLL notification codes when the user enables the scroll bars so that the application can monitor the visible contents of the MLE field. The application also can monitor the contents of an MLE field by using the MLM_QUERYFIRSTCHAR message, which specifies the offset of the character in the upper-left corner of the MLE field. This represents the first MLE character that is visible to the user. To provide an alternative way of scrolling the contents of an MLE field, an application can move the character at the specified offset to the upper-left corner of an MLE field using the MLM_SETFIRSTCHAR message. The MLE field control sends an MLN_CHANGE notification code when the user changes the text in some way. This notification code is especially useful when the MLE field is in a dialog window, because the dialog procedure can use this code to determine whether it should process the contents of the MLE field. If an application does not process MLN_CHANGE notification codes, it can use the MLM_QUERYCHANGED message to determine whether the user has made changes to the MLE text. The MLM_SETCHANGED message makes the MLE field control send an MLN_CHANGE notification code with every event that occurs in the MLE field, regardless of whether the user has changed anything. This code also can be used to hide a change made by a user. ΓòÉΓòÉΓòÉ 13.1.3. MLE Text Editing ΓòÉΓòÉΓòÉ An MLE field contains one or more lines of text. Each line consists of one or more characters and ends with one or more characters that represent the end of the line. The end-of-line characters are determined by the format of the text. The user can type text in an MLE field when the MLE field has the focus. The application can insert text at any time by using the MLM_INSERT message and specifying the text as a null-terminated string. The MLE field control inserts the text at the cursor position or replaces the selected text. The MLE field control entry mode, insert or overstrike, determines what happens when the user inserts text. The user sets the entry mode by pressing the Insert key. The entry mode alternates each time the user presses Insert. When overstrike mode is enabled, at least one character is selected. This means that the MLM_INSERT message always replaces at least one character. If insert mode is enabled, the MLM_INSERT message replaces only those characters the user or application has selected. Otherwise, the MLE field makes room for the inserted characters by moving existing characters to the right, starting at the cursor position. The cursor position, identified by a blinking bar, is specified as a character offset relative to the beginning of the text. The user can set the cursor position by using the mouse or Arrow keys to move the blinking bar. An application can set the cursor position by using the MLM_SETSEL message, which directs the MLE field control to move the blinking bar to a given character position. The MLM_SETSEL message also can set the selection. The selection is one or more characters of text on which the MLE field control carries out an operation, such as deleting or copying. The user selects text by pressing the Shift key while moving the cursor or by pressing mouse button 1 while moving the mouse. The user also can select a word in a block of text by double-clicking on the word. An application selects text by using the MLM_SETSEL message to specify the cursor position and the anchor point. The selection is all the text between the cursor position and the anchor point. If the cursor position and anchor point are equal, there is no selection. An application can retrieve the cursor position, anchor point, or both, by using the MLM_QUERYSEL message. The user can delete characters, one at a time, by pressing the Delete key or the Backspace key. Pressing the Delete key deletes the character to the right of the cursor; pressing the Backspace key deletes the character to the left of the cursor and changes the cursor position. An application can delete one or more characters by using the MLM_DELETE message, which directs the MLE field control to delete a specified number of characters, starting at the given position. This message does not change the cursor position. An application can delete selected text by using the MLM_CLEAR message. An application can reverse the previous operation by using the MLM_UNDO message, which restores the MLE field to its previous state. This is a quick way to fix editing mistakes. However, not all operations can be undone. The application determines whether the previous operation can be undone by using the MLM_QUERYUNDO message, which returns TRUE and indicates the type of operation that can be undone. Using the MLM_RESETUNDO message, an application can prevent a subsequent MLM_UNDO message from changing the state of an MLE field. ΓòÉΓòÉΓòÉ 13.1.4. MLE Text Formatting ΓòÉΓòÉΓòÉ An application can retrieve the number of lines of text in an MLE field by using the MLM_QUERYLINECOUNT message and can retrieve the number of characters in the MLE field by using the MLM_QUERYTEXTLENGTH message. The amount of text and, subsequently, the number of lines to be entered in an MLE field depend on the text limit. An application sets the text limit by using the MLM_SETTEXTLIMIT message and determines the current limit by using the MLM_QUERYTEXTLIMIT message. The user cannot set the text limit. If the user types to the text limit, the MLE field control beeps and ignores any subsequent keystrokes. If the application attempts to add text beyond the limit, the MLE field control truncates the text. An application can control the length of each line in an MLE field by enabling word wrapping. When word wrapping is enabled, the MLE field control automatically breaks any line that is longer than the MLE field is wide. An application can set word wrapping by using the MLM_SETWRAP message, and it can determine whether the MLE field control is wrapping text by using the MLM_QUERYWRAP message. Word wrapping is disabled by default unless the application specifies the MLS_WORDWRAP style when creating the MLE field control. An application can set tab stops for an MLE control by using the MLM_SETTABSTOP message. Tab stops specify the maximum width of a tab character. When the user or an application inserts a tab character, the MLE field control expands the character so that it fills the space between the cursor position and the next tab stop. The MLM_SETTABSTOP message sets the distance (in pels) between tab stops, and the MLE field control provides as many tab stops as necessary, no matter how long the line gets. An application can retrieve the distance between tab stops using the MLM_QUERYTABSTOP message. An application can use the MLM_SETFORMATRECT message to set the format rectangle (MLE field). The format rectangle is used to set the horizontal and vertical limits for text. The MLE control sends a notification message to the parent window of the MLE field if text exceeds either of those limits. An application typically uses the format rectangle to provide its own word wrapping or other special text processing. An application can retrieve the current format rectangle by using the MLM_QUERYFORMATRECT message. An application can prevent the user's editing of the MLE field by setting the MLS_READONLY style in the WinCreateWindow function or in the MLE statement in the resource-definition file. The application also can set and query the read-only state by using the MLM_SETREADONLY and MLM_QUERYREADONLY messages, respectively. An application can set the colors and font for an MLE field by using the MLM_SETTEXTCOLOR, MLM_SETBACKCOLOR, and MLM_SETFONT messages. These messages affect all text in the MLE field. An MLE field cannot contain a mixture of fonts and colors. An application can retrieve the current values for the colors and font by using the MLM_QUERYTEXTCOLOR, MLM_QUERYBACKCOLOR, and MLM_QUERYFONT messages. ΓòÉΓòÉΓòÉ 13.1.5. MLE Text Import and Export Operations ΓòÉΓòÉΓòÉ An application can copy text to and from an MLE field by importing and exporting. To import text to an MLE field, an application can use the MLM_IMPORT message, which copies text from a buffer to the MLE field. To export text from an MLE field, the application can use the MLM_EXPORT message, which copies text from the MLE field to a buffer. The application uses the MLM_SETIMPORTEXPORT message to set the import and export buffers. An application can import and export text in a variety of formats. A text format, set with the MLM_FORMAT message, identifies which characters are used for the end-of-line characters. An MLE field can have the following text formats: Multiple-Line Entry Field Text Format ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFormat ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLFIE_CFTEXT ΓöéExported lines end with a carriage Γöé Γöé Γöéreturn/newline character pair (0x0D, 0x0A). Γöé Γöé ΓöéImported lines must end with a newline Γöé Γöé Γöécharacter, carriage return/newline character Γöé Γöé Γöépair, or newline/carriage return character Γöé Γöé Γöépair. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLFIE_NOTRANS ΓöéImported and exported lines end with a Γöé Γöé Γöénewline character (0x0A). Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLFIE_WINFMT ΓöéFor exported lines, the carriage Γöé Γöé Γöéreturn/newline character pair marks a hard Γöé Γöé Γöélinebreak (a break entered by the user). TwoΓöé Γöé Γöécarriage-return characters and a newline Γöé Γöé Γöécharacter (0x0D, 0x0D, 0x0A) mark a soft Γöé Γöé Γöélinebreak (a break inserted during word Γöé Γöé Γöéwrapping and not entered by the user). For Γöé Γöé Γöéimported lines, the extra carriage-return in Γöé Γöé Γöésoft linebreak characters is ignored. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ The text format can affect the number of characters in a selection. To ensure that the export buffer is large enough to hold exported text, an application can send the MLM_QUERYFORMATLINELENGTH message. The application can send the MLM_QUERYFORMATTEXTLENGTH message to determine the number of bytes in the text to be exported. Each time an application inserts text in an MLE field, the MLE field control automatically refreshes (repaints) the display by drawing the new text. When an application copies large amounts of text to an MLE field, refreshing can be quite time-consuming, so the application should disable the refresh state. The application disables the refresh state by sending the MLM_DISABLEREFRESH message. After copying all the text, the application can restore the refresh state by sending the MLM_ENABLEREFRESH message. ΓòÉΓòÉΓòÉ 13.1.6. MLE Field Control Cut, Copy, and Paste Operations ΓòÉΓòÉΓòÉ The user can cut, copy, and paste text in an MLE field by using the Ctrl+Delete, Shift+Delete, and Shift+Insert key combinations. An application-either by itself or in response to the user-can cut, copy, and paste text by using the MLM_CUT, MLM_COPY, and MLM_PASTE messages. The MLM_CUT and MLM_COPY messages copy the selected text to the clipboard. The MLM_CUT message also deletes the text from the MLE field; MLM_COPY does not. The MLM_PASTE message copies the text from the clipboard to the current position in the MLE field, replacing any existing text with the copied text. An application can delete the selected text without copying it to the clipboard by using the MLM_CLEAR message. An application also can copy the selected text from an MLE field to a buffer by using the MLM_QUERYSELTEXT message. This message does not affect the contents of the clipboard. ΓòÉΓòÉΓòÉ 13.1.7. MLE Field Control Search and Replace Operations ΓòÉΓòÉΓòÉ An application can search for a specified string within MLE field text by using the MLM_SEARCH message, which searches for the string. The MLE field control returns TRUE if the string is found. The cursor does not move to the string unless the message specifies the MLFSEARCH_SELECTMATCH option. An application also can use the MLM_SEARCH message to replace one string with another. If the message specifies the MLFSEARCH_CHANGEALL option, the MLE field control replaces all occurrences of the search string with the replacement string. Both the search string and the replacement string must be specified in an MLE_SEARCHDATA structure passed with the message. ΓòÉΓòÉΓòÉ 13.2. Using Multiple-Line Entry Field Controls ΓòÉΓòÉΓòÉ This section explains how to create an MLE field control by using the WinCreateWindow function and by specifying the MLE statement in a dialog template in a resource-definition file. ΓòÉΓòÉΓòÉ 13.2.1. Creating an MLE Field Control ΓòÉΓòÉΓòÉ The following code fragment shows how to create an MLE field control by using WinCreateWindow: *xcode. #define MLE_WINDOW_ID 2 HWND hwndParent; HWND hwndMLE; hwndMLE = WinCreateWindow( hwndParent, /* Parent window */ WC_MLE, /* Window class */ "Test", /* Initial text */ WS_VISIBLE | /* Window style */ MLS_BORDER, /* Window style */ 100, 100, /* x and y positions */ 100, 100, /* Width and height */ hwndParent, /* Owner window */ HWND_TOP, /* Top of z-order */ MLE_WINDOW_ID, /* Identifier */ NULL, /* Control data */ NULL); /* Pres. parameters */ It also is common to create an MLE field control by using an MLE statement in a dialog-window template in a resource file, as shown in the following code fragment: MLE "", IDD_MLETEXT, 110, 10, 50, 100, WS_VISIBLE | MLS_BORDER | MLS_WORDWRAP The predefined class for an MLE control is WC_MLE. If you do not specify a style for the MLE control, the default styles used are MLS_BORDER, WS_GROUP, and WS_TABSTOP. ΓòÉΓòÉΓòÉ 13.2.2. Importing and Exporting MLE Text ΓòÉΓòÉΓòÉ Importing and exporting MLE text takes place though a buffer. An import operation copies text from the buffer to the MLE field; an export operation copies text from the MLE to the buffer. Before an application can import or export MLE text, it must send an MLM_SETIMPORTEXPORT message to the MLE field control, specifying the address and size of the buffer. To import text, an application sends the MLM_IMPORT message to the MLE field control. This message requires two parameters: plOffset and cbCopy. The plOffset parameter is a pointer to a variable that specifies the position in the MLE field where the text from the buffer is to be placed. The position is an offset from the beginning of the MLE text (that is, the number of characters from the beginning of the MLE text). If plOffset points to a variable that equals -1, the MLE field control places the text starting at the current cursor position. On return, this variable contains the offset to the first character beyond the imported text. The cbCopy parameter of the MLM_IMPORT message points to a variable that specifies the number of bytes to import. The following code fragment reads text from a file to a buffer, then imports the text to an MLE field: HWND hwndMle; CHAR szMleBuf[512]; IPT lOffset = 0; PSZ pszTextFile; HFILE hf; ULONG cbCopied; ULONG ulAction; ULONG cbBytesRead; . . /* Obtain a file name from the user. */ . /* Open the file. */ DosOpen(pszTextFile, &hf, &ulAction, 0, FILE_NORMAL, FILE_OPEN | FILE_CREATE, OPEN_ACCESS_READONLY | OPEN_SHARE_DENYNONE, NULL); /* Zero-fill the buffer using memset, a C run-time function. */ memset(szMleBuf, 0, sizeof(szMleBuf)); /* Set the MLE import-export buffer. */ WinSendMsg(hwndMle, MLM_SETIMPORTEXPORT, MPFROMP(szMleBuf), MPFROMSHORT ((USHORT) sizeof(szMleBuf))); /* * Read the text from the file to the buffer, then import it * to the MLE. */ do { DosRead(hf, szMleBuf, sizeof(szMleBuf), &cbBytesRead); cbCopied = (ULONG) WinSendMsg(hwndMle, MLM_IMPORT, MPFROMP( &lOffset), MPFROMP(&cbBytesRead)); } while (cbCopied); /* Close the file. */ DosClose(hf); To export MLE text, an application sends the MLM_EXPORT message to the MLE control. Like MLM_IMPORT, the MLM_EXPORT message takes the plOffset and cbCopy parameters. The plOffset parameter is a pointer to a variable that specifies the offset to the first character to export. A value of -1 specifies the current cursor position. On return, the variable contains the offset to the first character in the MLE field not copied to the buffer. The cbCopy parameter is a pointer to a variable that specifies the number of bytes to export. On return, this variable equals 0 if the number of characters actually copied does not exceed the number specified to be copied. The following code fragment shows how to export text from an MLE field, then store the text in a file: HWND hwndMle; CHAR szMleBuf[512]; IPT lOffset = 0; PSZ pszTextFile; HFILE hf; ULONG cbCopied; ULONG ulAction; ULONG cbBytesWritten; ULONG cbCopy; /* Zero-fill the buffer using memset, a C run-time function. */ memset(szMleBuf, 0, sizeof(szMleBuf)); /* Set the MLE import-export buffer. */ WinSendMsg(hwndMle, MLM_SETIMPORTEXPORT, MPFROMP(szMleBuf), MPFROMSHORT ((USHORT) sizeof(szMleBuf))); . . /* Obtain a filename from the user. */ . /* Open the file. */ DosOpen(pszTextFile, &hf, &ulAction, 0, FILE_NORMAL, FILE_OPEN | FILE_CREATE, OPEN_ACCESS_WRITEONLY | OPEN_SHARE_DENYNONE, NULL); /* Find out how much text is in the MLE. */ cbCopy = (ULONG) WinSendMsg(hwndMle, MLM_QUERYFORMATTEXTLENGTH, MPFROMLONG(lOffset), MPFROMLONG((-1))); /* Copy the MLE text to the buffer. */ cbCopied = (ULONG) WinSendMsg(hwndMle, MLM_EXPORT, MPFROMP(&lOffset), MPFROMP(&cbCopy)); /* Write the contents of the buffer to the file. */ DosWrite(hf, szMleBuf, sizeof(szMleBuf), &cbBytesWritten); /* Close the file. */ DosClose(hf); ΓòÉΓòÉΓòÉ 13.2.3. Searching MLE Text ΓòÉΓòÉΓòÉ An application uses the MLM_SEARCH message and the MLE_SEARCHDATA structure to search for strings in MLE text. The first parameter of the MLM_SEARCH message is an array of flags that specify the style of the search. The application can set the MLFSEARCH_CASESENSITIVE flag if a case-sensitive search is required. If the application sets the MLFSEARCH_SELECTMATCH flag, the MLE field control highlights a matching string and, if necessary, scrolls the string into view. An application can use the MLFSEARCH_CHANGEALL flag to replace every occurrence of the string with the string specified in the pchReplace member of the MLE_SEARCHDATA structure. The second parameter of the MLM_SEARCH message is a pointer to an MLE_SEARCHDATA structure that contains information required to perform the search operation. This structure includes a pointer to the string and, if the MLFSEARCH_CHANGEALL flag is set in the MLM_SEARCH message, a pointer to the replacement string. The iptStart and iptStop members specify the starting and ending positions of the search. These positions are specified as offsets from the beginning of the MLE field. A value of -1 in the iptStart member causes the search to start at the current cursor position. A negative value in the iptStop member causes the search to end at the end of the MLE field. If a matching string is found, the MLE field control returns the length of the string in the cchFound member. The following code fragment uses an entry field to obtain a search string from the user, then searches an MLE field for an occurrence of the string. The search begins at the current cursor position and ends at the end of the MLE text. When the MLFSEARCH_SELECTMATCH flag is specified, the MLE field control highlights a matching string and scrolls it into view. #define IDD_SEARCHFIELD 101 HWND hwnd; HWND hwndEntryFld; HWND hwndMle; MLE_SEARCHDATA mlesrch; CHAR szSearchString[64]; /* * Obtain the handle of the entry field containing the * search string. */ hwndEntryFld = WinWindowFromID(hwnd, IDD_SEARCHFIELD); /* Obtain the search string from the entry field. */ WinQueryWindowText(hwndEntryFld, sizeof(szSearchString), szSearchString); /* Fill the MLE_SEARCHDATA structure. */ mlesrch.cb = sizeof(mlesrch); /* Structure size */ mlesrch.pchFind = szSearchString; /* Search string */ mlesrch.pchReplace = NULL; /* No replacement string */ mlesrch.cchFind = 0; /* Not used */ mlesrch.cchReplace = 0; /* Not used */ mlesrch.iptStart = -1; /* Start at cursor position */ mlesrch.iptStop = -1; /* Stop at end of file */ /* Start the search operation. */ WinSendMsg(hwndMle, MLM_SEARCH, MPFROMLONG(MLFSEARCH_SELECTMATCH), MPFROMP(&mlesrch)); ΓòÉΓòÉΓòÉ 13.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 structures and messages used with multiple-line entry field controls. Multiple-Line Entry Field Control Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLECTLDATA ΓöéMultiple-line entry field control Γöé Γöé Γöédata structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLEMARGSTRUCT ΓöéMultiple-line entry field margin Γöé Γöé Γöéinformation Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLEOVERFLOW ΓöéMultiple-line entry field overflow Γöé Γöé Γöéerror structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLE_SEARCHDATA ΓöéMultiple-line entry field search Γöé Γöé Γöéstructure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Received by an MLE Field Control ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_CHARFROMLINE ΓöéReturns the first insertion Γöé Γöé Γöépoint on a given line. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_CLEAR ΓöéClears the current selection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_COPY ΓöéCopies the current selection Γöé Γöé Γöéto the clipboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_CUT ΓöéCopies the text that forms theΓöé Γöé Γöécurrent selection to the Γöé Γöé Γöéclipboard, then deletes the Γöé Γöé Γöétext from the MLE field Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_DELETE ΓöéDeletes text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_DISABLEREFRESH ΓöéDisables screen refresh. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_ENABLEREFRESH ΓöéEnables screen refresh. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_EXPORT ΓöéExports text to a buffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_FORMAT ΓöéSets the format to be used forΓöé Γöé Γöébuffer importing and Γöé Γöé Γöéexporting. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_IMPORT ΓöéImports text from a buffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_INSERT ΓöéDeletes the current selection Γöé Γöé Γöéand replaces it with a text Γöé Γöé Γöéstring. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_LINEFROMCHAR ΓöéReturns the line number Γöé Γöé Γöécorresponding to a given Γöé Γöé Γöéinsertion point. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_PASTE ΓöéReplaces the text that forms Γöé Γöé Γöéthe current selection with Γöé Γöé Γöétext from the clipboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYBACKCOLOR ΓöéQueries the background color. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYCHANGED ΓöéQueries the changed flag. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYFIRSTCHAR ΓöéQueries the first visible Γöé Γöé Γöécharacter. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYFONT ΓöéQueries which font is in use. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYFORMATLINELENGTH ΓöéReturns the number of bytes toΓöé Γöé Γöéend of line after formatting Γöé Γöé Γöéis applied. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYFORMATRECT ΓöéQueries the format dimensions Γöé Γöé Γöéand mode. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYFORMATTEXTLENGTH ΓöéReturns the length of a Γöé Γöé Γöéspecified range of characters Γöé Γöé Γöéafter the current formatting Γöé Γöé Γöéis applied. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYIMPORTEXPORT ΓöéQueries the current transfer Γöé Γöé Γöébuffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYLINECOUNT ΓöéQueries the number of lines ofΓöé Γöé Γöétext. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYLINELENGTH ΓöéReturns the number of bytes Γöé Γöé Γöébetween a given insertion Γöé Γöé Γöépoint and the end of line. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYREADONLY ΓöéQueries the read-only mode. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYSEL ΓöéReturns the location of the Γöé Γöé Γöéselection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYSELTEXT ΓöéCopies the currently selected Γöé Γöé Γöétext into a buffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYTABSTOP ΓöéQueries the pel interval at Γöé Γöé Γöéwhich tab stops are placed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYTEXTCOLOR ΓöéQueries the text color. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYTEXTLENGTH ΓöéReturns the number of Γöé Γöé Γöécharacters in the text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYTEXTLIMIT ΓöéQueries the maximum number of Γöé Γöé Γöébytes that a multiple-line Γöé Γöé Γöéentry field control can Γöé Γöé Γöécontain. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYUNDO ΓöéQueries the possible undo or Γöé Γöé Γöéredo operations. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_QUERYWRAP ΓöéQueries the wrap flag. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_RESETUNDO ΓöéResets the undo state to Γöé Γöé Γöéindicate the no undo Γöé Γöé Γöéoperations are possible. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SEARCH ΓöéSearches for a specified text Γöé Γöé Γöéstring. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETBACKCOLOR ΓöéSets the background color. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETCHANGED ΓöéSets or clears the changed Γöé Γöé Γöéflag. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETFIRSTCHAR ΓöéSets the first visible Γöé Γöé Γöécharacter. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETFONT ΓöéSets a font. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETFORMATRECT ΓöéSets the format dimensions andΓöé Γöé Γöémode. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETIMPORTEXPORT ΓöéSets the current transfer Γöé Γöé Γöébuffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETREADONLY ΓöéSets or clears read-only mode.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETSEL ΓöéSets a selection. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETABSTOP ΓöéSets the pel interval at whichΓöé Γöé Γöétab stops are placed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETTEXTCOLOR ΓöéSets the text color. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETTEXTLIMIT ΓöéSets the maximum number of Γöé Γöé Γöébytes that a multiple-line Γöé Γöé Γöéentry field control can Γöé Γöé Γöécontain. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_SETWRAP ΓöéSets the wrap flag. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMLM_UNDO ΓöéPerforms any available undo Γöé Γöé Γöéoperations. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Issued by an MLE Field Control to Its Owner Window ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 1 twice within a specified Γöé Γöé Γöétime. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1UP ΓöéOccurs when the user releases Γöé Γöé Γöépointer button 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéSent when the user presses a key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when an MLE field control hasΓöé Γöé Γöéa significant event to notify to itsΓöé Γöé Γöéowner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéSets the state of the MLE field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéOccurs when the pointing device Γöé Γöé Γöépointer moves. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe entry field control window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the entry field control Γöé Γöé Γöéwindow parameters. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 14. Scroll-Bar Controls ΓòÉΓòÉΓòÉ Scroll bars are control windows that convert mouse and keyboard input into integers; they are used by an application to scroll the contents of a client window. This chapter describes how to create and use scroll bars in PM applications. ΓòÉΓòÉΓòÉ 14.1. About Scroll Bars ΓòÉΓòÉΓòÉ A scroll bar has three main parts: the bar, its arrows, and a slider (see the following figure). Scroll Bars in a Window The arrows are located at each end of the scroll bar. The left scroll arrow, on the left side of a horizontal scroll bar, enables the user to scroll to the left in a document. The right scroll arrow lets the user scroll to the right. On a vertical scroll bar, the upper scroll arrow enables the user to scroll upward in the document; the lower scroll arrow, downward. The slider, which lies between the two scroll arrows, reflects the current value of the scroll bar. Scroll bars monitor the slider and send notification messages to the owner window when the slider position changes as a result of mouse or keyboard input. Although, typically, scroll bars are used in frame windows, an application can use stand-alone scroll bars of any size or shape, at any position, in a window of almost any class. Scroll bars can be used as parts of other control windows; for example, a list box uses a scroll bar to enable the user to view items when the list box is too small to display all the items. ΓòÉΓòÉΓòÉ 14.1.1. Scroll-Bar Creation ΓòÉΓòÉΓòÉ An application can include a scroll bar in a standard frame window by specifying the FCF_HORZSCROLL or FCF_VERTSCROLL flag in the WinCreateStdWindow function. To create a scroll bar in another type of window, an application can specify the predefined (preregistered) window class WC_SCROLLBAR in the WinCreateWindow function or in the CONTROL statement in a resource file. Although most applications specify an owner window when creating a scroll bar, an owner is not required. If an application does not specify an owner, the scroll bar does not send notification messages. ΓòÉΓòÉΓòÉ 14.1.1.1. Scroll-Bar Styles ΓòÉΓòÉΓòÉ A scroll bar has styles that determine what it looks like and how it responds to input. Styles are specified in the WinCreateWindow function or the CONTROL statement. A scroll-bar can have the following styles: Scroll-Bar Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle ΓöéMeaning Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBS_AUTOTRACK ΓöéCauses the entire slider to track the Γöé Γöé Γöémovement of the mouse pointer when the user Γöé Γöé Γöéscrolls the window. Without this style, only Γöé Γöé Γöéan outlined image of the slider tracks the Γöé Γöé Γöémovement of the mouse pointer, and the sliderΓöé Γöé Γöéjumps to the new location when the user Γöé Γöé Γöéreleases the mouse button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBS_HORZ ΓöéCreates a horizontal scroll bar. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBS_THUMBSIZE ΓöéCauses the SBCDATA structure to store Γöé Γöé Γöéinformation used to calculate the size of theΓöé Γöé Γöéscroll-bar slider. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBS_VERT ΓöéCreates a vertical scroll bar. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 14.1.1.2. Scroll-Bar Range and Position ΓòÉΓòÉΓòÉ Every scroll bar has a range and a slider position. The range specifies the minimum and maximum values for the slider position. As the user moves the slider in a scroll bar, the scroll bar reports the slider position as an integer in this range. If the slider position is the minimum value, the slider is at the top of a vertical scroll bar or at the left end of a horizontal scroll bar. If the slider position is the maximum value, the slider is at the bottom or right end of the vertical or horizontal scroll bar, respectively. An application can adjust the range to convenient integers by using the SBM_SETSCROLLBAR message (or initially, by using the SBCDATA structure). This makes it easy to translate the slider position into a value that corresponds to the data being scrolled. For example, an application attempting to display 100 lines of text in a window that can show only 20 lines at a time could set the vertical scroll-bar range from 1 through 100. If the slider were at position 0, the first line would be at the top of the window. If the slider were at position 100, the last line would be at the bottom of the window. To establish a useful relationship between the scroll-bar range and the data, an application must adjust the range whenever the data or the size of the window changes. This means the application should adjust the range as part of processing WM_SIZE messages. An application must move the slider in a scroll bar. Although the user requests scrolling in a scroll bar, the scroll bar does not update the slider position. Instead, it passes the request to the owner window, which scrolls the data and updates the slider position using the SBM_SETPOS message. The application controls the slider movement and can move the slider in the increments best suited for the data being scrolled. An application can retrieve the current slider position of a scroll bar by sending the SBM_QUERYPOS message to the scroll bar. If a scroll bar is a descendant of a frame window, its position relative to its parent can change when the position of the frame window changes. Frame windows draw scroll bars relative to the upper-left corner of the frame window (rather than the lower-left corner). The frame window can adjust the y coordinate of the scroll-bar position, which would be desirable if the scroll bar is a child of the frame window, but would be undesirable if the scroll bar is not a child window. ΓòÉΓòÉΓòÉ 14.1.2. Scroll-Bar Notification Messages ΓòÉΓòÉΓòÉ A scroll bar sends notification messages to its window whenever the user clicks the scroll bar. WM_VSCROLL and WM_HSCROLL are the notification messages for vertical and horizontal scroll bars, respectively. If the scroll bar is a frame control window, the frame window passes the message to its client window. Each notification message includes the scroll-bar identifier, scroll-bar command code corresponding to the action of the user, and, in some cases, the position of the slider. If an application creates a scroll bar as part of a frame control window, the scroll-bar identifier is the predefined constant FID_VERTSCROLL or FID_HORZSCROLL. Otherwise, it is the identifier given in the WinCreateWindow function. The scroll-bar command codes specify the action the user has taken. Operating system user-interface guidelines recommend certain responses for each action. The following figure illustrates the SBM_xxx messages your application can send to a scroll bar. Standard Window Scroll Bar and Command Codes Following is a list of the command codes; for each code, the user action is specified, followed by the application's response. In each case, a scrolling unit, appropriate for the given data, must be defined by the application. For example, for scrolling text vertically, the typical unit is a line. Scroll-Bar Command Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCommand Code ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_LINEUP ΓöéIndicates that the user clicked the Γöé Γöé Γöétop scroll arrow. Decrement the Γöé Γöé Γöéslider position by one, and scroll Γöé Γöé Γöétoward the top of the data by one Γöé Γöé Γöéunit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_LINEDOWN ΓöéIndicates that the user clicked the Γöé Γöé Γöébottom scroll arrow. Increment the Γöé Γöé Γöéslider position by one, and scroll Γöé Γöé Γöétoward the bottom of the data by oneΓöé Γöé Γöéunit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_LINELEFT ΓöéIndicates that the user clicked the Γöé Γöé Γöéleft scroll arrow. Decrement the Γöé Γöé Γöéslider position by one, and scroll Γöé Γöé Γöétoward the left end of the data by Γöé Γöé Γöéone unit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_LINERIGHT ΓöéIndicates that the user clicked the Γöé Γöé Γöéright scroll arrow. Increment the Γöé Γöé Γöéslider position by one, and scroll Γöé Γöé Γöétoward the right end of the data by Γöé Γöé Γöéone unit. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_PAGEUP ΓöéIndicates that the user clicked the Γöé Γöé Γöéscroll-bar background above the Γöé Γöé Γöéslider. Decrement the slider Γöé Γöé Γöéposition by the number of data unitsΓöé Γöé Γöéin the window, and scroll toward theΓöé Γöé Γöétop of the data by the same number Γöé Γöé Γöéof units. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_PAGEDOWN ΓöéIndicates that the user clicked the Γöé Γöé Γöéscroll-bar background below the Γöé Γöé Γöéslider. Increment the slider Γöé Γöé Γöéposition by the number of data unitsΓöé Γöé Γöéin the window, and scroll toward theΓöé Γöé Γöébottom of the data by the same Γöé Γöé Γöénumber of units. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_PAGELEFT ΓöéIndicates that the user clicked the Γöé Γöé Γöéscroll-bar background to the left ofΓöé Γöé Γöéthe slider. Decrement the slider Γöé Γöé Γöéposition by the number of data unitsΓöé Γöé Γöéin the window, and scroll toward theΓöé Γöé Γöéleft end of the data by the same Γöé Γöé Γöénumber of units. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_PAGERIGHT ΓöéIndicates that the user clicked the Γöé Γöé Γöéscroll-bar background to the right Γöé Γöé Γöéof the slider. Increment the slider Γöé Γöé Γöéposition by the number of data unitsΓöé Γöé Γöéin the window, and scroll toward theΓöé Γöé Γöéright end of the data by the same Γöé Γöé Γöénumber of units. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_SLIDERTRACK ΓöéIndicates that the user is dragging Γöé Γöé Γöéthe slider. Applications that draw Γöé Γöé Γöédata quickly can set the slider to Γöé Γöé Γöéthe position given in the message, Γöé Γöé Γöéand scroll the data by the same Γöé Γöé Γöénumber of units the slider has Γöé Γöé Γöémoved. Applications that cannot drawΓöé Γöé Γöédata quickly should wait for the Γöé Γöé ΓöéSB_SLIDERPOSITION code before movingΓöé Γöé Γöéthe slider and scrolling the data. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_SLIDERPOSITION ΓöéIndicates that the user released theΓöé Γöé Γöéslider after dragging it. Set the Γöé Γöé Γöéslider to the position given in the Γöé Γöé Γöémessage, and scroll the data by the Γöé Γöé Γöésame number of units the slider was Γöé Γöé Γöémoved. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSB_ENDSCROLL ΓöéIndicates that the user released theΓöé Γöé Γöémouse after holding it on an arrow Γöé Γöé Γöéor in the scroll-bar background. No Γöé Γöé Γöéresponse is necessary. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ If the command code is SB_SLIDERTRACK or SB_SLIDERPOSITION, indicating that the user is moving the scroll-bar slider, the notification message also contains the current position of the slider. The owner window can send a message to the scroll bar to read or reset the current value and range of the scroll bar. To reflect any changes in the state of the scroll bar, the owner window also can adjust the data the scroll bar controls. An application can use the WinEnableWindow function to disable a scroll bar. A disabled scroll bar ignores the actions of the user, sending out no notification messages when the user tries to manipulate it. If an application has no data to scroll, or if all data fits in the client window, the application should disable the scroll bar. ΓòÉΓòÉΓòÉ 14.1.3. Scroll Bars and the Keyboard ΓòÉΓòÉΓòÉ When a scroll bar has the keyboard focus, it generates notification messages for the following keys: Scroll-bar Notification Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéKeys ΓöéResponse Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéUP ΓöéSB_LINEUP or SB_LINELEFT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLEFT ΓöéSB_LINEUP or SB_LINELEFT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDOWN ΓöéSB_LINEDOWN or SB_LINERIGHT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRIGHT ΓöéSB_LINEDOWN or SB_LINERIGHT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéPGUP ΓöéSB_PAGEUP or SB_PAGELEFT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéPGDN ΓöéSB_PAGEDOWN or SB_PAGERIGHT Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ If an application uses scroll bars to scroll data but does not give the scroll bar the input focus, the window with the focus must process keyboard input. The window can generate scroll-bar notification messages or carry out the indicated scrolling. The following table shows the responses to keys that a window must process: Focus Window Message Responses to Keys ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéKey ΓöéResponse Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéUP ΓöéSB_LINEUP Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDOWN ΓöéSB_LINEDOWN Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéPGUP ΓöéSB_PAGEUP Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéPGDN ΓöéSB_PAGEDOWN Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCTRL+HOME ΓöéSB_SLIDERTRACK, with the slider set Γöé Γöé Γöéto the minimum position Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCTRL+END ΓöéSB_SLIDERTRACK, with the slider set Γöé Γöé Γöéto the maximum position Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLEFT ΓöéSB_LINELEFT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRIGHT ΓöéSB_LINERIGHT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCTRL+PGUP ΓöéSB_PAGELEFT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCTRL+PGDN ΓöéSB_PAGERIGHT Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéHOME ΓöéSB_SLIDERTRACK, with the slider set Γöé Γöé Γöéto the minimum position Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEND ΓöéSB_SLIDERTRACK, with the slider set Γöé Γöé Γöéto the maximum position Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ For vertical scroll bars that are part of list boxes, the following table shows the responses to keys: List Box Responses to Keys ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéKey ΓöéCommand Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCTRL+UP ΓöéSB_SLIDERTRACK, with the Γöé Γöé Γöéslider set to the minimum Γöé Γöé Γöéposition Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCTRL+DOWN ΓöéSB_SLIDERTRACK, with the Γöé Γöé Γöéslider set to the maximum Γöé Γöé Γöéposition Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéF7 ΓöéSB_PAGEUP Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéF8 ΓöéSB_PAGEDOWN Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 14.2. Using Scroll Bars ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Create scroll bars. o Retrieve a scroll-bar handle. o Initialize, adjust, and read the scroll-bar range and position. ΓòÉΓòÉΓòÉ 14.2.1. Creating Scroll Bars ΓòÉΓòÉΓòÉ When creating a frame window, you can add scroll bars by specifying the FCF_HORZSCROLL flag, FCF_VERTSCROLL flag, or both flags in the WinCreateStdWindow function. This adds horizontal, vertical, or both (as specified) scroll bars to the frame window. The frame window owns the scroll bars and passes notification messages from the scroll bars to the client window. The following code fragment adds scroll bars to a frame window: /* Set flags for a main window with scroll bars. */ ULONG ulFrameControlFlags = FCF_STANDARD | FCF_HORZSCROLL | FCF_VERTSCROLL; /* Create the window. */ hwndFrame = WinCreateStdWindow(HWND_DESKTOP, WS_VISIBLE, &ulFrameControlFlags, szClientClass, szFrameTitle, 0, (HMODULE) NULL, 0, &hwndClient); Scroll bars created this way have the window identifier FID_HORZSCROLL or FID_VERTSCROLL. To determine the size and position of the scroll bars, the frame window uses the standard size specified by the system values SV_CXVSCROLL and SV_CYHSCROLL. The position always is defined by the right and bottom edges of the frame window. Another way to create scroll bars is using the WinCreateWindow function. This method is most commonly used for stand-alone scroll bars. Creating scroll bars this way lets you set the size and position of the scroll bars. You also can specify which window should receive notification messages. The following code fragment creates a stand-alone scroll bar: #define ID_SCROLL_BAR 1 HWND hwndScroll,hwndClient; hwndScroll = WinCreateWindow( hwndClient, /* Scroll-bar parent window */ WC_SCROLLBAR, /* Preregistered scroll-bar class */ (PSZ) NULL, /* No window title */ SBS_VERT | WS_VISIBLE, /* Vertical style and visible */ 10, 10, /* Position & Size */ 20, 100, /* Size */ hwndClient, /* Owner */ HWND_TOP, /* Z-order position */ ID_SCROLL_BAR, /* Scroll-bar identifier */ NULL, /* No class-specific data */ NULL); /* No presentation parameters */ ΓòÉΓòÉΓòÉ 14.2.2. Retrieving a Scroll-Bar Handle ΓòÉΓòÉΓòÉ If you use the WinCreateStdWindow function to create a scroll bar as a child of the frame window, you must be able to retrieve the scroll-bar handle. One way to do this is to use the WinWindowFromID function, the frame-window handle, and a predefined identifier (such as FID_HORZSCROLL or FID_VERTSCROLL), as shown in the following code fragment: HWND hwndFrame,hwndHorzScroll,hwndVertScroll; hwndHorzScroll = WinWindowFromID(hwndFrame, FID_HORZSCROLL); hwndVertScroll = WinWindowFromID(hwndFrame, FID_VERTSCROLL); If the standard frame window includes a client window, you can use that handle to access the scroll bars. The idea is to get the frame-window handle first; then, the scroll-bar handle. HWND hwndScroll,hwndClient; /* Get a handle to the horizontal scroll bar. */ hwndScroll = WinWindowFromID( WinQueryWindow(hwndClient, QW_PARENT), FID_HORZSCROLL); ΓòÉΓòÉΓòÉ 14.2.3. Using the Scroll-Bar Range and Position ΓòÉΓòÉΓòÉ You can initialize the current value and range of a scroll bar to non-default values by sending the SBCDATA structure with class-specific data for a call to WinCreateWindow: #define ID_SCROLL_BAR 1 SBCDATA sbcd; HWND hwndScroll,hwndClient; /* Set up scroll-bar control data. */ sbcd.posFirst = 200; sbcd.posLast = 400; sbcd.posThumb = 300; /* Create the scroll bar. */ hwndScroll = WinCreateWindow(hwndClient, WC_SCROLLBAR, (PSZ) NULL, SBS_VERT | WS_VISIBLE, 10, 10, 20, 100, hwndClient, HWND_TOP, ID_SCROLL_BAR, &sbcd, /* Class-specific data */ NULL); You can adjust a scroll-bar value and range by sending it an SBM_SETSCROLLBAR message: /* Set the scroll-bar value and range. */ WinSendMsg(hwndScroll, SBM_SETSCROLLBAR, (MPARAM)300, MPFROM2SHORT(200, 400)); You can read a scroll-bar value by sending it an SBM_QUERYPOS message: USHORT usSliderPos; /* Read the scroll-bar value. */ usSliderPos = (USHORT) WinSendMsg(hwndScroll, SBM_QUERYPOS, (MPARAM) NULL, (MPARAM) NULL); Similarly, you can set a scroll-bar value by sending an SBM_SETPOS message: /* Set the vertical scroll-bar value. */ WinSendMsg(hwndScroll, SBM_SETPOS, (MPARAM)300, (MPARAM) NULL); You can read a scroll-bar range by sending it an SBM_QUERYRANGE message: MRESULT mr; USHORT usMinimum, usMaximum; /* Read the vertical scroll-bar range. */ mr = WinSendMsg(hwndScroll, SBM_QUERYRANGE, (MPARAM) NULL, (MPARAM) NULL); usMinimum = SHORT1FROMMR(mr); /* minimum in the low word */ usMaximum = SHORT2FROMMR(mr); /* maximum in the high word */ ΓòÉΓòÉΓòÉ 14.3. Summary ΓòÉΓòÉΓòÉ Following are the operating system structure and messages used with scroll bars. Scroll-Bar Structure ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBCDATA ΓöéScroll-bar control data structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Sent to a Scroll Bar ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBM_QUERYPOS ΓöéReturns the slider position. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBM_QUERYRANGE ΓöéReturns the scroll bar range. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBM_SETPOS ΓöéSets the position of the slider. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBM_SETSCROLLBAR ΓöéSets the scroll-bar range and sliderΓöé Γöé Γöépositions. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSBM_SETTHUMBSIZE ΓöéSets the scroll bar slider size. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Messages Sent from a Scroll Bar to Its Owner Window ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HSCROLL ΓöéOccurs when a horizontal scroll bar Γöé Γöé Γöécontrol has a significant event to Γöé Γöé Γöénotify to its owner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé Γöéconversion of DBCS characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe scroll bar control window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the scroll bar control Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_VSCROLL ΓöéOccurs when a vertical scroll bar Γöé Γöé Γöécontrol has a significant event to Γöé Γöé Γöénotify to its owner. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 15. Spin Button Controls ΓòÉΓòÉΓòÉ A spin button control (WC_SPINBUTTON window class) is a visual component that gives users quick access to a finite set of data by letting them select from a scrollable ring of choices. Since the user can see only one item at a time, a spin button should be used only with data that is intuitively related, such as a list of the months of the year, or an alphabetic list of cities or states. This chapter explains when and how to use spin buttons in PM applications. ΓòÉΓòÉΓòÉ 15.1. About Spin Buttons ΓòÉΓòÉΓòÉ A spin button consists of at least one spin field that is a single-line entry (SLE) field, and up and down arrows that are stacked on top of one another. These arrows are positioned to the right of the SLE field. The following figure shows an example. Example of a Spin Button You can create multi-field spin buttons for those applications in which users must select more than one value. For example, in setting a date, the spin button control can provide individual fields for setting the month, day, and year. The first spin field in the spin button could contain a list of months; the second, a list of numbers; and the third, a list of years. The application uses a multi-field spin button by creating one master component that contains a spin field and the spin arrows, and servant components that contain only spin fields. The spin buttons are created at component initialization. The servant components are passed a handle to the master component in a message. When a servant spin field has the focus, it is spun by the arrows in the master component. The list of values in a spin button entry field can be an array of data or a list of consecutive integers, defined by an upper and a lower limit. ΓòÉΓòÉΓòÉ 15.2. Creating a Spin Button ΓòÉΓòÉΓòÉ A spin button is created as a public window class by using the WinCreateWindow function, with a class style of WC_SPINBUTTON and a window style of WS_VISIBLE. These are joined with any of the spin button style flags by using a logical OR (|). The spin button style flags let you specify: o Character input restrictions (none, numeric, read-only) o Presentation of the data in the spin field (left-justified, right-justified, centered) o Presence or absence of a border around the spin field o Spin speed o Zero-padding of numeric spin fields. The placement and width of the spin button component are specified as parameters in the WinCreateWindow function. The upper and lower limits of numeric fields, the value array pointer for arrays of strings, and the initial value in the spin field are all set by messages sent from the application to the component. You can destroy the spin button component window using the WinDestroyWindow function when finished. The component handle that was returned when the spin button was created is the input parameter to the WinDestroyWindow function. The following figure is an example of how to create a spin button. Sample Code for Creating a Spin Button ULONG ulSpinStyle; /* Spin Button style */ HWND hwndSpin; /* Spin Button window handle */ /**********************************************************************/ /* Set the SPBS_* style flags. */ /**********************************************************************/ ulSpinStyle = SPBS_MASTER | /* Spinbtn has its own buttons, */ SPBS_NUMERICONLY | /* .. and it only holds numbers */ SPBS_JUSTRIGHT | /* .. that are right justified, */ SPBS_FASTSPIN; /* .. and it spins faster as */ /* the arrows are held down */ /**********************************************************************/ /* Create the Spin Button control window. The handle of the window */ /* is returned in hwndSpin. */ /**********************************************************************/ hwndSpin = WinCreateWindow ( hwndClient, /* Parent window handle */ WC_SPINBUTTON, /* Spin Button window class name */ (PSZ)NULL, /* No window text */ ulSpinStyle, /* Spin Button styles variable */ (LONG)10, /* X coordinate */ (LONG)10, /* Y coordinate */ (LONG)150, /* Window width */ (LONG)50, /* Window height */ hwndClient, /* Owner window handle */ HWND_TOP, /* Sibling window handle */ ID_SPINBUTTON, /* Spin Button control window ID */ (PVOID)NULL /* No control data structure */ (PVOID)NULL); /* No presentation parameters */ /**********************************************************************/ /* Set the limits of the Spin Button control, since it has a style */ /* of SPBS_NUMERICONLY. */ /**********************************************************************/ WinSendMsg (hwndSpin, /* Spin Button window handle */ SPBM_SETLIMITS, /* Set limits message */ (MPARAM)1000, /* Spin Button maximum setting */ (MPARAM)0); /* Spin Button minimum setting */ /**********************************************************************/ /* Set the initial value of the Spin Button. */ /**********************************************************************/ WinSendMsg (hwndSpin, /* Spin Button window handle */ SPBM_SETCURRENTVALUE, /* Set current value message. */ (MPARAM)100, /* Spin Button initial value */ (MPARAM)NULL); /* Reserved value */ /**********************************************************************/ /* Because all items have been set, make the control visible. */ /**********************************************************************/ WinShowWindow (hwndSpin, /* Spin Button window handle */ TRUE); /* Make the window visible. */ ΓòÉΓòÉΓòÉ 15.3. Graphical User Interface Support for Spin Buttons ΓòÉΓòÉΓòÉ Users can interact with the spin button using either the keyboard or a pointing device, such as a mouse, as follows: o Using the select button (button 1) on the pointing device, users first give focus to the spin field they want to change, and then click on either the Up Arrow or Down Arrow until the value they want is displayed in the spin field. o Using a keyboard, users press the: - Up Arrow and Down Arrow keys to see the choices - Left Arrow and Right Arrow keys to move the cursor left and right within a spin field - Home and End keys to move the cursor to the first and last characters in a spin field - Tab and Back Tab (Shift+Tab) keys to move the input focus from one field to another in multi-field spin buttons. Users can view the values in a spin field one at a time, or they can rapidly scroll a list by keeping either the Up or Down Arrow keys pressed. When a spin button is not read-only, users can advance quickly to the value they want to set in a spin field by typing over the value currently displayed. ΓòÉΓòÉΓòÉ 15.4. Summary ΓòÉΓòÉΓòÉ Following are tables that describe the OS/2 spin button control notification codes, notification message, and window messages: Spin Button Control Notification Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBN_CHANGE ΓöéSent when the contents of the spin Γöé Γöé Γöéfield change. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBN_DOWNARROW ΓöéSent when the Down Arrow button is Γöé Γöé Γöéclicked on or the Down Arrow key is Γöé Γöé Γöépressed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBN_ENDSPIN ΓöéSent when the user releases the Γöé Γöé Γöéselect button or one of the arrow Γöé Γöé Γöékeys while spinning a button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBN_KILLFOCUS ΓöéSent when the spin field loses the Γöé Γöé Γöéfocus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBN_SETFOCUS ΓöéSent when the spin field is Γöé Γöé Γöéselected. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBN_UPARROW ΓöéSent when the Up Arrow button is Γöé Γöé Γöéclicked on or the Up Arrow key is Γöé Γöé Γöépressed. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Spin Button Control Notification Message ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when the spin button control has a Γöé Γöé Γöésignificant event to notify to its owner. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Spin Button Control Window Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_OVERRIDESETLIMITS ΓöéCauses the component to set orΓöé Γöé Γöéreset numeric limits. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_QUERYLIMITS ΓöéEnables an application to Γöé Γöé Γöéquery the limits of a numeric Γöé Γöé Γöéspin field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_QUERYVALUE ΓöéCauses the component to show Γöé Γöé Γöéthe value in the spin field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_SETARRAY ΓöéCauses the component to set orΓöé Γöé Γöéreset the array of data. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_SETCURRENTVALUE ΓöéCauses the component to set orΓöé Γöé Γöéreset the current numeric Γöé Γöé Γöévalue or array index. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_SETLIMITS ΓöéCauses the component to set orΓöé Γöé Γöéreset numeric limits. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_SETMASTER ΓöéCauses the component to Γöé Γöé Γöéidentify its master. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_SETTEXTLIMIT ΓöéSets the maximum number of Γöé Γöé Γöécharacters allowed in a spin Γöé Γöé Γöéfield. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_SPINDOWN ΓöéCauses the component to show Γöé Γöé Γöéthe previous value (spin Γöé Γöé Γöébackward). Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSPBM_SPINUP ΓöéCauses the component to show Γöé Γöé Γöéthe next value (spin forward).Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 16. Static Controls ΓòÉΓòÉΓòÉ A static control is a simple text field, bit map, or icon that an application can use to label, enclose, or separate other control windows. This chapter describes how to create and use static controls in a PM application. ΓòÉΓòÉΓòÉ 16.1. About Static Controls ΓòÉΓòÉΓòÉ Unlike the other types of control windows, a static control does not accept user input nor send notification messages to its owner. The primary advantage of a static control is that it provides a label or graphic that requires little attention from an application. At most, an application might change the text or position of a static control. ΓòÉΓòÉΓòÉ 16.1.1. Keyboard Focus ΓòÉΓòÉΓòÉ A static control never accepts the keyboard focus. When a static control receives a WM_SETFOCUS message, or when a user clicks the static control, the system advances the focus to the next sibling window that is not a static control. If the control has no siblings, the system gives the focus to the owner of the static control. ΓòÉΓòÉΓòÉ 16.1.2. Static-Control Handle ΓòÉΓòÉΓòÉ Every static control is associated with a 32-bit data field. A static control with the SS_BITMAP or SS_ICON style uses this field to store the handle of the bit map or icon that it displays. An application can obtain that handle by sending the SM_QUERYHANDLE message to the control. An application can replace the bit map or icon by sending the SM_SETHANDLE message to the control, specifying a valid icon or bit map handle. Changing the handle causes the system to redraw the control. For a non-icon or non-bit map static control, the data field is available for application-defined data and has no effect on the appearance of the control. An application can retrieve the data field of a static-control window by calling WinWindowFromID, using the handle of the owner and the window identifier of the static control. The static-control window identifier is specified in either the dialog-window template or the WinCreateWindow function. ΓòÉΓòÉΓòÉ 16.1.3. Static-Control Styles ΓòÉΓòÉΓòÉ A static control has style bits that determine whether the control displays text, draws a simple box containing text, displays an icon or a bit map, or shows a framed or unframed colored box. Applications can specify a combination of the following styles for a static control: Static-Control Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_BITMAP ΓöéDraws a bit map. The bit map resource must beΓöé Γöé Γöéprovided in the resource-definition file. To Γöé Γöé Γöéinclude the bit map in a dialog window, the Γöé Γöé Γöéresource identifier must be specified in the Γöé Γöé Γöétext parameter of the CONTROL statement in Γöé Γöé Γöéthe resource definition file. To include the Γöé Γöé Γöébit map in a non-dialog window, the ASCII Γöé Γöé Γöérepresentation of the identifier must be Γöé Γöé Γöéspecified in the pszName parameter of the Γöé Γöé ΓöéWinCreateWindow function. That is, the first Γöé Γöé Γöébyte of the pszName parameter must be the Γöé Γöé Γöécross-hatch character (#), and the remaining Γöé Γöé Γöétext must be the ASCII representation of the Γöé Γöé Γöéidentifier (for example, #125). Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_BKGNDFRAME ΓöéCreates a box whose frame has the background Γöé Γöé Γöécolor. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_BKGNDRECT ΓöéCreates a rectangle filled with the Γöé Γöé Γöébackground color. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_FGNDFRAME ΓöéCreates a box whose frame has the foreground Γöé Γöé Γöécolor. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_FGNDRECT ΓöéCreates a rectangle filled with the Γöé Γöé Γöéforeground color. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_GROUPBOX ΓöéCreates a box whose upper-right corner Γöé Γöé Γöécontains control text. This style is useful Γöé Γöé Γöéfor enclosing groups of radio buttons or Γöé Γöé Γöécheck boxes in a box. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_HALFTONEFΓöéCreates a box whose frame has halftone Γöé Γöé Γöéshading. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_HALFTONERECTΓöéCreates a box filled with halftone shading. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_ICON ΓöéDraws an icon. The resource identifier for Γöé Γöé Γöéthe icon resource is determined the same way Γöé Γöé Γöéas the SS_BITMAP style. The icon resource Γöé Γöé Γöémust be in the resource-definition file. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_SYSICON ΓöéDraws a system-pointer icon. The resource Γöé Γöé Γöéidentifier for the system-pointer resource isΓöé Γöé Γöédetermined the same way as the SS_BITMAP Γöé Γöé Γöéstyle. To display this system pointer, the Γöé Γöé Γöésystem calls WinQuerySysPointer with the Γöé Γöé Γöéspecified identifier. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSS_TEXT ΓöéCreates a box with formatted text. An Γöé Γöé Γöéapplication can combine various formatting Γöé Γöé Γöéoptions with this style to produce formatted Γöé Γöé Γöétext in the boundaries of the control. The Γöé Γöé Γöéformatting flags are the same as those used Γöé Γöé Γöéfor the WinDrawText function. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 16.1.4. Default Static-Control Performance ΓòÉΓòÉΓòÉ The messages specifically handled by the predefined static-control class (WC_STATIC) are as follows: Messages Handled by WC_STATIC Class ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSM_SETHANDLE ΓöéSets the handle associated Γöé Γöé Γöéwith the static control and Γöé Γöé Γöéinvalidates the control Γöé Γöé Γöéwindow, forcing it to be Γöé Γöé Γöéredrawn. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSM_QUERYHANDLE ΓöéReturns the handle associated Γöé Γöé Γöéwith the static-control Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ADJUSTWINDOWPOS ΓöéAdjusts the SWP structure so Γöé Γöé Γöéthat the new window size Γöé Γöé Γöématches the bit map, icon, or Γöé Γöé Γöésystem-pointer dimensions Γöé Γöé Γöéassociated with the static Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéSets the text for a Γöé Γöé Γöéstatic-text control. Loads theΓöé Γöé Γöébit map or icon resource for Γöé Γöé Γöéthe bit map or icon static Γöé Γöé Γöécontrol. Returns TRUE if the Γöé Γöé Γöéresource cannot be loaded. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéFrees the text for a Γöé Γöé Γöéstatic-text control. Destroys Γöé Γöé Γöéthe bit map or icon for a bit Γöé Γöé Γöémap or icon static control. Γöé Γöé ΓöéThe icon for a system-pointer Γöé Γöé Γöéstatic control is not Γöé Γöé Γöédestroyed because it belongs Γöé Γöé Γöéto the system. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_ENABLE ΓöéInvalidates the entire Γöé Γöé Γöéstatic-control window, forcingΓöé Γöé Γöéit to be redrawn. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HITTEST ΓöéReturns the value Γöé Γöé ΓöéHT_TRANSPARENT for the Γöé Γöé Γöéfollowing static-control Γöé Γöé Γöéstyles: BKGNDFRAME Γöé Γöé ΓöéSS_BKGNDRECT Γöé Γöé ΓöéSS_FGNDFRAME Γöé Γöé ΓöéSS_FGNDRECT Γöé Γöé ΓöéSS_GROUPBOX Γöé Γöé ΓöéSS_HALFTONEFRAME Γöé Γöé ΓöéSS_HALFTONERECT. Γöé Γöé ΓöéFor other styles, this messageΓöé Γöé Γöéreturns the result of the Γöé Γöé ΓöéWinDefWindowProc function. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MATCHMNEMONIC ΓöéReturns TRUE if the mnemonic Γöé Γöé Γöépassed in the mp1 parameter Γöé Γöé Γöématches the mnemonic in the Γöé Γöé Γöécontrol-window text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MOUSEMOVE ΓöéSets the mouse pointer to the Γöé Γöé Γöéarrow pointer and returns Γöé Γöé ΓöéTRUE. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéDraws the static control basedΓöé Γöé Γöéon its style attributes. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYDLGCODE ΓöéReturns the predefined Γöé Γöé Γöéconstant DLGC_STATIC. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéReturns the requested window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETFOCUS ΓöéSets the focus to the next Γöé Γöé Γöésibling window that can acceptΓöé Γöé Γöéthe focus; or if no such Γöé Γöé Γöésibling exists, sets the focusΓöé Γöé Γöéto the parent window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéAllows the text to be set Γöé Γöé Γöé(static-text controls only). Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 16.2. Using Static Controls ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Include a static control in a dialog window. o Include a static control in a client window. ΓòÉΓòÉΓòÉ 16.2.1. Including a Static Control in a Dialog Window ΓòÉΓòÉΓòÉ To include a static control in a dialog window, you must define the control in a dialog-window template in a resource-definition file. The following resource-definition file creates a dialog window that contains a static-text control and three static-icon controls: DLGTEMPLATE IDD_TOOLDLG LOADONCALL MOVEABLE DISCARDABLE BEGIN DIALOG "", IDD_TOOLDLG, 114, 53, 161, 127, FS_NOBYTEALIGN | FS_DLGBORDER | WS_VISIBLE | WS_SAVEBITS BEGIN CTEXT "Select a tool", IDS_TEXT, 49, 110, 56, 8, SS_TEXT | DT_CENTER | DT_TOP | WS_GROUP | WS_VISIBLE AUTORADIOBUTTON "Paintbrush", IDB_BRUSH, 63, 87, 61, 10, WS_TABSTOP | WS_GROUP | WS_VISIBLE AUTORADIOBUTTON "Scissors", IDB_SCISSORS, 63, 64, 60, 10, WS_TABSTOP | WS_VISIBLE AUTORADIOBUTTON "Eraser", IDB_ERASER, 65, 39, 43, 10, WS_TABSTOP | WS_VISIBLE ICON IDI_BRUSH, IDI_BRUSHICON, 33, 84, 22, 16, WS_GROUP | WS_VISIBLE ICON IDI_SCISSORS, IDI_SCISSORSICON, 33, 60, 22, 16, WS_GROUP | WS_VISIBLE ICON IDI_ERASER, IDI_ERASERICON, 33, 36, 22, 16, WS_GROUP | WS_VISIBLE PUSHBUTTON "OK", DID_OK, 10, 12, 38, 13, WS_TABSTOP | WS_GROUP | WS_VISIBLE PUSHBUTTON "Cancel", DID_CANCEL, 59, 12, 38, 13, BS_DEFAULT | WS_TABSTOP | WS_GROUP | WS_VISIBLE PUSHBUTTON "Help", IDB_HELP, 111, 13, 38, 13, BS_HELP | WS_TABSTOP | WS_GROUP | WS_VISIBLE END END ICON IDI_BRUSH brush.ico ICON IDI_SCISSORS scissr.ico ICON IDI_ERASER eraser.ico ΓòÉΓòÉΓòÉ 16.2.2. Including a Static Control in a Client Window ΓòÉΓòÉΓòÉ An application can include a static control in a non-dialog window by calling WinCreateWindow with the window class WC_STATIC. The flStyle parameter to WinCreateWindow defines the appearance of the control. The following code fragment creates a static text control whose size and position are based on the size of the client window and the metrics for the current font: #define ID_TITLE 5 HWND hwnd,hwndStatic,hwndClient; HPS hps; RECTL rcl; FONTMETRICS fm; ULONG ulTitleLen; CHAR szTitle[] = "Static Text Controls"; /* Obtain the size of the client window. */ WinQueryWindowRect(hwnd, &rcl); /* Obtain a presentation space handle and the metrics for * the current font. */ hps = WinBeginPaint (hwnd, (HPS) NULL, (PRECTL) NULL); GpiQueryFontMetrics(hps, sizeof(FONTMETRICS), &fm); /* Obtain the size of the static-control text string. */ ulTitleLen = (ULONG) strlen(szTitle); /* Create the static control. Base the size and position * on the size of the client window and the metrics of the * current font. */ hwndStatic = WinCreateWindow( hwndClient, /* Parent window */ WC_STATIC, /* Window class */ szTitle, /* Window text */ WS_VISIBLE | /* Make it visible */ SS_TEXT | /* Static-text control */ DT_VCENTER | /* Center text vertically */ DT_CENTER, /* Center text horizontally */ ((rcl.xRight / 2) - (ulTitleLen / 2) * fm.lEmInc),/* x position */ rcl.yTop - fm.lEmHeight * 2, /* y position */ fm.lEmInc * ulTitleLen, /* Width */ fm.lEmHeight * 2, /* Height */ hwndClient, /* Owner window */ HWND_TOP, /* Top of z-order */ ID_TITLE, /* Window identifier */ NULL, /* Control data */ NULL); /* Presentation parameters */ WinEndPaint(hps); If your application creates a static control with the SS_ICON or SS_BITMAP style, make sure that the resource identifier specified in the pszName parameter corresponds to an icon or a bit map resource in the resource-definition file. If there is no resource, the application cannot create the static control. ΓòÉΓòÉΓòÉ 16.3. Summary ΓòÉΓòÉΓòÉ Following are the operating system functions and messages used with static controls: Static-Control Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQuerySysPointer ΓöéReturns the system pointer handle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowPos ΓöéAllows the general positioning of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowText ΓöéSets the window text for a specifiedΓöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWindowFromID ΓöéReturns the handle of the child Γöé Γöé Γöéwindow with the specified identity. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Static-Control Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSM_QUERYHANDLE ΓöéReturns the icon or bit map handle Γöé Γöé Γöéof a static control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSM_SETHANDLE ΓöéSets the icon or bit map handle of aΓöé Γöé Γöéstatic control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_MATCHMNEMONIC ΓöéSent by the dialog box to a control Γöé Γöé Γöéwindow to determine whether a typed Γöé Γöé Γöécharacter matches a mnemonic in its Γöé Γöé Γöéwindow text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé Γöéconversion of DBCS characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe static control window procedure Γöé Γöé Γöéwindow parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the static control window Γöé Γöé Γöéprocedure window parameters. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 17. Title-Bar Controls ΓòÉΓòÉΓòÉ A title-bar is one of several control windows that comprise a standard frame window, giving the frame window its distinctive look and performance capabilities. This chapter describes how to create and use title-bar control windows in PM applications. ΓòÉΓòÉΓòÉ 17.1. About Title Bars ΓòÉΓòÉΓòÉ The title bar in a standard frame window performs the following four functions: o Displays the title of the window across the top of the frame window. o Changes its highlighted appearance to show whether the frame window is active. (Ordinarily, the topmost window on the screen is the active window.) o Responds to the actions of the user-for example, dragging the frame window to a new location on the screen. o Flashes (as a result of the WinFlashWindow function) to get the attention of the user. Title Bar in a Standard Frame Window Once the frame controls are in place in the frame window, an application typically ignores them, because the system handles frame controls. In some cases, however, an application can take control of the title bar by sending messages to the title-bar control window. ΓòÉΓòÉΓòÉ 17.1.1. Default Title-Bar Behavior ΓòÉΓòÉΓòÉ A title-bar control window sends messages to its owner (the frame window) when the control receives user input. Following are the messages that the title-bar control processes. Each message is described in terms of how the title-bar control responds to that message. Messages Processed by Title-Bar Control ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTBM_QUERYHILITE ΓöéReturns the highlighted state of theΓöé Γöé Γöétitle bar. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTBM_SETHILITE ΓöéSets the highlighted state of the Γöé Γöé Γöétitle bar, repainting the title bar Γöé Γöé Γöéif the state is changing. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéRestores the title bar if the owner Γöé Γöé Γöéwindow is minimized or maximized. Γöé Γöé ΓöéIf the window is neither minimized Γöé Γöé Γöénor maximized, this message Γöé Γöé Γöémaximizes the window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéSends the WM_TRACKFRAME message to Γöé Γöé Γöéthe owner window to start the Γöé Γöé Γöétracking operation for the frame Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéSets the text for the title bar. Γöé Γöé ΓöéReturns FALSE if the text is alreadyΓöé Γöé Γöéset. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéFrees the window text for the title Γöé Γöé Γöébar. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HITTEST ΓöéAlways returns HT_NORMAL, so that Γöé Γöé Γöéthe title bar does not beep when it Γöé Γöé Γöéis disabled. (It is disabled when Γöé Γöé Γöéthe frame window is maximized.) Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéDraws the title bar. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYDLGCODE ΓöéReturns the predefined constant Γöé Γöé ΓöéDLGC_STATIC. The user cannot use theΓöé Γöé ΓöéTab key to move to the title bar in Γöé Γöé Γöéa dialog window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéReturns the requested window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéSets the specified window Γöé Γöé Γöéparameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_WINDOWPOSCHANGED ΓöéReturns FALSE. Processes this Γöé Γöé Γöémessage to prevent the Γöé Γöé ΓöéWinDefWindowProc function from Γöé Γöé Γöésending the size and show messages. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 17.2. Using Title-Bar Controls ΓòÉΓòÉΓòÉ This section explains how to: o Include a title bar in a frame window. o Alter the dragging action of a title bar. ΓòÉΓòÉΓòÉ 17.2.1. Including a Title Bar in a Frame Window ΓòÉΓòÉΓòÉ An application can include a title bar in a standard frame window by specifying the FCF_TITLEBAR flag in the WinCreateStdWindow function. The following code fragment shows how to create a standard frame window with a title bar, minimize and maximize (window-sizing) buttons, size border, system menu, and an application menu. #define ID_MENU_RESOURCE 101 HWND hwndFrame,hwndClient; UCHAR szClassName[255]; ULONG flControlStyle = FCF_TITLEBAR | FCF_MINMAX | FCF_SIZEBORDER | FCF_SYSMENU | FCF_MENU; hwndFrame = WinCreateStdWindow(HWND_DESKTOP, WS_VISIBLE | FS_ACCELTABLE, &flControlStyle, szClassName, "", 0, (HMODULE) NULL, ID_MENU_RESOURCE, &hwndClient); #define ID_MENU_RESOURCE 101 HWND hwndFrame,hwndClient; UCHAR szClassName[255]; ULONG flControlStyle = FCF_TITLEBAR | FCF_MINMAX | FCF_SIZEBORDER | FCF_SYSMENU | FCF_MENU; hwndFrame = WinCreateStdWindow(HWND_DESKTOP, WS_VISIBLE | FS_ACCELTABLE, &flControlStyle, szClassName, "", 0, (HMODULE) NULL, ID_MENU_RESOURCE, &hwndClient); To get the window handle of a title-bar control, an application calls WinWindowFromID, specifying the frame-window handle and a constant identifying the title-bar control, as shown in the following code fragment: hwndTitleBar = WinWindowFromID(hwndFrame, FID_TITLEBAR); To set the text of a title bar, an application can use the WinSetWindowText function. The frame window passes the new text to the title-bar control in a WM_SETWINDOWPARAMS message. ΓòÉΓòÉΓòÉ 17.2.2. Altering Dragging Action ΓòÉΓòÉΓòÉ When the user clicks the title bar, the title-bar control sends a WM_TRACKFRAME message to its owner (the frame window). When the frame window receives the WM_TRACKFRAME message, the frame sends a WM_QUERYTRACKINFO message to itself to fill in a TRACKINFO structure that defines the tracking parameters and boundaries. To modify the default behavior, an application must subclass the frame window, intercept the WM_QUERYTRACKINFO message, and modify the TRACKINFO structure. If the application returns TRUE for the WM_QUERYTRACKINFO message, the tracking operation proceeds according to the information in the TRACKINFO structure. If the application returns FALSE, no tracking occurs. ΓòÉΓòÉΓòÉ 17.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions, structures, and messages used with title-bar controls. Title-Bar Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateStdWindow ΓöéCreates a standard window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinFlashWindow ΓöéStarts or stops the flashing of a Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetWindowText ΓöéSets the window text for a specifiedΓöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinWindowFromID ΓöéReturns the handle of the child Γöé Γöé Γöéwindow with the specified identity. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Title-Bar Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSWP ΓöéSet window position structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTRACKINFO ΓöéTracking information structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Title-Bar Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTBM_QUERYHILITE ΓöéReturns the highlighting state of a Γöé Γöé Γöétitle-bar control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTBM_SETHILITE ΓöéUsed to highlight or unhighlight a Γöé Γöé Γöétitle-bar control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DBLCLK ΓöéOccurs when the user presses button Γöé Γöé Γöé1 of the pointing device twice. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_BUTTON1DOWN ΓöéOccurs when the user presses pointerΓöé Γöé Γöébutton 1. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CREATE ΓöéOccurs when an application requests Γöé Γöé Γöéthe creation of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DESTROY ΓöéOccurs when an application requests Γöé Γöé Γöéthe destruction of a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_HITTEST ΓöéSent to determine which window is Γöé Γöé Γöéassociated with an input from the Γöé Γöé Γöépointing device. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PAINT ΓöéOccurs when a window needs Γöé Γöé Γöérepainting. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYCONVERTPOS ΓöéSent by an application to determine Γöé Γöé Γöéwhether it is appropriate to begin Γöé Γöé Γöéconversion of DBCS characters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYDLGCODE ΓöéSent by the dialog manager to Γöé Γöé Γöéidentify the type of control, to Γöé Γöé Γöédetermine what kinds of messages theΓöé Γöé Γöécontrol understands, and to Γöé Γöé Γöédetermine whether an input message Γöé Γöé Γöécan be processed by the dialog Γöé Γöé Γöémanager or passed down to the Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe title-bar control window Γöé Γöé Γöéprocedure window parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the title-bar control windowΓöé Γöé Γöéprocedure window parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TRACKFRAME ΓöéSent to a window whenever it is to Γöé Γöé Γöébe moved or sized. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_WINDOWPOSCHANGED ΓöéSent to the window procedure of the Γöé Γöé Γöéwindow whose position is changed. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 18. Container Controls ΓòÉΓòÉΓòÉ A container control (WC_CONTAINER window class) is a visual component that holds objects. It provides a powerful and flexible component for easily developing products that conform to the Common User Access (CUA) user interface guidelines. This chapter describes the container control component and how to use it in PM applications. ΓòÉΓòÉΓòÉ 18.1. About Container Controls ΓòÉΓòÉΓòÉ A container can display objects in various formats and views. Generally speaking, each view displays different information about each object. If a container's data is too large for the window's client area (hereinafter referred to as work area in accordance with CUA guidelines), scrolling mechanisms are enabled. The CUA direct manipulation protocol is fully supported, enabling a user to visually drag an object in a container window and drop it on another object or container window. Containers are an integral component of the CUA user interface. For a complete description of CUA containers, refer to the SAA CUA Guide to User Interface Design and the SAA CUA Advanced Interface Design Reference. ΓòÉΓòÉΓòÉ 18.1.1. Container Control Functions ΓòÉΓòÉΓòÉ The container control implements the following functions: o Multiple types of views of a container's contents, such as: - Icon view - Name view - Text view - Tree view - Details view. o Switching between container views quickly and easily o Sharing records among multiple containers in the same process o Displaying each view with a different font o Directly editing container control text in all views, including blank text fields o A split bar for vertically splitting the details view into two parts so that a user can widen one part to see more information o Supporting various data types, such as: - Icons or bit maps for the icon, name, tree, and details views. In the details view, this includes the ability to use icons or bit maps in column headings as well as in the columns themselves. - Text that is supported in the following situations: o For container titles in all views o Beneath icons or bit maps in the icon view o To the right of icons or bit maps in the name and tree views o For any column or column heading in the details view o For container items in the text view. - Date, time, and number format, for container items in the details view. o Direct manipulation o Selection types, such as: - Single selection - Extended selection - Multiple selection. o Selection techniques, such as: - Marquee selection - Two-swipe selections, such as: o Touch swipe o Range swipe. - First-letter selection. o Selection mechanisms, such as: - Any pointing device - Keyboard. o Multiple forms of emphasis: - In-use emphasis - Selected-state emphasis - Target emphasis. o Ownerdraw, which enables an application to draw the container items instead of the container control's drawing them. In the details view, this can be done for each column. o Sorting and filtering container items o Arranging container items in the icon view, such as: - Automatic reposition mode that, when set, repositions container items as a result of inserting, removing, sorting, or filtering items, or changing window or font size - Arrange message mode that arranges overlapping icons or bit maps so that they no longer overlap. o Scrolling a container's work area, such as: - When the current size of a container's work area is not large enough for all the container items to be visible - Dynamic scrolling to provide visible feedback, showing the movement of the container items relative to the position of the scroll box. o Data caching: - To efficiently remove items from, and insert items in, a container as they scroll in and out of view. o An option to optimize memory usage. ΓòÉΓòÉΓòÉ 18.1.2. Container Control Basics ΓòÉΓòÉΓòÉ This section contains basic information about the container control that you need to understand before reading the remainder of the chapter. This important information is presented in the following order: o Creating a container o Understanding container items o Allocating memory for container records and columns o Understanding container views o Changing a container view. ΓòÉΓòÉΓòÉ 18.1.2.1. Creating a Container ΓòÉΓòÉΓòÉ You create a container by using the WC_CONTAINER window class name in the ClassName parameter of the WinCreateWindow function. The following figure shows the creation of the container. The styles specified in the ulCnrStyles variable (the CCS_* values) specifies that the container is to be created with the automatic positioning of container items and extended selection. Sample Code for Creating a Container HWND hwndCnr; /* Container window handle */ ULONG ulCnrStyles; /* Container window styles */ /**********************************************************************/ /* Set CCS_* flags to customize the */ /* container. */ /**********************************************************************/ ulCnrStyles = CCS_AUTOPOSITION | /* Auto position */ CCS_ EXTENDSEL; /* Extended selection */ /**********************************************************************/ /* Create the container control window. */ /**********************************************************************/ hwndCnr = WinCreateWindow( ClientHwnd, /* Parent window handle */ WC_CONTAINER, /* Container class name */ NULL, /* No window text */ ulCnrStyles, /* Container styles */ (LONG)10, /* X coordinate */ (LONG)10, /* Y coordinate */ (LONG)300, /* Window width */ (LONG)200, /* Window height */ ClientHwnd, /* Owner window handle */ HWND_TOP, /* Sibling window handle */ CONTAINER_ID, /* Container window ID */ NULL, /* No control data */ NULL); /* No presentation parameters */ /**********************************************************************/ /* Make the container control visible. */ /**********************************************************************/ WinShowWindow( hwndCnr, /* Container window handle */ TRUE); /* Make the window visible */ The container is created with a default set of control data, which can be changed using the CM_SETCNRINFO message. Refer to the OS/2 2.0 Programming Reference for a list of the default control data for the CNRINFO data structure. ΓòÉΓòÉΓòÉ 18.1.2.2. Understanding Container Items ΓòÉΓòÉΓòÉ Container items can be anything that your application or a user might store in a container. Examples are executable programs, word processing files, graphics images, and database records. Container item data is stored in RECORDCORE and MINIRECORDCORE data structures. Both the application and the container have access to the data stored in these records. Refer to the OS/2 2.0 Programming Reference for more information about the RECORDCORE and MINIRECORDCORE data structures. The application is responsible for allocating memory for each record by using the CM_ALLOCRECORD message. See Allocating Memory for Container Records and Allocating Memory for Container Columns for more information. The maximum number of records is limited by the amount of memory in the user's computer. The container control does not limit the number of records that a container can have. The following list shows which types of data can be displayed for each container view. See Understanding Container Views for descriptions of the container views. Types of Container Views for Displaying Types of Data ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéView Types ΓöéData Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéIcon ΓöéIcons or bit maps with text strings beneath. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéName ΓöéIcons or bit maps with text strings to the Γöé Γöé Γöéright. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéText ΓöéText strings. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTree ΓöéIcons or bit maps, and text strings. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDetails ΓöéIcons or bit maps, text strings, numbers, Γöé Γöé Γöétimes, and dates. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 18.1.2.3. Allocating Memory for Container Records ΓòÉΓòÉΓòÉ Your application is required to allocate memory for a container record by using the CM_ALLOCRECORD message, which also enables you to allocate memory for additional application data. The sample code in the following figure shows how to allocate memory for one record. A pointer to the record is returned. Sample Code for Allocating Memory for Container Records HWND hwndCnr; /* Container window handle */ PRECORDCORE pRecord; /* Pointer to RECORDCORE structure */ ULONG nRecords = 1; /* 1 record to be allocated */ pRecord = (PRECORDCORE)WinSendMsg( hwndCnr, /* Container window handle */ CM_ALLOCRECORD, /* Message for allocating the record */ (MPARAM)NULL, /* No additional memory */ (MPARAM)nRecords); /* Number of records to be allocated */ Your application also can use the CM_ALLOCRECORD message to allocate memory for more than one container record. The application can request n container records with the nRecords parameter. If n is greater than one, the pRecord parameter returns a pointer to the first record in a linked list of n records. Refer to the OS/2 2.0 Programming Reference for a description of the CM_ALLOCRECORD message and the RECORDCORE data structure. ΓòÉΓòÉΓòÉ 18.1.2.4. Allocating Memory for Container Columns ΓòÉΓòÉΓòÉ In addition to allocating memory for records, an application also must allocate memory for columns of data if the details view is used. In the details view, a container's data is displayed in columns, each of which is described in a FIELDINFO data structure. Memory is allocated for FIELDINFO data structures using the CM_ALLOCDETAILFIELDINFO message. Unlike the CM_ALLOCRECORD message, the CM_ALLOCDETAILFIELDINFO message does not allow the application to allocate memory for additional application data. However, the pUserData field of the FIELDINFO data structure can be used to store a pointer to the application-allocated data. Multiple FIELDINFO data structures can be allocated with the nFieldInfo parameter of the CM_ALLOCDETAILFIELDINFO message. See Details View for a description of the details view. Refer to the OS/2 2.0 Programming Reference for descriptions of the FIELDINFO data structure and the CM_ALLOCDETAILFIELDINFO message. ΓòÉΓòÉΓòÉ 18.1.3. Understanding Container Views ΓòÉΓòÉΓòÉ When a user opens a container, the contents of that container are displayed in a window. A container window can present various views of its contents. Each view can provide different information about its container items. The container control provides the following views: Views of a Container's Contents ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéType of View ΓöéContents Displayed Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéIcon view ΓöéDisplays either icons or bit maps, with text Γöé Γöé Γöébeneath the icons or bit maps, to represent Γöé Γöé Γöécontainer items. These are called icon/text Γöé Γöé Γöéor bit-map/text pairs. Each icon/text or Γöé Γöé Γöébit-map/text pair represents one container Γöé Γöé Γöéitem. This is the default view. See Icon Γöé Γöé ΓöéView for a description of the icon view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéName view ΓöéDisplays either icons or bit maps, with text Γöé Γöé Γöéto the right of the icons or bit maps, to Γöé Γöé Γöérepresent container items. These are called Γöé Γöé Γöéicon/text or bit-map/text pairs. Each Γöé Γöé Γöéicon/text or bit-map/text pair represents oneΓöé Γöé Γöécontainer item. See Name View for a Γöé Γöé Γöédescription of the name view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéText view ΓöéDisplays a simple text list to represent Γöé Γöé Γöécontainer items. See Text View for a Γöé Γöé Γöédescription of the text view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTree view ΓöéDisplays a hierarchical view of the containerΓöé Γöé Γöéitems. Three types of tree views are Γöé Γöé Γöéavailable: tree text, tree icon, and tree Γöé Γöé Γöéname. See Tree View for a description of theΓöé Γöé Γöétree view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDetails view ΓöéDisplays detailed information about each Γöé Γöé Γöécontainer item. The same type of data is Γöé Γöé Γöédisplayed for each container item, arranged Γöé Γöé Γöéin columns. The data in each column can Γöé Γöé Γöéconsist of an icon or bit map, text, numbers,Γöé Γöé Γöédates, or times. See Details View for a Γöé Γöé Γöédescription of the details view. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ The container control does not support both icons and bit maps in the same view. To specify whether icons or bit maps are used, an application can set either the CA_DRAWICON attribute or CA_DRAWBITMAP attribute, respectively, in the flWindowAttr field. The default is the CA_DRAWICON attribute. The size of the icon or bit map can be specified in the slBitmapOrIcon field. flWindowAttr and slBitmapOrIcon are fields of the CNRINFO data structure. Refer to the OS/2 2.0 Programming Reference for a description of the CNRINFO data structure. If a text string is not specified for a view in a place where a text string could be used, a blank space is used as a placeholder. For example, if a text string is not placed beneath an icon in the icon view, a blank space is inserted just as though the text string was there. If this blank space is not a read-only field, the user can put text in the space by editing it directly. See Direct Editing of Text in a Container for more information about editing text directly in a container control. ΓòÉΓòÉΓòÉ 18.1.4. Icon View ΓòÉΓòÉΓòÉ The icon view (CV_ICON attribute) displays icon/text pairs or bit-map/text pairs to represent container items; this is the default. CV_ICON is an attribute of the CNRINFO data structure's flWindowAttr field. In the icon view, icon/text pairs and bit-map/text pairs are icons and bit maps, respectively, with one or more lines of text displayed below each icon or bit map. Each line can contain one or more text characters, which are centered below the icon or bit map. The container control does not limit the number of lines or the number of characters in each line. Generally, the icon or bit map contains an image that depicts the type of container item that it represents. For example, an icon or bit map that represents a bar chart might contain an image of a bar chart. In the icon view, container items are positioned according to x- and y-coordinate positions. These are called workspace coordinates. You can supply these coordinates for each container item by using the ptlIcon field of the RECORDCORE data structure. See Positioning Container Items for information about using workspace coordinates to position container items. Refer to the OS/2 2.0 Programming Reference for a description of the RECORDCORE data structure. The following figure provides an example of the icon view with various x- and y-coordinates specified in the ptlIcon field. Icon View with Items Positioned at Workspace Coordinates If you do not specify x- and y-coordinate positions, the container control positions the icons or bit maps at (0,0). However, your application can arrange the icons or bit maps either by sending the CM_ARRANGE message or by setting the CCS_AUTOPOSITION style bit when creating a container. With both of these methods, the container items are arranged in rows, and any coordinates specified in the ptlIcon field are ignored. The container items fill the topmost row until the width of the work area is reached. The container items then wrap to form another row immediately below the filled row. This process is repeated until all the container items are positioned in rows. Default spacing is implemented according to the guidelines for the CUA user interface. The following figure shows an example of the container after the CM_ARRANGE message was sent, or if the container was created with the CCS_AUTOPOSITION style bit set. Icon View When Items Are Arranged or Automatically Positioned If the CCS_AUTOPOSITION style bit is set and the container is displaying the icon view, container items are arranged automatically without the CM_ARRANGE message being sent when: o The window size changes o Container items are inserted, removed, sorted, invalidated, or filtered o The font or font size changes. In all of these cases, container items are arranged the same as when the CM_ARRANGE message is sent. The CCS_AUTOPOSITION style bit is valid only when it is used with the icon view. If the CM_ARRANGE message is issued and the container control is not currently displaying the icon view, the container items are still arranged logically. Nothing changes in the current view; the arrangement of the container items is not visible until the user switches to the icon view. ΓòÉΓòÉΓòÉ 18.1.5. Name View ΓòÉΓòÉΓòÉ The name view (CV_NAME attribute) displays icon/text or bit-map/text pairs to represent container items. CV_NAME is an attribute of the CNRINFO data structure's flWindowAttr field. In the name view, icon/text pairs and bit-map/text pairs are icons and bit maps, respectively, with one or more lines of text displayed to the right of each icon or bit map. Each line can contain one or more text characters, which are left-justified. The container control does not limit the number of lines or the number of characters in each line. The container control offers the option of flowing or not flowing the container items in the name view. To flow container items means to dynamically arrange them in columns. ΓòÉΓòÉΓòÉ 18.1.5.1. Non-Flowed Name View ΓòÉΓòÉΓòÉ If the container items are not flowed, the icon/text or bit-map/text pairs are placed in a single column in the leftmost portion of the work area, as in the following figure. Non-Flowed Name View ΓòÉΓòÉΓòÉ 18.1.5.2. Flowed Name View ΓòÉΓòÉΓòÉ If the container items are flowed (CV_NAME | CV_FLOW), the container appears, as shown in the following figure. In this case, the container items fill the leftmost column until the depth of the work area is reached. The container items then wrap to form another column immediately to the right of the filled column. This process is repeated until all of the container items are positioned in columns. The width of each column is determined by the widest text string within the column. The depth of the work area is determined by the size of the window. Flowed Name View ΓòÉΓòÉΓòÉ 18.1.6. Text View ΓòÉΓòÉΓòÉ The text view (CV_TEXT attribute) displays one or more lines of text to represent container items. CV_TEXT is an attribute of the CNRINFO data structure's flWindowAttr field. Each line can contain one or more text characters, which are left-justified. The container control does not limit the number of lines or the number of characters in each line. The container control offers the option of flowing or not flowing the container items in the text view. ΓòÉΓòÉΓòÉ 18.1.6.1. Non-Flowed Text View ΓòÉΓòÉΓòÉ If the text strings are not flowed, the text for each container item is placed in a single column in the leftmost portion of the work area, as shown in the following figure. Non-Flowed Text View ΓòÉΓòÉΓòÉ 18.1.6.2. Flowed Text View ΓòÉΓòÉΓòÉ If the text strings are flowed (CV_TEXT | CV_FLOW), the container appears as shown in the following figure. In this case, the text strings fill the leftmost column until the depth of the work area is reached. The text strings then wrap to form another column immediately to the right of the filled column. This process is repeated until all the text strings are positioned in columns. The width of each column is determined by the widest text string within the column. The depth of the work area is determined by the size of the window. Flowed Text View ΓòÉΓòÉΓòÉ 18.1.7. Tree View ΓòÉΓòÉΓòÉ The tree view (CV_TREE attribute) displays container items arranged hierarchically. CV_TREE is an attribute of the CNRINFO data structure's flWindowAttr field. The leftmost items displayed in the tree view are at the root level and are the same items displayed in all the other container views. Items that contain other items are called parent items. The item or items that a parent item contains are called child items and can be displayed only in the tree view. Child items that contain other items serve a dual role: they are the children of their parent item, but they are parent items as well, with children of their own. For example, a parent item might be a book that contains individual child items for its chapters, or a folder that contains several reports. The chapters or reports, in turn, could be parent items that contain their own children, such as the major sections of a chapter or report. If the child item or items of a parent item are not displayed, the parent item can be expanded to display them as a new branch in the tree view. Once a parent item has been expanded, it can be collapsed to remove its child items from the display. You can use the cxTreeIndent and cxTreeLine fields of the CNRINFO data structure to specify the number of pels that a new branch is to be indented horizontally, and the width of the lines that are used to connect branches of the tree. These lines are displayed only if the CA_TREELINE attribute is specified in the flWindowAttr field. The tree view has three different types: tree icon view, tree text view, and tree name view. The following figure uses the tree icon view to provide examples of root level, parent, and child items that were defined in this section. The expanded and collapsed bit maps shown in this figure are defined in the following section. Sample Tree View Showing Root Level, Parent, and Child Items ΓòÉΓòÉΓòÉ 18.1.7.1. Tree Icon View and Tree Text View ΓòÉΓòÉΓòÉ The tree icon and tree text views are identical in every aspect except one: their appearance on the screen. Container items in the tree icon view (CV_TREE | CV_ICON) are displayed as either icon/text pairs or bit-map/text pairs. The items are drawn as icons or bit maps with one or more lines of text displayed to the right of each icon or bit map. The following figure provides an example of a tree icon view that uses the default expanded and collapsed bit maps. Tree Icon View Container items in the tree text view (CV_TREE | CV_TEXT) are displayed as text strings. In both views, the container control does not limit the number of lines of text or the number of characters in each line. The following figure provides an example of the tree text view, again showing the default expanded and collapsed bit maps. Tree Text View In the tree icon and tree text views, a parent item is expanded by selecting the collapsed icon/bit map, which is displayed to the left of the parent item. The collapsed icon/bit map should contain some visible indication that the item can be expanded. The default collapsed bit map that is provided by the container control uses a plus sign (+) to indicate that more items, the children of this parent, can be added to the view. When the child items of a parent item are displayed, the collapsed icon/bit map to the left of that parent item changes to an expanded icon/bit map. Just as the collapsed icon/bit map provides a visible indication that an item can be expanded, so should the expanded icon/bit map indicate that an item can be collapsed. The default expanded bit map provided by the container control uses a minus sign (-) to indicate that the child items of this parent can be subtracted from the view. If any of the child items have children of their own, a collapsed or expanded icon/bit map is displayed to their immediate left as well. To display your own collapsed and expanded icons or bit maps, specify their handles by using the hptrCollapsed and hptrExpanded fields of the CNRINFO data structure for icons, and the hbmCollapsed and hbmExpanded fields for bit maps. Also, you can use the slTreeBitmapOrIcon field to specify the size, in pels, of these collapsed and expanded icons and bit maps. Refer to the description of the CNRINFO data structure in the OS/2 2.0 Programming Reference for more information. ΓòÉΓòÉΓòÉ 18.1.8. Tree Name View ΓòÉΓòÉΓòÉ Container items in the tree name view (CV_TREE | CV_NAME) are displayed as either icon/text pairs or bit-map/text pairs. Similar to the tree icon view, the items are drawn as icons or bit maps with one or more lines of text displayed to the right of each icon or bit map. The container control does not limit the number of lines or the number of characters in each line of text. Unlike the tree icon view, however, separate collapsed and expanded icons/bit maps are not used. Instead, if an item is a parent, the icon or bit map that represents that item contains the same type of visible indication that is placed in a separate icon/bit map in the tree icon view to show that an item can be collapsed or expanded. In this way, the icon or bit map that represents the parent item can serve a dual purpose, and thus preserve space on the screen, an important consideration if the text strings used to describe items become too long. The container control does not provide default icons or bit maps for the tree name view. To display your own collapsed and expanded icons or bit maps, specify their handles using the hptrCollapsed and hptrExpanded fields of the TREEITEMDESC data structure for icons, and the hbmCollapsed and hbmExpanded fields for bit maps. Also, you can use the slBitmapOrIcon field of the CNRINFO data structure to specify the size, in pels, of these collapsed and expanded icons and bit maps. Refer to the description of the TREEITEMDESC and CNRINFO data structures in the OS/2 2.0 Programming Reference for more information about these data structures and the following figure for an example of the tree name view. Tree Name View ΓòÉΓòÉΓòÉ 18.1.9. Details View ΓòÉΓòÉΓòÉ The details view (CV_DETAIL attribute) of the container control can display the following data types to represent container items: icons or bit maps, text, numbers, dates, and times. CV_DETAIL is an attribute of the CNRINFO data structure's flWindowAttr field. The data is arranged in columns, which can have headings. Each column can contain data that belongs to only one of the valid data types. Column headings can contain text, icons, or bit maps. The width of each column can be explicitly specified in the cxWidth field of the FIELDINFO data structure. If a column width is not specified, it is determined by the widest entry in the column. Refer to the OS/2 2.0 Programming Reference for a description of the FIELDINFO data structure. Columns can be inserted or removed dynamically. All of the columns in a given row represent a single container item; selecting the data portion of a row selects the entire row, not just the individual column. Details view column headings and data can be top- or bottom-justified or vertically centered, as well as left- or right-justified or horizontally centered. In addition, horizontal separator lines can be specified between the column headings and the data; vertical separator lines can be placed between columns. In the example in the following figure, Container Items, the icon, Description, and Item Size are the column headings. Ownerdraw is supported for each column. Details View See Drawing Container Items and Painting Backgrounds for more information about ownerdraw. Split Bar Support for the Details View A split bar enables the application to split the container window vertically between two column boundaries. This function is available only in the details view. The two portions of the work area on either side of the split bar appear side-by-side. They scroll in unison vertically, but they scroll independently horizontally. The application is responsible for specifying the position of the split bar, which is defined with the xVertSplitbar field. Also, the rightmost column of the left split window is specified with the pFieldInfoLast field. xVertSplitbar and pFieldInfoLast are fields of the CNRINFO data structure. Refer to the OS/2 2.0 Programming Reference for a description of the CNRINFO data structure. The left split window cannot be empty if there is data in the right window. The right split window is not required to have data. However, because data cannot be scrolled from the right split window into the left split window, or from left to right, the split bar loses much of its usefulness if the right split window is empty. The user can drag the vertical split bar within the limits of the window. As the user drags the split bar to the left, the right split window becomes wider; and as the split bar is dragged to the right, the left split window becomes wider. Each container control can have one vertical split bar. Horizontal split bars are not supported. The following figure shows a split bar between the Description column and the Date Created column. Details View with Split Bar ΓòÉΓòÉΓòÉ 18.1.10. Changing a Container View ΓòÉΓòÉΓòÉ The sample code in the following figure shows how to use the CM_SETCNRINFO message to change from the current view of a container (name, details, or text) to the icon view. Sample Code for Changing a Container View CNRINFO cnrInfo; /**********************************************************************/ /* Set the attribute field to the icon view. */ /**********************************************************************/ cnrInfo.flWindowAttr = CV_ICON; /**********************************************************************/ /* Change the view from the current view to the icon view. */ /**********************************************************************/ WinSendMsg( hwndCnr, /* Container window handle */ CM_SETCNRINFO, /* Container message for setting */ MPFROMP(&cnrInfo), /* Container control data */ MPFROMLONG( CMA_FLWINDOWATTR)); /* Message attribute that sets */ /* container window attributes */ Refer to the OS/2 2.0 Programming Reference for a complete description of the CM_SETCNRINFO message. ΓòÉΓòÉΓòÉ 18.2. Using a Container ΓòÉΓòÉΓòÉ You need the following information to use a container control in your application after it is created: o Inserting container records o Removing container records o Setting the container control focus. ΓòÉΓòÉΓòÉ 18.2.1. Inserting Container Records ΓòÉΓòÉΓòÉ After the memory is allocated, you can insert one or more container records by using the CM_INSERTRECORD message. This message enables you to provide two pointers. The first pointer points to the record or records that are to be inserted, which is specified in the pRecord parameter. When you are inserting multiple records, use this parameter to specify a pointer to a linked list of records. The second pointer points to a RECORDINSERT data structure, which specifies information the container needs for inserting records. One of the elements of information that this data structure contains is the order in which the record or records are to be inserted, which is specified in the pRecordOrder field. In this field you have two options. The first option is to specify a pointer to a container record. The record or records being inserted will be placed immediately after that record. In this case, the pRecordParent field is ignored. The second option is to specify whether the record or records being inserted are to be placed at the beginning or end of a list of records. This is done by specifying either the CMA_FIRST or CMA_END attributes, respectively. If you choose this option, the list of records used depends on the value of the pRecordParent field. If CMA_FIRST or CMA_END is specified and the value of the pRecordParent field is NULL, the inserted record or records are placed at the beginning or end, respectively, of the root level records. However, if CMA_FIRST or CMA_END is specified and pRecordParent contains a pointer to a parent item record, the records are inserted at the beginning or end, respectively, of the list of child item records that this parent record contains. See Tree View for more information about root level, parent, and child items. The RECORDINSERT structure also lets you specify the z-order position of the record or records being inserted. The CMA_TOP and CMA_BOTTOM attributes of the zOrder field place the record at the top or bottom, respectively, relative to the other records in the z-order list. This field applies to the icon view only. To specify the number of records that are being inserted, use the cRecordsInsert field. The value of this field must be greater than 0. The last field in the RECORDINSERT structure is flInvalidateRecord, which enables you to control whether the record or records are displayed automatically when they are inserted. If you specify TRUE in this field, the display is updated automatically. However, if you specify FALSE, the application must send the CM_INVALIDATERECORD message after the record or records are inserted to update the display. Where items are positioned in a container depends on the view the user has specified. If the icon view is specified and the CCS_AUTOPOSITION style bit is not set, the x- and y-coordinates for each record, which are stored in the ptlIcon field of the RECORDCORE and MINIRECORDCORE data structures, determine its position. Records displayed in the name view, text view, tree view, and details view are positioned as previously described in this section. Note: Records inserted into a list of child record items can be displayed in the tree view only. These records will be visible only if the parent record item to which these child record items belong is expanded. The following figure provides sample code that inserts a record into a container. SampleCodeforInsertingaRecordintoaContainer typedef struct _USERRECORD { RECORDCORE RecordCore; /* RECORDCORE structure */ PSZ pszFile; /* Text string for the details view */ /* column */ CDATE Date; /* Date for details view column */ } USERRECORD, *PUSERRECORD; /* User-defined record declaration */ HWND hwndCnr; /* Container window handle */ PUSERRECORD pUserRecord; /* Pointer to user-defined data */ /* structure */ ULONG nRecords = 1; /* Number of records */ ULONG cbRecordData; /* Number of bytes of additional */ /* memory */ RECORDINSERT recordInsert; /* RECORDINSERT structure */ HPS hps; /* Handle to a presentation space */ HMODULE hmodIcons; /* Module handle for resources */ hps = WinGetPS (hwndCnr); DosLoadModule ("Container Tester", 16, "ICONS", &hmodIcons); /**********************************************************************/ /* Allocate memory for USERRECORD */ /**********************************************************************/ cbRecordData = (ULONG)(sizeof(USERRECORD) - sizeof(RECORDCORE)); pUserRecord = (PUSERRECORD)WinSendMsg( hwndCnr, CM_ALLOCRECORD, MPFROMLONG(cbRecordData), (MPARAM)nRecords); /**********************************************************************/ /* Allocate memory for text strings, as application requires. */ /**********************************************************************/ /**********************************************************************/ /* Initialize text strings. */ /**********************************************************************/ strcpy (pUserRecord->RecordCore.pszText, "Text View"); strcpy (pUserRecord->RecordCore.pszName, "Name View"); strcpy (pUserRecord->RecordCore.pszIcon, "Icon View"); strcpy (pUserRecord->RecordCore.pszTree, "Tree View"); strcpy (pUserRecord->pszFile, "File Name"); /**********************************************************************/ /* Initialize date. */ /**********************************************************************/ pUserRecord->Date.day = 5; pUserRecord->Date.month = 2; pUserRecord->Date.year = 91; /**********************************************************************/ /* Initialize attributes, icon, and bit-map pointers. */ /**********************************************************************/ pUserRecord->RecordCore.hptrIcon = WinLoadPointer(HWND_DESKTOP, hmodIcons, 5000); pUserRecord->RecordCore.hbmBitmap = GpiLoadBitmap(hps, hmodIcons, 8000, 0L, 0L); /**********************************************************************/ /* Initialize the record position for the icon view. */ /**********************************************************************/ pUserRecord->RecordCore.ptlIcon.x = 100; pUserRecord->RecordCore.ptlIcon.y = 200; /**********************************************************************/ /* Initialize CM_INSERTRECORD data structure. */ /**********************************************************************/ recordInsert.pRecordOrder = (PRECORDCORE)CMA_FIRST; recordInsert.zOrder = (ULONG)CMA_TOP; recordInsert.cRecordsInsert = nRecords; recordInsert.fInvalidateRecord = TRUE; recordInsert.pRecordParent = NULL; /**********************************************************************/ /* Insert record. */ /**********************************************************************/ WinSendMsg(hwndCnr, CM_INSERTRECORD, MPFROMP(pUserRecord), MPFROMP(&recordInsert)); /**********************************************************************/ /* Clean up. */ /**********************************************************************/ DosFreeModule(hmodIcons); WinReleasePS(hps); ΓòÉΓòÉΓòÉ 18.2.2. Removing Container Records ΓòÉΓòÉΓòÉ The CM_REMOVERECORD message can be used to remove one or more container records from the container control. The application must set the pointers to each record in an array to be removed. If the fRemoveRecord parameter of this message includes the CMA_FREE attribute, the records are removed and the memory is freed. If this attribute is not set, the records are removed from the list of items in the container, and the application must use the CM_FREERECORD message to free the memory. The default is to not free the memory. If the fRemoveRecord parameter includes the CMA_INVALIDATERECORD attribute, the container is invalidated after the records are removed. The default is to not invalidate the container. The CMA_INVALIDATERECORD attribute can be used with the CMA_FREE attribute, separated by a logical OR operator (|), to free the record's memory and invalidate the container. The sample code in the following figure removes all records from a container and frees the memory associated with those records. It is the application's responsibility to free all application-allocated memory that is associated with the removed container records. The container is invalidated and repainted. Sample Code for Removing Container Records USHORT cNumRecord; /* Number of records to be removed */ USHORT fRemoveRecord; /* Container message attributes */ /**********************************************************************/ /* Zero means remove all records. */ /**********************************************************************/ cNumRecord = 0; /**********************************************************************/ /* Specify attributes to invalidate the container and free the memory */ /**********************************************************************/ fRemoveRecord = CMA_INVALIDATERECORD | CMA_FREE; /**********************************************************************/ /* Remove the records. */ /**********************************************************************/ WinSendMsg(hwndCnr, /* Container window handle */ CM_REMOVERECORD, /* Container message for removing */ /* records */ NULL, /* NULL PRECORDARRAY */ MPFROM2SHORT( cNumRecord, /* Number of records */ fRemoveRecord)); /* Memory invalidation flags */ ΓòÉΓòÉΓòÉ 18.2.3. Setting the Container Control Focus ΓòÉΓòÉΓòÉ The application must set the focus of the container control by using the WinSetFocus function. ΓòÉΓòÉΓòÉ 18.3. Graphical User Interface Support ΓòÉΓòÉΓòÉ The following describes the container control support for graphical user interfaces (GUIs). Except where noted, this support conforms to the guidelines in the SAA CUA Advanced Interface Design Reference. The GUI support provided by the container control consists of: o Scrolling o Selecting container items o Providing emphasis o Using direct manipulation o Specifying space between container items. ΓòÉΓòÉΓòÉ 18.3.1. Scrolling ΓòÉΓòÉΓòÉ The container control automatically provides horizontal or vertical scroll bars, or both, whenever all or part of one or more container items are not visible in a container window's work area. If all container items are visible in the work area, the scroll bars are either removed or disabled, depending on the view and how the items are positioned, as follows: o If container items are displayed in the icon or tree view, and one or more items are not visible in the work area, a horizontal scroll bar, vertical scroll bar, or both, are provided, depending on the position of the items outside of the work area. If container items are positioned to the right or left of the work area, a horizontal scroll bar is provided; if container items are positioned below or above the work area, a vertical scroll bar is provided. Scroll bars are not provided if all the container items are visible in the work area. Scroll bars are removed from the container window if either of the following occurs: - Container items positioned outside the work area are moved into the work area - The size of the container window is increased so that container items formerly not visible become visible. o If container items are displayed in non-flowed text and non-flowed name views, a vertical scroll bar is provided; this scroll bar is disabled if all the container items are visible in the work area. A horizontal scroll bar is used in these views only when the work area is too narrow to allow the widest container item to be seen in its entirety. If the user changes the window size to allow the entire widest container item to be seen, the horizontal scroll bar is removed. o If container items are displayed in flowed text and flowed name views, a horizontal scroll bar is provided; this scroll bar is disabled if all the container items are visible in the work area. A vertical scroll bar is used in these views only when the work area is too short to allow the tallest container item to be seen in its entirety. If the user changes the window size to allow the entire tallest container item or items to be seen, the vertical scroll bar is removed. o If container items are displayed in the details view, both horizontal and vertical scroll bars are provided. These scroll bars are disabled if all the container items are visible in the work area. Note: A details view that is split has two horizontal scroll bars, one for each portion of the split window. ΓòÉΓòÉΓòÉ 18.3.2. Dynamic Scrolling ΓòÉΓòÉΓòÉ The container control supports dynamic scrolling, which enables the user to drag the scroll box in the scroll bar and get immediate visible feedback on where the scrolling will stop when the scroll box is dropped. If the scrolling range is greater than 32KB pels, dynamic scrolling is disabled. ΓòÉΓòÉΓòÉ 18.3.3. Selecting Container Items ΓòÉΓòÉΓòÉ Except during direct manipulation and direct editing of text in a container, a user must select a container item before performing an action on it. The container control provides several selection types, along with selection techniques to implement those types. The container control also supports two selection mechanisms: any pointing device, such as a mouse, and the keyboard. ΓòÉΓòÉΓòÉ 18.3.3.1. Selection Types ΓòÉΓòÉΓòÉ The container control supports the following selection types: o Single selection Single selection enables a user to select only one container item at a time. This is the default selection type for all views and is the only selection type supported for the tree view. o Extended selection Extended selection enables a user to select one or more container items, in any combination. The CUA-defined keyboard augmentation keys are implemented for extended selection. When used with a pointing device, these keys enable a user to select discontiguous sets of container items. Extended selection is valid for all views except the tree view. o Multiple selection Multiple selection enables a user to select none, some, or all of the container items. Multiple selection is valid for all views except the tree view. Only one of these selection types can be used for each container. The selection type for a container is defined when the container is created. These selection types conform to the guidelines in the SAA CUA Advanced Interface Design Reference. Refer to that book for detailed information. ΓòÉΓòÉΓòÉ 18.3.3.2. Selection Techniques ΓòÉΓòÉΓòÉ Depending on the type of view and the type of selection, a user can select container items using the following selection techniques: o Marquee selection Marquee selection is supported only in the icon view and is only valid with the extended and multiple selection types. This selection technique enables a user to begin selection from an anchor point that is established by moving the pointer to white space in the container and pressing, but not releasing, the select button on the pointing device. As the user presses the select button and drags the pointer, a tracking rectangle is drawn between the anchor point and the current pointer position. All items whose icons or bit maps are entirely within the tracking rectangle are dynamically selected. o Swipe selection Swipe selection is valid only with the extended and multiple selection types. The container control implements two techniques for swipe selection: touch swipe and range swipe. - Touch swipe Touch swipe selection is implemented in the icon view. With this selection technique, the pointer must pass over some portion of a container item while the user is pressing the select button for that item to be selected. - Range swipe In views other than the icon and tree views, range swipe selection is available. With this method, the user presses the select button while moving the pointer. However, the pointer does not have to pass directly over a container item for that item to be selected. Aside from pressing the select button and moving the pointer, the only other requirement for selection is that the container item must be within a range of items that is being selected. The range begins at the pointer's position when the user presses the select button; it ends at the pointer's position when the user releases the select button. Refer to the SAA CUA Advanced Interface Design Reference for complete information on touch swipe and range swipe selection. o First-letter selection For the icon, name, text, and tree views, first letter selection occurs when a character key is pressed, and the first container item whose text begins with that character is displayed with selected-state emphasis. The same is true for the details view, except that all the columns for a record are searched for a matching character before the next record is searched. The effect of first letter selection on other selected container items depends on the chosen selection type (single, multiple, or extended). All these selection techniques conform to the descriptions in the SAA CUA Guide to User Interface Design. Note: If more than one container window is open, selecting a container item in one window has no effect on the selections in any other window. ΓòÉΓòÉΓòÉ 18.3.3.3. Selection Mechanisms ΓòÉΓòÉΓòÉ The SAA CUA Guide to User Interface Design defines mouse button 1, the select button, to be used for selecting container items and mouse button 2, the drag button, to be used for dragging and dropping container items during direct manipulation. These definitions also apply to the same buttons on any other pointing device. In addition, a user can press a keyboard key while pressing a mouse button; this is called keyboard augmentation. The only instance of keyboard augmentation defined specifically for the container control is pressing the Alt key with the select button, which starts direct editing of text in a container. Refer to the SAA CUA Advanced Interface Design Reference for a complete list of the keys that are defined in the CUA guidelines for keyboard augmentation. In addition, the container control supports two keyboard cursors that can be moved by using keyboard navigation keys: o The selection cursor, a dotted black box drawn around a container item, which represents the current position for the purpose of keyboard navigation. o The text cursor, a vertical line that shows the user where text can be inserted or deleted when container text is being edited directly. Keyboard navigation consists of the use of the Up, Down, Left, and Right Arrow keys, the Home key, the End key, the PgUp (page up) key, and the PgDn (page down) key. If container items are not visible within the work area, navigation with these keys causes the items to scroll into view if the user is not editing container text directly. Refer to the SAA CUA Guide to User Interface Design for a description of the keyboard interface model. ΓòÉΓòÉΓòÉ 18.3.4. Providing Emphasis ΓòÉΓòÉΓòÉ The container control supports various types of emphasis. Emphasis is applied as described in the SAA CUA Guide to User Interface Design. Refer to that book for complete information about the use of emphasis. The following list describes forms of emphasis that have a distinct visible representation in the container control: o Selected-state emphasis When a container item is selected, the entire container item receives selected-state emphasis, which means that selected-state emphasis is applied to icon/text or bit-map/text pairs in the icon, name, tree icon, and tree name views; text strings in the text and tree text views; and an entire row that represents a container item in the details view. The following figure illustrates selected-state and unavailable-state emphasis; the emphasis on the choice in the pull-down menu indicates that the choice is unavailable. Selected-State and Unavailable-State Emphasis The color for selected-state emphasis can be changed by using the control panel, or the WinSetPresParam function, which results in a WM_PRESPARAMCHANGED message being sent to the container. See the WinSetPresParam function and WM_PRESPARAMCHANGED (in Container Controls) message in the OS/2 2.0 Programming Reference for more information. o In-use emphasis Cross-hatching behind an icon or bit map indicates in-use emphasis. In-use emphasis is not applied to container items in the text view, tree text view, or details view when it contains text only. However, the details view often includes icons or bit maps in one column of each record, usually the leftmost column. In this situation, specify the column that contains the icons or bit maps so that in-use emphasis can be applied to them. This column can be set by using the pFieldInfoObject field of the CNRINFO data structure. o Target emphasis Target emphasis is used during direct manipulation. When a user drags one container item over another, the item beneath the dragged item displays target emphasis. Two forms of target emphasis (visible feedback) are available: a black line and a black border. These forms of emphasis indicate the target, where the container item will be dropped if the user releases the drag button. The CA_ORDEREDTARGETEMPH and CA_MIXEDTARGETEMPH attributes of the CNRINFO data structure's flWindowAttr field determine the form of emphasis applied for the text, name, and details views, as follows: - If the CA_ORDEREDTARGETEMPH attribute is set: o The CN_DRAGAFTER notification code is sent when a container item is being dragged. o A black line is drawn between container items to show the current target position. - If the CA_MIXEDTARGETEMPH attribute is set: o The CN_DRAGAFTER and CN_DRAGOVER notification codes are sent when a container item is being dragged. The notification code sent depends on the position of the pointer relative to the item it is positioned over. o A black line is drawn if the pointer is positioned such that the item being dragged will be inserted between two target items. o A black border is drawn around either the entire target item for the text and details views or the icon or bit map for the name view if the pointer is positioned such that the item being dragged will be dropped on the target item. - If the CA_ORDEREDTARGETEMPH and CA_MIXEDTARGETEMPH attributes are not set: o The CN_DRAGOVER notification code is sent when a container item is being dragged. o A black border is drawn around the entire target item for the text and details views, and around the icon or bit map only for the name view. For the icon and tree view, the CA_ORDEREDTARGETEMPH and CA_MIXEDTARGETEMPH attributes are ignored, so target emphasis is applied as follows: - The CN_DRAGOVER notification code is sent when a container item is dragged. - A black border is drawn around the target, as follows: o For the icon view, if the target is another container item, a black border is drawn around the icon or bit map that represents the container item, but not around the text string beneath it. If the target is white space, a black border is drawn around the outer edge of the entire work area. o For the tree icon and tree name views, a black border is drawn around the icon or bit map that represents the container item, but not around the text string to the right of it. o For the tree text view, a black border is drawn around the entire target item. ΓòÉΓòÉΓòÉ 18.3.5. Using Direct Manipulation ΓòÉΓòÉΓòÉ Direct manipulation is a protocol that enables the user to drag a container item within its current window or from one window to another. The user can drop the container item either on white space in a window or on another item. Direct manipulation can be performed with all views of the container control. An API is provided so that the application is notified if an item is dropped on another item in the container and if an item is dragged from the container. The user can drag any container item, whether or not it is selected. If the user presses the drag button when the pointer is over a selected container item, the application drags all selected items. See Selection Techniques for information about the selection techniques. If the user presses the drag button when the pointer is over a container item that is not selected, the application drags only the item that the pointer is over. The container control fully supports direct manipulation. Refer to the SAA CUA Guide to User Interface Design for more information about the effects of direct manipulation. ΓòÉΓòÉΓòÉ 18.3.6. Specifying Space between Container Items ΓòÉΓòÉΓòÉ You can specify the amount of vertical space, in pels, to allow between container items by using the cyLineSpacing field of the CNRINFO data structure. If you do not specify how much vertical space can be used, the container control sets the space between the items using a default value. For the tree view, you can specify the horizontal distance between the levels by using the cxTreeIndent field of the CNRINFO data structure. If this value is less than 0, a default is used. ΓòÉΓòÉΓòÉ 18.4. Enhancing Container Control Performance ΓòÉΓòÉΓòÉ The following offers information about fine-tuning a container to enhance its performance and effectiveness: o Positioning container items o Specifying deltas for large amounts of data o Direct editing of text in a container o Specifying container titles o Specifying fonts and colors o Drawing container items and painting backgrounds o Filtering container items o Optimizing container memory usage o Sharing records among multiple containers. ΓòÉΓòÉΓòÉ 18.4.1. Positioning Container Items ΓòÉΓòÉΓòÉ Container items are positioned in the icon view according to workspace coordinates. The workspace is a two-dimensional Cartesian coordinate system. The user can see a portion of the workspace in the work area, which is the scrollable viewing area of the container that is defined by the size of the container window. The work area is logically scrollable within the workspace. The following figure shows the x- and y-axes of the workspace with a container window and its work area superimposed. (This figure is not drawn to scale.) ΓòÉΓòÉΓòÉ 18.4.1.1. Scrollable Workspace Areas ΓòÉΓòÉΓòÉ The following figure shows the scrollable area of the workspace, and thus the container. Workspace X- and Y-Axes This area is indicated by the solid black line that runs even with: o The top and bottom edges, respectively, of the topmost and bottommost container items o The left and right edges, respectively, of the leftmost and rightmost container items. The scrollable workspace area, then, is defined by the minimum and maximum x- and y-coordinates of the items in the container. That is, the work area of the container window can be scrolled only within the workspace and only as far as is necessary to see the topmost, bottommost, leftmost, and rightmost container items. The following figure further illustrates a bounded workspace. In this example, the topmost and bottommost container items limit the workspace. In the following figure, the work area has been scrolled so that all elements are not within the work area. The work area could be scrolled to the left so that it would include the leftmost element, or scrolled down and to the right to include the rightmost element, but it could not be scrolled any farther in either direction. ΓòÉΓòÉΓòÉ 18.4.1.2. Workspace and Work Area Origins ΓòÉΓòÉΓòÉ When the container is created, the work area and workspace share the same origin, (0,0), as represented in the previous figure. If the application requires that the work area and the workspace have different origins, the application can use the ptlOrigin field of the CNRINFO data structure and the CM_SETCNRINFO message to set the origin of the work area. The application could use the CM_QUERYCNRINFO and CM_SETCNRINFO messages to obtain the origin when the user ends the application, and reset it when the user restarts the application. Container items are located in reference to the workspace origin. There is a visual shift as the work area is scrolled; but because the work area moves over a fixed workspace, the coordinates of the container items do not change. Workspace Bounds ΓòÉΓòÉΓòÉ 18.4.2. Specifying Deltas for Large Amounts of Data ΓòÉΓòÉΓòÉ The container control can accommodate large amounts of data with an application-defined delta. The delta is an application-defined threshold, or number of container items, from either end of the list. The application is responsible for specifying the delta value in the CNRINFO data structure's cDelta field. It also is responsible for setting the delta value with the CMA_DELTA attribute of the CM_SETCNRINFO message's ulCnrInfoFl parameter. Refer to the OS/2 2.0 Programming Reference for description of CM_SETCNRINFO message. The container control monitors its place in the list of container items when the user is scrolling through it. When the user scrolls to the delta from either end of the list, the container control sends a CN_QUERYDELTA notification code to the application as a request for more container items in the list. The application is responsible for managing the records in the container. When the application receives the CN_QUERYDELTA notification code, the application is responsible for removing and inserting container records by using the CM_REMOVERECORD message and the CM_INSERTRECORD message respectively. Note: The delta concept is intended for applications with large amounts of data, or several thousand records. Applications with smaller amounts of data are not required to use the delta function. The default delta value is 0. The delta function is not available in the icon view because it is intended for data displayed in a linear format. ΓòÉΓòÉΓòÉ 18.4.3. Direct Editing of Text in a Container ΓòÉΓòÉΓòÉ Direct editing of text is supported for any text field in a container, including the container title, column headings, and container items. If a text field, such as the text field beneath an icon in the icon view, has no text and is not read-only, a user can place text in that field by editing the field directly. The font specified for the container by the application is used for the edited text. Direct editing is supported only for text data. Therefore, if the data type in the details view is other than CFA_STRING, a user cannot edit it. CFA_STRING is an attribute of the FIELDINFO data structure's flData field. You can prevent a user from editing any of the text in a container window by setting the CCS_READONLY style bit when a container is created. If you do not set this style bit, the user can edit any of the text in a container window unless you set the following read-only attributes: CA_TITLEREADONLY, CRA_RECORDREADONLY, CFA_FIREADONLY, and CFA_FITITLEREADONLY. If a read-only attribute is set, a user's attempts to edit container text directly are ignored. See the description of the CCS_READONLY style bit in the OS/2 2.0 Programming Reference for more information about these attributes. A user can edit container text directly by doing either of the following: o Moving the pointer to an editable text field, holding down the Alt key, and clicking the select button o Sending a CM_OPENEDIT message to the container control. The application can assign a key or menu choice to this message so that the keyboard can be used to edit container text directly. The container control responds by using the WM_CONTROL message to send the CN_BEGINEDIT notification code to the application. A window that contains a multiple-line entry (MLE) field opens to show that container text can be edited directly. The editing actions supported by MLEs, such as Cut, Copy, and Paste, are also supported by the container control. These actions can be performed using system-defined shortcut keys. The actions and shortcut keys are defined in the SAA CUA Advanced Interface Design Reference. If the user enters a text string that is longer than the text field, the text string scrolls. Also, if multiple lines of text are wanted, a user can press the Enter key and type on the following line whenever another line is needed. A user can end the direct editing of container text and save the changes by doing either of the following: o Moving the pointer outside the MLE and pressing the select button o Sending a CM_CLOSEEDIT message to the container control. The application can assign a key or menu choice to this message so that the keyboard can be used to end the direct editing of container text. The container responds by sending the WM_CONTROL message to the application again, but this time with the CN_REALLOCPSZ notification code. The application can allocate more memory on receipt of the CN_REALLOCPSZ notification code, if necessary. If the application returns TRUE, the container control copies the new text to the application's text string. If the application returns FALSE, the text change in the MLE is disregarded. The container then sends the WM_CONTROL message to the application again, this time with the CN_ENDEDIT notification code. The MLE field is removed from the screen, leaving only the text string. A user can end the direct editing of container text without saving any changes to the text in numerous ways, including the following: o Pressing the Esc key o Dragging the container item that is being edited o Pressing the Alt key and the select button before the direct editing of container text has ended o Scrolling the container window. The CN_ENDEDIT notification code is sent to the application in each of these cases. ΓòÉΓòÉΓòÉ 18.4.4. Specifying Container Titles ΓòÉΓòÉΓòÉ The container control can have a non-scrollable title that consists of one or more lines of text. The container control does not limit the number of lines or the number of characters in each line. If specified, this title is the first line or lines of the container control. The text of the title is determined by the application and can be used to identify the container or to contain status information. The following figure shows an example of a container title. Non-Flowed Text View with Container Title The CA_CONTAINERTITLE attribute must be set to include a title in a container window. The default is no container title. Split Details View with Container Title If you do not want the user to be able to edit the container title directly, you can set the CA_TITLEREADONLY attribute. The default is that the container title can be edited. See Direct Editing of Text in a Container for more information about editing container text directly. The CA_TITLESEPARATOR attribute must be set in order to include a separator line in a container window. The default is no separator line. The container titles in both figures are centered. This is the default. However, the CA_TITLECENTER, CA_TITLELEFT, or CA_TITLERIGHT attribute can be used to specify whether a container title is to be centered, left-justified, or right-justified, respectively. All the container attributes described here are attributes of the CNRINFO data structure's flWindowAttr field. ΓòÉΓòÉΓòÉ 18.4.5. Specifying Fonts and Colors ΓòÉΓòÉΓòÉ A different font can be specified for each view. The same font is used for the text within each view. Text color can be configured from the system control panel. The application can override the system-defined font and colors by using the WinSetPresParam function. The font and color can be changed for the text in all views. However, font and color cannot be changed for text in individual columns in the details view. Therefore, all text in the details view, including the container title, columns, and column headings, has the same font and color. ΓòÉΓòÉΓòÉ 18.4.6. Drawing Container Items and Painting Backgrounds ΓòÉΓòÉΓòÉ The container control enables your application to paint the container's background, draw the container items, or both. If the CA_OWNERPAINTBACKGROUND attribute is set, the container control sends the CM_PAINTBACKGROUND message to itself. Your application can control background painting by subclassing the container control and intercepting the CM_PAINTBACKGROUND message. CA_OWNERPAINTBACKGROUND is an attribute of the CNRINFO data structure's flWindowAttr field. To support ownerdraw, the drawing of container items by the application, the container control provides the CA_OWNERDRAW attribute of the CNRINFO data structure's flWindowAttr field. If this attribute is set and the application processes the WM_DRAWITEM window message, the application is responsible for drawing each container item, including the types of emphasis. In addition, the container control supports ownerdraw for each column in the details view. This support is indicated by the CFA_OWNER attribute, which is specified in the FIELDINFO data structure's flData field. If the CA_OWNERDRAW attribute or CFA_OWNER attribute is set, the container control sends the application a WM_DRAWITEM message with a pointer to an OWNERITEM data structure as the owneritem parameter. Refer to the OS/2 2.0 Programming Reference for a description of the OWNERITEM data structure fields as they apply to the container control. ΓòÉΓòÉΓòÉ 18.4.7. Filtering Container Items ΓòÉΓòÉΓòÉ If the CRA_FILTERED attribute is set for a container item, that item is not displayed. Therefore, filtering can be used to hide container items. CRA_FILTERED is an attribute of the RECORDCORE data structure's flRecordAttr field. ΓòÉΓòÉΓòÉ 18.4.8. Optimizing Container Memory Usage ΓòÉΓòÉΓòÉ The container control provides an option to enable you to develop applications that minimize the amount of memory used for each container record. This is done by specifying the CCS_MINIRECORDCORE style bit when the container is created, which causes a smaller version of the RECORDCORE data structure, MINIRECORDCORE, to be used. The following table shows the differences between these two data structures. Differences between RECORDCORE and MINIRECORDCORE ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéRECORDCORE ΓöéMINIRECORDCORE Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéUp to eight image handles can ΓöéOnly one image handle can be Γöé Γöébe specified for each record. Γöéspecified for each record. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ Γöé ΓöéNote: This image must be an Γöé Γöé Γöéicon. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéUp to four text strings can beΓöéOnly one text string can be Γöé Γöéspecified for each record. Γöéspecified for each record. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 18.4.8.1. Allocating Memory for Container Records When Using MINIRECORDCORE ΓòÉΓòÉΓòÉ The sample code in the following figure shows how to allocate memory for one container record when the MINIRECORDCORE data structure is used. A pointer to the MINIRECORDCORE structure is returned. Sample Code for Allocating Memory for Smaller Container Records HWND hwndCnr; /* Container window handle */ PRECORDCORE pRecord; /* Pointer to RECORDCORE structure */ ULONG nRecords = 1; /* 1 record to be allocated */ pRecord = (PMINIRECORDCORE)WinSendMsg( hwndCnr, /* Container window handle */ CM_ALLOCRECORD, /* Message for allocating the record */ NULL, /* No additional memory */ (MPARAM)nRecords); /* Number of records to be allocated */ ΓòÉΓòÉΓòÉ 18.4.8.2. Sharing Records Among Multiple Containers ΓòÉΓòÉΓòÉ The container control enables the application to share records that are allocated among multiple containers in the same process. That is, records can be allocated once and then inserted into many containers in the same process. Only one copy of each record is in memory, but the container provides the flexibility for the records to appear as though they are independent of one another. When a record is inserted into the container, the flRecordAttr and ptlIcon fields of the record structure are saved internally. The values in these fields cause the record attributes for all views and the icon position for the icon view to be associated with the specific container into which the record is inserted. If the same record is inserted into multiple containers, the attributes and icon location of each record are maintained separately. The application uses the CM_QUERYRECORDINFO message to retrieve the current values of these two fields for a particular record in a specific container. ΓòÉΓòÉΓòÉ 18.4.8.3. Invalidating Records Shared by Multiple Containers ΓòÉΓòÉΓòÉ When a record is invalidated by an application, the flRecordAttr and ptlIcon fields are saved internally, just as when a record is inserted. Therefore, use the CM_QUERYRECORDINFO message to acquire the current data for each record that is being invalidated. After querying the current data, you can change any of this data before invalidating its record. ΓòÉΓòÉΓòÉ 18.4.8.4. Freeing Records Shared by Multiple Containers ΓòÉΓòÉΓòÉ When an application attempts to free a record in an open container, the record is freed only if it is not being used in any other open container. The methods of freeing records in an open container are to use the CM_FREERECORD message, or use the CM_REMOVERECORD message and specify the CMA_FREE attribute. ΓòÉΓòÉΓòÉ 18.5. Summary ΓòÉΓòÉΓòÉ Following are tables that describe the OS/2 container control structures, notification codes, notification messages, and window messages: Container Control Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCDATE ΓöéContains date information for a dataΓöé Γöé Γöéelement in the details view of the Γöé Γöé Γöécontainer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCNRDRAGINFO ΓöéContains information about a direct Γöé Γöé Γöémanipulation event occurring over Γöé Γöé Γöéthe container. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCNRDRAGINIT ΓöéContains information about a direct Γöé Γöé Γöémanipulation event that was Γöé Γöé Γöéinitiated in a container. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCNRDRAWITEMINFO ΓöéContains information about the item Γöé Γöé Γöébeing drawn in the container. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCNREDITDATA ΓöéContains information about the Γöé Γöé Γöédirect editing of container text. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCNRINFO ΓöéContains information about the Γöé Γöé Γöécontainer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCTIME ΓöéContains time information for a dataΓöé Γöé Γöéelement in the details view of the Γöé Γöé Γöécontainer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFIELDINFO ΓöéContains information about column Γöé Γöé Γöédata in the details view of the Γöé Γöé Γöécontainer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFIELDINFOINSERT ΓöéContains information about the Γöé Γöé ΓöéFIELDINFO structure or structures Γöé Γöé Γöéthat are being inserted into the Γöé Γöé Γöécontainer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéMINIRECORDCORE ΓöéContains information for container Γöé Γöé Γöérecords that are smaller than those Γöé Γöé Γöédefined by the RECORDCORE structure.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéNOTIFYDELTA ΓöéContains information about the Γöé Γöé Γöéplacement of delta information for Γöé Γöé Γöéthe container. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéNOTIFYRECORDEMPHASIS ΓöéContains information about the Γöé Γöé Γöéemphasis applied to a container Γöé Γöé Γöérecord. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéNOTIFYRECORDENTER ΓöéContains information about the inputΓöé Γöé Γöédevice being used with the Γöé Γöé Γöécontainer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéNOTIFYSCROLL ΓöéContains information about scrollingΓöé Γöé Γöéthe container window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéOWNERBACKGROUND ΓöéContains information about painting Γöé Γöé Γöéthe container window's background. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéQUERYRECFROMRECT ΓöéContains information about a Γöé Γöé Γöécontainer record that is bounded by Γöé Γöé Γöéa specified rectangle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéQUERYRECORDRECT ΓöéContains information about the Γöé Γöé Γöérectangle that bounds a specified Γöé Γöé Γöécontainer record. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRECORDCORE ΓöéContains information for container Γöé Γöé Γöérecords. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRECORDINSERT ΓöéContains information about the Γöé Γöé ΓöéRECORDCORE structure or structures Γöé Γöé Γöéthat are being inserted into the Γöé Γöé Γöécontainer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSEARCHSTRING ΓöéContains information about the Γöé Γöé Γöécontainer text string that is the Γöé Γöé Γöéobject of the search. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTREEITEMDESC ΓöéContains icons and bit maps used to Γöé Γöé Γöérepresent the state of an expanded Γöé Γöé Γöéor collapsed parent item in the treeΓöé Γöé Γöéname view. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Container Control Notification Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_BEGINEDIT ΓöéSent when container text is about toΓöé Γöé Γöébe edited. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_COLLAPSETREE ΓöéSent when a parent item is collapsedΓöé Γöé Γöéin the tree view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_CONTEXTMENU ΓöéSent when the container receives a Γöé Γöé ΓöéWM_CONTEXTMENU message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_DRAGAFTER ΓöéSent when the container receives a Γöé Γöé ΓöéDM_DRAGOVER message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_DRAGLEAVE ΓöéSent when the container receives a Γöé Γöé ΓöéDM_DRAGLEAVE message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_DRAGOVER ΓöéSent when the container receives a Γöé Γöé ΓöéDM_DRAGOVER message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_DROP ΓöéSent when the container receives a Γöé Γöé ΓöéDM_DROP message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_DROPHELP ΓöéSent when the container receives a Γöé Γöé ΓöéDM_DROPHELP message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_EMPHASIS ΓöéSent when the attributes of a Γöé Γöé Γöécontainer record change. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_ENDEDIT ΓöéSent when direct editing of the Γöé Γöé Γöécontainer text ends. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_ENTER ΓöéSent either when the Enter key is Γöé Γöé Γöépressed while the container window Γöé Γöé Γöéhas the focus, or when the select Γöé Γöé Γöébutton is double-clicked while the Γöé Γöé Γöépointer is over the container Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_EXPANDTREE ΓöéSent when the container expands a Γöé Γöé Γöéparent item in the tree view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_HELP ΓöéSent when the container receives a Γöé Γöé ΓöéWM_HELP message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_INITDRAG ΓöéSent when the drag button is pressedΓöé Γöé Γöéand the pointer is moved while over Γöé Γöé Γöéthe container control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_KILLFOCUS ΓöéSent when the container is losing Γöé Γöé Γöéthe focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_QUERYDELTA ΓöéSent to query for more data when theΓöé Γöé Γöéuser scrolls to a preset delta Γöé Γöé Γöévalue. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_REALLOCPSZ ΓöéSent when container text is edited Γöé Γöé Γöé(before CN_ENDEDIT is sent). Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_SCROLL ΓöéSent when the container window Γöé Γöé Γöéscrolls. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCN_SETFOCUS ΓöéSent when the container receives theΓöé Γöé Γöéfocus. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Container Control Notification Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when the container control Γöé Γöé Γöéhas a significant event to notify toΓöé Γöé Γöéits owner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to the container control's Γöé Γöé Γöéowner window when the pointing Γöé Γöé Γöédevice pointer moves over the Γöé Γöé Γöécontainer window, allowing the ownerΓöé Γöé Γöéto set the pointing device pointer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DRAWITEM ΓöéSent to the owner of the container Γöé Γöé Γöécontrol each time an item is to be Γöé Γöé Γöédrawn. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Container Control Window Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_ALLOCDETAILFIELDINFO ΓöéAllocates memory for one or Γöé Γöé Γöémore FIELDINFO structures. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_ALLOCRECORD ΓöéAllocates memory for one or Γöé Γöé Γöémore RECORDCORE structures. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_ARRANGE ΓöéArranges the container recordsΓöé Γöé Γöéin the icon view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_CLOSEEDIT ΓöéCloses the window containing Γöé Γöé Γöéthe multiple-line entry (MLE) Γöé Γöé Γöéfield used to edit container Γöé Γöé Γöétext directly. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_COLLAPSETREE ΓöéCauses one parent item in the Γöé Γöé Γöétree view to be collapsed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_ERASERECORD ΓöéErases the source record from Γöé Γöé Γöéthe current view when a move Γöé Γöé Γöéoccurs as a result of direct Γöé Γöé Γöémanipulation. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_EXPANDTREE ΓöéCauses one parent item in the Γöé Γöé Γöétree view to be expanded. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_FILTER ΓöéFilters the contents of a Γöé Γöé Γöécontainer so that a subset of Γöé Γöé Γöéthe container items can be Γöé Γöé Γöéviewed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_FREEDETAILFIELDINFO ΓöéFrees the memory associated Γöé Γöé Γöéwith one or more FIELDINFO Γöé Γöé Γöéstructures. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_FREERECORD ΓöéFrees the memory associated Γöé Γöé Γöéwith one or more RECORDCORE Γöé Γöé Γöéstructures. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_HORZSCROLLSPLITWINDOW ΓöéScrolls a split window in the Γöé Γöé Γöésplit details view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_INSERTDETAILFIELDINFO ΓöéInserts one or more FIELDINFO Γöé Γöé Γöéstructures into a container Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_INSERTRECORD ΓöéInserts one or more RECORDCOREΓöé Γöé Γöéstructures into a container Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_INVALIDATEDETAILFIELDINFO ΓöéNotifies the container controlΓöé Γöé Γöéthat any or all FIELDINFO Γöé Γöé Γöéstructures are not valid and Γöé Γöé Γöéthat the view must be Γöé Γöé Γöérefreshed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_INVALIDATERECORD ΓöéNotifies the container controlΓöé Γöé Γöéthat any or all RECORDCORE Γöé Γöé Γöéstructures are not valid and Γöé Γöé Γöémust be refreshed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_OPENEDIT ΓöéOpens the window that containsΓöé Γöé Γöéthe multiple-line entry (MLE) Γöé Γöé Γöéfield used to edit container Γöé Γöé Γöétext directly. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_PAINTBACKGROUND ΓöéInforms an application when a Γöé Γöé Γöécontainer's background is Γöé Γöé Γöépainted if the Γöé Γöé ΓöéCA_OWNERPAINTBACKGROUND Γöé Γöé Γöéattribute of the CNRINFO data Γöé Γöé Γöéstructure is specified. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYCNRINFO ΓöéReturns the container's Γöé Γöé ΓöéCNRINFO structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYDETAILFIELDINFO ΓöéReturns a pointer to the Γöé Γöé Γöérequested FIELDINFO structure.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYDRAGIMAGE ΓöéReturns a handle to the icon Γöé Γöé Γöéor bit map for the record in Γöé Γöé Γöéthe current view. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYRECORD ΓöéReturns a pointer to the Γöé Γöé Γöérequested RECORDCORE Γöé Γöé Γöéstructure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYRECORDEMPHASIS ΓöéQueries for a container recordΓöé Γöé Γöéwith the specified emphasis Γöé Γöé Γöéattributes. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYRECORDFROMRECT ΓöéQueries for a container recordΓöé Γöé Γöéthat is bounded by the Γöé Γöé Γöéspecified rectangle. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYRECORDINFO ΓöéUpdates the specified records Γöé Γöé Γöéwith the current information Γöé Γöé Γöéfor the container. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYRECORDRECT ΓöéReturns the rectangle of the Γöé Γöé Γöéspecified container record, Γöé Γöé Γöérelative to the container Γöé Γöé Γöéwindow origin. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_QUERYVIEWPORTRECT ΓöéReturns a rectangle that Γöé Γöé Γöécontains the coordinates of Γöé Γöé Γöéthe container's work area. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_REMOVEDETAILFIELDINFO ΓöéRemoves one, multiple, or all Γöé Γöé ΓöéFIELDINFO structures from the Γöé Γöé Γöécontainer control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_REMOVERECORD ΓöéRemoves one, multiple, or all Γöé Γöé ΓöéRECORDCORE structures from theΓöé Γöé Γöécontainer control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_SCROLLWINDOW ΓöéScrolls an entire container Γöé Γöé Γöéwindow. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_SEARCHSTRING ΓöéReturns the pointer to a Γöé Γöé Γöécontainer record whose text Γöé Γöé Γöématches the string. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_SETCNRINFO ΓöéSets or changes the data for Γöé Γöé Γöéthe container control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_SETRECORDEMPHASIS ΓöéSets the emphasis attributes Γöé Γöé Γöéof the specified container Γöé Γöé Γöérecord. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCM_SORTRECORD ΓöéSorts the container records inΓöé Γöé Γöéthe container control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PRESPARAMCHANGED ΓöéSent when a presentation Γöé Γöé Γöéparameter is set or removed Γöé Γöé Γöédynamically from a window Γöé Γöé Γöéinstance. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 19. Notebook Controls ΓòÉΓòÉΓòÉ A notebook control (WC_NOTEBOOK window class) is a visual component that organizes information on individual pages so that a user can find and display that information quickly and easily. This chapter explains how to use notebook controls in PM applications. ΓòÉΓòÉΓòÉ 19.1. About Notebook Controls ΓòÉΓòÉΓòÉ This notebook control component simulates a real notebook, but improves on it by overcoming a notebook's natural limitations. A user can select and display pages by using a pointing device or the keyboard. Notebook Example The notebook can be customized to meet varying application requirements, while providing a user interface component that can be used easily to develop products that conform to the Common User Access (CUA) user interface guidelines. The application can specify different colors, sizes, and orientations for its notebooks, but the underlying function of the control remains the same. For a complete description of CUA notebooks, refer to the SAA CUA Guide to User Interface Design and the SAA CUA Advanced Interface Design Reference. ΓòÉΓòÉΓòÉ 19.1.1. Notebook Creation ΓòÉΓòÉΓòÉ You create a notebook by using the WC_NOTEBOOK window class name in the ClassName parameter of the WinCreateWindow function. The following figure shows the creation of the notebook. The style set in the ulNotebookStyles variable (the BKS_* values) specifies that the notebook is to be created with a solid binding and the back pages intersecting at the bottom right corner, major tabs placed on the right edge, tab type square, tab text centered, and status text left-justified. These are the default settings and are given here only to show how notebook styles are set. Sample Code for Creating a Notebook HWND hwndNotebook; /* Notebook window handle */ ULONG ulNotebookStyles; /* Notebook window styles */ HMODULE hmod; /* Notebook DLL module handle */ /**********************************************************************/ /* Set the BKS_style flags to customize the notebook. */ /**********************************************************************/ ulNotebookStyles = BKS_SOLIDBIND | /* Use solid binding. */ BKS_BACKPAGESBR | /* Set back pages to intersect at the */ /* bottom right corner. */ BKS_MAJORTABRIGHT | /* Position major tabs on right side. */ BKS_SQUARETABS | /* Make the tabs square. */ BKS_TABTEXTCENTER | /* Center tab text. */ BKS_STATUSTEXTLEFT; /* Align status line text left. */ /**********************************************************************/ /* Create the notebook control window. */ /**********************************************************************/ hwndNotebook = WinCreateWindow( hwndParent, /* Parent window handle */ WC_NOTEBOOK, /* Notebook window class */ NULL, /* No window text */ ulNotebookStyles, /* Notebook window styles */ x, y, cx, xy /* Origin and size */ hwndOwner, /* Owner window handle */ HWND_TOP, /* Sibling window handle */ ID_BOOK, /* Notebook window ID */ NULL, /* No control data */ NULL; /* No presentation parameters */ /**********************************************************************/ /* Make the notebook control visible. */ /**********************************************************************/ WinShowWindow( hwndNotebook, /* Notebook window handle */ TRUE); /* Make the window visible. */ ΓòÉΓòÉΓòÉ 19.1.2. Understanding the Default Notebook Style ΓòÉΓòÉΓòÉ As specified in the preceding sample code, the following figure shows how the default notebook control looks when it is created. Default Notebook Style The notebook control resembles a real notebook in its general appearance. For example, as the previous figure shows, the notebook has a binding that, along with recessed pages on the right and bottom edges, gives the notebook a three-dimensional appearance. The default binding is solid and is placed on the left side. This binding is used if no style bit is specified or if the BKS_SOLIDBIND style bit is specified. In the bottom right corner of the notebook in the previous figure are the page buttons. These buttons are for bringing one page of the notebook into view at a time. They are a standard component that is automatically provided with every notebook. However, the application can change the default width and height of the page buttons by using the BKM_SETDIMENSIONS message. Selecting the forward page button (the arrow pointing to the right) causes the next page to be displayed; while selecting the backward page button (the arrow pointing to the left) causes the previous page to be displayed. In the previous figure, the page buttons are displayed with unavailable-state emphasis because no pages have been inserted in the notebook yet. Therefore, in this example, selecting either page button would not bring a page into view. To the left of the page buttons in the default notebook style setting is the status line, which enables the application to provide information to the user about the page currently displayed. The notebook does not supply any default text for the status line. The application is responsible for associating a text string with the status line of each page on which a text string is to be displayed. The procedure for associating a text string with a status line is described in Inserting Notebook Pages. Text displayed in the status line is left-justified by default. This setting is specified by the BKS_STATUSTEXTLEFT style bit. See Notebook Control Styles for information about other style bits that can be set for the notebook. The page buttons always are located in the corner where the recessed edges of the notebook intersect. These recessed edges are called the back pages. The default notebook's back pages intersect in the bottom right corner, which means the recessed pages are on the bottom and right edges. This setting is specified by the BKS_BACKPAGESBR style bit. The back pages are important because their intersection determines where the major tabs can be placed, which in turn determines the placement of the binding and the minor tabs. Major and minor tabs are used to organize related pages into sections; minor tabs define subsections within major tab sections. The content of each section has a common theme, which is represented to the user by a tabbed divider, similar to a tabbed page in a notebook. In the figure, the BKS_MAJORTABRIGHT style bit specifies that major tabs, if used, are to be placed on the right side of the notebook. This is the default major tab placement when the back pages intersect at the bottom right corner of the notebook. The binding is located on the left, because it is always located on the opposite side of the notebook from the major tabs. The default notebook has no major tabs, even though the BKS_MAJORTABRIGHT style bit was specified, because major tab attributes, if desired, can be specified only at the time a page is inserted in the notebook. This is done by specifying the BKA_MAJOR attribute in the BKM_INSERTPAGE message. Similarly, minor tabs are specified using the BKA_MINOR attribute. Minor tabs always are placed perpendicular to the major tabs, based on the intersection of the back pages and the major tab placement. Only one major or minor tab attribute can be specified for each notebook page. Minor tabs are displayed only if the associated major tab page is selected or if the notebook has no major tab pages. The following figure is an example of a notebook for which both major and minor tab attributes were specified. Default Style and Placement of Major and Minor Tabs The default shape of the tabs used on notebook divider pages is square. This setting is specified by the BKS_SQUARETABS style bit. As with the page buttons, the application can change the default width and height of the major and minor tabs by using the BKM_SETDIMENSIONS message. A notebook tab can contain either text or a bit map. Text is placed on a tab by using the BKM_TABTEXTCENTER style bit. A bit map is placed on a tab by using the BKM_SETTABBITMAP message. A bit map cannot be positioned on a tab because the bit map stretches to fill the rectangular area of the tab; therefore, no style bit is used. The following paragraphs provide details about changing notebook style settings, along with additional information about the effect of the back pages intersection on notebook style. ΓòÉΓòÉΓòÉ 19.1.3. Notebook Control Styles ΓòÉΓòÉΓòÉ The notebook control provides style bits so that your application can specify or change the default style settings described in Understanding the Default Notebook Style. One style bit from each of the following groups can be specified: o Type of binding BKS_SOLIDBIND Solid (default). BKS_SPIRALBIND Spiral. o Intersection of back pages BKS_BACKPAGESBR Bottom right corner (default). BKS_BACKPAGESBL Bottom left corner. BKS_BACKPAGESTR Top right corner. BKS_BACKPAGESTL Top left corner. o Location of major tabs BKS_MAJORTABRIGHT Right edge (default). BKS_MAJORTABLEFT Left edge. BKS_MAJORTABTOP Top edge. BKS_MAJORTABBOTTOM Bottom edge. o Shape of tabs BKS_SQUARETABS Square (default). BKS_ROUNDEDTABS Rounded. BKS_POLYGONTABS Polygonal. o Alignment of text associated with tabs BKS_TABTEXTCENTER Centered (default). BKS_TABTEXTLEFT Left-justified. BKS_TABTEXTRIGHT Right-justified. o Alignment of status line text. BKS_STATUSTEXTLEFT Left-justified (default). BKS_STATUSTEXTRIGHT Right-justified. BKS_STATUSTEXTCENTER Centered. If you specify more than one style bit, you must use an OR operator (|) to combine them. See the OS/2 2.0 Programming Reference for definitions of the notebook style bits. Two styles are provided for the notebook binding: solid and spiral. The notebook is displayed with a solid binding by default, but the application can specify BKS_SPIRALBIND to display a spiral binding. The most important of the style bits are those that determine the corner at which the back pages intersect and those that indicate the side where the major tabs are to be placed. For example, if the application specifies the back pages intersection at the bottom right corner (BKS_BACKPAGESBR, the default), the major tabs can be placed on either the bottom edge (BKS_MAJORTABBOTTOM) or the right edge (BKS_MAJORTABRIGHT) of the notebook. In this situation, if the application specifies that major tabs are to be placed on the left or top edges of the notebook, the notebook control places them on the right edge anyway-the default placement for back pages intersecting at the bottom right corner. The placement of the minor tabs and binding depends entirely on the placement of the back pages and major tabs respectively. The binding always is located on the side of the notebook opposite the side where the major tabs are. The minor tabs always are located on the recessed page side that has no major tabs. The following table describes the available notebook window style settings. Notebook Window Style Settings ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéBack Pages ΓöéMajor Tabs ΓöéMinor Tabs ΓöéBinding Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBottom right (default)ΓöéBottom ΓöéRight ΓöéTop Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBottom right (default)ΓöéRight (default) ΓöéBottom ΓöéLeft Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBottom left ΓöéBottom (default) ΓöéLeft ΓöéTop Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBottom left ΓöéLeft ΓöéBottom ΓöéRight Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTop right ΓöéTop (default) ΓöéRight ΓöéBottom Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTop right ΓöéRight ΓöéTop ΓöéLeft Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTop left ΓöéTop ΓöéLeft ΓöéBottom Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéTop left ΓöéLeft (default) ΓöéTop ΓöéRight Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ The shape of the tabs can be square, rounded, or polygonal. The tab text can be drawn left-justified, right justified, or centered. Once set, these styles apply to the major and minor tabs for all the pages in the notebook. Text is associated with a tab page by using the BKM_SETTABTEXT message. Notebook tab text is centered by default or by specifying the BKS_TABTEXTCENTER style when creating the notebook window. The application can associate status line text with each inserted notebook page. The status text is drawn left-justified by default, but also can be drawn centered or right-justified. The same status text justification applies to all pages in the notebook. The location of the back pages intersection and the major tabs has no effect on the specification of the tab shape and status line position. These style bits can be set for the entire notebook. The following figure shows some sample code for setting the notebook style to spiral binding, back pages that intersect at the bottom left corner, major tabs on the bottom edge, rounded tabs, tab text left justified, and status line text centered. Sample Code for Changing the Notebook Style /**********************************************************************/ /* Query for the existing notebook window style settings */ /**********************************************************************/ ulNotebookStyles = WinQueryWindowULong( hwndNotebook, /* Notebook window handle */ QWL_STYLE ); /* Set notebook style */ /**********************************************************************/ /* Reset notebook window style flags, leaving window flags unchanged. */ /**********************************************************************/ ulNotebookStyles &= 0xFFFF0000; /**********************************************************************/ /* Set up the new notebook window style flags */ /**********************************************************************/ ulNotebookStyles |= BKS_SPIRALBIND | /* Use spiral binding. */ BKS_BACKPAGESBL | /* Set back pages to intersect at the */ /* bottom left corner. */ BKS_MAJORTABBOTTOM | /* Position major tabs on bottom edge. */ BKS_ROUNDEDTABS | /* Make tabs rounded. */ BKS_TABTEXTLEFT | /* Make tab text left justified. */ BKS_STATUSTEXTCENTER; /* Center status text. */ /**********************************************************************/ /* Set the new notebook style. */ /**********************************************************************/ WinSetWindowULong( hwndNotebook, /* Notebook window handle */ QWL_STYLE, /* Window style */ ulNotebookStyles); /* Set notebook style. */ /**********************************************************************/ /* Invalidate to force a repaint. */ /**********************************************************************/ WinInvalidateRectl( hwndNotebook, /* Notebook window handle */ NULL, /* Invalidate entire window, */ TRUE); /* including children. */ The following figure shows how the notebook appears when these style bits are set. This figure assumes that pages have been inserted in the notebook with major and minor tab attributes. Notebook with Style Settings Changed ΓòÉΓòÉΓòÉ 19.2. Working with Notebook Pages and Windows ΓòÉΓòÉΓòÉ The following sections tell you how to insert information in, create and associate windows for, and remove information from a notebook. ΓòÉΓòÉΓòÉ 19.2.1. Inserting Notebook Pages ΓòÉΓòÉΓòÉ After a notebook is created, pages can be inserted in the notebook by using the BKM_INSERTPAGE message. BKM_INSERTPAGE provides several attributes that can affect the inserted pages. When inserting pages into either a new notebook or an existing one, carefully consider how the user will expect those pages to be organized. The two attributes that have the most impact on how notebook pages are organized are BKA_MAJOR and BKA_MINOR, which specify major and minor tabs respectively. Major tab pages define the beginning of major sections in the notebook, while minor tab pages define the beginning of subsections within a major section. Major sections should begin with a page that has a BKA_MAJOR attribute. Within major sections, information can be organized into minor sections, each of which should begin with a page that has a BKA_MINOR attribute. For an existing notebook, the underlying hierarchy, if one exists, must be observed when inserting new pages, to provide efficient organization and navigation of the information in the notebook. For example, if the notebook has minor sections but no major sections, you could confuse the user if you inserted a page with a major tab attribute between related minor sections or at the end of the notebook. If you insert pages without specifying tab attributes, those pages become part of the section in which they are inserted. For example, if page 7 of your notebook has a minor tab, and you insert a new page 8 without specifying a tab attribute, page 8 becomes part of the section that begins with the minor tab on page 7. Since tab pages are not mandatory, the application can create a notebook that contains no major or minor tab pages. That style would be similar to that of a composition notebook. Another group of attributes that can affect the organization of pages being inserted into a notebook consists of BKA_LAST, BKA_FIRST, BKA_NEXT, and BKA_PREV. These attributes cause pages to be inserted at the end, at the beginning, after a specified page, and before a specified page of a notebook, respectively. Each page has an optional status line that can be used to display information for the user. To include this status line, the application must specify the BKA_STATUSTEXTON attribute when inserting the page. If the application inserts the page without specifying this attribute, the status line is not available for that page. To display text on the status line of the specified page, the application must use the BKM_SETSTATUSLINETEXT message to associate a text string with the page. A separate message must be sent for each page that is to display status line text. If the application does not send a BKM_SETSTATUSLINETEXT message for a page, no text is displayed in the status line of that page. The application can send this message to the notebook at any time to change the status line text. The status line can be cleared by setting the text to NULL. The following figure shows how to insert a page in a notebook, where the inserted page has a major tab attribute, the status line is available, and the page is inserted after the last page in the notebook. This sample code also shows how to associate a text string with the status line of the inserted page. Sample Code for Inserting a Notebook Page HWND hwndNotebook; /* Notebook window handle */ ULONG ulPageId; /* Page identifier */ /**********************************************************************/ /* Insert a new page into a notebook */ /**********************************************************************/ ulPageId = (ULONG) WinSendMsg( hwndNotebook, /* Notebook window handle */ BKM_INSERTPAGE, /* Message for inserting a page */ (MPARAM)NULL, /* NULL for page ID */ MPFROM2SHORT( BKA_MAJOR | /* Insert page with a major tab */ /* attribute */ BKA_STATUSTEXTON), /* Make status line text visible */ BKA_LAST)); /* Insert this page at end of notebook */ /**********************************************************************/ /* Set the status line text. */ /**********************************************************************/ WinSendMsg( hwndNotebook, /* Notebook window handle */ BKM_SETSTATUSLINETEXT, /* Message for setting status line */ /* text */ (MPARAM)ulPageId, /* ID of page to receive status line */ /* text */ MPFROMP("Page 1 of 2"); /* Text string to put on status line */ ΓòÉΓòÉΓòÉ 19.2.2. Associating Application Page Windows with Notebook Pages ΓòÉΓòÉΓòÉ After a page is inserted into a notebook, you must facilitate the display of information for this page when it is brought to the top of the book. The notebook provides a top page area in which the application can display windows or dialogs for the topmost page. For each inserted page, the application must associate the handle of a window or dialog that is to be invalidated when the page is brought to the top of the book. The application can associate the same handle with different pages if desired. The application must send a BKM_SETPAGEWINDOWHWND message to the notebook order to associate the application page window or dialog handle with the notebook page being inserted. Once done, the notebook invalidates this window or dialog whenever the notebook page is brought to the top of the book. If no application page window handle is specified for an inserted page, no invalidation can be done by the notebook for that page. However, the application will receive a BKN_PAGESELECTED notification code when a new page is brought to the top of the notebook, at which time the application can invalidate the page. ΓòÉΓòÉΓòÉ 19.2.2.1. Associating a Window or Dialog with a Notebook Page ΓòÉΓòÉΓòÉ The following sections describe how to associate either a window handle or a dialog handle with an inserted page. ΓòÉΓòÉΓòÉ 19.2.2.1.1. Associating a Window with a Notebook Page ΓòÉΓòÉΓòÉ A calendar example is used to show how a page can be implemented as a window. The following figure shows a calendar that is divided into four years (major tabs). Within each year are months (minor tabs,) grouped into quarters. The top page has a window associated with it. The window paint processing displays the days for the currently selected month and year. Calendar Inserted into an Application Page Window The sample code in the following figure shows how the window procedure for the calendar is registered with the application. Also, it shows how the window is created and associated with the notebook page. The example ends by showing the window procedure for the associated window. SampleCodeforAssociatingaWindowwithaNotebookPage /********************************************************************/ /* Registration of window procedure for calendar. */ /********************************************************************/ WinRegisterClass(hab, /* Register a page window class */ "Calendar Page", /* Class name */ PageWndProc, /* Window procedure */ CS_SIZEREDRAW, /* Class style */ 0); /* No extra bytes reserved */ /********************************************************************/ /* Create the window. */ /********************************************************************/ hwndPage = WinCreateWindow(hwndNotebook, /* Parent */ "Calendar Page", /* Class */ NULL, /* Title text */ 0L, /* Style */ 0, 0, 0, 0, /* Origin and size */ hwndNotebook, /* Owner */ HWND_TOP, /* Z-order */ ID_WIN_CALENDAR_PAGE, /* ID */ NULL, /* Control data */ NULL); /* Pres params */ /********************************************************************/ /* Associate window with the inserted notebook page. */ /********************************************************************/ WinSendMsg(hwndBook, BKM_SETPAGEWINDOWHWND, MPFROMLONG(ulPageId), MPFROMHWND(hwndPage)); /********************************************************************/ /* Window procedure. */ /********************************************************************/ MRESULT EXPENTRY PageWndProc(HWND hwnd,USHORT msg,MPARAM mp1, MPARAM mp2) { HPS hps; switch (msg) { /******************************************************************/ /* WM_CREATE is sent when the window is created. */ /******************************************************************/ case WM_CREATE : /****************************************************************/ /* Place window initialization code here */ /****************************************************************/ break; case WM_PAINT : /****************************************************************/ /* Draw the calendar for the current selected year and month */ /****************************************************************/ hps = WinBeginPaint(hwnd, NULL, NULL); drawMonthCalendar(hps, windowSize, currDate.year, currDate.month); WinEndPaint(hps); break; default: return (WinDefWindowProc(hwnd, msg, mp1, mp2)); break; } return (FALSE); } ΓòÉΓòÉΓòÉ 19.2.2.1.2. Associating a Dialog with a Notebook Page ΓòÉΓòÉΓòÉ To illustrate the notebook implemented as a dialog, a properties notebook is used. In this example, the various objects whose properties can be changed or updated are displayed as major tabs. Included are sections that represent a folder, a printer, and a display. The printer object is currently selected. Within the printer object, the user can choose to "View" or "Update" the printer settings. The topmost page is a printer dialog from which the user can update the printer name, type, and device information. Dialog Used As an Application Page Window The sample code in the following figure shows how the printer dialog is created and associated with a notebook page. The example ends by showing the dialog procedure for the associated dialog. Sample Code for Associating a Dialog with a Notebook Page SEL sel = NULL; PDLGTEMPLATE pDlgt; /******************************************************************/ /* Create a dialog. */ /******************************************************************/ DosGetResource(NULL,RT_DIALOG,ID_DLG_PRINTDRV,&sel); pDlgt = MAKEP(sel,0); hwndPage = WinCreateDlg(HWND_DESKTOP, /* Parent window handle */ hwndBook, /* Owner window handle */ fnwpPrint, /* Dialog procedure */ /* address */ pDlgt, /* Dialog structure */ /* address */ NULL); /* Application data */ /********************************************************************/ /* Associate dialog with the inserted notebook page. */ /********************************************************************/ WinSendMsg(hwndBook, BKM_SETPAGEWINDOWHWND, MPFROMLONG(ulPageId), MPFROMHWND(hwndPage)); /********************************************************************/ /* Dialog procedure */ /********************************************************************/ MRESULT EXPENTRY fnwpPrint(HWND hwndDlg, USHORT msg, MPARAM mp1, MPARAM mp2) { switch (msg) { case WM_INITDLG: /**************************************************************/ /* Place dialog initialization code here. */ /**************************************************************/ break; case WM_COMMAND: return ((MRESULT) FALSE); break; default: return WinDefDlgProc (hwndDlg,msg,mp1,mp2); } return WinDefDlgProc (hwndDlg,msg,mp1,mp2); } ΓòÉΓòÉΓòÉ 19.2.3. Deleting Notebook Pages ΓòÉΓòÉΓòÉ The BKM_DELETEPAGE message is used to delete one or more pages from the notebook. The application can delete one page (BKA_SINGLE attribute), all pages within a major or minor tab section (BKA_TAB attribute), or all of the pages in the notebook (BKA_ALL attribute). The default, if no attributes are specified, is to delete no pages. The following example shows how the BKM_QUERYPAGEID message is used to get the ID of the top page and how the BKM_DELETEPAGE message is then used to delete that page. Sample Code for Deleting a Notebook Page /**********************************************************************/ /* Set the range of pages to be deleted. */ /**********************************************************************/ usDeleteFlag = BKA_SINGLE /* Set attribute to delete a single */ /* page. */ /**********************************************************************/ /* Get the ID of the notebook's top page. */ /**********************************************************************/ ulPageId = (ULONG) WinSendMsg( hwndNotebook, /* Notebook window handle */ BKM_QUERYPAGEID, /* Message to query a page ID */ NULL, /* NULL for page ID */ (MPARAM)BKA_TOP); /* Get ID of top page */ /**********************************************************************/ /* Delete the notebook's top page. */ /**********************************************************************/ WinSendMsg( hwndNotebook, /* Notebook window handle */ BKM_DELETEPAGE, /* Message to delete the page */ MPFROMLONG(ulPageId), /* ID of page to be deleted */ (MPARAM)usDeleteFlag); /* Range of pages to be deleted */ ΓòÉΓòÉΓòÉ 19.3. Graphical User Interface Support ΓòÉΓòÉΓòÉ The following describes the support for graphical user interfaces (GUIs) provided by the notebook control. Except where noted, this support conforms to the guidelines in the SAA CUA Advanced Interface Design Reference. The GUI support provided by the notebook control consists of: o Notebook navigation techniques o Tailoring notebook colors. ΓòÉΓòÉΓòÉ 19.3.1. Notebook Navigation Techniques ΓòÉΓòÉΓòÉ The notebook control supports the use of a pointing device and the keyboard for displaying notebook pages and tabs, and for moving the selection cursor from the notebook tabs to the application window and the other way around. The following describes this support. Note: If more than one notebook window is open, displaying a page or tab in one notebook window has no effect on the pages or tabs displayed in any other notebook window. ΓòÉΓòÉΓòÉ 19.3.1.1. Pointing Device Support ΓòÉΓòÉΓòÉ A user can use a pointing device to display notebook pages or tabs by selecting the notebook components described in the following list. The SAA CUA Advanced Guide to User Interface Design defines mouse button 1 (the select button) to be used for selecting these components. This definition also applies to the same button on any other pointing device a user might have. o Selecting tabs using a pointing device A tab can be selected to bring a page that has a major or minor tab attribute to the top of the notebook. The selection cursor, a dotted outline, is drawn inside the tab's border to indicate the selected tab. In addition, the selected tab is given the same background color as the notebook page area. The color of the other tabs is specified in the BKM_SETNOTEBOOKCOLORS message. This helps the user distinguish the selected tab from the other tabs if different colors are used. Since all the tabs are mutually exclusive, only one of them can be selected at a time. Therefore, the only type of selection supported by the notebook control is single selection. This selection type conforms to the guidelines in the SAA CUA Advanced Interface Design Reference. Refer to that book for detailed information about single selection. If the user moves the pointing device to a place in the notebook page window that can accept a cursor, such as an entry field, check box, or radio button, and presses the select button, the selection cursor is removed from the tab it is on and is displayed in the notebook page window. the selection cursor never can be displayed both on a tab and in the notebook page window at the same time. o Selecting page buttons using a pointing device A forward or backward page button can be selected to display the next or previous page, respectively, one at a time. The arrow pointing to the right is the forward page button, and the arrow pointing to the left is the backward page button. When the selection of a page button brings a page that has a major or minor tab to the top of the notebook, the selection cursor is drawn inside that tab's border. o Selecting tab scroll buttons using a pointing device A user can decrease the size of a notebook window so that some of the available notebook tabs cannot be displayed. When this happens, the notebook control automatically draws tab scroll buttons at the corners of the notebook side or sides to notify the user that more tabs are available. Tab scroll buttons have another purpose: to give the user the means to scroll into view, one at a time, the tabs that are not displayed. The user does this by selecting a forward or backward tab scroll button, which causes the next tab to scroll into view, but does not change the location of the selection cursor. Once the tab is in view, the user can display that tab's page by selecting the tab. A maximum of four tab scroll buttons can be displayed: two for the major tab side and two for the minor tab side. The following figure is an example of a notebook with two of its tab scroll buttons displayed on the bottom left and bottom right corners of the minor tab side. Notebook with Tab Scroll Buttons Displayed In this example, only three minor tabs are displayed because the notebook is not wide enough to display more. Here, the user can display a previous minor tab by selecting the backward tab scroll button or a following minor by selecting the forward tab scroll button. When the first tab in the notebook is displayed, the backward tab scroll button is deactivated. Unavailable-state emphasis is applied to it to show that no more tabs can be scrolled into view by using the backward tab scroll button. Unavailable-state emphasis is applied to the forward tab scroll button if the last tab in the notebook is displayed. ΓòÉΓòÉΓòÉ 19.3.1.2. Keyboard Support ΓòÉΓòÉΓòÉ A user can display notebook pages and tabs by using the following keyboard selection techniques. o Selecting tabs using mnemonic selection One keyboard method of displaying notebook pages is mnemonic selection. Mnemonics are underlined characters in the text of a tab that cause the tab's page to be selected. Coding a tilde (~) before a text character in the BKM_SETTABTEXT message causes that character to be underlined and activates it as a mnemonic-selection character. A user performs mnemonic selection by pressing a character key that corresponds to an underlined character. When this happens, the tab that contains the underlined character is selected, and that tab's page is brought to the top of the notebook. Note: Mnemonic selection is not case sensitive, so the user can type the underscored letter in either uppercase or lowercase. o Selecting tabs using the keyboard Another method of displaying a notebook page is to use the Enter key or the spacebar to select a page with a major or minor tab. The selection cursor, described earlier in this section, indicates that a tab can be selected by using either of these keys. When selected, the tab's associated page is brought to the top of the notebook, and the selected tab is given the same background color as the notebook page area. The other tabs have their color specified in the BKM_SETNOTEBOKKCOLORS message. This helps the user distinguish the selected tab from the other tabs if different colors are used. o Moving the selection cursor from tab to tab using the keyboard The selection cursor can be moved from tab to tab by using the Up, Down, Left, and Right Arrow keys. Pressing either the Up or Right Arrow key moves the selection cursor up on a vertical row of tabs or to the right on a horizontal row of tabs. Pressing the Down or Left Arrow keys moves the selection cursor down on a vertical row of tabs or to the left on a horizontal row of tabs. The page associated with the tab to which the selection cursor is moved is not brought to the top of the notebook unless the user selects the tab. If the selection cursor is located on a tab that is not in view, pressing one of these keys moves the selection cursor and positions the tab the selection cursor is moved to in the center of the row of tabs. o Moving the selection cursor between tab positions and controls Pressing the Tab key moves the selection cursor to the next tab position or control. Pressing the Shift+Tab key combination moves the selection cursor to the previous tab position or control. Pressing Ctrl+Tab moves the selection cursor to the next control. o Displaying tabs using the keyboard When the tab scroll buttons are displayed, the Up, Down, Left, and Right Arrow keys can be used to scroll tabs into view. For example, suppose the back pages intersect at the bottom right corner and the selection cursor is on the last visible tab on the right side of the notebook. In this case, pressing either the Down or Right Arrow keys causes the next tab to scroll into view and moves the selection cursor to that tab. The page associated with the tab the selection cursor is moved to is not brought up to the top of the notebook unless the user selects the tab. o Turning notebook pages using the keyboard The PgUp and PgDn keys can be used to display the previous or next page, respectively, one page at a time. This is similar to using a pointing device's select button to select the page buttons. The difference is that, unlike the select button, the PgUp and PgDn keys are typematic, which means the notebook's pages keep turning while these keys are pressed. If the application's primary window has the focus, the PgUp and PgDn keys must be used in combination with the Alt key. The application sends a message to the notebook to turn to the previous or next page. The current top page is used as the page from which to turn. If the notebook window has the focus, the PgUp and PgDn keys can be used alone or in combination with the Alt key. o Switching the focus between the notebook window and the application's primary window The Alt+Up Arrow key combination switches the focus from the application's primary window to the notebook window. The Alt+Down Arrow key combination does the opposite, switching the focus from the notebook window to the application's primary window. If the selection cursor is not in view when the focus switches from the notebook window to the application's primary window, it will not be in view if the focus switches back to the notebook window. For example, the selection cursor may be located on a tab that the user scrolls out of view by selecting a tab scroll button. If the user then presses the Alt+Down key combination, the selection cursor appears in the application's primary window. If the user then presses the Alt+Up Arrow key combination, the selection cursor returns to its last location-the tab that was not in view. o Automatic scrolling to the first or last notebook page The Home key can be used to bring the first page of the notebook to the top. Conversely, the End key brings the last page to the top of the notebook. These selection techniques conform to the descriptions in the SAA CUA Advanced Guide to User Interface Design. Refer to that book for a complete description of the keyboard interface model. ΓòÉΓòÉΓòÉ 19.3.2. Tailoring Notebook Colors ΓòÉΓòÉΓòÉ The application can change the color of any part of the notebook. The colors of some parts can be changed by specifying a presentation parameter attribute or attributes in the WinSetPresParam function. Other colors can be changed by specifying a notebook attribute or attributes in the BKM_SETNOTEBOOKCOLORS message. The following sections define which parts of the notebook can have their colors changed by each of these two methods. ΓòÉΓòÉΓòÉ 19.3.2.1. Changing Colors Using WinSetPresParam ΓòÉΓòÉΓòÉ The WinSetPresParam function is used to change the color of the notebook outline and window background, the selection cursor, and the status line text. The following list shows the mapping between the various notebook parts and their associated presentation parameter attributes. Notebook outline PP_BORDERCOLOR or PP_BORDERCOLORINDEX. This color is set initially to SYSCLR_WINDOWFRAME. Notebook window background PP_BACKGROUNDCOLOR or PP_BACKGROUNDCOLORINDEX. This color is set initially to SYSCLR_FIELDBACKGROUND. Selection cursor PP_HILITEBACKGROUNDCOLOR or PP_HILITEBACKGROUNDCOLORINDEX. This color is set initially to SYSCLR_HILITEBACKGROUND. Status line text PP_FOREGROUNDCOLOR or PP_FOREGROUNDCOLORINDEX. This color is initially set to SYSCLR_WINDOWTEXT. If a presentation parameter attribute is set, all parts of the notebook that are mapped to this color are changed. The following figure shows how to change the color of the notebook outline. Sample Code for Changing the Color of the Notebook Outline usColorLen = 4; /* Set number of bytes to be passed in */ /* usColorIdx for color index table */ /* value. */ ulColorIdx = 3; /* Set color index table value to be */ /* assigned. */ /**********************************************************************/ /* Set the notebook outline color. */ /**********************************************************************/ WinSetPresParam( hwndNotebook, /* Notebook window handle */ PP_BORDERCOLOR, /* Border color attribute */ usColorLen, /* Number of bytes in color index */ /* table value */ &ulColorIdx); /* Color index table value */ ΓòÉΓòÉΓòÉ 19.3.2.2. Changing Colors Using BKM_SETNOTEBOOKCOLORS ΓòÉΓòÉΓòÉ The BKM_SETNOTEBOOKCOLORS message is used to change the color of the major tab background and text, the minor tab background and text, and the notebook page background. The following list shows the mapping between the various notebook parts and their associated notebook attributes. Major tab background BKA_BACKGROUNDMAJORCOLORINDEX or BKA_BACKGROUNDMAJORCOLOR. This color is set initially to SYSCLR_PAGEBACKGROUND. The currently selected major tab will have the same background color as the page background. Major tab text BKA_FOREGROUNDMAJORCOLORINDEX or BKA_FOREGROUNDMAJORCOLOR. This color is set initially to SYSCLR_WINDOWTEXT. Minor tab background BKA_BACKGROUNDMINORCOLORINDEX or BKA_BACKGROUNDMINORCOLOR. This color is set initially to SYSCLR_PAGEBACKGROUND. The currently selected minor tab will have the same background color as the page background. Minor tab text BKA_FOREGROUNDMINORCOLORINDEX or BKA_FOREGROUNDMINORCOLOR. This color is set initially to SYSCLR_WINDOWTEXT. Notebook page background BKA_BACKGROUNDPAGECOLORINDEX or BKA_BACKGROUNDPAGECOLOR. This color is set initially to SYSCLR_PAGEBACKGROUND. If a notebook attribute is set, all parts of the notebook that are mapped to this color are changed. The following figure shows how to change the color of the major tab background. Sample Code for Changing the Color of the Major Tab Background ulColorIdx = SYSCLR_WINDOW; /* Color index value */ ulColorRegion = BKA_BACKGROUNDMAJORCOLORINDEX; /* Major tab background*/ WinSendMsg(hwndBook, BKM_SETNOTEBOOKCOLORS, MPFROMLONG(ulColorIdx), MPFROMLONG(ulColorRegion)); ΓòÉΓòÉΓòÉ 19.4. Enhancing Notebook Control Performance and Effectiveness ΓòÉΓòÉΓòÉ This section provides the following information to enable you to fine-tune a notebook control: o How to dynamically resize and scroll o How to paint and position tabs ΓòÉΓòÉΓòÉ 19.4.1. Dynamic Resizing and Scrolling ΓòÉΓòÉΓòÉ The notebook control supports dynamic resizing by recalculating the size of the notebook's parts when either the user or the application changes the size of any of those parts. A BKN_NEWPAGESIZE notification code is sent from the notebook to the application whenever the notebook's size changes. The notebook handles the sizing and positioning of each application page window if the BKA_AUTOPAGESIZE attribute is specified for the inserted notebook page. Otherwise, the application must handle this when it receives the BKN_NEWPAGESIZE notification code from the notebook. If the size of the notebook window is decreased so that the page window is not large enough to display all the information the page contains, the information in the page window is clipped. If scroll bars are desired to enable the clipped information to be scrolled into view, they must be provided by the application. Tab scroll buttons are automatically displayed if the size of the notebook is decreased so that all the major or minor tabs cannot be displayed. For example, a notebook has major tabs on the right side, but the height of the notebook does not allow all the tabs to be displayed. In this case, tab scroll buttons are displayed on the upper- and lower-right corners of the notebook. ΓòÉΓòÉΓòÉ 19.4.2. Tab Painting and Positioning ΓòÉΓòÉΓòÉ The tab pages provide a method for organizing the information in a notebook so that the user easily can see and navigate to that information. As described in Notebook Control Styles, when a page is inserted with a major or minor tab attribute, the notebook displays a tab for that page, based on the orientation of the notebook. The contents of the tab can be painted either by the notebook control or the application. If the notebook control is to paint the tabs, the application must associate a text string or bit map with the page whose tab is to be drawn. This is done by sending the BKM_SETTABTEXT or BKS_SETTABBITMAP messages to the notebook control for the specified page. If neither of these messages is sent for an inserted page with a major or minor tab attribute, the application must draw the contents of the tab, through ownerdraw. The application receives a WM_DRAWITEM message whenever a tab page that has no text or bit map associated with it is to be drawn. The application can either draw the tab contents or return FALSE, in which case the notebook control fills the tab with the tab background color. Positioning Tabs in Relation to the Top Tab: There are seven page edges that define the back pages. The page attribute (BKA_MAJOR or BKS_MINOR) and the topmost page determine how the tabs are positioned. In most cases, the tabs must be drawn when their position changes. For example, this can happen when a page with a tab attribute is brought to the top of the notebook. The new top major or minor tab will appear attached to the top page. The other tabs will appear as described in the following list. This information is provided to help you understand the relationship between the top tab and the other tabs so that you can organize the information you put into a notebook appropriately. The application has no control over tab positioning. o When the top page is a major tab page: - Any major tabs prior to the top major tab are aligned on the last page of the notebook. - Any major tabs after the top major tab are incrementally cascaded from the topmost edge to the last page. - If the top major tab has minor tabs, no major tab is drawn on the page edge that immediately follows the top tab page. Instead, any major tabs that follow the top tab are incrementally cascaded beginning on the second page edge down from the top tab. This is done to account for the minor tabs that are positioned between the top major tab and the major tab that follows it on the perpendicular notebook edge. The minor tabs are all positioned on the third page edge from the top, thus giving the appearance of being between the top major tab and the next major tab. o When the top page is a minor tab page: - Any minor tabs prior to the top minor tab are positioned on the third page edge from the top of the notebook. - Any minor tabs after the top minor tab are incrementally cascaded up to the third page edge from the top. ΓòÉΓòÉΓòÉ 19.5. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 structures, notification codes, notification messages, and window messages used with the notebook control: Notebook Control Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBOOKTEXT ΓöéContains text strings for notebook Γöé Γöé Γöéstatus lines and tabs. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDELETENOTIFY ΓöéContains information about the page Γöé Γöé Γöébeing deleted from a notebook. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéPAGESELECTNOTIFY ΓöéContains information about the page Γöé Γöé Γöébeing selected in a notebook. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Notebook Control Notification Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKN_HELP ΓöéIndicates that the notebook control Γöé Γöé Γöéhas received a WM_HELP message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKN_NEWPAGESIZE ΓöéIndicates that the dimensions of theΓöé Γöé Γöénotebook page window have changed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKN_PAGEDELETED ΓöéIndicates that a page has been Γöé Γöé Γöédeleted from the notebook. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKN_PAGESELECTED ΓöéIndicates that a new page has been Γöé Γöé Γöébrought to the top of the notebook. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Notebook Control Notification Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when a control has a Γöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to the notebook control's ownerΓöé Γöé Γöéwindow when the pointing device Γöé Γöé Γöépointer moves over the notebook Γöé Γöé Γöécontrol window, enabling the owner Γöé Γöé Γöéto set the pointing device pointer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DRAWITEM ΓöéSent to the owner of the notebook Γöé Γöé Γöécontrol each time an item is to be Γöé Γöé Γöédrawn. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Notebook Control Window Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_CALCPAGERECT ΓöéCalculates a window rectangle Γöé Γöé Γöéfrom a notebook rectangle or aΓöé Γöé Γöénotebook rectangle from a Γöé Γöé Γöéwindow rectangle, depending onΓöé Γöé Γöéthe setting of the fPage Γöé Γöé Γöéparameter. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_DELETEPAGE ΓöéDeletes the specified page or Γöé Γöé Γöépages from the notebook data Γöé Γöé Γöélist. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_INSERTPAGE ΓöéInserts the specified page Γöé Γöé Γöéinto the notebook data list. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_INVALIDATETABS ΓöéRepaints all the tabs in the Γöé Γöé Γöénotebook. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYPAGECOUNT ΓöéQueries the number of pages. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYPAGEDATA ΓöéQueries the 4 bytes of Γöé Γöé Γöéapplication-reserved storage Γöé Γöé Γöéassociated with the specified Γöé Γöé Γöépage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYPAGEID ΓöéQueries the page identifier Γöé Γöé Γöéfor the specified page. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYPAGESTYLE ΓöéQueries the style that was setΓöé Γöé Γöéwhen the specified page was Γöé Γöé Γöéinserted. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYPAGEWINDOWHWND ΓöéQueries the notebook page Γöé Γöé Γöéwindow handle associated with Γöé Γöé Γöéthe specified page. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYSTATUSLINETEXT ΓöéQueries the status line text, Γöé Γöé Γöétext size, or both, for the Γöé Γöé Γöéspecified page. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYTABBITMAP ΓöéQueries the bit-map handle Γöé Γöé Γöéassociated with the specified Γöé Γöé Γöépage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_QUERYTABTEXT ΓöéQueries the text, text size, Γöé Γöé Γöéor both, for the specified Γöé Γöé Γöépage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_SETDIMENSIONS ΓöéSets the height and width for Γöé Γöé Γöéthe major tabs, minor tabs, orΓöé Γöé Γöépage buttons. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_SETNOTEBOOKCOLORS ΓöéSets the colors for the major Γöé Γöé Γöétab text and background, minorΓöé Γöé Γöétab text and background, and Γöé Γöé Γöénotebook page background. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_SETPAGEDATA ΓöéSets the 4 bytes of Γöé Γöé Γöéapplication-reserved storage Γöé Γöé Γöéassociated with the specific Γöé Γöé Γöépage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_SETPAGEWINDOWHWND ΓöéAssociates a notebook page Γöé Γöé Γöéwindow handle with the Γöé Γöé Γöéspecified notebook page. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_SETSTATUSLINETEXT ΓöéAssociates a text string with Γöé Γöé Γöéthe status line on the Γöé Γöé Γöéspecified page. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_SETTABBITMAP ΓöéAssociates a bit-map handle Γöé Γöé Γöéwith the specified page. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_SETTABTEXT ΓöéAssociates a text string with Γöé Γöé Γöéthe specified page. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéBKM_TURNTOPAGE ΓöéBrings the specified page to Γöé Γöé Γöéthe top of the notebook. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéOccurs when the user presses aΓöé Γöé Γöékey. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PRESPARAMCHANGED ΓöéOccurs when a presentation Γöé Γöé Γöéparameter is set or removed Γöé Γöé Γöédynamically from a window Γöé Γöé Γöéinstance. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SIZE ΓöéOccurs when the size of the Γöé Γöé Γöénotebook window changes. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 20. Slider Controls ΓòÉΓòÉΓòÉ A slider control (WC_SLIDER window class) is a visual component that enables a user to set, display, or modify a value by moving the slider arm along the slider shaft. This chapter explains how you can use slider controls in your PM applications. ΓòÉΓòÉΓòÉ 20.1. About Slider Controls ΓòÉΓòÉΓòÉ The following figure is an example of a slider used to set a decibel value. Sample Slider The slider arm shows the value currently set by its position on the slider shaft. The user selects slider values by changing the location of the slider arm. A tick mark indicates an incremental value in a slider scale. A detent, similar to a tick mark, also represents a value on the scale; however, a detent can be placed anywhere along the slider scale, instead of only in specific increments, and can be selected. Typically, sliders are used to easily set values that have familiar increments, such as feet, inches, degrees, decibels, and so forth. They also can be used for other purposes when immediate feedback is required, such as to blend colors or show a task's percentage of completion. For example, an application might let a user mix and match color shades by moving a slider arm, or a read-only slider could show how much of a task is complete by filling in the slider shaft as the task progresses. These are just a few examples of the many ways in which sliders can be used. The appearance of and user interaction for a slider is similar to that of a scroll bar. However, these two controls are not interchangeable because each has a unique purpose. A scroll bar scrolls information into view that is outside a window's work area, while the slider is used to set, display, or modify that information, whether it is in or out of the work area. The slider can be customized to meet varying application requirements, while providing a user interface component that can be used easily to develop products that conform to the Common User Access (CUA) user interface guidelines. The application can specify different scales, sizes, and orientations for its sliders, but the underlying function of the control remains the same. For a complete description of CUA sliders, refer to the SAA CUA Guide to User Interface Design and the SAA CUA Advanced Interface Design Reference. ΓòÉΓòÉΓòÉ 20.2. Creating a Slider ΓòÉΓòÉΓòÉ Before the slider is created, a temporary SLDCDATA data structure is allocated, and variables are specified for the slider control window handle and slider style. The SLDCDATA data structure is allocated so that the scale increments and spacing of the slider can be specified. Refer to the OS/2 Programming Reference for more information about the SLDCDATA data structure. The slider style variable enables the application to specify style bits, SLS_* values, that are used to customize the slider. Refer to the OS/2 Programming Reference for the definitions of these values. You create a slider by using the WC_SLIDER window class name in the ClassName parameter of the WinCreateWindow function call. The handle of the slider control window is returned in the slider window variable. After the slider is created, but before it is made visible, the application can set other slider control characteristics, such as: o Size and placement of tick marks o Text above one or more tick marks o One or more detents o Initial slider arm position. The settings in the preceding list are just a few that an application can specify and are the ones shown in the following sample code for creating a slider. Slider control messages are used to specify these settings. A detailed description of the messages is available in the OS/2 2.0 Programming Reference. The main components of the slider are labeled. Sample Code for Creating a Slider SLDCDATA sldcData; /* SLDCDATA data structure */ CHAR szTickText[5]; /* Text strings variable */ USHORT idx; /* Counter for setting text strings */ HWND hwndSlider; /* Slider window handle */ ULONG ulSliderStyle; /* Slider styles */ /**********************************************************************/ /* Initialize the parameters in the data structure. */ /**********************************************************************/ sldcData.cbSize = sizeof(SLDCDATA); /* Size of SLDCDATA structure */ sldcData.usScale1Increments = 6; /* Number of increments */ sldcData.usScale1Spacing = 0; /* Use 0 to have slider calculate */ /* spacing */ /**********************************************************************/ /* Set the SLS_* style flags to the default values, plus slider */ /* buttons right. */ /**********************************************************************/ ulSliderStyle = SLS_HORIZONTAL | /* Slider is horizontal */ SLS_CENTER | /* Slider shaft centered in */ /* slider window */ SLS_HOMELEFT | /* Home position is left edge of */ /* slider */ SLS_PRIMARYSCALE1 | /* Scale is displayed above */ /* slider shaft */ SLS_BUTTONSRIGHT; /* Slider buttons at right end of */ /* slider */ /**********************************************************************/ /* Create the slider control window. The handle of the window is */ /* returned in hwndSlider. */ /**********************************************************************/ hwndSlider = WinCreateWindow( hwndClient, /* Parent window handle */ WC_SLIDER, /* Slider window class name */ (PSZ)NULL, /* No window text */ ulSliderStyle, /* Slider styles variable */ (SHORT)10, /* X coordinate */ (SHORT)10, /* Y coordinate */ (SHORT)150, /* Window width */ (SHORT)80, /* Window height */ hwndClient, /* Owner window handle */ HWND_TOP, /* Sibling window handle */ ID_SLIDER, /* Slider control window ID */ &sldcData, /* Control data structure */ (PVOID)NULL); /* No presentation parameters */ /**********************************************************************/ /* Set tick marks at several places on the slider shaft using the */ /* primary scale. */ /**********************************************************************/ WinSendMsg(hwndSlider, /* Slider window handle */ SLM_SETTICKSIZE, /* Message for setting tick mark size*/ MPFROM2SHORT( SMA_SETALLTICKS, /* Attribute for setting all tick */ /* marks to the same size */ 6), /* Draw tick marks 6 pixels long */ NULL); /* Reserved value */ /**********************************************************************/ /* Set text above the tick marks. */ /**********************************************************************/ for (idx = 0; idx <= 5; idx++) /* Count from 0 to 5 */ { itoa( 10*idx, szTickText, 10 ); /* Set text at increments of 10 */ WinSendMsg(hwndSlider, /* Slider window handle */ SLM_SETSCALETEXT, /* Message for setting text on a */ /* slider scale */ MPFROMSHORT(idx), /* Text string counter */ MPFROMPSZ(szTickText)); /* Text to put on slider scale */ } /**********************************************************************/ /* Set detents between two of the tick marks on the slider shaft. */ /**********************************************************************/ WinSendMsg(hwndSlider, /* Slider window handle */ SLM_ADDDETENT, /* Message for adding detents to a */ /* slider scale */ MPFROMSHORT(5), /* Put a detent 5 pixels from home */ NULL); /* Reserved value */ WinSendMsg(hwndSlider, /* Slider window handle */ SLM_ADDDETENT, /* Message for adding detents to a */ /* slider scale */ MPFROMSHORT(25), /* Put a detent 25 pixels from home */ NULL); /* Reserved value */ /**********************************************************************/ /* Set the slider arm position to the 1st increment on the scale. */ /**********************************************************************/ WinSendMsg(hwndSlider, /* Slider window handle */ SLM_SETSLIDERINFO, /* Message for setting slider */ /* attributes */ MPFROM2SHORT( SMA_SLIDERARMPOSITION, /* Modify slider arm position */ SMA_INCREMENTVALUE), /* Use an increment value */ MPFROMSHORT(1); /* Value to use is 1st */ /* increment */ /**********************************************************************/ /* Since all items have been set, make the control visible. */ /**********************************************************************/ WinShowWindow(hwndSlider, /* Slider window handle */ TRUE); /* Make the window visible */ ΓòÉΓòÉΓòÉ 20.3. Retrieving Data for Selected Slider Values ΓòÉΓòÉΓòÉ To retrieve data represented by a slider value, specify a variable for the current position of the slider arm. Then, use the SLM_QUERYSLIDERINFO message to retrieve information about the current slider arm position in increment coordinates. The code fragment in the following figure shows how to retrieve data for a selected slider value. Retrieving a Slider Value ULONG ulValue; /* Variable in which to store current */ /* slider arm position */ /**********************************************************************/ /* Get the information about the current slider arm position in */ /* incremental coordinates. */ /**********************************************************************/ ulValue = (ULONG)WinSendMsg( hwndSlider, /* Slider window handle */ SLM_QUERYSLIDERINFO, /* Message for querying slider */ /* attributes */ MPFROM2SHORT( SMA_SLIDERARMPOSITION, /* Get increment at which slider arm */ SMA_INCREMENTVALUE), /* is located */ NULL); /* Reserved value */ ΓòÉΓòÉΓòÉ 20.4. Graphical User Interface Support for Sliders ΓòÉΓòÉΓòÉ This section describes the support the slider control provides for graphical user interfaces (GUIs). Except where noted, this support conforms to the guidelines in the SAA CUA Advanced Interface Design Reference. Since slider values all are mutually exclusive, only one of them can be selected at a time. Therefore, the only type of selection supported by the slider control is single selection. Note: If more than one slider window is open, selecting values in one slider window has no effect on the values selected in any other slider window. A black square is drawn in the center of the slider arm to show which slider control window has the focus. An initial value is selected when the slider control first is displayed. If the application does not provide the initial selection, using the SLM_SETSLIDERINFO message to position the slider arm, the value at the home position is selected automatically. The home position is the end of the slider that contains the lowest value on the scale. The slider control supports the use of pointing devices and the keyboard for selecting values. ΓòÉΓòÉΓòÉ 20.4.1. Pointing Device Support ΓòÉΓòÉΓòÉ A user can select slider values with a pointing device. On a mouse, the SAA CUA Guide to User Interface Design defines button 1 (the select button) as the button for selecting values, and button 2 (the drag button) for dragging the slider arm to a value. These definitions also apply to the same buttons on any other pointing device, such as a joystick. The select button and drag button can be used in conjunction with the following slider components to select slider values: o Slider arm Moving the pointer over the slider arm, then pressing and holding the select or drag buttons while moving the pointer, causes the slider arm to move in the direction the pointer is moving. When the button is released, the value closest to the slider arm position becomes the selected value. o Slider shaft Clicking the select button when the pointer is over the slider shaft causes the slider arm to move one increment in the direction of the pointer. Increments are determined by the initial values passed for the primary scale specified (SLS_PRIMARYSCALE1 or SLS_PRIMARYSCALE2) when the slider is created. Clicking the drag button when the pointer is over the slider shaft causes the slider arm to move to the pointer's location. o Slider buttons Clicking the select button when the pointer is over a slider button causes the slider arm to move one increment in the direction the arrow on the slider button is pointing. Slider buttons are optional. If used, two slider buttons are available to the user. The arrows on top of the slider buttons point to opposite ends of the slider. Both slider buttons are positioned at the same end of the slider. Slider buttons are enabled by specifying the appropriate SLS_* value when the slider control window is created. For horizontal sliders, you can specify either SLS_BUTTONSLEFT or SLS_BUTTONSRIGHT. For vertical sliders, you can specify either SLS_BUTTONSBOTTOM or SLS_BUTTONSTOP. The default is no slider buttons. If more than one of these style bits is specified, no slider buttons are enabled. o Detents A detent is similar to a tick mark on a slider scale because it represents a value on the scale. However, unlike a tick mark, a detent can be placed anywhere along the slider scale instead of in specific increments. A detent can be selected by moving the pointer over it and pressing the select button on the pointing device. When this happens, the slider arm moves to the position on the slider shaft indicated by the detent. ΓòÉΓòÉΓòÉ 20.4.2. Keyboard Support ΓòÉΓòÉΓòÉ A user can select a value by using the navigation keys to move the slider arm to the value or by typing a value in an entry field, if one is provided by the application, to change the slider arm position. The following list describes these methods of selecting slider values. o Values can be selected using the Up, Down, Left, and Right Arrow keys to move the slider arm one increment at a time. The Up and Down Arrow keys are enabled for vertical sliders, and the Right and Left Arrow keys are enabled for horizontal sliders. If no tick mark exists on the scale in the requested direction, the slider arm does not move. If an Arrow key is pressed in conjunction with the Shift key, the slider arm moves to the next detent instead of the next tick mark. If no detent exists on the scale in the requested direction, the slider arm does not move. o The Home and End keys can be used to select the lowest and highest values, respectively, in the scale. If the Ctrl key is pressed in combination with the Home or End keys, the result is the same as pressing only the Home or End keys. o The application can provide an optional entry field for the slider control. The entry field is a separate control, but it can work in conjunction with the slider control. If the application provides an entry field for the slider control window, it must be implemented as follows: - The user must be allowed to type a value into the entry field. - If the typed value is within the range of the slider scale, the slider arm moves to that value as soon as the value is typed. - No other action, such as pressing the Enter key, is required. These selection techniques conform to the descriptions in the SAA CUA Guide to User Interface Design. ΓòÉΓòÉΓòÉ 20.5. Summary ΓòÉΓòÉΓòÉ Following are tables that describe the OS/2 functions, structure, notification codes, notification messages, and window messages used with the slider control. Slider Control Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateWindow ΓöéCreates a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSendMsg ΓöéSends a message with identity Msgid Γöé Γöé Γöéto hwnd. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinShowWindow ΓöéSets the visibility state of a Γöé Γöé Γöéwindow. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Slider Control Structure ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLDCDATA ΓöéSlider control data structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Slider Control Notification Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLN_CHANGE ΓöéSent when the slider arm Γöé Γöé Γöéposition has changed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLN_KILLFOCUS ΓöéSent when the slider control Γöé Γöé Γöéis losing the focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLN_SETFOCUS ΓöéSent when the slider control Γöé Γöé Γöéis receiving the focus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLN_SLIDERTRACK ΓöéSent when the slider arm is Γöé Γöé Γöébeing dragged, but it has not Γöé Γöé Γöébeen released. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Slider Control Notification Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when the slider control has aΓöé Γöé Γöésignificant event to notify to its Γöé Γöé Γöéowner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to the owner window of the Γöé Γöé Γöéslider control when the pointing Γöé Γöé Γöédevice pointer moves over the sliderΓöé Γöé Γöécontrol window, enabling the owner Γöé Γöé Γöéwindow to set the pointer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DRAWITEM ΓöéSent to the owner of the slider Γöé Γöé Γöécontrol each time an item is to be Γöé Γöé Γöédrawn. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Slider Control Window Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_ADDDETENT ΓöéPlaces a detent along the slider Γöé Γöé Γöéshaft at the position specified on Γöé Γöé Γöéthe primary scale. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_QUERYDETENTPOS ΓöéQueries for the current position of Γöé Γöé Γöéa detent. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_QUERYSCALETEXT ΓöéQueries for the text associated withΓöé Γöé Γöéa tick mark for the primary scale Γöé Γöé Γöéand copies that text into a buffer. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_QUERYSLIDERINFO ΓöéQueries the current position or Γöé Γöé Γöédimensions of a key component of theΓöé Γöé Γöéslider. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_QUERYTICKPOS ΓöéQueries for the current position of Γöé Γöé Γöéa tick mark for the primary scale. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_QUERYTICKSIZE ΓöéQueries for the size of a tick mark Γöé Γöé Γöéfor the primary scale. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_REMOVEDETENT ΓöéRemoves a previously specified Γöé Γöé Γöédetent. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_SETSCALETEXT ΓöéSets text above a tick mark for the Γöé Γöé Γöéprimary scale. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_SETSLIDERINFO ΓöéSets the current position or Γöé Γöé Γöédimensions of a key component of theΓöé Γöé Γöéslider. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSLM_SETTICKSIZE ΓöéSets the size of a tick mark for theΓöé Γöé Γöéprimary scale. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéOccurs when the user presses a key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PRESPARAMCHANGED ΓöéSent when a presentation parameter Γöé Γöé Γöéis set or removed dynamically from aΓöé Γöé Γöéwindow instance. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application queries Γöé Γöé Γöéthe window parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application sets or Γöé Γöé Γöéchanges the window parameters. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 21. Value Set Controls ΓòÉΓòÉΓòÉ A value set control (WC_VALUESET window class), like a radio button, is a visual component that enables a user to select one choice from a group of mutually exclusive choices. However, unlike radio buttons, a value set can use graphic images (bit maps or icons), as well as colors, text, and numbers, to represent the items a user can select. This chapter presents the basics about value set controls and tells you how to create and use them in PM applications. ΓòÉΓòÉΓòÉ 21.1. About Value Sets ΓòÉΓòÉΓòÉ Even though text is supported, the purpose of a value set control is to display choices as graphic images for faster selection. The user can see the selections instead of having to take time to read descriptions of the choices. Using graphic images in a value set also lets you conserve space on the display screen. For example, if you want to let a user choose from a variety of patterns, you can present those patterns as value set choices, as shown in the following figure, instead of providing a list of radio buttons with a description of each pattern. Sample Value Set If long strings of data are to be displayed as choices, radio buttons should be used. However, for small sets of numeric or textual information, you can use either a value set or radio buttons. The value set is customizable to meet varying application requirements, while providing a user interface component that can be used easily to develop products that conform to the Common User Access (CUA) user interface guidelines. The application can specify different types of items, sizes, and orientations for its value sets, but the underlying function of the control remains the same. For a complete description of CUA value sets, refer to the SAA CUA Guide to User Interface Design and the SAA CUA Advanced Interface Design Reference. ΓòÉΓòÉΓòÉ 21.1.1. Creating and Using Value Set Controls ΓòÉΓòÉΓòÉ This section provides information that will enable you to create and use a value set control effectively. ΓòÉΓòÉΓòÉ 21.1.1.1. Creating a Value Set ΓòÉΓòÉΓòÉ You create a value set by using the WC_VALUESET window class name in the ClassName parameter of the WinCreateWindow function call. Before the value set is created, a temporary VSCDATA data structure is allocated so that the number of rows and columns of the value set can be specified. Refer to the OS/2 2.0 Programming Reference for more information about the VSCDATA data structure. Also, VS_* values are specified in the ulValueSetStyle variable so that the value set can be customized. Refer to the OS/2 2.0 Programming Reference for descriptions of the value set control styles that can be specified. The sample code in the following figure shows the creation of a value set. Sample Code for Creating a Value Set VSCDATA vscData; /* VSCDATA data structure */ HWND hwndValueSet; /* Value set window handle */ ULONG ulValueSetStyle; /* Value set style variable */ /**********************************************************************/ /* Initialize the parameters in the data structure. */ /**********************************************************************/ vscData.cbSize = /* Size of value set equals size of */ sizeof(VSCDATA); /* VSCDATA */ vscData.usRowCount = 1; /* 1 row in the value set */ vscData.usColumnCount = 3; /* 3 columns in the value set */ /**********************************************************************/ /* Set the VS_* style flags to customize the value set. */ /**********************************************************************/ ulValueSetStyle = VS_RGB | /* Use colors for items. */ VS_ITEMBORDER | /* Put border around each value */ /* set item. */ VS_BORDER; /* Put border around the entire */ /* value set. */ /**********************************************************************/ /* Create the value set control window. The handle of the window is */ /* returned in hwndValueSet. */ /**********************************************************************/ hwndValueSet = WinCreateWindow( hwndClient, /* Parent window handle */ WC_VALUESET, /* Value set class name */ (PSZ)NULL, /* No window text */ ulValueSetStyle, /* Value set styles */ (SHORT)10, /* X coordinate */ (SHORT)10, /* Y coordinate */ (SHORT)300, /* Window width */ (SHORT)200, /* Window height */ hwndClient, /* Owner window handle */ HWND_TOP, /* Z-order position */ ID_VALUESET, /* Value set window ID */ &vscData, /* Control data structure */ (PVOID)NULL); /* No presentation parameters */ /**********************************************************************/ /* Set the color value for each item in each row and column. */ /**********************************************************************/ WinSendMsg(hwndValueSet, /* Value set window handle */ VM_SETITEM, /* Message for setting items */ MPFROM2SHORT(1,1), /* Set item in row 1, column 1 */ MPFROMLONG(0x00FF0000)); /* to the color red. */ WinSendMsg(hwndValueSet, /* Value set window handle */ VM_SETITEM, /* Message for setting items */ MPFROM2SHORT(1,2), /* Set item in row 1, column 2 */ MPFROMLONG(0x0000FF00)); /* to the color green. */ WinSendMsg(hwndValueSet, /* Value set window handle */ VM_SETITEM, /* Message for setting items */ MPFROM2SHORT(1,3), /* Set item in row 1, column 3 */ MPFROMLONG(0x000000FF)); /* to the color blue. */ /**********************************************************************/ /* Set the default selection. */ /**********************************************************************/ WinSendMsg(hwndValueSet, /* Value set window handle */ VM_SELECTITEM, /* Message for selecting items */ MPFROM2SHORT(1,2), /* Item in row 1, column 2 */ NULL); /* Reserved value */ /**********************************************************************/ /* Since all items have been set in the control, make the control */ /* visible. */ /**********************************************************************/ WinShowWindow(hwndValueSet, /* Value set window handle */ TRUE); /* Make the window visible */ ΓòÉΓòÉΓòÉ 21.1.1.2. Retrieving Data for Selected Value Set Items ΓòÉΓòÉΓòÉ The next step is to be able to retrieve the data represented by a value set item. To do this, variables are specified for combined row and column index values, item attributes, and item information. Then the VM_QUERYSELECTEDITEM, VM_QUERYITEMATTR, and VM_QUERYITEM messages are used to retrieve the index values, attributes, and data. Refer to the descriptions of these messages in the OS/2 2.0 Programming Reference for more information. The sample code in the following figure shows how data for selected value set items is retrieved. Sample Code for Retrieving Data for Value Set Items ULONG ulIdx; /* Combined row and column index value */ USHORT usItemAttr; /* Item attributes */ ULONG ulItemData; /* Item data */ /**********************************************************************/ /* Get the row and column index values of the item selected by the */ /* user. These values are returned in the ulIdx parameter. */ /**********************************************************************/ ulIdx = (ULONG)WinSendMsg( hwndValueSet, /* Value set window handle */ VM_QUERYSELECTEDITEM, /* Message for querying the selected */ /* item */ NULL, NULL); /* Reserved values */ /**********************************************************************/ /* Determine the type of item that was selected. This message is */ /* only to determine how to interpret item data when a value set */ /* contains different types of items. */ /**********************************************************************/ usItemAttr = (USHORT)WinSendMsg( hwndValueSet, /* Value set window handle */ VM_QUERYITEMATTR, /* Message for querying item attribute */ MPFROMLONG(ulIdx), /* Row and column of selected item */ NULL); /* Reserved value */ /**********************************************************************/ /* Get the information about the selected (non-textual) item. If you */ /* are dealing with text, you need to allocate a buffer for the text */ /* string. */ /**********************************************************************/ ulItemData = (ULONG)WinSendMsg( hwndValueSet, /* Value set window handle */ VM_QUERYITEM, /* Message for querying an item */ MPFROMLONG(ulIdx), /* Row and column of selected item */ NULL); /* Set to NULL because the item is not */ /* a text item. */ ΓòÉΓòÉΓòÉ 21.1.1.3. Arranging Value Set Items ΓòÉΓòÉΓòÉ The application defines the arrangement of value set items; they can be arranged in one or more rows, columns, or both. Items are placed from left to right in rows and from top to bottom in columns. The application can change the number of rows and columns at any time. The number of items that can be displayed depends on the number of items that fit into the spaces provided by the defined rows and columns. If the number of items exceeds the number of spaces, the excess items are not displayed. You can change the composition of a value set by specifying new items. The new items either can be added to the value set or can replace existing items. ΓòÉΓòÉΓòÉ 21.2. Graphical User Interface Support ΓòÉΓòÉΓòÉ This section describes the support the value set control provides for graphical user interfaces (GUIs). Except where noted, this support conforms to the guidelines in the SAA CUA Advanced Interface Design Reference. The GUI support provided by the value set control consists of: o Navigating to and selecting value set items o Dynamic resizing. ΓòÉΓòÉΓòÉ 21.2.1. Navigating to and Selecting Value Set Items ΓòÉΓòÉΓòÉ Since all value set items are mutually exclusive, only one of them can be selected at a time. Therefore, the only type of selection supported by the value set control is single selection. This selection type conforms to the guidelines in the SAA CUA Advanced Interface Design Reference. Refer to that book for detailed information about single selection. Note: If more than one value set window is open, navigating to and selecting items in one value set window has no affect on the items displayed in any other value set window. An initial choice is selected when the value set control is first displayed. If the application does not provide the initial selection by using the VM_SELECTITEM message, the choice in row 1, column 1 is selected automatically. The value set control supports the use of a pointing device, such as a mouse, and the keyboard for navigating to and selecting items, except for items that are dimmed on the screen. This dimming of items is called unavailable-state emphasis and indicates that the items cannot be selected. However, the selection cursor, a dotted outline that usually indicates that an item can be selected, can be moved to unavailable items so that a user can press F1 to determine why they cannot be selected. The following sections describe the pointing device and keyboard support for the value set control. ΓòÉΓòÉΓòÉ 21.2.1.1. Pointing Device Support ΓòÉΓòÉΓòÉ A user can use a pointing device to select value set items. The SAA CUA Guide to User Interface Design defines mouse button 1, the select button, to be used for selecting items. This definition also applies to the same button on any other pointing device. An item can be selected by moving the pointer of the pointing device to the item and clicking the select button. When this happens, a black box is drawn around the item to show that it has been selected. The black box is called selected-state emphasis. In addition, the selection cursor is drawn inside the black box. ΓòÉΓòÉΓòÉ 21.2.1.2. Keyboard Support ΓòÉΓòÉΓòÉ The value set control supports automatic selection, which means that an available item is selected when the selection cursor is moved to that item. The item is given selected-state emphasis as soon as the selection cursor is moved to it. No further action, such as pressing the spacebar, is required. The same black box and dotted outline are used, for selected-state emphasis and the selection cursor respectively, as when an item is selected with a pointing device. A user can navigate to and select an item by using either the navigation keys or mnemonic selection to move the selection cursor to the item, as described in the following list: o Items can be selected using the Up, Down, Left, and Right Arrow keys to move the selection cursor from one item to another. o The Home and End keys can be used to select the leftmost and rightmost items, respectively, in the current row. If the Ctrl key is pressed in combination with the Home or End key, the item in the top row and the leftmost column, or the item in the bottom row and the rightmost column, respectively, is selected. Note: The preceding description assumes that the current style of the value set window is left-to-right. However, if the VS_RIGHTTOLEFT style bit is set, the directions described for the Home, End, Ctrl+Home, and Ctrl+End keys in the preceding paragraph are reversed. o The PgUp key can be used to select the item in the top row that is directly above the current position of the selection cursor. The PgDn key can be used to select the item in the bottom row that is directly below the current position of the selection cursor. If the space in the top or bottom row directly above or below the current cursor position is blank, the cursor moves to the blank space. o Another keyboard method of selecting items is mnemonic selection. A user performs mnemonic selection by pressing a character key that corresponds to an underlined character. Coding a tilde (~) before a text character in the item causes that character to be underlined and activates it as a mnemonic selection character. When this happens, the selection cursor is moved to the item that contains the underlined character, and that item is selected. These selection techniques conform to the descriptions in the SAA CUA Guide to User Interface Design. Refer to the SAA CUA Guide to User Interface Design for a complete description of the keyboard interface model. ΓòÉΓòÉΓòÉ 21.2.2. Dynamic Resizing ΓòÉΓòÉΓòÉ The value set control supports dynamic resizing if the application sends the WM_SIZE message to a value set window. This means that the value set control automatically recalculates the size of the items when either the user or the application changes the size of the value set window. If the value set window's size is decreased so that the window is not large enough to display all of the items the value set contains, the items are clipped. If scroll bars are desired to allow the clipped information to be scrolled into view, they must be provided by the application. ΓòÉΓòÉΓòÉ 21.3. Summary ΓòÉΓòÉΓòÉ The following tables describe the OS/2 structures, functions, notification codes, notification messages, and window messages used with value set controls. Value Set Control Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVSCDATA ΓöéContains information about the valueΓöé Γöé Γöéset control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVSDRAGINFO ΓöéContains information about direct Γöé Γöé Γöémanipulation actions that occur overΓöé Γöé Γöéthe value set control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVSDRAGINIT ΓöéContains information that is used toΓöé Γöé Γöéinitialize a direct manipulation Γöé Γöé Γöéaction over the value set control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVSTEXT ΓöéContains value set text. Used only Γöé Γöé Γöéwith the VM_QUERYITEM message. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Value Set Control Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateWindow ΓöéCreates a new window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSendMsg ΓöéSends a message to a window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinShowWindow ΓöéSets the visibility state of a Γöé Γöé Γöéwindow Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Value Set Control Notification Codes ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéCode Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_DRAGLEAVE ΓöéSent when the value set receives a Γöé Γöé ΓöéDM_DRAGLEAVE message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_DRAGOVER ΓöéSent when the value set receives a Γöé Γöé ΓöéDM_DRAGOVER message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_DROP ΓöéSent when the value set receives a Γöé Γöé ΓöéDM_DROPHELP message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_DROPHELP ΓöéSent when the value set receives a Γöé Γöé ΓöéDM_DROPHELP message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_ENTER ΓöéSent when the user presses the EnterΓöé Γöé Γöékey while the value set window has Γöé Γöé Γöéthe focus, or when the user Γöé Γöé Γöédouble-clicks the select button Γöé Γöé Γöéwhile the pointer is over an item inΓöé Γöé Γöéthe value set. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_HELP ΓöéSent when the value set receives a Γöé Γöé ΓöéWM_HELP message. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_INITDRAG ΓöéSent when the drag button is pressedΓöé Γöé Γöéand the pointer is moved while over Γöé Γöé Γöéthe value set control. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_KILLFOCUS ΓöéSent when the value set loses the Γöé Γöé Γöéfocus. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_SELECT ΓöéSent when an item in the value set Γöé Γöé Γöéis selected and given selected-stateΓöé Γöé Γöéemphasis. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVN_SETFOCUS ΓöéSent when the value set receives theΓöé Γöé Γöéfocus. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Value Set Control Notification Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROL ΓöéOccurs when the value set control Γöé Γöé Γöéhas a significant event to notify toΓöé Γöé Γöéits owner. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CONTROLPOINTER ΓöéSent to the owner window of the Γöé Γöé Γöévalue set control when the pointing Γöé Γöé Γöédevice pointer moves over the value Γöé Γöé Γöéset control window, enabling the Γöé Γöé Γöépointer to be set. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_DRAWITEM ΓöéSent to the owner of the value set Γöé Γöé Γöécontrol each time an item is to be Γöé Γöé Γöédrawn. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Value Set Control Window Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_QUERYITEM ΓöéQueries the contents of the Γöé Γöé Γöéitem indicated by the row and Γöé Γöé Γöécolumn values. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_QUERYITEMATTR ΓöéQueries the attributes of the Γöé Γöé Γöéitem indicated by the row and Γöé Γöé Γöécolumn values. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_QUERYMETRICS ΓöéQueries the current size of Γöé Γöé Γöéeach value set item or the Γöé Γöé Γöéspacing between items. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_QUERYSELECTEDITEM ΓöéQueries for the currently Γöé Γöé Γöéselected value set item Γöé Γöé Γöéindicated by the row and Γöé Γöé Γöécolumn values. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_SELECTITEM ΓöéSelects the value set item Γöé Γöé Γöéindicated by the row and Γöé Γöé Γöécolumn values. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_SETITEM ΓöéSpecifies the type of Γöé Γöé Γöéinformation that will be Γöé Γöé Γöécontained by a value set item.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_SETITEMATTR ΓöéSets the attributes of the Γöé Γöé Γöéitem indicated by the row and Γöé Γöé Γöécolumn values. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVM_SETMETRICS ΓöéSets the size of each item in Γöé Γöé Γöéthe value set control, the Γöé Γöé Γöéspacing between items, or Γöé Γöé Γöéboth. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéOccurs when the user presses aΓöé Γöé Γöékey. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_PRESPARAMCHANGED ΓöéSent when a presentation Γöé Γöé Γöéparameter is set or removed Γöé Γöé Γöédynamically from a window Γöé Γöé Γöéinstance. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYWINDOWPARAMS ΓöéOccurs when an application Γöé Γöé Γöéqueries the window parameters.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETWINDOWPARAMS ΓöéOccurs when an application Γöé Γöé Γöésets or changes the window Γöé Γöé Γöéparameters. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 22. Keyboard Accelerators ΓòÉΓòÉΓòÉ A keyboard accelerator (shortcut key to the user) is a keystroke that generates a command message for an application. This chapter describes how to use keyboard accelerators in your PM applications. ΓòÉΓòÉΓòÉ 22.1. About Keyboard Accelerators ΓòÉΓòÉΓòÉ Using a keyboard accelerator has the same effect as choosing a menu item. While menus provide an easy way to learn an application's command set, accelerators provide quick access to those commands. Without accelerators, a user might generate commands by pressing the Alt key to access the menu bar, using the Arrow keys to select an item, then pressing the Enter key to choose the item. In contrast, accelerators allow the user to generate commands with a single keystroke. The following figure shows examples of accelerators. Accelerators Like menu items, accelerators can generate WM_COMMAND, WM_HELP, and WM_SYSCOMMAND messages. Although, normally, accelerators are used to generate existing commands as menu items, they also can send commands that have no menu-item equivalent. ΓòÉΓòÉΓòÉ 22.1.1. Accelerator Tables ΓòÉΓòÉΓòÉ An accelerator table contains an array of accelerators. Accelerator tables exist at two levels within the operating system: a single accelerator table for the system queue and individual accelerator tables for application windows. Accelerators in the system queue apply to all applications-for example, the F1 key always generates a WM_HELP message. Having accelerators for individual application windows ensures that an application can define its own accelerators without interfering with other applications. An accelerator for an application window can override the accelerator in the system queue. An application can modify both its own accelerator table and the system's accelerator table. The application can set and query the accelerator table for a specific window or for the entire system. For example, an application can query the system accelerator table, copy it, modify the copied data structures; and then, use the modified copy to set the system accelerator table. An application also can modify its window's accelerator table at run time to respond more appropriately to the current environment. Note: An application that modifies any accelerator table other than its own should maintain the original accelerator table; and, before terminating, restore that table. ΓòÉΓòÉΓòÉ 22.1.2. Accelerator-Table Resources ΓòÉΓòÉΓòÉ You can use accelerators in an application by creating an accelerator-table resource in a resource-definition file. Then, when the application creates a standard frame window, the application can associate that window with the resource. As specified in a resource-definition file, an accelerator table consists of a list of accelerator items, each defining the keystroke that triggers the accelerator, the command the accelerator generates, and the accelerator's style. The style specifies whether the keystroke is a virtual key, a character, or a scan code, and whether the generated message is WM_COMMAND, WM_SYSCOMMAND, or WM_HELP; WM_COMMAND is the default. ΓòÉΓòÉΓòÉ 22.1.3. Accelerator-Table Handles ΓòÉΓòÉΓòÉ Applications that use accelerator tables refer to them with a 32-bit handle. An application using this handle, by default, can make most API function calls for accelerators without having to account for the internal structures that define the accelerator table. When an application needs to dynamically create or change an accelerator table, it must use the ACCEL and ACCELTABLE data structures. ΓòÉΓòÉΓòÉ 22.1.4. Accelerator-Table Data Structures ΓòÉΓòÉΓòÉ An accelerator table consists of individual accelerator items. Each item in the table is represented by an ACCEL structure that defines the accelerator's style, keystroke, and command identifier. Typically, an application defines these aspects of an accelerator in a resource-definition file, but the ACCEL structure also can be built in memory at run time. An accelerator table is represented by an ACCELTABLE structure that specifies the number of accelerator items in the table, the code page used for the keystrokes in the accelerator items, and an array of ACCEL structures (one for each item in the table). Applications that use ACCELTABLE structures directly must allocate sufficient memory to hold all the items in the table. ΓòÉΓòÉΓòÉ 22.1.5. Accelerator-Item Styles ΓòÉΓòÉΓòÉ An accelerator item has a style that determines what combination of keys produces the accelerator and what command message is generated by the accelerator. An application can specify the following accelerator-item styles in the fs field of the ACCEL structure: Accelerator-Item Styles ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStyle ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_ALT ΓöéSpecifies that the user must hold down the Γöé Γöé ΓöéAlt key while pressing the accelerator key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_CHAR ΓöéSpecifies that the keystroke is a character Γöé Γöé Γöéthat is translated using the code page for Γöé Γöé Γöéthe accelerator table. (This is the default Γöé Γöé Γöéstyle.) Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_CONTROL ΓöéSpecifies that the user must hold down the Γöé Γöé ΓöéCtrl key while pressing the accelerator key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_HELP ΓöéSpecifies that the accelerator generates a Γöé Γöé ΓöéWM_HELP message instead of a WM_COMMAND Γöé Γöé Γöémessage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_LONEKEY ΓöéSpecifies that the user need not press Γöé Γöé Γöéanother key while the accelerator key is Γöé Γöé Γöédown. Typically, this style is used with theΓöé Γöé ΓöéAlt key to specify that simply pressing and Γöé Γöé Γöéreleasing that key triggers the accelerator. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_SCANCODE ΓöéSpecifies that the keystroke is an Γöé Γöé Γöéuntranslated scan code from the keyboard. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_SHIFT ΓöéSpecifies that the user must hold down the Γöé Γöé ΓöéShift key when pressing the accelerator key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéAF_SYSCOMMAND ΓöéSpecifies that the accelerator generates a Γöé Γöé ΓöéWM_SYSCOMMAND message instead of a WM_COMMANDΓöé Γöé Γöémessage. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéVIRTUALKEY ΓöéSpecifies that the keystroke is a virtual Γöé Γöé Γöékey-for example, the F1 function key. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 22.2. Using Keyboard Accelerators ΓòÉΓòÉΓòÉ This section explains how to perform the following tasks: o Create an accelerator-table resource. o Include an accelerator table in a frame window. o Modify an accelerator table. ΓòÉΓòÉΓòÉ 22.2.1. Creating an Accelerator-Table Resource ΓòÉΓòÉΓòÉ The following code fragment shows a typical accelerator-table resource: ACCELTABLE ID_ACCEL_RESOURCE BEGIN VK_ESC, IDM_ED_UNDO, AF_VIRTUALKEY | AF_SHIFT VK_DELETE, IDM_ED_CUT, AF_VIRTUALKEY VK_F2, IDM_ED_COPY, AF_VIRTUALKEY VK_INSERT, IDM_ED_PASTE, AF_VIRTUALKEY END This accelerator table has four accelerator items. The first one is triggered when the user presses Shift+Esc, which sends a WM_COMMAND message (the default). An accelerator table in a resource-definition file has an identifier (ID_ACCEL_RESOURCE in the previous example). You can associate an accelerator-table resource with a standard frame window by specifying the table's resource identifier as the idResources parameter of the WinCreateStdWindow function. An application can load an accelerator table resource-definition file automatically when creating a standard frame window, or it can load the resource independently and associate it with a window or with the entire system. ΓòÉΓòÉΓòÉ 22.2.2. Including an Accelerator Table in a Frame Window ΓòÉΓòÉΓòÉ You can add an accelerator table to a frame window either by using the WinSetAccelTable function or by defining an accelerator-table resource (as shown in the previous section) and creating a frame window with the FCF_ACCELTABLE frame style. The second method is shown in the following code fragment: HWND hwndFrame,hwndClient; CHAR szClassName[]="MyClass"; CHAR szTitle[]="MyWindow"; ULONG flControlStyle = FCF_SIZEBORDER | FCF_ACCELTABLE | FCF_TITLEBAR | FCF_MENU; hwndFrame = WinCreateStdWindow(HWND_DESKTOP, WS_VISIBLE, &flControlStyle, szClassName, szTitle, 0, (HMODULE)NULL, ID_MENU_RESOURCE, &hwndClient); Notice that if you set the flControlStyle parameter to the FCF_STANDARD flag, you must define an accelerator-table resource, because FCF_STANDARD includes the FCF_ACCELTABLE flag. If the window being created also has a menu, the menu resource and accelerator resource must have the same resource identifier; this is because the WinCreateStdWindow function has only one input parameter to specify the resource identifiers for menus, accelerator tables, and icons. If an application creates an accelerator table resource-definition file; then, opens a standard frame window (as shown in the preceding example), the accelerator table is installed automatically in the window's message queue, and keyboard events are translated during the normal processing of events. The application simply responds to WM_COMMAND, WM_SYSCOMMAND, and WM_HELP messages; it does not matter whether these messages come from a menu or an accelerator. An application also can add an accelerator table to a window by calling the WinSetAccelTable function with an accelerator-table handle and a frame-window handle. The application can call either the WinLoadAccelTable function to retrieve an accelerator table from a resource file or the WinCreateAccelTable function to create an accelerator table from an accelerator-table data structure in memory. ΓòÉΓòÉΓòÉ 22.2.3. Modifying an Accelerator Table ΓòÉΓòÉΓòÉ You can modify an accelerator table, for either your application windows or the system, by doing the following: 1. Retrieve the handle of the accelerator table. 2. Use that handle to copy the accelerator-table data to an application-supplied buffer. 3. Change the data in the buffer. 4. Use the changed data to create a new accelerator table. Then you can use the new accelerator-table handle to set the accelerator table, as outlined in the following list: 1. Call WinQueryAccelTable to retrieve an accelerator-table handle. 2. Call WinCopyAccelTable with a NULL buffer handle to determine how many bytes are in the table. 3. Allocate sufficient memory for the accelerator-table data. 4. Call WinCopyAccelTable, with a pointer to the allocated memory. 5. Modify the data in the buffer (assuming it has the form of an ACCELTABLE structure). 6. Call WinCreateAccelTable, passing a pointer to the buffer with the modified accelerator-table data. 7. Call WinSetAccelTable with the handle returned by WinCreateAccelTable. ΓòÉΓòÉΓòÉ 22.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions, structures, and messages used with accelerator tables: Accelerator-Table Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCopyAccelTable ΓöéUsed to get the accelerator table Γöé Γöé Γöécorresponding to an Γöé Γöé Γöéaccelerator-table handle, or to Γöé Γöé Γöédetermine the size of the Γöé Γöé Γöéaccelerator-table data. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateAccelTable ΓöéCreates an accelerator table from Γöé Γöé Γöéthe accelerator definitions in Γöé Γöé Γöémemory. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDestroyAccelTable ΓöéDestroys an accelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinLoadAccelTable ΓöéLoads an accelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryAccelTable ΓöéQueries the window or queue Γöé Γöé Γöéaccelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetAccelTable ΓöéSets the window-accelerator or Γöé Γöé Γöéqueue-accelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinTranslateAccel ΓöéTranslates a WM_CHAR message. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Accelerator-Table Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéACCEL ΓöéAccelerator structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéACCELTABLE ΓöéAccelerator-table structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Accelerator-Table Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYACCELTABLE ΓöéReturns the handle to a window's Γöé Γöé Γöéaccelerator table. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SETACCELTABLE ΓöéEstablishes the window accelerator Γöé Γöé Γöétable to be used for translation Γöé Γöé Γöéwhen the window is active. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_TRANSLATEACCEL ΓöéSent to the focus window when a Γöé Γöé ΓöéWM_CHAR message occurs. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 23. Dialog Windows ΓòÉΓòÉΓòÉ Dialog windows (also called dialog boxes) provide a high-level method for applications to display and gather information. This chapter describes the creation and use of dialog windows and message boxes in your PM applications. Note: Dialog windows, dialog boxes, and message boxes all are secondary windows to the user. ΓòÉΓòÉΓòÉ 23.1. About Dialog Windows ΓòÉΓòÉΓòÉ A dialog window is a temporary window that contains one or more control windows and, typically, is used to display messages to and gather input from the user. An application usually destroys a dialog window immediately after using it. OS/2 contains many functions and messages that help manage the control windows that make up a dialog window, thus easing the burden of maintaining complex input and output systems. ΓòÉΓòÉΓòÉ 23.1.1. Modal and Modeless Dialog Windows ΓòÉΓòÉΓòÉ Dialog windows can be modal or modeless. A modal dialog window requires that the dialog window be dismissed before the user can activate other windows in the same application. Generally, an application uses a modal dialog window to get essential information from the user before proceeding with an operation. A modeless dialog window allows the user to activate other windows in the same application without dismissing the dialog window. Both modal and modeless dialog windows allow the user to activate windows in another application before responding to the dialog window. Modal dialog windows are easier for an application to manage because they are created, perform their task, and are closed, all with a single function call. Modeless dialog windows require more attention from the application because they exist until explicitly dismissed. Modeless dialog windows provide a more flexible interface, however, by allowing the user to move to other windows in the application before responding to the dialog window. ΓòÉΓòÉΓòÉ 23.1.2. Dialog Items ΓòÉΓòÉΓòÉ A dialog item is a child window of the dialog window, which usually is a window of class WC_FRAME. The operating system provides many predefined window classes, called control windows, that you can use as dialog items. The following figure is an example. Dialog Window with Control Windows Predefined control windows include static display boxes, text-entry fields, buttons, and list boxes. You also can use customized window classes as dialog items. Dialog items are windows and, thus, can be manipulated by all window-management functions relating to size, position, and visibility. Dialog items always are owned by the dialog frame window. Most predefined control-window classes send notification messages to their owners when the user interacts with their control windows. The dialog frame window receives these notification messages and passes them to the application through the application-defined dialog procedure. ΓòÉΓòÉΓòÉ 23.1.3. Dialog-Item Groups ΓòÉΓòÉΓòÉ Items within a dialog window can be organized into dialog-item groups. When items are arranged in a group, the user can move from one item to another in the same group by using the direction keys. When the user presses a direction key, the focus will not shift to items in other groups within the dialog window. Arranging items in groups is useful for radio buttons and check boxes. Although some control types also can be displayed this way, entry-field controls cannot; they process direction keys themselves, as do MLE, value-set, container, slider, and notebook controls. The first item in a dialog-item group has the WS_GROUP window style. All subsequent items in the dialog template are considered part of that group until another item is given the WS_GROUP style, which begins a new group. The WS_TABSTOP style often is used along with the WS_GROUP style. WS_TABSTOP marks the items that can receive the focus when the user presses the Tab key. Each time the user presses the Tab key, the focus moves to the next item that has the WS_TABSTOP style. Generally, the WS_GROUP and WS_TABSTOP styles are defined together for the first item of each group in the dialog template. This makes it possible for a user to press the Tab key to move among groups of items and to use the direction keys to move among items in a group. The WS_TABSTOP style should not be used for radio buttons because the system automatically maintains a tab stop on any selected item in a radio-button group; therefore, when the Tab key is pressed in a group of radio buttons, the focus remains on the currently selected item. The WS_GROUP and WS_TABSTOP styles are also useful for preventing the user from moving to a particular button when using the keyboard. For example, if the dialog window has OK and Cancel push buttons, they should be in the same group, with the OK push button as the first item in the group. The user can press Tab to select the OK push button but not the Cancel push button. To move to the Cancel button using the keyboard, the user first must press the Tab key to move to the OK push button, and then press a direction key to move the focus to the Cancel push button. ΓòÉΓòÉΓòÉ 23.1.4. Message Boxes ΓòÉΓòÉΓòÉ Message boxes are dialog windows predefined by the system and used as a simple interface for applications, without the necessity of creating dialog-template resources or dialog procedures. An application can call the WinMessageBox function and specify the type of message box and message text. The system displays the message and waits for the user to dismiss the message box by selecting a button in the message box. The system then returns a result code to the application, indicating which button the user selected. Message boxes are best for short notification messages that require a simple acknowledgment or choice by the user. Applications do not specify a dialog procedure for message boxes so they cannot readily change the action of a message box. However, there is no need to do so, since there are many predefined message-box styles. The following figure shows a sample message box. Example of a Message Box Message boxes are always modal-either application-modal or system-modal. Application-modal (the default style) means that the user cannot activate another window in the current application before responding to the message box but can switch to another application before responding. System-modal means that the user cannot activate another window in any application before responding to the message box. A system-modal message box should be used only to display urgent error messages (running out of memory, for example). ΓòÉΓòÉΓòÉ 23.1.5. Dialog Data Structures ΓòÉΓòÉΓòÉ Each item in a dialog window is described by a DLGTITEM data structure. This structure is rarely accessed directly by an application, since system functions handle most of the manipulation of dialog items. Applications that create dialog items that are not defined as part of a dialog-template resource must create dialog-window-item structures in memory. A dialog window can have many items, so applications can use another structure, DLGTEMPLATE, to define the items. This structure consists of header information, followed by an array of dialog-window items. Applications that create dialog windows without using dialog resources must create a dialog template in memory, and, then, call the WinCreateDlg function. ΓòÉΓòÉΓòÉ 23.1.6. Dialog Resources ΓòÉΓòÉΓòÉ Most applications define dialog templates in resource files rather than constructing template data structures in memory at run time. The dialog resource file defines the size and style of the dialog-window frame and specifies each dialog item. The dimensions and position of each dialog item are specified in dialog coordinates, which are based on the size of the system font. A horizontal unit is one-fourth the average width of the characters in the system font; a vertical unit is one-eighth the average height of the characters in the system font. The origin of the dialog template is the lower-left corner of the dialog window. The operating system provides the WinMapDlgPoints function for converting dialog coordinates into window coordinates. ΓòÉΓòÉΓòÉ 23.2. Using Message Boxes and Dialog Windows ΓòÉΓòÉΓòÉ The simplest dialog window is the message box. Most message boxes present simple messages and offer the user one, two, or three responses (represented by buttons). A message box is easy to use and is appropriate when an application requires a clearly defined response to a static message. However, message boxes lack flexibility in size and placement on the screen and are limited in the choices they offer the user. Applications that require more control over size, position, and content should use regular dialog windows instead of message boxes. ΓòÉΓòÉΓòÉ 23.2.1. Creating a Message Box ΓòÉΓòÉΓòÉ There are three parts to a message box: the icon, the message, and buttons. Applications specify the icons and buttons by using message-box style constants. Message text is specified by a null-terminated string. To create a message box, the application calls the WinMessageBox function, which displays the message box and processes user input until the user selects a button in the message box. The WinMessageBox return value indicates which button the user selected. The following code fragment illustrates how to create a message box with a default Yes button, a No button, and a question-mark (?) icon. This example assumes that you have defined a string resource with the MY_MESSAGESTR_ID identifier in the resource file. UCHAR szMessageString[255]; ULONG ulResult; WinLoadString(hab, (HMODULE) NULL, MY_MESSAGESTR_ID, sizeof(szMessageString), szMessageString); ulResult = WinMessageBox(hwndFrame, /* Parent */ hwndFrame, /* Owner */ szMessageString, /* Text */ (PSZ) NULL, /* caption */ MY_MESSAGEWIN, /* Window ID */ MB_YESNO | MB_ICONQUESTION | MB_DEFBUTTON1); /* Style */ if (ulResult == MBID_YES) { /* Do yes case. */ } else { /* Do no case. */ } The WinMessageBox function returns predefined values indicating which button has been selected. These values are listed in the Presentation Manager Programming Reference. Notice that strings for message boxes should be defined as string resources to facilitate program translation for other countries. However, there is danger in using string resources in message boxes that are called in low-memory situations; loading a string resource in such situations could result in severe memory problems and cause an application to fail. One way to prevent this problem is to preload the string resource and make it nondiscardable so it will be available when the message box must be displayed. ΓòÉΓòÉΓòÉ 23.2.1.1. Creating a System-Modal Message Box ΓòÉΓòÉΓòÉ There are two levels of modality for system-modal message boxes-soft modal and hard modal. A soft-modal message box does not allow keystrokes or mouse input to reach any other window but does allow other messages, such as deactivation and timer messages, to reach other windows. A hard-modal message box does not allow any messages to reach other windows. A hard-model message box is appropriate for serious system warnings. To create a hard-modal message box, combine the MB_ICONHAND style with the MB_SYSTEMMODAL style. To create a soft-modal message box, use the MB_SYSTEMMODAL style with any style other than MB_ICONHAND. The MB_SYSTEMMODAL icon always is in memory and is available even in low-memory situations. ΓòÉΓòÉΓòÉ 23.2.2. Using a Dialog Window ΓòÉΓòÉΓòÉ When using a dialog window, an application must load the dialog window, process user input, and destroy the dialog window when the user finishes the task. The process for handling a dialog window varies, depending on whether the dialog window is modal or modeless. ΓòÉΓòÉΓòÉ 23.2.2.1. Creating a Dialog Template ΓòÉΓòÉΓòÉ The following source-code fragment creates a dialog template. Notice that the WS_GROUP and WS_TABSTOP style designations are given for the first item in each group. DLGTEMPLATE IDD_ABOUT BEGIN DIALOG "", IDD_ABOUT2, 10, 10, 150, 110, FS_DLGBORDER, 0 BEGIN CONTROL "Attributes:",100, 10, 30, 100, 70, WC_STATIC, SS_GROUPBOX | WS_VISIBLE CONTROL "Highlighted",101, 20, 80, 58, 12, WC_BUTTON, WS_GROUP | WS_TABSTOP | BS_AUTOCHECKBOX | WS_VISIBLE CONTROL "Enabled",102, 20, 60, 58, 12, WC_BUTTON, BS_AUTOCHECKBOX | WS_VISIBLE CONTROL "Checked",103, 20, 40, 58, 12, WC_BUTTON, BS_AUTOCHECKBOX | WS_VISIBLE CONTROL "Okay", DID_OK, 10, 10, 50, 14, WC_BUTTON, WS_GROUP | WS_TABSTOP | BS_PUSHBUTTON | BS_DEFAULT | WS_VISIBLE CONTROL "Cancel", DID_CANCEL, 80, 10, 50, 14, WC_BUTTON, BS_PUSHBUTTON | WS_VISIBLE END END ΓòÉΓòÉΓòÉ 23.2.2.2. Creating a Modal Dialog Window ΓòÉΓòÉΓòÉ The easiest way to use a modal dialog window is to define a dialog template in the resource file (as in the preceding section), and then, call the WinDlgBox function, specifying the dialog-window resource identifier and a pointer to the dialog procedure. WinDlgBox loads the dialog-window resource, displays the dialog window, and handles all user input until the user dismisses the dialog window. The dialog procedure receives messages when the dialog window is created (WM_INITDLG) and other messages each time the user interacts with a dialog item (enters text in entry fields or selects a button, for example). You must specify both the parent and owner windows when loading a dialog window using the WinDlgBox function. Generally, the parent window will be HWND_DESKTOP and the owner will be a client window in your application. Dialog windows typically contain buttons that send WM_COMMAND messages when selected by the user. WM_COMMAND messages passed to the WinDefDlgProc function result in the WinDismissDlg function's being called, with the window identifier of the source button as the return code (from WinDismissDlg). Dialog windows with either OK or Cancel as their only button can ignore WM_COMMAND messages, allowing them to be passed to WinDefDlgProc. WinDefDlgProc calls WinDismissDlg to dismiss the dialog window and returns the DID_OK or DID_CANCEL code. Passing WM_COMMAND messages to WinDefDlgProc means that all button presses in the dialog window dismiss the dialog window. If you want certain buttons to initiate operations without closing the dialog window, or if you want to perform some processing without closing the dialog window, handle the WM_COMMAND messages in the dialog procedure. If you handle WM_COMMAND messages in the dialog procedure, you must call WinDismissDlg to dismiss the dialog window. Your dialog procedure passes the DID_OK code to WinDismissDlg if the user selects the OK button or the DID_CANCEL code if the user selects the Cancel button. When you call WinDismissDlg or pass the WM_COMMAND message to WinDefDlgProc, the dialog window is dismissed, and the WinDlgBox function returns the value passed to WinDismissDlg. This return value identifies the button selected. An alternative to using WinDlgBox is to call the individual functions that duplicate its functionality, as shown in the following code fragment: HWND hwndDlg; ULONG ulResult; hwndDlg = WinLoadDlg(...); ulResult = WinProcessDlg(hwndDlg); WinDestroyWindow(hwndDlg); After calling the WinProcessDlg function, your dialog procedure must call WinDismissDlg to dismiss the dialog window. Although the dialog window is dismissed (hidden), it still exists. You must call the WinDestroyWindow function to destroy a dialog window if it was loaded using the WinLoadDlg function. WinDlgBox automatically destroys a dialog window before returning. If you want to manipulate individual items in a dialog window, or add a menu after loading the dialog window (but before calling WinProcessDlg), it is better to make individual calls rather than call WinDlgBox. Individual calls also are useful for querying individual dialog items-to determine the contents of an entry-field control after a dialog window is closed but before it is destroyed, for example. Destroying a dialog window also destroys any dialog-item control windows that are child windows of the dialog window. ΓòÉΓòÉΓòÉ 23.2.2.3. Creating a Modeless Dialog Window ΓòÉΓòÉΓòÉ To use a modeless dialog window in an application, create a dialog template in the resource file, just as for a modal dialog window. Modeless dialog windows share the screen equally with other frame windows. It is a good idea to give modeless dialog windows a title bar so they can be moved around the screen. The following Resource Compiler source-code fragment shows a dialog template for a dialog window with a title bar, system menu, and minimize button. DLGTEMPLATE IDD_SAMP BEGIN DIALOG "Modeless Dialog", IDD_SAMP, 80, 92, 126, 130, WS_VISIBLE | FS_DLGBORDER, FCF_TITLEBAR | FCF_SYSMENU | FCF_MINBUTTON BEGIN /* Put control-window definitions here. */ END END The application loads the dialog resource from the resource file using the WinLoadDlg function, receiving in return a window handle to the dialog window. The application treats the dialog window as if it were an ordinary window. Messages for the dialog window are dispatched through the event loop the application uses for its other windows. In fact, an application can have a modeless dialog window as its only window. The resource for a modeless dialog window is like the resource used for a modal dialog window. The difference between modal and modeless dialog windows is the way applications handle input to each. For a modal dialog, the WinDlgBox and WinProcessDlg functions handle all user input to the dialog window, preventing access to other windows in the application. For a modeless dialog window, the application does not call these functions, relying instead on a normal message loop to dispatch messages to the dialog procedure. The primary difference between a modeless dialog window and a standard frame window with child control windows is that, for a modeless dialog window, an application can define child windows for the dialog window in a dialog template, automating the process of creating the window and its child windows. The same effect can be achieved by creating a standard frame window, but then, the child control windows must be created individually. It is important that an application keep track of all open modeless dialog windows so that it can destroy all open windows before terminating. ΓòÉΓòÉΓòÉ 23.2.2.4. Initializing a Dialog Window ΓòÉΓòÉΓòÉ Generally, an application defines a dialog template in its resource file and loads the dialog window by calling the WinLoadDlg function or the WinDlgBox function (which calls WinLoadDlg). The dialog window is created as an invisible window unless the window style WS_VISIBLE is specified in the dialog template. A WM_INITDLG message is sent to the dialog procedure before WinLoadDlg returns. As each control defined in the template is created, the dialog procedure might receive various control notifications before the function returns. WinLoadDlg returns a handle to the dialog window immediately after creating a dialog window. In general, it is a good idea to define a dialog window as invisible, since this allows for optimization. For example, an experienced user might type ahead rapidly, anticipating the processing of a dialog-window command. In such a case, there is no need to display the dialog window, because the user has finished the interaction before the window can be displayed. This is how the WinProcessDlg function works-it does not display a dialog window while there still are WM_CHAR messages in the input queue; it lets these messages to be processed first. As control windows in a dialog window are created from the template, strings in the template are processed by the WinSubstituteStrings function. Any WM_SUBSTITUTESTRING messages are sent to the dialog procedure before WinLoadDlg returns. When child windows of a dialog window are created, WinSubstituteStrings is used so child windows can make substitutions in their window text. If any child-window text string contains the percent sign (%) substitution character, the length of the text string is limited to 256 characters after it is returned from the substitution. ΓòÉΓòÉΓòÉ 23.2.2.5. Adding a Menu in a Dialog Window ΓòÉΓòÉΓòÉ To create a menu bar and menus in a dialog window, an application first must load the dialog window to get a handle to the dialog-frame window. The dialog-frame window can be associated with a menu resource by calling the WinLoadMenu function. This function requires arguments that specify the menu identifier and the handle of the parent window for the menu. Finally, the dialog-frame window must incorporate the menu by sending a WM_UPDATEFRAME message to the dialog window. The following code fragment illustrates these operations: HWND hwndDialog, hwndMenu; /* Get the dialog resource. */ hwndDialog = WinLoadDlg(...); / Get the menu resource and attach it to the dialog window. */ hwndMenu = WinLoadMenu(hwndDialog, ...); /* Inform the dialog window that it has a new menu. */ WinSendMsg(hwndDialog, WM_UPDATEFRAME, (MPARAM) NULL, (MPARAM) NULL); Applications can create menus in both modal and modeless dialog windows. The preceding code fragment can be used for either type of dialog window. For a modal dialog window, your application must call the WinProcessDlg function to handle user input until the dialog window is dismissed. For a modeless dialog window, your application must call the WinShowWindow function to display the dialog window, enabling the message loop to direct messages to the dialog window. ΓòÉΓòÉΓòÉ 23.2.2.6. Creating a Dialog Procedure ΓòÉΓòÉΓòÉ The main difference between a dialog procedure and a window procedure is that a dialog procedure does not receive WM_CREATE messages. Instead, a dialog procedure receives WM_INITDLG messages, which are sent after a dialog window is created but before it is displayed. WM_INITDLG can do the same type of initialization tasks that WM_CREATE handles. For example, if a dialog window contains a list box, use WM_INITDLG to fill the list box with items. Also use this procedure to enable or disable buttons in a dialog window, depending on your application. You also can call the WinSetDlgItemText or WinSetDlgItemShort functions during dialog initialization, to set up text items that reflect the current conditions in your application. Another typical task for the WM_INITDLG message handler is centering a dialog window on the screen or within its owner window. The following code fragment illustrates how to center a dialog window on the screen using WM_INITDLG: RECTL rclScreen,rclDialog; LONG sWidth,sHeight,sBLCx,sBLCy; case WM_INITDLG: /* Center the dialog window and get the screen rectangle. */ WinQueryWindowRect(HWND_DESKTOP, &rclScreen); /* Get the dialog-window rectangle. */ WinQueryWindowRect(hwnd, &rclDialog); /* Get the dialog-window width. */ sWidth = (LONG) (rclDialog.xRight - rclDialog.xLeft); /* Get the dialog-window height. */ sHeight = (LONG) (rclDialog.yTop - rclDialog.yBottom); /* Set the horizontal coordinate of the lower-left corner. */ sBLCx = ((LONG) rclScreen.xRight - sWidth) / 2; /* Set vertical coordinate of the lower-left corner. */ sBLCy = ((LONG) rclScreen.yTop - sHeight) / 2; /* Move, size, and show the window. */ WinSetWindowPos(hwnd, HWND_TOP, sBLCx, sBLCy, 0, 0, /* Ignores size arguments */ SWP_MOVE); return 0; The dialog procedure receives notification messages from each control-window item in a dialog window whenever a user clicks an item or enters text in an entry field. Most dialog procedures wait for the user to select one or more dialog-window buttons to signal being finished with the dialog window. When the dialog procedure receives one of these messages, it calls the WinDismissDlg function, as shown in the following code fragment. The second argument to WinDismissDlg is the value returned by the WinDlgBox or WinProcessDlg functions. Generally, these functions return the identifier of the button that was pressed. MRESULT EXPENTRY SampDialogProc(HWND hwnd, ULONG ulMessage, MPARAM mp1, MPARAM mp2) { switch (ulMessage) { case WM_COMMAND: switch (SHORT1FROMMP(mp1)) { case DID_OK: /* * Final dialog-item queries, * dismiss the dialog. */ WinDismissDlg(hwnd, DID_OK); return 0; } break; } return (WinDefDlgProc(hwnd, ulMessage, mp1, mp2)); } Other dialog-window items send notification messages specific to the type of control window. Make your dialog procedure respond to notification messages from each dialog item. Pass any messages that a dialog procedure does not handle to the WinDefDlgProc function for default processing. The default dialog procedure is the same as the default frame-window procedure. The WM_COMMAND message from the OK button indicates that the user has selected the OK button and is finished with the dialog window. If the dialog window has other controls, such as entry fields or check boxes, have your dialog procedure query the contents or state of each control upon receipt of a message from the OK button. Before dismissing a dialog window, have your dialog procedure collect input from each dialog-window control before closing the dialog window. ΓòÉΓòÉΓòÉ 23.2.2.7. Manipulating Dialog Items ΓòÉΓòÉΓòÉ Dialog items are control windows and, as such, can be manipulated using standard window-management function calls. The window handle is obtained for each dialog item by calling the WinWindowFromID function and passing the window handle for the dialog window and the window identifier for the dialog item as defined in the dialog template. Include the following Resource Compiler source-code fragment in your dialog template: DLGTEMPLATE IDD_ABOUT BEGIN DIALOG "", IDD_ABOUT, 80, 92, 126, 130, FS_DLGBORDER, 0 BEGIN PUSHBUTTON "My Button", ITEMID_MYBUTTON, 37, 107, 56, 12 /* Other item definitions ... */ END END Based on this code fragment, your application will receive the button-item handle by initiating the following call to WinWindowFromID: hwndItem = WinWindowFromID(hwndDialog, ITEMID_MYBUTTON); Applications often change the contents, enabled state, or position of dialog items at run time. For example, in a dialog window that contains a list box of file names and an Open button, the Open button should be disabled until the user selects a file from the list. To do this, define the button as disabled in the dialog resource so that it is disabled when the dialog window first is displayed. At run time, the dialog procedure receives a notification message from the list box when the user selects a file. At that time, the dialog procedure should call the WinEnableWindow function to enable the Open button. Applications also can change the text in static dialog items and buttons by calling the WinSetWindowText function and using the window handle of a particular dialog item. ΓòÉΓòÉΓòÉ 23.3. Summary ΓòÉΓòÉΓòÉ Following are the OS/2 functions, structures, and messages used with dialog windows. Dialog Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinAlarm ΓöéGenerates an audible alarm. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinCreateDlg ΓöéCreates a dialog window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDefDlgProc ΓöéInvokes the default dialog Γöé Γöé Γöéprocedure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDestroyWindow ΓöéDestroys a window and its child Γöé Γöé Γöéwindows. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDismissDlg ΓöéHides the modeless dialog window, orΓöé Γöé Γöédestroys the modal dialog window, Γöé Γöé Γöéand causes the WinProcessDlg or Γöé Γöé ΓöéWinDlgBox calls to return. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDlgBox ΓöéLoads and processes a modal dialog Γöé Γöé Γöéwindow and returns the result value Γöé Γöé Γöéestablished by the WinDismissDlg Γöé Γöé Γöécall. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinEnumDlgItem ΓöéReturns the window handle of a Γöé Γöé Γöédialog item within a dialog window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinGetDlgMsg ΓöéObtains a message from the Γöé Γöé Γöéapplication's queue associated with Γöé Γöé Γöéthe specified dialog. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinLoadDlg ΓöéCreates a dialog window from the Γöé Γöé Γöédialog template Dlgid in Resource. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinMapDlgPoints ΓöéMaps points from dialog coordinates Γöé Γöé Γöéto window coordinates or from windowΓöé Γöé Γöécoordinates to dialog coordinates. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinMessageBox ΓöéCreates, displays, and operates a Γöé Γöé Γöémessage box window. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinProcessDlg ΓöéDispatches messages while a modal Γöé Γöé Γöédialog window is displayed. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryDlgItemShort ΓöéConverts the text of a dialog item Γöé Γöé Γöéinto an integer value. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryDlgItemText ΓöéQueries a text string in a dialog Γöé Γöé Γöéitem. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinQueryDlgItemTextLengtΓöéQueries the length of the text Γöé Γöé Γöéstring in a dialog item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSendDlgItemMsg ΓöéSends a message to the dialog item Γöé Γöé Γöédefined by item in the dialog windowΓöé Γöé Γöéspecified by Dlg. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetDlgItemShort ΓöéConverts an integer value into the Γöé Γöé Γöétext of a dialog item. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSetDlgItemText ΓöéSets a text string in a dialog item.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinSubstituteStrings ΓöéPerforms a substitution process on aΓöé Γöé Γöétext string, replacing specific Γöé Γöé Γöémarker characters with text suppliedΓöé Γöé Γöéby the application. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Dialog Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDLGTEMPLATE ΓöéDialog-template structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDLGITEM ΓöéDialog-item structure. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Dialog Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_CHAR ΓöéSent when a user presses a key. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_INITDLG ΓöéOccurs when a dialog box is being Γöé Γöé Γöécreated Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_QUERYDLGCODE ΓöéSent by the dialog manager to Γöé Γöé Γöéidentify the type of control, to Γöé Γöé Γöédetermine what kinds of messages theΓöé Γöé Γöécontrol understands, and to Γöé Γöé Γöédetermine whether an input message Γöé Γöé Γöémay be processed by the dialog Γöé Γöé Γöémanager or passed down to the Γöé Γöé Γöécontrol. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWM_SUBSTITUTESTRING ΓöéSent from the WinSubstituteStrings Γöé Γöé Γöécall. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 24. Font Dialog Controls ΓòÉΓòÉΓòÉ Font dialog controls provide basic functions that give users the ability to display and select from a list of: o Font family names installed on the system o Available styles for each font o Available sizes for each font o Emphasis styles available for each font. Users can view their selections, using a sample character string in a preview area, and interact with a modal or modeless font dialog. This chapter explains how font dialog controls can be extended to meet the requirements of PM applications. ΓòÉΓòÉΓòÉ 24.1. About the Font Dialog Control ΓòÉΓòÉΓòÉ In the font dialog control, family face is defined as the name of the typeface. The following figure is an example of a font dialog. Font Dialog Courier, Times New Roman, and Helvetica are examples of commonly used family faces. Type styles include normal, bold, italic, and bold italic. Size is the point size, or vertical measurement, of the type. Font emphasis styles include outline, underline, and strikeout. ΓòÉΓòÉΓòÉ 24.2. Creating a Font Dialog ΓòÉΓòÉΓòÉ To present a font dialog to users, your application must do the following: 1. Allocate storage for a FONTDLG structure and set all fields to NULL. 2. Initialize the fields in the FONTDLG structure. The application must: a. Set the cbSize field to the size of the structure. b. Set either the hpsScreen or the hpsPrinter presentation space field, or both. You must have a valid presentation space from which to query fonts. c. Pass the pointer to a buffer in which to return the family name selected (pszFamilyname) and the size of the buffer (usFamilyBufLen). If the application requires a default font, pass the family name of the font in this buffer. The application can choose to set the following: a. An application-specific title. Pass the pointer to a null-terminated string in the pszTitle field. b. An application-specific preview string. Pass the pointer to a null-terminated string in the pszPreview field. c. Application-specific available font sizes for outline fonts. Pass the pointer to a null-terminated string containing point sizes, separated by spaces in the pszPtSizeList field. d. A custom dialog procedure to provide application-specific function. Pass the pointer to a window procedure in the pfnDlgProc field. e. Set the appropriate FNTS_* flags in the fl field to customize the dialog style. See the description of this field for the FONTDLG structure in the OS/2 2.0 Programming Reference for a list of the flags you can specify. f. Set the FNTF_NOVIEWPRINTERFONTS or FNTF_NOVIEWSCREENFONTS flags to customize the dialog style when working with printer fonts in the flFlags field. These filter flags should be initialized only when both the hpsScreen and the hpsPrinter presentation space fields are non-NULL. g. Pass the initial position of the dialog in the x and y fields. 3. Initialize the FONTDLG structure with any values that users should see when they invoke the dialog for the first time. For example, you can: a. Pass the characteristics of the default font in the usWeight, usWidth, flType, and sNominalPointSize fields. b. Pass any display options of the default font in the flStyle field. c. Pass the color options for displaying the font sample in the clrFore and clrBack fields. 4. Invoke the font dialog. Call the WinFontDlg function and pass the dialog's parent window handle, owner window handle, and a pointer to the initialized FONTDLG structure. 5. Check the return value from the WinFontDlg function. If it is successful, the selected font can be used by the application. The information returned in the fAttrs field of the FONTDLG structure is used. ΓòÉΓòÉΓòÉ 24.3. Graphical User Interface Support for the Font Dialog ΓòÉΓòÉΓòÉ This section contains information about the graphical user interface support. ΓòÉΓòÉΓòÉ 24.3.1. Name Field ΓòÉΓòÉΓòÉ The Name field is a drop-down list that displays a font family name. When the font dialog is invoked, the value displayed in this field is either an application-supplied family name or the default system font. When users select a family name from the drop-down list, the Name field display is refreshed with the selected family name. The preview area is updated to show the sample character string in the selected family face, using the font style, size, and emphasis currently in effect. ΓòÉΓòÉΓòÉ 24.3.2. Style Field ΓòÉΓòÉΓòÉ The Style field is a drop-down list that displays a font style. When the font dialog is invoked, the value displayed in this field is either an application-specified font style or the system default. When users select a font style from the drop-down list, the Style field display is refreshed with the selected style name. The preview area is updated to show the sample character string in the selected font style, using the family name, size, and emphasis currently in effect. ΓòÉΓòÉΓòÉ 24.3.3. Size Field ΓòÉΓòÉΓòÉ The Size field is a drop-down combination box that displays available font sizes. Users can display and select from a list of available sizes for a font, or they can type a font size directly into the entry field. When users select a font size from the drop-down list, the Size field display is refreshed with the selected size. The preview area is updated to show the character string in the selected font size, using the family name, font style, and emphasis currently in effect. The font sizes included in the drop-down list are dependent on the character definition of the font. For image or raster fonts, all available sizes are listed. For outline fonts, the default sizes are 8, 10, 12, 14, 18, and 24 points. If required, the application can specify the available sizes for outline fonts. When users type a font size in the entry field, the preview area is updated immediately. The Size field will accept a fixed point number, such as 24.25, with up to four places saved after the decimal. ΓòÉΓòÉΓòÉ 24.3.4. Emphasis Group Box ΓòÉΓòÉΓòÉ The Emphasis group box is a multiple-selection field that contains a list of emphasis styles (Outline, Underline, Strikeout) available for each font. When users select an emphasis style, the preview area is updated immediately. The Outline selection is not available for image fonts. ΓòÉΓòÉΓòÉ 24.3.5. Preview Area ΓòÉΓòÉΓòÉ The Preview area enables users to view their font family, style, size and emphasis selections as they make them. It contains a sample character string that is defined by the application. The default character string is abcdABCD. The Preview area displays font sizes as large as 48 points. As the size of the font increases, the sample displayed is clipped by the borders of the area. ΓòÉΓòÉΓòÉ 24.3.6. Filter Check Box ΓòÉΓòÉΓòÉ The Filter check box enables users to limit the font family name drop-down list to select from fonts that are displayable only, printable only, or a merged list. The initial setting of the Filter check box is specified by the application. ΓòÉΓòÉΓòÉ 24.3.7. Standard Push button and Default Action ΓòÉΓòÉΓòÉ The dialog can be dismissed with either the OK or Cancel push buttons. ΓòÉΓòÉΓòÉ 24.4. Customizing the Font Dialog ΓòÉΓòÉΓòÉ You can create a font dialog by customizing the font dialog control, using the minimum set of standard controls and adding any controls of your own design. Specify a standard control by including a control of the same class, ID, and style as in the font dialog. The minimum set of controls required for the font dialog are: DID_NAME, DID_STYLE, DID_DISPLAY_FILTER, DID_PRINTER_FILTER, DID_SIZE, DID_SAMPLE, DID_OUTLINE, DID_UNDERSCORE, DID_STRIKEOUT, DID_OK_BUTTON, DID_CANCEL_BUTTON. Even if your dialog does not use all of the required controls, you must include them. You can make the unused controls invisible so that your application users are not confused. ΓòÉΓòÉΓòÉ 24.5. Summary ΓòÉΓòÉΓòÉ The following tables describe the OS/2 structures, messages, functions, and controls in the standard font dialog: Font Dialog Structures ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéStructure Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFONTDLG ΓöéFont-dialog structure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéSTYLECHANGE ΓöéStyle-change structure returned by Γöé Γöé Γöéthe FNTM_STYLECHANGED message. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Font Dialog Messages ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéMessage Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFNTM_FACENAMECHANGED ΓöéNotifies the subclassing applicationΓöé Γöé Γöéwhenever the font family name is Γöé Γöé Γöéchanged by the user. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFNTM_FILTERLIST ΓöéSent whenever the font dialog is Γöé Γöé Γöépreparing to add a font family name,Γöé Γöé Γöéfont style type, or point size entryΓöé Γöé Γöéto the combination box fields that Γöé Γöé Γöécontain these parameters. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFNTM_POINTSIZECHANGED ΓöéNotifies subclassing applications Γöé Γöé Γöéwhen the point size of the font is Γöé Γöé Γöéchanged by the user. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFNTM_STYLECHANGED ΓöéNotifies subclassing applications Γöé Γöé Γöéwhen the user changes any of the Γöé Γöé Γöéattributes in the STYLECHANGE Γöé Γöé Γöéstructure. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéFNTM_UPDATEPREVIEW ΓöéNotifies subclassing applications Γöé Γöé Γöébefore the preview window is Γöé Γöé Γöéupdated. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Font Dialog Functions ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéFunction Name ΓöéDescription Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinDefFontDlgProc ΓöéThe default dialog procedure for theΓöé Γöé Γöéfont dialog. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéWinFontDlg ΓöéAllows the user to select a font. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ Standard Font Dialog Controls ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéControl Name ΓöéID ΓöéClass/Style ΓöéRemarks Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_OK_BUTTON ΓöéDID_OK ΓöéWC_BUTTON, ΓöéButton Γöé Γöé Γöé ΓöéBS_PUSHBUTTON| Γöécontrol. UsedΓöé Γöé Γöé ΓöéBS_DEFAULT| Γöéas an OK pushΓöé Γöé Γöé ΓöéWS_GROUP| Γöébutton. Γöé Γöé Γöé ΓöéWS_TABSTOP| Γöé Γöé Γöé Γöé ΓöéWS_VISIBLE Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_CANCEL_BUTTON ΓöéDID_CANCELΓöéWC_BUTTON, ΓöéButton Γöé Γöé Γöé ΓöéBS_PUSHBUTTON| Γöécontrol. UsedΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéas a Cancel Γöé Γöé Γöé Γöé Γöépush button. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_FONT_DIALOG Γöé300 ΓöéDIALOG, ΓöéDialog Γöé Γöé Γöé ΓöéFS_NOBYTEALIGN| Γöécontrol ID. Γöé Γöé Γöé ΓöéFS_DLGBORDER| Γöé Γöé Γöé Γöé ΓöéFS_BORDER| Γöé Γöé Γöé Γöé ΓöéWS_CLIPSIBLINGS| Γöé Γöé Γöé Γöé ΓöéWS_SAVEBITS, Γöé Γöé Γöé Γöé ΓöéFCF_SYSMENU| Γöé Γöé Γöé Γöé ΓöéFCF_TITLEBAR Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_NAME Γöé301 ΓöéWC_COMBOBOX, ΓöéCombination Γöé Γöé Γöé ΓöéCBS_DROPDOWNLIST| Γöébox control. Γöé Γöé Γöé ΓöéWS_TABSTOP| ΓöéUsed to Γöé Γöé Γöé ΓöéWS_VISIBLE Γöédisplay and Γöé Γöé Γöé Γöé Γöéselect font Γöé Γöé Γöé Γöé Γöéfamily names.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_STYLE Γöé302 ΓöéWC_COMBOBOX, ΓöéCombination Γöé Γöé Γöé ΓöéCBS_DROPDOWNLIST| Γöébox control. Γöé Γöé Γöé ΓöéWS_TABSTOP| ΓöéUsed to Γöé Γöé Γöé ΓöéWS_VISIBLE Γöédisplay and Γöé Γöé Γöé Γöé Γöéselect font Γöé Γöé Γöé Γöé Γöéstyle names. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_DISPLAY_FILTER Γöé303 ΓöéWC_BUTTON, ΓöéButton Γöé Γöé Γöé ΓöéBS_AUTOCHECKBOX| Γöécontrol. UsedΓöé Γöé Γöé ΓöéWS_TABSTOP| Γöéto filter theΓöé Γöé Γöé ΓöéWS_GROUP| ΓöéFont Name Γöé Γöé Γöé ΓöéWS_VISIBLE Γöéfield. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_PRINTER_FILTER Γöé304 ΓöéWC_BUTTON, ΓöéButton Γöé Γöé Γöé ΓöéBS_AUTOCHECKBOX| Γöécontrol. UsedΓöé Γöé Γöé ΓöéWS_TABSTOP| Γöéto filter theΓöé Γöé Γöé ΓöéWS_VISIBLE ΓöéFont Name Γöé Γöé Γöé Γöé Γöéfield. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_SIZE Γöé305 ΓöéWC_COMBOBOX ΓöéCombination Γöé Γöé Γöé ΓöéCBS_DROPDOWN| Γöébox control. Γöé Γöé Γöé ΓöéWS_TABSTOP| ΓöéUsed to Γöé Γöé Γöé ΓöéWS_VISIBLE Γöédisplay, Γöé Γöé Γöé Γöé Γöéselect, and Γöé Γöé Γöé Γöé Γöéenter the Γöé Γöé Γöé Γöé Γöétype size of Γöé Γöé Γöé Γöé Γöéthe selected Γöé Γöé Γöé Γöé Γöéfont. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_SAMPLE Γöé306 ΓöéWC_STATIC, ΓöéStatic text Γöé Γöé Γöé ΓöéSS_TEXT| Γöécontrol. UsedΓöé Γöé Γöé ΓöéDT_CENTER| Γöéto display Γöé Γöé Γöé ΓöéDT_VCENTER| Γöéthe preview Γöé Γöé Γöé ΓöéWS_GROUP| Γöéstring in theΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéselected Γöé Γöé Γöé Γöé Γöéfont. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_OUTLINE Γöé307 ΓöéWC_BUTTON, ΓöéCheck box Γöé Γöé Γöé ΓöéBS_AUTOCHECKBOX| Γöécontrol. UsedΓöé Γöé Γöé ΓöéWS_TABSTOP| Γöéto select theΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéoutline Γöé Γöé Γöé Γöé Γöéemphasis of Γöé Γöé Γöé Γöé Γöéthe selected Γöé Γöé Γöé Γöé Γöéfont. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_UNDERSCORE Γöé308 ΓöéWC_BUTTON, ΓöéCheck box Γöé Γöé Γöé ΓöéBS_AUTOCHECKBOX| Γöécontrol. UsedΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéto select theΓöé Γöé Γöé Γöé Γöéunderscore Γöé Γöé Γöé Γöé Γöéemphasis of Γöé Γöé Γöé Γöé Γöéthe selected Γöé Γöé Γöé Γöé Γöéfont. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_STRIKEOUT Γöé309 ΓöéWC_BUTTON, ΓöéCheck box Γöé Γöé Γöé ΓöéBS_AUTOCHECKBOX| Γöécontrol. UsedΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéto select Γöé Γöé Γöé Γöé Γöéstrikeout Γöé Γöé Γöé Γöé Γöéemphasis of Γöé Γöé Γöé Γöé Γöéthe selected Γöé Γöé Γöé Γöé Γöéfont. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_HELP_BUTTON Γöé310 ΓöéWC_BUTTON, ΓöéButton Γöé Γöé Γöé ΓöéBS_PUSHBUTTON| Γöécontrol. UsedΓöé Γöé Γöé ΓöéBS_HELP| Γöéto request Γöé Γöé Γöé ΓöéBS_NOPOINTERFOCUS|Γöéhelp from theΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéapplication. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_APPLY_BUTTON Γöé311 ΓöéWC_BUTTON, ΓöéButton Γöé Γöé Γöé ΓöéBS_PUSHBUTTON| Γöécontrol Γöé Γöé Γöé ΓöéWS_VISIBLE Γöéprovided by Γöé Γöé Γöé Γöé Γöéthe Γöé Γöé Γöé Γöé Γöéapplication. Γöé Γöé Γöé Γöé ΓöéUsed as an Γöé Γöé Γöé Γöé ΓöéApply push Γöé Γöé Γöé Γöé Γöébutton in Γöé Γöé Γöé Γöé Γöémodeless Γöé Γöé Γöé Γöé Γöéapplications.Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_RESET_BUTTON Γöé312 ΓöéWC_BUTTON, ΓöéButton Γöé Γöé Γöé ΓöéBS_PUSHBUTTON| Γöécontrol Γöé Γöé Γöé ΓöéWS_VISIBLE Γöéprovided by Γöé Γöé Γöé Γöé Γöéthe Γöé Γöé Γöé Γöé Γöéapplication. Γöé Γöé Γöé Γöé ΓöéUsed as a Γöé Γöé Γöé Γöé ΓöéReset push Γöé Γöé Γöé Γöé Γöébutton. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_NAME_PREFIX Γöé313 ΓöéWC_STATIC, ΓöéStatic text Γöé Γöé Γöé ΓöéSS_TEXT| DT_LEFT| Γöécontrol. Γöé Γöé Γöé ΓöéDT_TOP| WS_GROUP| ΓöéLabel for theΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéfont Family Γöé Γöé Γöé Γöé ΓöéName field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_STYLE_PREFIX Γöé314 ΓöéWC_STATIC, ΓöéStatic text Γöé Γöé Γöé ΓöéSS_TEXT| DT_LEFT| Γöécontrol. Γöé Γöé Γöé ΓöéDT_TOP| WS_GROUP| ΓöéLabel for theΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéfont Style Γöé Γöé Γöé Γöé ΓöéName field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_SIZE_PREFIX Γöé315 ΓöéWC_STATIC, ΓöéStatic text Γöé Γöé Γöé ΓöéSS_TEXT| DT_LEFT| Γöécontrol. Γöé Γöé Γöé ΓöéDT_TOP| WS_GROUP| ΓöéLabel for theΓöé Γöé Γöé ΓöéWS_VISIBLE Γöéfont Type Γöé Γöé Γöé Γöé ΓöéSize field. Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_SAMPLE_GROUPBOX Γöé316 ΓöéWC_STATIC, ΓöéGroup box Γöé Γöé Γöé ΓöéSS_GROUPBOX| Γöéaround a Γöé Γöé Γöé ΓöéWS_GROUP| Γöésample field.Γöé Γöé Γöé ΓöéWS_VISIBLE Γöé Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDID_EMPHASIS_GROUPBOXΓöé317 ΓöéWC_STATIC, ΓöéGroup box Γöé Γöé Γöé ΓöéSS_GROUPBOX| Γöéaround the Γöé Γöé Γöé ΓöéWS_GROUP| Γöéemphasis Γöé Γöé Γöé ΓöéWS_VISIBLE Γöécheck boxes. Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 25. File Dialog Controls ΓòÉΓòÉΓòÉ File dialog controls provide basic functions that enable users to do the following: o Display and select from a list of drives, directories, and files. o Enter a file name directly. o Filter the file names before they are displayed. o Display active network connections. o Specify .TYPE EA extended attributes. o Interact with a single-selection or multiple-selection file dialog. o Interact with a modal or modeless file dialog. These basic functions can be extended to meet the requirements of PM applications. ΓòÉΓòÉΓòÉ 25.1. About File Dialogs ΓòÉΓòÉΓòÉ The file dialog control enables you to implement Open or SaveAs dialogs. The following figures illustrate these two dialogs. Open Dialog SaveAs Dialog ΓòÉΓòÉΓòÉ 25.2. Creating a File Dialog ΓòÉΓòÉΓòÉ To present a file dialog to users, your application must do the following: 1. Allocate storage for a FILEDLG structure and set all fields to NULL. 2. Initialize the fields in the FILEDLG structure. The application must do the following: a. Set the cbSize field to the size of the structure. b. Set the fl field to indicate the type of dialog. You must set the FDS_OPEN_DIALOG or FDS_SAVEAS_DIALOG flags. The application can set the following: a. An application-specific title. Pass the pointer to a null-terminated string in the pszTitle field. b. Application-specific text for the OK push button. Pass the pointer to a null-terminated string in the pszOKButton field. c. Specify a custom dialog procedure to provide application-specific function. Pass the pointer to a window procedure in the pfnDlgProc field. d. Set other FDS_* flags in the fl field to customize the dialog style. See the description of this field for the FILEDLG structure in the OS/2 2.0 Programming Reference for a list of the flags you can specify. e. Pass the initial position of the dialog in the x and y fields. 3. Initialize the FILEDLG structure with any values that users should see when they invoke the dialog for the first time. For example, you can: