OS/2 Shareware BBS: 10 Tools/10-Tools.zip/VSCPPv4.zip/VACPP/IBMCPP/HELP/CPPVBHDI.INF

OS/2 Help File | 1995-05-10 | 1MB | 8,846 lines

ΓòÉΓòÉΓòÉ <hidden> About this Information ΓòÉΓòÉΓòÉ

The How Do I... information provides solutions to common tasks that you would
perform with the various components of VisualAge C++. Before you begin to use
this information, it would be helpful to understand how to navigate through it:

     Use the Contents and Index facilities to locate topics.
     Use the Search facility to search the text of this document.
     Use hypertext links to acquire related information on the current topic.
      Hypertext links appear in a different color (which you can customize
      using the OS/2 Scheme Palette). For example, below there are two lists of
      hypertext links. By double-clicking on the text of the link or by
      pressing Enter on a highlighted link, you will open a panel of related
      information. To shift the focus to other links using the keyboard, use
      the Tab key.

 For more information on using this help facility, see:

     How to Use the Contents
     How to Obtain Additional Information
     How to Access and Use IPF Facilities

 For more information, see:

     Other Information You Might Find Helpful
     Communicating Your Comments to IBM
     Notices
     Trademarks


ΓòÉΓòÉΓòÉ <hidden> How to Use the Contents ΓòÉΓòÉΓòÉ

The Contents window is the first to appear. Some topics have a plus ( ) icon
beside them. This icon indicates that additional topics are available.

To expand the Contents if you are using a mouse, click on the plus ( ) icon. If
you are using the keyboard, use the Up or Down Arrow key to highlight the
topic, and press the plus (+) key. To see additional topics for a heading with
a plus ( ) icon, click on the icon or highlight that topic and press the plus
(+) key.

To view a topic, double-click on the topic (or press the Up or Down Arrow key
to highlight the topic, and then press the Enter key).


ΓòÉΓòÉΓòÉ <hidden> How to Obtain Additional Information ΓòÉΓòÉΓòÉ

After you select a topic, the information for that topic appears in a window.
Highlighted words or phrases indicate that additional information is available.
Certain words and phrases are highlighted in a different color from the
surrounding text. These are called hypertext terms.

If you are using a mouse, double-click on the highlighted word. If you are
using a keyboard, press the Tab key to move to the highlighted word, and then
press the Enter key. Additional information then appears in a window.


ΓòÉΓòÉΓòÉ <hidden> How to Access and Use IPF Facilities ΓòÉΓòÉΓòÉ

Several choices are available for managing the information presented in this
document. There are three PullDown menus: the Services menu, the Options menu,
and the Help menu.

The actions that are selectable from the Services menu operate on the active
window currently displayed on the screen. These actions include the following:

 Placing Bookmarks
   You can set a placeholder so you can retrieve information of interest to
   you.

 Searching for Information
   You can find occurrences of a word or phrase in the current topic, selected
   topics, or all topics.

 Printing Information
   You can print one or more topics. You can also print a set of topics by
   first marking the topics in the Contents list.

 Copying Information to a File
   You can copy a topic that you are viewing to the System Clipboard or to a
   file that you can edit. This method is particularly useful for copying
   syntax definitions and program samples into the application that you are
   developing.

 Using the actions that are selectable from the Options menu, you can change
 the way your Contents list is displayed. To expand the Contents and show all
 levels for all topics, choose Expand all from the Options PullDown menu. You
 can also press the Ctrl, Shift and * keys together.

 The actions that are selectable from the Help menu allow you to select
 different types of help information.

 For information about any of the menu choices, highlight the choice in the
 menu and press F1.


ΓòÉΓòÉΓòÉ <hidden> Placing Bookmarks ΓòÉΓòÉΓòÉ

When you place a bookmark on a topic, it is added to a list of bookmarks you
have previously set.  You can view the list, and you can remove one or all
bookmarks from the list.  If you have not set any bookmarks, the list is empty.

To set a bookmark, do the following:

   1. Select a topic from the Contents.
   2. When that topic appears, select the Bookmark option from the Services
      menu.
   3. If you want to change the name used for the bookmark, type the new name
      in the field.
   4. Click on the Place radio button (or press the Up or Down Arrow key to
      select it).
   5. Click on OK (or select it and press Enter). The bookmark is then added to
      the bookmark list.


ΓòÉΓòÉΓòÉ <hidden> Searching for Information ΓòÉΓòÉΓòÉ

You can specify a word or phrase to be searched.  You can also limit the search
to a set of topics by first marking the topics in the Contents list.

To search for a word or phrase in all topics, do the following:

   1. Select the Search option from the Services menu.
   2. Type the word or words to be searched for.
   3. Click on All sections (or press the Up or Down Arrow keys to select it).
   4. Click on Search (or select it and press Enter) to begin the search.
   5. The list of topics where the word or phrase appears is displayed.


ΓòÉΓòÉΓòÉ <hidden> Printing Information ΓòÉΓòÉΓòÉ

You can print one or more topics, the index, or the table of contents.  Make
sure that your printer is connected to the serial port, configured correctly,
and ready for input. To print:

   1. Select Print from the Services menu.
   2. Select what you want to print. Note that the This section and Marked
      sections choices are only available if you are viewing a topic or if you
      have marked topics, respectively.  To mark topics in the table of
      contents, press the Ctrl key and click on the topics, or use the arrow
      keys.
   3. Select Print to print what you've chosen on your printer.


ΓòÉΓòÉΓòÉ <hidden> Copying Information to a File ΓòÉΓòÉΓòÉ

You can copy a topic that you are viewing in two ways:

     Copy copies the topic that you are viewing into the System Clipboard. If
      you are using a Presentation Manager (PM) editor (for example, the
      Enhanced Editor) that copies or cuts (or both) to the System Clipboard,
      and pastes to the System Clipboard, you can easily add the copied
      information to your program source module.

     Copy to file copies the topic that you are viewing into a temporary file
      named TEXT.TMP. You can later edit that file by using any editor.
      TEXT.TMP is placed in the directory where your viewable document resides.

 To copy a topic, do the following:

   1. Expand the Contents list and select a topic.
   2. When the topic appears, select Copy to file from the Services menu.
   3. The system puts the text pertaining to that topic into the temporary file
      TEXT.TMP.


ΓòÉΓòÉΓòÉ <hidden> Other Information You Might Find Helpful ΓòÉΓòÉΓòÉ

The VisualAge C++ provides a number of online guides and references that we
hope you'll find helpful as you develop applications. This information
includes:

     User's Guide information provides conceptual and usage information,
     Reference information is organized for quick access, and
     How Do I... information gives you specific instructions for performing
      common tasks.

 You can get to this online information from the Information folder inside the
 main product folder. You can also get to it from the Help menu in any of the
 components of the product.


ΓòÉΓòÉΓòÉ <hidden> Communicating Your Comments to IBM ΓòÉΓòÉΓòÉ

If there is something you like, or dislike, about this document, please let us
know. You can use one of the methods listed below to send your comments to IBM.
Please be sure to include the complete title of the publication that you are
commenting on. For example, you would refer to the How Do I... information for
the Browser as:
  VisualAge C++ Browser: How Do I... for OS/2.

The comments you send should only pertain to the information in this document
and its presentation. To request additional publications or to ask questions or
make comments about the functions of IBM products or systems, you should talk
to your IBM representative or your authorized IBM remarketer.

When you send comments to IBM, you grant IBM a nonexclusive right to use or
distribute your comments in any way it believes appropriate without incurring
any obligation to you.

You can send your comments to IBM in the following ways:

     By mail to the following address:

            IBM Canada Ltd. Laboratory
            Information Development
            2G/345/1150/TOR
            1150 EGLINTON AVENUE EAST
            NORTH YORK, ONTARIO
            CANADA M3C 1H7

     By FAX to the following number:

        -  United States and Canada: [phone]
        -  Other countries ([phone]

     By electronic mail to one of the following IDs.  Be sure to include your
      entire network address if you wish to get a reply.

        -  Internet: [e-mail]
        -  IBMLink: toribm(torrcf)
        -  IBM/PROFS: torolab4(torrcf)
        -  IBMMAIL: ibmmail(caibmwt9)


ΓòÉΓòÉΓòÉ <hidden> Notices ΓòÉΓòÉΓòÉ

Copyright International Business Machines Corporation, 1995. All rights
reserved.

Note to U.S. Government Users - Documentation related to restricted rights -
Use, duplication, or disclosure is subject to restrictions set forth in GSA ADP
Schedule Contract with IBM Corp.

This edition applies to Version 3.0 of IBM VisualAge C++ for OS/2 (30H1664,
30H1665, 30H1666) and to all subsequent releases and modifications until
otherwise indicated in new editions.  Make sure you are using the correct
edition for the level of the product.

This publication could include technical inaccuracies or typographical errors.
Changes are periodically made to the information herein; any such changes will
be reported in subsequent revisions.

Requests for publications and for technical information about IBM products
should be made to your IBM Authorized Dealer or your IBM Marketing
Representative.

When you send information to IBM, you grant IBM a nonexclusive right to use or
distribute the information in any ways it believes appropriate without
incurring any obligation to you.

Any reference to an IBM licensed program in this publication is not intended to
state or imply that only IBM's licensed program may be used. Any functionally
equivalent product, program, or service that does not infringe any of IBM's
intellectual property rights may be used instead of the IBM product, program,
or service. Evaluation and verification of operation in conjunction with other
products, except  those expressly designated by IBM, is the user's
responsibility.

IBM may have patents or pending patent applications covering subject matter in
this document.  The furnishing of this document does not give you any license
to these patents.  You can send license inquiries, in writing, to the IBM
Director of Licensing. IBM Corporation, 500 Columbus Avenue, Thornwood, NY,
10594, USA.

This publication contains examples of data and reports used in daily business
operations. To illustrate them as completely as possible, the examples include
the names of individuals, companies, brands, and products. All of these names
are fictitious and any similarity to the names and addresses used by an actual
business enterprise is entirely coincidental.


ΓòÉΓòÉΓòÉ <hidden> Trademarks and Service Marks ΓòÉΓòÉΓòÉ

The following terms used in this publication are trademarks or service marks of
IBM Corporation in the United States or other countries:

 C/2                      C Set/2
 C Set ++                 Common User Access
 CUA                      IBM
 Operating System/2       OS/2
 Personal System/2        Presentation Manager
 PS/2                     VisualAge
 WorkFrame/2

 Other company, product, and service names, which may be denoted by a double
 asterisk(**), may be trademarks or service marks of others.


ΓòÉΓòÉΓòÉ 1. ...Create a simple Visual Builder application ΓòÉΓòÉΓòÉ

Creating the To-Do List application consists of the following steps:

     Starting Visual Builder for the To-Do List application

     Creating a new visual part for the To-Do List application

     Placing parts in the application window

     Resizing and aligning the parts

     Connecting the parts

     Generating the C++ code for your application

     Building the application

     Running the application

     Exiting the Composition Editor and Visual Builder


ΓòÉΓòÉΓòÉ 1.1. Start Visual Builder for the To-Do List application ΓòÉΓòÉΓòÉ

Before you create the To-Do List application, start Visual Builder. For this
sample application, start Visual Builder from the Tools folder, as follows:

   1. Double-click on the VisualAge C++ folder icon on your desktop.

      The VisualAge C++ folder opens.

   2. Double-click on the Tools folder icon.

      The Tools folder opens.

   3. Double-click on the Visual Builder icon.

      Visual Builder displays the Visual Builder window, as shown in the
      following figure.

 Now it is time to create a new visual part for the To-Do List application.


ΓòÉΓòÉΓòÉ 1.2. Create a new visual part for the To-Do List application ΓòÉΓòÉΓòÉ

The next thing to do when creating the To-Do List application is to create the
main part, a new visual part, as follows:

   1. Select PartNew.

      Visual Builder displays the Part - New window, as shown in the following
      figure:

      The Part - New window provides the following fields in which you can
      enter information about your part:

          The Class name field, where you enter the name of your part. Each
           composite part must have a name.

           For the To-Do List application, enter the following:

                      ToDoList

          The Description field, where you enter a description of your part.

           For this example, enter the following:

                      The To-Do List application

          The File name field, where you enter the name of the .vbb file in
           which you want Visual Builder to store your part.

           For this example, you can either leave this field blank or enter the
           following:

                      ToDoList.vbb

           This causes Visual Builder to store the ToDoList part in a file
           named todolist.vbb. If you leave this field blank, Visual Builder
           uses the part name as the name of the .vbb file by default, so the
           result is the same.

          The Part type field, where you indicate the type of part. This field
           initially contains Visual part. However, you can specify a different
           type of part to create by selecting one from the field's drop-down
           list box.

           For this example, do not select a different part type because you
           want to create a visual part for the To-Do List application.

          The Base class field, where you specify the class that you want to
           be the base class of the part that you are creating. The base class
           is the part that part you are creating inherits attributes, events,
           and actions from. The Base class field contains the default base
           class name of IFrameWindow, which Visual Builder uses when you
           specify that you want to create a new visual part.

           For this example, leave IFrameWindow as the base class.

   2. Select the Open push button to create a visual part named ToDoList whose
      parent is IFrameWindow. This causes Visual Builder to display the
      Composition Editor.

 If you look back at the Visual Builder window, you see that the file
 todolist.vbb is now included in the list of loaded files. This file was
 created for you when you selected the Open push button in the Part - New
 window.

 Before you place any parts in the application window, first edit its title.

 Changing the title of the To-Do List application window

 The new visual part that you just created contains an IFrameWindow* part. This
 will be the To-Do List application window. Change the title of this window by
 doing the following:

   1. Hold down the Alt key.

   2. Click on the title bar with mouse button 1.

   3. Type the new title text, such as To-Do List.

   4. Press Shift+Enter after you have changed the window title.


ΓòÉΓòÉΓòÉ 1.3. Place parts in the application window ΓòÉΓòÉΓòÉ

Now that you have created your new visual part and edited the title of the
application window, it is time to place the other parts of the To-Do List
application in the application window.

Placing a static text part in the window

The To-Do List application needs two static text parts. Follow these steps to
place the first static text part in the To-Do List application window:

   1. Select , the Data entry category, from the row of icons on the left-hand
      side of the parts palette.

   2. Select , the IStaticText* icon, from the row of icons on the right-hand
      side of the parts palette.

      When you move the mouse pointer over the free-form surface, you see that
      it has changed to crosshairs. This means the mouse pointer is loaded with
      the IStaticText* part.

   3. Place the crosshairs in the upper-left corner of the To-Do List
      application window's client area and click mouse button 1.

      A static text part is placed in the window.

   4. Change the text of the static text part to To-do item. Use the same
      method for changing text that you learned previously when you changed the
      title of the To-Do List application window.

 Placing an entry field in the window

 The To-Do List application needs an entry field part. Follow these steps to
 place an entry field part in the To-Do List application window:

   1. Select , the Data entry category, from the row of icons on the left-hand
      side of the parts palette.

   2. Select , the IEntryField* icon, from the row of icons on the right-hand
      side of the parts palette.

   3. Place the crosshairs beneath the first static text part and click mouse
      button 1.

      The entry field part is placed beneath the static text part.

 Placing another static text part in the window

 The To-Do List application needs another static text part. Follow these steps
 to place and modify this part:

   1. Place the second static text part in the To-Do List application window.
      Use the same method for placing a static text part that you learned
      previously when you placed the first static text part in the To-Do List
      application window.

   2. Change the text of the static text part to To-do list. Use the same
      method for changing text that you learned when you changed the title of
      the To-Do List application window.

 Placing a list box in the window

 Because the to-do list is to consist of a list of text strings, you want to
 store that list in an IListBox* part. Follow these steps to place a list box
 part in the To-Do List application window:

   1. Select , the Lists category, from the row of icons on the left-hand side
      of the parts palette.

   2. Select , the IListBox* icon, from the row of icons that Visual Builder
      displays on the right-hand side of the parts palette.

   3. Place the crosshairs below the second static text part and click mouse
      button 1.

      The list box part is placed beneath the second static text part.

 Placing the push buttons in the window

 The To-Do List application needs two push buttons, one for adding items to the
 list and one for removing items from the list. Follow these steps to place two
 push button parts in the To-Do List application window:

   1. Select , the Buttons category, from the row of icons on the left-hand
      side of the parts palette.

   2. Select , the IPushButton* icon, from the row of icons on the right-hand
      side of the parts palette.

   3. Place the crosshairs below the lower-left corner of the list box and
      click mouse button 1.

      The first push button part is placed in the window.

   4. Select the IPushButton* icon again.

   5. Place the crosshairs to the right of the first push button and click
      mouse button 1.

      The second push button is placed in the window.

   6. Change the text of the first push button to Add. Use the same method you
      used to change the text in the title bar.

   7. Change the text of the second push button to Remove.


ΓòÉΓòÉΓòÉ 1.4. Size and align the parts ΓòÉΓòÉΓòÉ

Now that you have placed all of the parts you need in the application window,
it is time to resize and align them. When you have finished, your application
window should look like the following figure:

Matching the width of the list box to the width of the entry field

Follow these steps to match the width of the list box to the width of the entry
field:

   1. Move the mouse pointer over the list box.

   2. Press and hold mouse button 1.

      The selection handles appear at the four corners of the list box.

   3. While holding down mouse button 1, move the mouse pointer to the entry
      field.

      The selection handles on the list box become hollow and black selection
      handles appear on the four corners of the entry field. This means that
      both parts are selected, but the entry field is the anchor part.
      Therefore, any sizing actions performed using the tool bar cause the list
      box to match the size of its anchor part, the entry field.

   4. Select , the Match Width tool, from the row of icons on the tool bar,
      located beneath the menu bar.

      The width of the list box changes to match that of the entry field.

 Matching the width of the Add push button to that of the Remove push button

 Using the techniques you learned in the preceding steps, match the width of
 the Add push button to that of the Remove push button.

 Dragging and dropping parts in the application window

 Before you align the parts, you might want to drag and drop some of them to
 put them in closer proximity to each other. For example, you might want the
 static text parts to be closer to the parts that they label. Follow these
 steps to drag and drop the parts in the application window:

 Note:  The following instructions are written for dragging and dropping
        multiple parts simultaneously. If you just want to drag and drop one
        part at a time, you can skip the first step.

   1. Select all of the parts you want to drag using the technique you learned
      previously when matching the width of the list box to the width of the
      entry field.

   2. Move the mouse pointer over one of the parts that you selected to drag.

   3. Press and hold mouse button 2 and move the mouse cursor.

      Visual Builder displays an outline of the parts that you are dragging.

   4. Move the outline to the place where you want to drop the parts and
      release mouse button 2.

      The parts are moved to their new location.

 Resizing the application window

 At this point, the parts in the application window are closer to the left
 window border than to the right window border. Follow these steps to resize
 the application window:

   1. Select the application window by clicking mouse button 1 on the title
      bar.

   2. Move the mouse pointer over the selection handle on the lower-right
      corner of the application window.

   3. Press and hold mouse button 1.

   4. Resize the application window by dragging the mouse pointer towards the
      left until the right border of the application window is approximately
      the same distance from the entry field and list box as the left border
      is.

           To size the window in only one direction, either horizontally or
           vertically, hold down the Shift key while dragging the mouse
           pointer.

 Centering the entry field and list box within the application window

 The entry field and list box need to be centered within the application
 window. Follow these steps to center them:

   1. Select the entry field.

   2. Select , the Distribute Horizontally tool, from the row of icons on the
      tool bar.

      Visual Builder centers the entry field between the left and right borders
      of the application window.

   3. Select the list box and then the entry field, making the entry field the
      anchor part. Use the multiple part selection technique you learned
      previously.

   4. Select , the Align Center tool, from the row of icons on the tool bar.

      The list box is centered beneath the entry field.

 Aligning the static text, entry field, and list box parts so their left edges
 are even

 The static parts need to be aligned evenly with the left edges of the entry
 field and list box. Follow these steps to align them:

   1. Select the first static text part and then select the entry field, making
      the entry field the anchor part. Use the multiple part selection
      technique you learned previously.

   2. Select , the Align Left tool, from the row of icons on the tool bar.

      The first static text part is aligned even with the left edge of the
      entry field.

   3. Repeat steps 1 and 2 for the second static text part and the list box.

      The second static text part is aligned even with the left edge of the
      list box.

 Aligning the top edges of the push buttons

 The push buttons need to be aligned so that their top edges are even. Follow
 these steps to align them:

   1. Select the Add push button and then select the Remove push button. Use
      the multiple part selection technique you learned previously.

   2. Select , the Align Top tool.

      Visual Builder aligns the Add push button even with the top of the Remove
      push button.

 Spacing the push buttons evenly across the application window

 The push buttons need to be evenly spaced across the width of the application
 window. Follow these steps to space them:

   1. Select both push buttons. You can make either push button the anchor
      part. Use the multiple part selection technique you learned previously.

   2. Select , the Distribute Horizontally tool.

      Visual Builder spaces both push buttons evenly across the application
      window.

 Centering the push buttons between the bottom edge of the list box and the
 bottom border of the application window

 The push buttons need to be centered between the bottom edge of the list box
 and the bottom border of the application window. Follow these steps to center
 them:

   1. Select both push buttons. You can make either push button the anchor
      part. Use the multiple part selection technique you learned previously.

   2. Move the mouse pointer over either push button.

   3. Press and hold mouse button 2, and position the push buttons midway
      between the bottom edge of the list box and the bottom window border.

   4. When the push buttons are in place, release mouse button 2.

 Your application should now look like the one shown in the following figure:


ΓòÉΓòÉΓòÉ 1.4.1. Connect the parts ΓòÉΓòÉΓòÉ

Now it is time for you to connect the parts so that your application can add
items to and remove items from the to-do list. You need to connect the push
buttons to the list box and entry field. The following steps show you how to do
this.

           Before you start connecting parts, it is a good idea to make sure
           none of your parts is selected. Otherwise, the correct pop-up menus
           may not appear. To do this, hold down the Ctrl key, point to each
           item that is selected, and press mouse button 1. When the selection
           handles disappear, you know that the part is no longer selected.

 Connecting the Add push button to the list box

 The connection between the Add push button and the list box provides the
 information your application needs to add items to the list box.

   1. With the mouse pointer over the Add push button, click mouse button 2.

      A pop-up menu is displayed.

   2. Select Connect.

      A cascaded menu, called the connection menu, of the Add push button is
      displayed.

   3. Select the buttonClickEvent feature.

      Selecting the buttonClickEvent feature means that you want something to
      happen whenever a user clicks this push button. The mouse pointer changes
      to look like a spider, indicating that it is ready for you to select
      another feature.

   4. Move the mouse pointer to the list box and click mouse button 1.

      A pop-up menu is displayed showing the connection menu of the list box.

   5. Select the addAsLast action.

      Selecting the addAsLast action means that you want new items to be added
      to the end of the to-do list whenever a user clicks the Add push button.
      The connection is shown in the following figure:

      The line connecting the Add push button to the list box is dark green. It
      points from the push button to the list box, showing that the event that
      occurs when the push button is selected will cause the list box to
      perform an action.

      Notice that the connection line is dashed instead of solid. A dashed line
      means that the connection is incomplete. The connection is supposed to
      add something to the list box when the Add push button is clicked, but
      you have not yet supplied what needs to be added. The next step does
      that.

   6. Move the mouse pointer to the dashed connection line between the Add push
      button and the list box.

   7. To take a shortcut to display connection menus, hold down the Alt key and
      click mouse button 2.

      The pop-up menu for the connection is displayed.

   8. Select the text parameter.

      The text parameter is the reason the connection line is dashed. You need
      to give this parameter a value.

   9. Move the mouse pointer over the entry field, and click mouse button 1.

      Visual Builder displays the connection menu for the list box.

  10. Select the text attribute.

      Selecting the text attribute here means that you want to pass the text
      that a user enters in the entry field to the text parameter of the
      addAsLast action. This text string is added to the end of the to-do list
      whenever the addAsLast action is called, which occurs whenever the Add
      push button is clicked. The completed connection is shown in the
      following figure:

      The line connecting the entry field to the connection between the Add
      push button and the list box is violet. The solid arrow head points to
      the entry field, showing that the text attribute is the target of the
      connection.

      The hollow arrow head points to the connection line, indicating that the
      text parameter of the addAsLast action is the source of the connection.
      When the text parameter needs a value, which occurs when a user clicks on
      the Add push button, the connection invokes the get member function of
      the entry field's text attribute. The value of that attribute (the text
      in the entry field) is returned to the text parameter and the addAsLast
      action puts the text string in the list box.

      Notice that both of the connection lines are solid. This means that the
      connection between the Add push button and the list box now has the
      information it needs to perform its function, so the connection is
      complete.

 Connecting the Remove push button to the list box

 The connection between the Remove push button and the list box provides the
 information your application needs to remove items from the list box.

   1. With the mouse pointer over the Remove push button, hold down the Alt key
      and click mouse button 2.

      Visual Builder displays the connection menu for the Remove push button.

   2. Select the buttonClickEvent feature.

   3. Move the mouse pointer to the list box and click mouse button 1.

      Visual Builder displays the connection menu for the list box.

   4. Select the remove action.

      Selecting the remove action means that you want your application to
      remove the selected item in the to-do list whenever a user clicks the
      Remove push button. Once again, the connection is incomplete.

   5. Move the mouse pointer to the connection between the Remove push button
      and the list box.

   6. Hold down the Alt key and click mouse button 2.

      Visual Builder displays the connection menu for the connection.

   7. Select the index parameter.

      The index parameter is the reason the connection line is dashed. You need
      to give this parameter a value.

   8. Move the mouse pointer over the list box and click mouse button 1.

      Visual Builder displays the connection menu for the list box.

   9. Select the selection attribute.

      Selecting the selection attribute means that you want to pass the index
      of the selected item in the list box to the index parameter of the remove
      action. The remove action uses this index to determine which item to
      remove whenever the Remove push button is clicked.

      Making this connection completes your application. It should now look
      like the one shown in the following figure:

      Note:  In the preceding figure, we changed the shape of the connection
             between the Remove push button and the list box to make it easier
             for you to see. You can do this by selecting the connection and
             dragging the middle selection handle.

 Now that you have made all of the connections, the next step is to generate
 your C++ source code.


ΓòÉΓòÉΓòÉ 1.5. Generate the C++ code for my application ΓòÉΓòÉΓòÉ

The first thing you must do to get your application ready to build is to
generate the C++ code. This is a two-part process that consists of generating
the source code for your new visual part and then generating the source code
for your main procedure.

Generating the source code for your visual part

To generate the C++ source code for your visual part, select FileSave and
GeneratePart source.

           Another way to generate part code is to select , the Part Code
           Generation tool, on the tool bar. The results are the same.

 Visual Builder generates the following files in the working directory:

 todolist.cpp   The C++ code for your ToDoList part.
 todolist.hpp   The C++ header file for your ToDoList part.
 todolist.h     The resource header file for your todolist.cpp file.
 todolist.rc    The resource file for your todolist.cpp file.

 Generating the source code for your main() function

 To generate the source code for your main() procedure, select FileSave and
 Generatemain() for part. Visual Builder generates the following files in the
 working directory:

 todolist.app   The main function for your application.

                Note:  If you start Visual Builder from a WorkFrame project,
                       the name of this file is vbmain.cpp.
 todolist.mak   The make file that you specify when you build your application.

 You have now generated the C++ code for your application. The next step is to
 build the application.


ΓòÉΓòÉΓòÉ 1.6. Build the application ΓòÉΓòÉΓòÉ

Building your application consists of compiling and linking it. To build your
application, do the following:

   1. Open an OS/2 window.

   2. Change to your Visual Builder working directory.

   3. Enter the following command:

            nmake todolist.mak

      This command produces the following files:

      todolist.exe        The executable file for your application.
      todolist.map        The application configuration map.
      todolist.o          The object file for your application.

                          Note:  If you start Visual Builder from a WorkFrame
                                 project, the name of this file is vbmain.obj.
      todolist.obj        The object file for your part. Visual Builder
                          provides a separate object module for your part that
                          is used when compiling this part with other parts.
      todolist.res        The binary resource file that is bound to
                          todolist.exe.

 You have now built your application; the next step is to run your application.


ΓòÉΓòÉΓòÉ 1.7. Run the application ΓòÉΓòÉΓòÉ

To run your application from the same OS/2 command prompt from which you
entered the nmake command, enter the following:

todolist

Once your application is running, experiment with it to make sure it works as
you designed it. That is all there is to it!

You can add a finishing touch to your application by creating an OS/2 program
object. Create a program object from the OS/2 Templates folder, specifying the
name todolist.exe as the program name and the directory that contains
todolist.exe as the working directory. Once you have done this, you can run
your application by simply double-clicking on the program object you just
created.


ΓòÉΓòÉΓòÉ 1.8. Exit the Composition Editor and Visual Builder ΓòÉΓòÉΓòÉ

To exit either the Composition Editor or Visual Builder, do either of the
following.

Note:  When you exit Visual Builder, any changes you have made to the
       selections in the Options menu are saved. Therefore, if you want certain
       options to be selected or deselected the next time you start Visual
       Builder, be sure to select or deselect them before exiting Visual
       Builder.

     Select FileExit.
     Double-click on the system menu icon in the window.

 If you try to exit Visual Builder while one or more editor windows is open,
 Visual Builder displays a message asking if you want to close the editors and
 Visual Builder. You can select either of the following:

     The OK push button to exit the windows.
     The Cancel push button to cancel the exit request.

 If you select the OK push button with this message displayed or try to exit an
 editor and the open editor window contains unsaved changes, Visual Builder
 displays a message asking if you want to save the changes for each open editor
 before exiting. You can select either of the following:

     The Yes push button to save the changes and exit.
     The No push button to exit without saving the changes.
     The Cancel push button to cancel the exit request.


ΓòÉΓòÉΓòÉ 2. ...Set up and starting Visual Builder ΓòÉΓòÉΓòÉ

This chapter tells you how to do the following:

     Set up your WorkFrame project to use Visual Builder

     Start Visual Builder


ΓòÉΓòÉΓòÉ 2.1. Set up my WorkFrame project to use Visual Builder ΓòÉΓòÉΓòÉ

If you have created a WorkFrame project and will be running Visual Builder from
the project folder, you should set up the project as follows before starting
Visual Builder.

Note:  We recommend that you use a Project Smarts Visual Builder template in
       your WorkFrame project. Refer to the VisualAge C++ User's Guide for
       information on how to do this.

   1. Open the settings notebook for the project folder by doing the following:

        a. Click on the project folder with mouse button 2.

        b. Select OpenSettings.

           The settings notebook appears.

   2. Set the names of the executable file and the make file by doing the
      following:

        a. On the Target page, type the name that you want your executable file
           to have in the Name field.

        b. Type the name that you want your make file to have in the Makefile
           field.

   3. Set the directory in which your project files will be stored by doing the
      following:

        a. Select the tab for the Location OS/2 Files page.

        b. Type the full path for the directory in which you want to store your
           project files in the multiline edit field on this page. This is the
           directory in which Visual Builder puts the files for your
           application when you generate your source code.

   4. Inherit the settings of a C++ project by doing the following:

        a. Select the tab for the Inheritance page.

        b. Select the Add push button.

           A dialog is displayed in which you select the project whose settings
           you want to inherit.

        c. Double-click on the Desktop directory in the Directory list box.

        d. Double-click on the VisualAge C++ 3.0 directory, also in the
           Directory list box.

        e. Select the C Set ++ Project file in the File list box.

        f. Select the Inherit push button.

           This puts all of the WorkFrame tools, including Visual Builder, that
           you need for a C++ project in the project's pop-up menu, giving you
           easier access to them.

   5. Close the settings notebook.
 start Visual Builder.


ΓòÉΓòÉΓòÉ 2.2. Start Visual Builder ΓòÉΓòÉΓòÉ

You can start Visual Builder in the following ways:

     From the C/C++ window
     From the Tools folder icon
     From a WorkFrame Project folder

 Starting Visual Builder from the C/C++ window

 To start Visual Builder from the C/C++ window, do the following:

   1. Double-click on the icon for the VisualAge C++ folder.

      The folder opens.

   2. Double-click on the C/C++ Window icon.

      The C/C++ window opens.

   3. Type the following:

            icsvb

   4. Press the Enter key.

      Visual Builder displays the Visual Builder window, as shown in the
      following figure.

 Starting Visual Builder from the Tools folder

 To start Visual Builder from the Tools folder, do the following:

   1. Double-click on the icon for the VisualAge C++ folder.

      The folder opens.

   2. Double-click on the Tools folder icon.

      The folder opens.

   3. Double-click on the Visual Builder icon.

      Visual Builder displays the Visual Builder window, as shown in the
      preceding figure.

 Starting Visual Builder from a WorkFrame Project folder

 You can start Visual Builder from a WorkFrame Project folder in the following
 ways.

 Note:  The following steps assume that your project inherits the settings of a
        C Set ++ project or that it was created using a Project Smarts
        template.

     If the WorkFrame Project folder is closed, you can click on the folder
      with mouse button 2 and select Visual from the pop-up menu.

     If the WorkFrame Project folder is open, you can do any one of the
      following:

        -  Double-click on the name of the .vbb file

        -  Click on the name of the .vbb file with mouse button 2 and select
           Visual from the pop-up menu.

        -  Click on the white space in the project folder with mouse button 2
           and select Visual from the pop-up menu.

      Visual Builder displays the Visual Builder window, as shown in the
      preceding figure. If you double-clicked on a .vbb file to open Visual
      Builder, that file and all other .vbb files that you selected are
      preloaded.


ΓòÉΓòÉΓòÉ 3. ...Load part files ΓòÉΓòÉΓòÉ

To give Visual Builder access to parts, you must load the contents of the part
files that contain those parts by doing the following:

   1. Select FileLoad file in the Visual Builder window.

      Visual Builder displays the window shown below:

   2. Select the file or files that you want to load.

   3. Select the OK push button.

                     When you are just loading one file, it is quicker to
                     double-click on the file name instead of selecting the
                     file name and the OK push button.

      The file name or names are displayed in the Loaded Part Files list box in
      the Visual Builder window. The following figure shows the Visual Builder
      window with multiple .vbb files loaded.


ΓòÉΓòÉΓòÉ 4. ...Unload part files ΓòÉΓòÉΓòÉ

If a part file appears in the Loaded Part Files list box in the Visual Builder
window, Visual Builder has access to the parts that the part file contains. If
you do not want Visual Builder to have access to those parts, you can unload
the part file, with the exception of vbbase.vbb. To unload one or more part
files, do the following:

   1. Select one or more files in the Loaded Part Files list box.

      To select multiple files, hold down the Ctrl key while clicking on a file
      name with mouse button 1.

   2. Select FileUnload file.

      The following window is displayed showing the files you selected to
      unload:

      At this point, you can review the files that you selected and make any
      changes by deselecting any file or files that you want to remain loaded.

   3. Select the Unload push button.

      The window disappears and the file names are removed from the Loaded Part
      Files list box.


ΓòÉΓòÉΓòÉ 5. ...Select all part files ΓòÉΓòÉΓòÉ

To select all of the part files, select EditSelect all files. Visual Builder
highlights all of the part files listed in the Loaded Part Files list box.

At this point, you can review the list to see if you want to deselect any of
the files.


ΓòÉΓòÉΓòÉ 6. ...Deselect all part files ΓòÉΓòÉΓòÉ

To deselect all of the part files, select EditDeselect all files. Visual
Builder removes the highlighting from all of the selected part files listed in
the Loaded Part Files list box.

At this point, you can review the list to see if you want to select any of the
files.


ΓòÉΓòÉΓòÉ 7. ...Customize the information area ΓòÉΓòÉΓòÉ

The following options allow you to specify the kind of information that Visual
Builder displays in the information area for a selected part in the Visual
Builder window. To use these options, select OptionsInformation area and then
select one of the following options:

 Show base class
   Displays the C++ notation for a class and its base class. For example, if
   you select IVBContainerControl when this option is selected, Visual Builder
   displays the following in the information area to show that IControl is
   IVBContainerControl's base class:

      IVBContainerControl::IControl

 Show description
   Displays a brief description of the selected part. For example, if you
   select IVBContainerControl when this option is selected, Visual Builder
   displays the following description in the information area:

      IBM container control, any view

 Show full file names
   Displays the name of the part file in which the part is stored. For example,
   if you select IVBContainerControl when this option is selected, Visual
   Builder displays the following file name in the information area to show
   that VBBase.vbb contains the IVBContainerControl part.

      VBBase.vbb


ΓòÉΓòÉΓòÉ 8. ...See the base files ΓòÉΓòÉΓòÉ

Select OptionsShow base files to see the names of the parts in the .vbb files
that Visual Builder provides, as follows:

 VBBase.vbb
   Contains the base parts that Visual Builder provides.

 VBCC.vbb
   Contains sample parts based on the IBM Collection Class Library.

 VBMM.vbb
   Contains sample multimedia parts.


ΓòÉΓòÉΓòÉ 9. ...See where part files are located ΓòÉΓòÉΓòÉ

Select OptionsShow full file names to see the drive and directory where each
of your part files is stored.


ΓòÉΓòÉΓòÉ 10. ...See the type list ΓòÉΓòÉΓòÉ

To display a type list, do the following:

   1. Select the part file or files for which you want to see defined types.

   2. Select OptionsShow type list.

      A list box titled Loaded Type Information is displayed at the bottom of
      the Visual Builder window, as shown in the following figure.


ΓòÉΓòÉΓòÉ 11. ...Use File Allocation Table (FAT) file names ΓòÉΓòÉΓòÉ

Select Default to FAT file names if your system uses the File Allocation Table
(FAT) file system instead of the High Performance File System (HPFS). This
option is selected by default when you first install VisualAge C++. The FAT
file system limits file names to a maximum of eight characters and file name
extensions to a maximum of three characters.


ΓòÉΓòÉΓòÉ 12. ...Generate make files ΓòÉΓòÉΓòÉ

Select Generate make files if you want Visual Builder to generate a make file
for you when you generate the default source code for the main() function of
your application.


ΓòÉΓòÉΓòÉ 13. ...Set the working directory ΓòÉΓòÉΓòÉ

Select OptionsSet working directory if you want to store files created with
Visual Builder in a different working directory. The default working directory
is the directory in which you installed Visual Builder.

When you select this option, Visual Builder displays the following window:

To change the working directory, do the following:

   1. Type the complete path to the directory in which you want to store Visual
      Builder files that you create.

      The path consists of all directories that must be opened to get to the
      working directory.

   2. Select the OK push button.

 If the path you enter in the Working Directory window is invalid, Visual
 Builder displays an error message and resets the path to the last valid path
 that was entered.


ΓòÉΓòÉΓòÉ 14. ...Refresh the display ΓòÉΓòÉΓòÉ

You might want to ensure that the information displayed in the Visual Builder
window is current, for example, when you have loaded and unloaded several part
files or moved parts from one part file to another. If such a situation occurs,
you can cause the display to show the latest updates by selecting EditRefresh.


ΓòÉΓòÉΓòÉ 15. ...Work with the Class Editor ΓòÉΓòÉΓòÉ

     Entering a description of a part

     Moving a part to a different .vbb file

     Seeing the base class of a part

     Modifying a part's constructor

     Specifying your own constructor code

     Specifying your own destructor code

     Specifying a library file

     Specifying a starting resource ID

     Specifying a unique icon for your part

     Specifying the names of your code generation files

     Specifying files to include when you build your application


ΓòÉΓòÉΓòÉ 15.1. Enter a description of a part ΓòÉΓòÉΓòÉ

The Description field in the Class Editor is an entry field in which you can
enter a description of your part. This description is used in the following
places:

     If you add your part to the parts palette, the description appears in the
      information area at the bottom of the Composition Editor when you select
      the part.

     If you export your part information into a .vbe file, the description is
      included in the first line.

      In the following example, the text shown in quotation marks was taken
      from the Description field for the ToDoList part.

            //VBBeginPartInfo: ToDoList,"To-Do List sample application"


ΓòÉΓòÉΓòÉ 15.2. ...Move a part to a different .vbb file from the Class Editor ΓòÉΓòÉΓòÉ

The Part file specification field in the Class Editor shows the name of the
.vbb file that contains this part. If you want to move this part to another
.vbb file while using the Class Editor, do the following:

   1. Replace the name of the current .vbb file with the name of another .vbb
      file in which you want to store the part.

   2. Select FileSave to apply the change.

      Visual Builder moves the part from the former .vbb file to the one you
      just specified. If the .vbb file you specified does not exist, Visual
      Builder creates it for you.


ΓòÉΓòÉΓòÉ 15.3. ...See the base class of a part ΓòÉΓòÉΓòÉ

The Base class - access level field in the Class Editor shows the name of the
base class for your part. This is the class name that you specified as the base
class when you created the part.

This field also shows you the current access level to the base class:  public,
protected, or private.

You cannot modify the base class name or the access level.


ΓòÉΓòÉΓòÉ 15.4. ...Modify a part's constructor ΓòÉΓòÉΓòÉ

The Constructor field in the Class Editor initially contains a default
constructor that Visual Builder inserts for you. If the default constructor
does not do exactly what you want it to do, you can modify it by typing over
the text in this field.

If you want your class to have multiple constructors, we recommend putting them
in the .hpv and .cpv files that contain your default feature code and then
including them when you generate your code. Otherwise, if you modify your code
after generating it, your changes will be lost the next time you generate your
code.

For information about including files, see Specifying Files for Visual Builder
to Include When You Build Your Application.


ΓòÉΓòÉΓòÉ 15.5. ...Specify my own constructor code ΓòÉΓòÉΓòÉ

Use the User constructor code field in the Class Editor to enter your own
constructor code for the part that you are editing. If you enter code in this
field, it is added at the end of the default constructor that Visual Builder
provides for you. If you have more than one line of code, put your code into a
function and put the function name in this field. Put the code for this
function in the files that Visual Builder creates when you generate your
default feature code. These file names are specified in the User .hpv file and
User .cpv file fields.


ΓòÉΓòÉΓòÉ 15.6. ...Specify my own destructor code ΓòÉΓòÉΓòÉ

Use the User destructor code field in the Class Editor to enter your own
destructor code for the part that you are editing. If you enter code in this
field, it is added at the beginning of the default destructor that Visual
Builder provides for you. If you have more than one line of code, put your code
into a function and put the function name in this field. Put the code for this
function in the files that Visual Builder creates when you generate your
default feature code. These file names are specified in the User .hpv file and
User .cpv file fields.


ΓòÉΓòÉΓòÉ 15.7. ...Specify a library file ΓòÉΓòÉΓòÉ

Use the .LIB file name field in the Class Editor to specify the name of a
library file (partname.lib) that you want to to be included when you generate
the source code for your part. The library file points to a .dll file that
contains information about a subpart in your application that was compiled
separately. When you generate the source code for your part, Visual Builder
includes a #pragma statement to include the library file.

When Visual Builder generates make files for other parts that use this part,
the .lib file is specified in the make file as a dependency.


ΓòÉΓòÉΓòÉ 15.8. ...Specify a starting resource ID ΓòÉΓòÉΓòÉ

Use the Starting resource id field in the Class Editor to specify the number
that Visual Builder is to use as a starting point for generating resource IDs
for your part. The resource IDs that Visual Builder generates are written into
a file named partname.h, which Visual Builder creates when you generate code
for your part.

The check box next to the field enables the starting resource ID. The first
time you select this check box, Visual Builder inserts a default starting
resource ID. You can change this number.

If you deselect the check box, the field is disabled. The number in the field
is included in the partname.h file when you generate your code, but it is not
referenced.

Generating resource IDs is useful if the text in your application is being
translated into another language. See Enabling National Language Support for an
Application for more information about using starting resource IDs.


ΓòÉΓòÉΓòÉ 15.9. ...Specify a unique icon for my part ΓòÉΓòÉΓòÉ

Fill in the fields in the Icon group box in the Class Editor before you add
your part to the parts palette so that you can use an icon other than the
default icon provided by Visual Builder to represent your part. The default
icon is .

The Icon group box contains the following fields:

 DLL name An entry field in which you enter the name of the resource DLL that
   contains the icon you want to use. Enter just the file name, not the
   extension.

 Resource Id The resource ID number of the icon in the DLL whose name you
   entered in the DLL name field.

 When you enter both the DLL name and a valid resource ID number, Visual
 Builder displays the icon that matches the resource ID number in the area
 below the Resource Id field. This occurs when you click on another field. This
 allows you to verify that you entered the correct resource ID number.


ΓòÉΓòÉΓòÉ 15.10. ...Specify the names of my code generation files ΓòÉΓòÉΓòÉ

The Code generation files group box in the Class Editor contains the following
fields:

     A C++ header file (.hpp) field
     A C++ code file (.cpp) field

 The file names displayed in these fields are the files into which your C++
 header file code and source code are written. This occurs when you generate
 default code from the Visual Builder window or from any of the editors by
 selecting FileSave and GeneratePart source.

 For complete information about generating default source code, see Generating
 Source Code for Parts and Applications.

 The fields in the group box initially contain .hpp and .cpp file names that
 are based on the name of the part you are editing. To change the file names in
 these fields, select FileSave so that Visual Builder uses the new file names.

 Warning: If the files already exist, Visual Builder replaces their contents
 with the code currently being generated.

 Visual Builder writes both files to the current directory.


ΓòÉΓòÉΓòÉ 15.11. ...Specify files to include when I build my application ΓòÉΓòÉΓòÉ

The User files included in generation group box in the Class Editor allows you
to specify files that you want to be included when you build your application.
These fields are typically used to contain the names of the files that hold
user code that Visual Builder is to use when you generate default feature code
for your part's features.

The .hpv and .cpv file extensions are used because the WorkFrame Build tool
tries to compile every .cpp file that it finds into an object module (.obj
file). Since these files are not meant to be compiled by themselves, we
selected a different file extension for you to use to prevent this from
happening.


ΓòÉΓòÉΓòÉ 16. ...Add an attribute ΓòÉΓòÉΓòÉ

To add an attribute in the Part Interface Editor, do one of the following:

     If you want to add the attribute using the default attribute type, get
      member function, set member function, and event identification that
      Visual Builder provides, enter a name in the Attribute name field and
      select the Add with defaults push button.

      Visual Builder adds the attribute to the part interface.

     If you want to see the default attribute type, get member function, set
      member function, and event identification that Visual Builder provides
      before you add the attribute, select the Defaults push button.

     If you want to add the attribute after seeing or modifying its default
      information or after entering your own information, select the Add push
      button.

      Visual Builder adds the attribute to the part interface.


ΓòÉΓòÉΓòÉ 17. ...Change an attribute ΓòÉΓòÉΓòÉ

To change, or update, an attribute in the Part Interface Editor, do the
following.

Note:  You can change anything about an attribute except its name. To change an
       attribute's name, you must create a new attribute with the name you want
       to use.

   1. Select the attribute that you want to change or type its name in the
      Attribute name field.

   2. Make the changes that you want to make in the fields on the right side of
      the Attribute page.

   3. Select the Update push button.

      Visual Builder saves the changes you made.


ΓòÉΓòÉΓòÉ 18. ...Delete an attribute ΓòÉΓòÉΓòÉ

To delete an attribute in the Part Interface Editor, do the following:

   1. Select the attribute that you want to delete or type its name in the
      Attribute name field.

   2. Select the Delete push button.

      Visual Builder deletes the attribute.

      Note:  If you added the attribute that you just deleted to the preferred
             features list, you must go to the Preferred page and delete it
             there, too.


ΓòÉΓòÉΓòÉ 19. ...Set defaults for an attribute ΓòÉΓòÉΓòÉ

To set defaults for an attribute in the Part Interface Editor, do the
following:

   1. Select the attribute that you want to set defaults for or type its name
      in the Attribute name field.

   2. Change the attribute type in the Attribute type field.

   3. Select the Defaults push button.

      Visual Builder changes all occurrences of the former attribute type to
      the new attribute type in the fields on the right side of the Attribute
      page.


ΓòÉΓòÉΓòÉ 20. ...Clear the Attribute page fields ΓòÉΓòÉΓòÉ

To clear the fields on the Attribute page, select the Clear push button.

Visual Builder clears all of the fields on the Attribute page.


ΓòÉΓòÉΓòÉ 21. ...Add an event ΓòÉΓòÉΓòÉ

To add an event in the Part Interface Editor, do one of the following:

     If you want to add the event using the default event identification that
      Visual Builder provides, enter a name in the Event name field and select
      the Add with defaults push button.

      Visual Builder adds the event to the part interface.

     If you want to see the default event identification that Visual Builder
      provides before you add the event, select the Defaults push button.

 To add a parameter and its type to this table, do the following.

 Note:  You can add only one parameter and type for each event.

   1. Move the mouse pointer over the table and click mouse button 2.

      Visual Builder displays a pop-up menu.

   2. Select either Add before or Add after.

      Visual Builder adds a row to the table with a default parameter name and
      type.

   3. If you want to change the defaults, do the following:

        a. Click on the parameter name with mouse button 1.

        b. Type the parameter name you want to use.

        c. Click on the parameter type with mouse button 1.

        d. Type the parameter type you want to use.

        e. Select the Update push button.


ΓòÉΓòÉΓòÉ 22. ...Change an event ΓòÉΓòÉΓòÉ

To change, or update, an event, do the following.

Note:  You can change anything about an event except its name. To change an
       event's name, you must create a new event with the name you want to use.

   1. Select the event that you want to change or type its name in the Event
      name field.

   2. Make the changes that you want to make in the fields on the right side of
      the Event page.

   3. Select the Update push button.

      Visual Builder saves the changes you made.


ΓòÉΓòÉΓòÉ 23. ...Delete an event ΓòÉΓòÉΓòÉ

To delete an event, do the following:

   1. Select the event that you want to delete or type its name in the Event
      name field.

   2. Select the Delete push button.

      Visual Builder deletes the event.

      Note:  If you added the event that you just deleted to the preferred
             features list, you must go to the Preferred page and delete it
             there, too.


ΓòÉΓòÉΓòÉ 24. ...Set defaults for an event ΓòÉΓòÉΓòÉ

To set defaults for an event, do the following:

   1. Select the event that you want to set defaults for or type its name in
      the Event name field.

   2. Select the Defaults push button.

      Visual Builder changes the former event identification to the default
      event identification in the Event identification field.


ΓòÉΓòÉΓòÉ 25. ...Clear the Event page fields ΓòÉΓòÉΓòÉ

To clear the fields on the Event page, select the Clear push button.

Visual Builder clears all of the fields on the Event page.


ΓòÉΓòÉΓòÉ 26. ...Add an action ΓòÉΓòÉΓòÉ

To add an action in the Part Interface Editor, do one of the following:

     If you want to add the action using the part you are editing as the
      default return type, enter a name in the Action name field and select the
      Add with defaults push button.

      Visual Builder adds the action to the part interface.

     If you want to see the default return type before you add the action,
      select the Defaults push button.


ΓòÉΓòÉΓòÉ 27. ...Change an action ΓòÉΓòÉΓòÉ

To change, or update, an action in the Part Interface Editor, do the following.

Note:  You can change anything about an action except its name. To change an
       action's name, you must create a new action with the name you want to
       use.

   1. Select the action that you want to change or type its name in the Action
      name field.

   2. Make the changes that you want to make in the fields on the right side of
      the Action page.

   3. Select the Update push button.

      Visual Builder saves the changes you made.


ΓòÉΓòÉΓòÉ 28. ...Delete an action ΓòÉΓòÉΓòÉ

To delete an action in the Part Interface Editor, do the following:

   1. Select the action that you want to delete or type its name in the Action
      name field.

   2. Select the Delete push button.

      Visual Builder deletes the action.

      Note:  If you added the action that you just deleted to the preferred
             features list, you must go to the Preferred page and delete it
             there, too.


ΓòÉΓòÉΓòÉ 29. ...Set defaults for an action ΓòÉΓòÉΓòÉ

To set defaults for an action in the Part Interface Editor, do the following:

   1. Select the action that you want to set defaults for or type its name in
      the Action name field.

   2. Select the Defaults push button.

      Visual Builder changes the former return type to the default return type
      in both the Action member function and the Return type fields.


ΓòÉΓòÉΓòÉ 30. ...Clear the Action page fields ΓòÉΓòÉΓòÉ

To clear the fields on the Action page, select the Clear push button.

Visual Builder clears all of the fields on the Action page.


ΓòÉΓòÉΓòÉ 31. ...Promote a feature ΓòÉΓòÉΓòÉ

To promote a feature in the Part Interface Editor for a subpart, do the
following:

   1. Select a subpart name from the list box beneath the Subpart name field or
      type the name in the field.

      Visual Builder displays the name of the subpart that you select in the
      Subpart name field.

   2. Select a feature type from the list box beneath the Feature type field or
      type the name in the field.

      Visual Builder displays the type that you select (attribute, event, or
      action) in the the Feature type field.

   3. Select the feature that you want to promote from the list box beneath the
      Promotable feature field or type the name in the field.

      Visual Builder displays the feature that you select in the Promotable
      feature field.

   4. Do one of the following:

          If you want to promote the feature using the default name that
           Visual Builder provides, select the Add with defaults push button.

           Visual Builder promotes the feature and displays the feature name in
           both the Promote feature name field and in the list box below this
           field.

          If you want to see the default feature name that Visual Builder
           provides before you promote the feature, select the Defaults push
           button.

           Visual Builder displays the default name for the feature in the
           Promote feature name field.

          If you want to promote a feature after seeing its default name or
           typing another name that you prefer, select the Add push button.

           Visual Builder promotes the feature using the name in the Promote
           feature name field and displays the name in the list box below this
           field.


ΓòÉΓòÉΓòÉ 32. ...Change a promoted feature ΓòÉΓòÉΓòÉ

To update a feature that you have already promoted, do the following:

   1. Select the promoted feature that you want to update.

   2. Select those aspects of the promoted feature that you want to update in
      the fields on the right side of the Promote page. You can select any or
      all of the following:

          Subpart name
          Feature type
          Promotable feature

   3. Select the Update push button.

      Visual Builder updates those aspects of the feature that you selected.


ΓòÉΓòÉΓòÉ 33. ...Delete a promoted feature ΓòÉΓòÉΓòÉ

To delete a promoted feature, do the following:

   1. Select the promoted feature that you want to delete.

   2. Select the Delete push button.

      Visual Builder deletes the promoted feature from the list box beneath the
      Promote feature name field.

      Note:  If you added the promoted feature that you just deleted to the
             preferred features list, you must go to the Preferred page and
             delete it there, too.


ΓòÉΓòÉΓòÉ 34. ...Clearing the Promote Page Fields ΓòÉΓòÉΓòÉ

To clear the fields on the Promote page, select the Clear push button. Visual
Builder removes the information from all of the fields on the page.


ΓòÉΓòÉΓòÉ 35. ...Add a preferred feature ΓòÉΓòÉΓòÉ

To add a preferred feature to the connection menu for a part, do the following:

   1. Select a feature name from one of the list boxes on the left side of the
      page.

   2. Do either of the following:

          Select the Add push button at the bottom of the page.

          With the mouse pointer still over the list box in which you selected
           the feature name, do the following:

             a. Click mouse button 2.

                A pop-up menu with the Add choice appears.

             b. Select Add to add the feature.

      The feature name that you selected is inserted into the Preferred
      Features list box in alphabetical order.


ΓòÉΓòÉΓòÉ 36. ...Remove a preferred feature ΓòÉΓòÉΓòÉ

You can remove a preferred feature name from the connection menu for a part.
Doing this removes the feature from the menu only; it does not delete the
feature.

To remove a preferred feature from the connection menu for a part, do the
following:

   1. Select the name that you want to remove from the Preferred Features list
      box.

   2. Do either of the following:

          Select the Remove push button at the bottom of the page.

          With the mouse pointer still over the feature name in the Preferred
           Features list box, do the following:

             a. Click mouse button 2.

                A pop-up menu appears.

             b. Select Remove to remove the selected feature.

      A message box is displayed to make sure you want to remove the name of
      this preferred feature.

   3. Select Yes to remove the feature name from the list.

      The feature name that you selected is removed from the list.


ΓòÉΓòÉΓòÉ 37. ...Remove all preferred features ΓòÉΓòÉΓòÉ

You can remove all of the feature names from the connection menu for a part.
Doing this removes the features from the menu only; it does not delete the
features. Once you remove all preferred features from the connection menu, you
must select More to use the features in a connection.

To remove all of the preferred features from the connection menu for a part, do
either of the following:

     Select the Remove all push button at the bottom of the page.

     With the mouse pointer over the Preferred Features list box, do the
      following:

        1. Click mouse button 2.

           A pop-up menu appears.

        2. Select Remove all to remove all of the selected features.

 A message box is displayed to make sure you want to remove all of the
 preferred features.

 Select Yes to remove all of the feature names from the list. All of the
 feature names are removed from the list.


ΓòÉΓòÉΓòÉ 38. ...Show inherited preferred features only ΓòÉΓòÉΓòÉ

To show only the preferred features that your part inherits from other parts,
select the Default push button.

A message box is displayed. Select Yes to display only the inherited preferred
features.


ΓòÉΓòÉΓòÉ 39. ...Create nonvisual parts ΓòÉΓòÉΓòÉ

     Defining the part interface

     Adding code to your part


ΓòÉΓòÉΓòÉ 39.1. Steps for creating nonvisual parts ΓòÉΓòÉΓòÉ

You create a part by doing the following:

   1. Design the part.

   2. Define the part interface, either through the Part Interface Editor or by
      importing a part information file.

   3. Add code to your part. You can use C++ code written outside of Visual
      Builder, or you can generate default feature code in Visual Builder and
      modify it.


ΓòÉΓòÉΓòÉ 39.2. Define the part interface ΓòÉΓòÉΓòÉ

When you are satisfied with your part's design, you are ready to define the
part interface to Visual Builder.

   1. Define the attributes of your part.

      A part's attributes typically correlate to the class' data members and
      can additionally include derived attributes, or attributes that are
      determined based on the value of other attributes.

   2. Define the member functions that get or set the value of those
      attributes.

   3. Define any actions that you want the part to be able to do.

      A part's actions correlate to the class' public member functions.

   4. Specify the event notification identifier used to signal a change in the
      value of each attribute.

 You can define the part interface in either of the following ways:

     Use the Part Interface Editor. With this method, you create the part from
      the Visual Builder window and then enter each feature of the part
      interface individually using the pages of the Part Interface Editor.

     Use a part information file. With this method, you encode part
      information in a file and then create the part and its interface by
      importing the information into Visual Builder. This method might be more
      efficient if C++ code already exists for your part. See and refer to
      Building VisualAge C++ Parts for Fun and Profit for information about
      creating part information files.


ΓòÉΓòÉΓòÉ 39.2.1. Define the part interface using the Part Interface Editor ΓòÉΓòÉΓòÉ

Open a new nonvisual part called OAContractor. The Part Interface Editor
appears.

On the Attribute page, do the following:

   1. Type lastName in the Attribute name text-entry field and select the Add
      with defaults push button.

   2. Change any of the default values, if needed. For this example, change the
      default attribute type to IString. You can do this by typing the value
      directly into the entry field or by selecting the drop-down list box
      arrow to the right of the entry field and selecting IString from the
      list.

      Also, edit the Get member function and Set member function fields,
      changing IStandardNotifier to IString. This causes these member functions
      to accept IString as a parameter instead of IStandardNotifier.

   3. Select the Update push button to save the changes you just made.

   4. Select the Clear push button to clear the fields before adding the next
      attribute.

   5. Repeat the previous steps for the contractor's firstName, middleInitial,
      homeStreet, homeCity, homeState, homeZip, startDate, endDate,
      currentContract, and phoneNumber attributes. For these attributes,
      specify the IString attribute type before selecting the Add with defaults
      push button in the first step. This prevents you from having to change
      IStandardNotifier* to IString as you did previously.

   6. Define the contractorID attribute as IString, with the following get
      member function:

            OAContractor & getContractorID ();

      This attribute is derived from other attributes; we will add the code for
      this later. You do not want users to set this attribute directly, so do
      not include a setContractorID member function.

   7. Define the activeStatus attribute as Boolean. Note that the default get
      member function and set member function follow a different format than
      the ones for IString attributes.

   8. To define the actions for OAContractor, select the Action page.

   9. Type putContractor in the Action name field and the following into the
      Action member function field:

            OAContractor & putContractor();

  10. Select the Add push button; then select Clear.

  11. Repeat for the getContractor and parseName actions. At this point, the
      Action page appears as shown in the following figure:

  12. Select Save from the File pull-down menu to save your work.


ΓòÉΓòÉΓòÉ 39.3. Add code to my part ΓòÉΓòÉΓòÉ

Once you have specified the part interface for your part, you are ready to add
the code to make the part work. Adding code involves the following tasks:

   1. Generating default feature code. If you already have C++ code for your
      part and have imported the part information, this step is not necessary.
   2. Modifying the feature code.
   3. Adding code created outside Visual Builder if it already exists.


ΓòÉΓòÉΓòÉ 39.3.1. Generate default feature code ΓòÉΓòÉΓòÉ

To generate default feature code for the OAContractor part, follow these steps.

Note:  This example is a continuation of the example in the preceding section
       using the OAContractor part, which should be open in the Part Interface
       Editor.

   1. Switch to the Class Editor by selecting the icon in the lower-right
      corner of the window.

   2. Specify the .hpv and .cpv files for Visual Builder to use for the default
      feature code for the OAContractor part's attributes and actions by
      filling in the following fields:

      User .hpv file        contrctr.hpv

      User .cpv file        contrctr.cpv

   3. Select FileSave and GenerateFeature source.

   4. Generate the default feature code using one of the following methods:

          Select the Generate all push button to generate default feature code
           for member functions and data members.

          Select the appropriate member functions and data members from the
           Member functions, Attribute data members, or Event data members list
           boxes. Then, select the Generate selected push button.

      For this example, select the Generate all push button.

      The default feature code is stored in the files you specified in the
      Class Editor, contrctr.hpv and contrctr.cpv. If these files already
      exist, the code you just generated is appended to the ends of these
      files.

      For most parts, you must modify the default code to make your part fully
      functional.


ΓòÉΓòÉΓòÉ 39.4. Modify the generated feature code ΓòÉΓòÉΓòÉ

After you have Visual Builder generate the feature code, review it. Does it do
what you need it to do? If not, modify the code. The OAContractor part needs
the following changes:

     Modified code for the getContractor action
     Modified code for the putContractor action
     Modified code for the parseName action
     Added code to set the activeStatus attribute
     Added code to set the contractorID attribute


ΓòÉΓòÉΓòÉ 39.4.1. Modify code for the getContractor action ΓòÉΓòÉΓòÉ

This version of our contractor application uses an IProfile-based database to
store information about the contractors. For our OAContractor part to use this
database, we must complete the getContractor and putContractor actions and
modify the activeStatus attribute. The following example shows the default code
generated for the two actions:

OAContractor & OAContractor::getContractor()
{
  return *this;
}

OAContractor & OAContractor::putContractor()
{
  return *this;
}

To modify default feature code, edit the code files using the syntax text
editor provided by VisualAge C++ or your favorite editor. Code for our
getContractor action follows:

OAContractor & OAContractor::getContractor()
{
// Start data access code

  IProfile *p = new IProfile("contrctr.ini");

// Test for missing name information
// Necessary for proper derivation of the contractorID attribute

  if ((!iLastName) || (!iFirstName) || (!iMiddleInitial))
  {
  throw IException("The contractor's name is incomplete. Complete all name fields and try again.");
  return *this;
  }

// Refresh the value of contractor ID

   setContractorID();

// Check for this contractor ID in the profile collection

  if (!p->containsKeyName("contractorID", iContractorID))
  {
  throw IException("A record was not found for this contractor.");
  return *this;
  }

// If other data exists for this contractor,
// set the corresponding contractor attributes

  if (p->containsKeyName("lastName", iContractorID))
    setLastName(p->elementWithKey("lastName", iContractorID));
  if (p->containsKeyName("firstName", iContractorID))
    setFirstName(p->elementWithKey("firstName", iContractorID));
  if (p->containsKeyName("middleInitial", iContractorID))
    setMiddleInitial(p->elementWithKey("middleInitial", iContractorID));
  if (p->containsKeyName("homeStreet", iContractorID))
    setHomeStreet(p->elementWithKey("homeStreet", iContractorID));
  if (p->containsKeyName("homeCity", iContractorID))
    setHomeCity(p->elementWithKey("homeCity", iContractorID));
  if (p->containsKeyName("homeState", iContractorID))
    setHomeState(p->elementWithKey("homeState", iContractorID));
  if (p->containsKeyName("homeZip", iContractorID))
    setHomeZip(p->elementWithKey("homeZip", iContractorID));
  if (p->containsKeyName("phoneNumber", iContractorID))
    setPhoneNumber(p->elementWithKey("phoneNumber", iContractorID));
  if (p->containsKeyName("startDate", iContractorID))
    setStartDate(p->elementWithKey("startDate", iContractorID));
  if (p->containsKeyName("endDate", iContractorID))
    setEndDate(p->elementWithKey("endDate", iContractorID));
  if (p->containsKeyName("currentContract", iContractorID))
    setCurrentContract(p->elementWithKey("currentContract", iContractorID));

// Call overloaded set member function using string parameter

  if (p->containsKeyName("activeStatus", iContractorID))
    enableActiveStatus(p->elementWithKey("activeStatus", iContractorID));

  delete p;

// End data access code

  return *this;
}

The getContractor action checks for one possible error condition. If it occurs,
the action throws an exception. Otherwise, the action retrieves data by
contractor identifier from the contrctr.ini file.

In response to these exceptions, the OAContractorView part shows a message box.
Constructing the User Interface. Passing Exceptions to Message Boxes.


ΓòÉΓòÉΓòÉ 39.4.2. Modify code for the putContractor action ΓòÉΓòÉΓòÉ

Code the putContractor action as follows:

OAContractor & OAContractor::putContractor()
{
// Start data entry code

  IProfile *p = new IProfile("contrctr.ini");

// Test for missing name information
// Necessary for proper derivation of the contractorID attribute

  if ((!iLastName) || (!iFirstName) || (!iMiddleInitial))
  {
  throw IException("The contractor's name is incomplete. Complete all name fields and try again.");
  return *this;
  }

// Refresh the value of contractor ID

  setContractorID();
  p->addOrReplaceElementWithKey("contractorID", contractorID(), iContractorID));

// If other data about this contractor exists, update it in the database

  if (lastName)
    p->addOrReplaceElementWithKey("lastName", lastName(), iContractorID));
  if (firstName)
    p->addOrReplaceElementWithKey("firstName", firstName(), iContractorID));
  if (middleInitial)
    p->addOrReplaceElementWithKey("middleInitial", middleInitial(), iContractorID));
  if (homeStreet)
    p->addOrReplaceElementWithKey("homeStreet", homeStreet(), iContractorID));
  if (homeCity)
    p->addOrReplaceElementWithKey("homeCity", homeCity(), iContractorID));
  if (homeState)
    p->addOrReplaceElementWithKey("homeState", homeState(), iContractorID));
  if (homeZip)
    p->addOrReplaceElementWithKey("homeZip", homeZip(), iContractorID));
  if (telephoneNumber)
    p->addOrReplaceElementWithKey("telephoneNumber", telephoneNumber(), iContractorID));
  if (startDate)
    p->addOrReplaceElementWithKey("startDate", startDate(), iContractorID));
  if (endDate)
    p->addOrReplaceElementWithKey("endDate", endDate(), iContractorID));
  if (currentContract)
    p->addOrReplaceElementWithKey("currentContract", currentContract(), iContractorID));
  if (iActiveStatus)
  {
    p->addOrReplaceElementWithKey("activeStatus", "yes", iContractorID));
  }
  else
  {
    p->addOrReplaceElementWithKey("activeStatus", "no", iContractorID));
  }

  delete p;

// End data entry code

  return *this;
}

The putContractor action checks for one possible error condition. If it occurs,
the action throws an exception. Otherwise, the action stores data by contractor
identifier in the contrctr.ini file.

In response to these exceptions, the OAContractorView part shows a message box.
Constructing Containers and Notebooks. Passing Exceptions to Message Boxes.


ΓòÉΓòÉΓòÉ 39.4.3. Modify code for the parseName action ΓòÉΓòÉΓòÉ

The parseName action parses input text from the Request for Contractor
Information window and sets the contractor's firstName, middleInitial, and
lastName attributes. Add code as follows:

OAContractor & OAContractor::parseName(const IString & aName)
{

// aName is supplied by user in OAQueryContractor
// Test for missing information in newly entered name

  if (aName.numWords()!= 3)
  {
  throw IException("The name you entered is incomplete.
                    Enter first name, middle initial, and last name.");
  return *this;
  }

// Set name attributes and derive contractorID attribute

  setFirstName(aName.word(1));
  setMiddleInitial(aName.word(2));
  setLastName(aName.word(3));
  setContractorID;

// End added code

  return *this;
}


ΓòÉΓòÉΓòÉ 39.4.4. Add code to set the activeStatus attribute ΓòÉΓòÉΓòÉ

You must add a member function to pass string data to the one Boolean
attribute, activeStatus. All data in our simple database is stored as strings,
but the set member function for the activeStatus attribute takes a Boolean as a
parameter. Because only OAContractor's two actions use this member function, it
is not necessary to add this to the part interface for OAContractor. However,
you must add the member function prototype to the contrctr.hpv file.

The following example shows both the default feature code and the added code in
contrctr.cpv:

Boolean OAContractor::isActiveStatus() const
{
  return iActiveStatus;
}

OAContractor & OAContractor::enableActiveStatus(const Boolean enable)
{
  if (iActiveStatus != enable)
  {
    iActiveStatus = enable;
    notifyObservers(INotificationEvent(OAContractor::activeStatusId, *this));
  } // endif
  return *this;
}

// Start Boolean string enabler

OAContractor & OAContractor::enableActiveStatus(const IString & status)
{
  Boolean tempBoolean = iActiveStatus;
  if (status = "yes") iActiveStatus = true;
  if (status = "no") iActiveStatus = false;
  if (tempBoolean != iActiveStatus)
  {
    notifyObservers(INotificationEvent(OAContractor::activeStatusId, *this));
  }
  return *this;
}

// End Boolean string enabler

iActiveStatus is the private data member that corresponds to the activeStatus
attribute.

The notifyObservers function signals that the value of the activeStatus
attribute has changed. For more information about notification, see Building
VisualAge C++ Parts for Fun and Profit.


ΓòÉΓòÉΓòÉ 39.4.5. Add code to set the contractorID attribute ΓòÉΓòÉΓòÉ

Now, add code to derive the value of the contractorID attribute. The following
example shows the code as modified in contrctr.cpv:

OAContractor & OAContractor::setContractorID()
{
  IString tempString = iFirstName+iMiddleInitial+iLastName;
  if (iContractorID != tempString)
  {
    iContractorID = tempString;
    notifyObservers(INotificationEvent(OAContractor::contractorIDId, *this));
  } // endif
  return *this;
}


ΓòÉΓòÉΓòÉ 39.5. Add code created outside Visual Builder ΓòÉΓòÉΓòÉ

To include previously existing member function code with generated class
declarations, do the following:

   1. Change the file extension of .cpp files to .cpv.
   2. Change the file extension of .hpp files to .hpv.
   3. Change the file extension of any .rc files to .rcv.
   4. Add these files to the Class Editor for the appropriate part.

 If you prefer not to use Visual Builder to develop the code for a nonvisual
 part but you want to be able to use it in the Composition Editor, you can do
 the following:

     Write the code.
     Compile it into a .lib file.
     Define the part interface using a part information file.
     Import the part information file.


ΓòÉΓòÉΓòÉ 40. ...Work with parts in the Visual Builder window ΓòÉΓòÉΓòÉ

     Displaying part names

     Selecting all parts

     Deselecting all parts

     Importing part information

     Exporting part information

     Creating a new part

     Opening parts

     Copying parts from one .vbb file to another

     Moving parts to a different .vbb file

     Deleting parts from a .vbb file

     Renaming parts in .vbb files


ΓòÉΓòÉΓòÉ 40.1. Display part names ΓòÉΓòÉΓòÉ

To display the names of the parts in a .vbb file, in the Loaded Files list box
in the Visual Builder window select the .vbb file whose parts you want to see.
The names of the parts contained in the .vbb file that you selected are
displayed in the Visual Builder window. Visual parts are displayed in the
Visual Parts list box; nonvisual parts and class interface parts are displayed
in the Nonvisual Parts list box.


ΓòÉΓòÉΓòÉ 40.2. Select all parts ΓòÉΓòÉΓòÉ

To select all of the parts in the selected .vbb files, select EditSelect all
parts.

At this point, you can review the list to see if you want to deselect any of
the parts. You can do so by pressing the Ctrl key and clicking on the part name
with mouse button 1.


ΓòÉΓòÉΓòÉ 40.3. Deselect all parts ΓòÉΓòÉΓòÉ

To deselect all of the parts in the selected .vbb files, select EditDeselect
all parts.


ΓòÉΓòÉΓòÉ 40.4. Import part information ΓòÉΓòÉΓòÉ

To import part information, do the following:

   1. Select FileImport part information.

   2. Select the part information file that you want to import.

   3. Select the OK push button.

      The part information in the part information file is imported. Any visual
      parts that the part information file contains are displayed in the Visual
      Parts list box, and any nonvisual parts and class interface parts it
      contains are displayed in the Nonvisual Parts list box. In addition, one
      or more .vbb files may be created.


ΓòÉΓòÉΓòÉ 40.5. Export part information ΓòÉΓòÉΓòÉ

To export part information, do the following:

   1. Select the part or parts whose information you want to export in either
      the Visual Parts list box, the Nonvisual Parts list box, or both.

   2. Select PartExport interface.

   3. Type the name of the .vbe file in which you want the part information to
      be stored in the Open filename field.

      If you do not enter a file name, Visual Builder uses exported.vbe as the
      default file name.

   4. Select the OK push button.

      The part information maintained by Visual Builder is exported to the file
      name you specified in the Open filename field.


ΓòÉΓòÉΓòÉ 40.6. Create a new part ΓòÉΓòÉΓòÉ

To create a new part, do the following:

   1. Select PartNew.

   2. Enter the name that you want to give to your part in the Class name
      field.

   3. Enter a description of your part in the Description field.

   4. Enter the name of the .vbb file in which you want Visual Builder to store
      the part in the File name field.

   5. Select the type of part that you want to create in the Part type field.
      You can select one of the following:

          Visual part
          Nonvisual part
          Class interface

   6. Either keep the default class name provided by Visual Builder in the Base
      class field, change it, or delete it.

   7. Select Open.

      One of the following occurs:

          If you are creating a visual part, the Composition Editor is
           displayed.

          If you are creating a nonvisual part or a class interface part, the
           Part Interface Editor is displayed.

   8. Use the displayed editor to create your part.


ΓòÉΓòÉΓòÉ 40.7. Open parts ΓòÉΓòÉΓòÉ

The following instructions tell you how to open one part at a time or multiple
parts simultaneously.

Opening one part

To open one part, do the following:

   1. Find the name of the part that you want to open by scrolling through the
      appropriate list box in the Visual Builder window.

      Note:  If the list boxes in the Visual Builder window are empty or if you
             cannot find the part, the .vbb file that contains the part you
             want to open is not selected or not loaded. See Loading .vbb Files
             if you need help loading .vbb files.

   2. Select the part you want to open.

   3. Select Part on the menu bar.

   4. Select Open in the pull-down menu.

      One of the following occurs:

          If you are opening a visual part, Visual Builder displays the
           Composition Editor.

          If you are opening a nonvisual part, Visual Builder displays the
           Part Interface Editor.

           A quicker way to open an existing part is to double-click on the
           part name within the Visual Parts or Nonvisual Parts list box.

 Opening multiple parts

 To open multiple parts, do the following:

   1. Find the name of the first part that you want to open by scrolling
      through the Nonvisual Parts and Visual Parts list boxes shown in the
      Visual Builder window.

      Note:  If the list boxes in the Visual Builder window are empty, see
             Loading .vbb Files if you need help loading .vbb files.

   2. Select the first part you want to open.

   3. Find the next part you want to open and press the Ctrl key while
      selecting that part.

   4. Continue finding and selecting parts in this manner, pressing the Ctrl
      key while selecting each part, until you have selected all the parts you
      want to open.

   5. Select Part on the menu bar.

   6. Select Open in the pull-down menu.

      Visual Builder displays a separate window for each part that you
      selected. The window displayed is the Composition Editor for visual parts
      or the Part Interface Editor for nonvisual parts.


ΓòÉΓòÉΓòÉ 40.8. Copy parts from one .vbb file to another ΓòÉΓòÉΓòÉ

To copy a part, do the following:

   1. Select the part that you want to copy in the Visual Parts or Nonvisual
      Parts list box.

      If you select more than one part or if you do not select a part, the Copy
      function is not available.

   2. Select PartCopy.

      The Source part name field shows the name of the part that you selected
      to copy.

   3. In the Target part name field, enter the name you want the part to have
      when you copy it.

   4. In the Target file name field, enter the name of the .vbb file to which
      you want to copy the part. If you leave this field blank, the part's
      current file name is used.

   5. Select the Copy push button.

      The part is copied under the new name and stored in the designated .vbb
      file.


ΓòÉΓòÉΓòÉ 40.9. Move parts to different .vbb files ΓòÉΓòÉΓòÉ

To move one or more parts from one .vbb file to another, do the following:

   1. Select the part or parts that you want to move.

      If you do not select at least one part, the Move function is not
      available.

   2. Select PartMove.

   3. Use the following instructions for moving one part or multiple parts:

      Moving one part

      If you selected one part, the following window is displayed:

      The Part name field of this window shows the name of the part that you
      selected to move. The File name field displays the complete path of the
      .vbb file that contains the part you want to move.

      Do the following:

        a. In the New file name field, enter the path and name of the .vbb file
           to which you want to move the part.

        b. Select the Move push button.

           The part is moved to the .vbb file specified in the New file name
           field.

      Moving multiple parts

      If you selected more than one part, the following window is displayed:

      The text in the window specifies the names of the parts you selected.

      Do the following:

        a. In the entry field, enter the name of the .vbb file to which you
           want to move the parts. If the .vbb file is not in your current
           directory, specify the complete path for the .vbb file.

        b. Select the OK push button.

           The parts are moved to the .vbb file specified in the entry field.


ΓòÉΓòÉΓòÉ 40.10. Delete parts from a .vbb file ΓòÉΓòÉΓòÉ

To delete a part, do the following:

   1. Select the part or parts that you want to delete in the Visual Parts list
      box, Nonvisual Parts list box, or both.

      If you do not select at least one part, the Delete function is not
      available.

   2. Select PartDelete.

      Deselect any parts that you do not want to delete. Once you delete a part
      from a .vbb file, you cannot recover it unless you have another copy
      stored in another .vbb file.

   3. Select the Delete push button.

      The selected parts are deleted.


ΓòÉΓòÉΓòÉ 40.11. Rename parts in .vbb files ΓòÉΓòÉΓòÉ

To rename a part in a .vbb file, do the following:

   1. Select the part that you want to rename in the Visual Parts or Nonvisual
      Parts list box.

      If you select more than one part or if you do not select a part, the
      Rename function is not available.

   2. Select PartRename.

      The Part name field shows the name of the part that you selected to
      rename.

   3. In the New part name field, enter the new name that you want to give the
      part.

   4. Select the Rename push button.

      The part is renamed under the new name.


ΓòÉΓòÉΓòÉ 41. ...Work with parts on the free-form surface ΓòÉΓòÉΓòÉ

     Placing parts on the free-form surface

     Selecting and deselecting parts

     Manipulating parts, which includes:

        -  Displaying pop-up menus
        -  Copying parts
        -  Deleting parts
        -  Editing text strings
        -  Renaming parts

     Arranging parts, which includes:

        -  Moving parts
        -  Positioning parts on the grid
        -  Sizing parts
        -  Matching part sizes
        -  Aligning parts
        -  Spacing parts within Composer parts
        -  Spacing parts within a bounding box

     Changing settings for a part

     Tearing off an attribute


ΓòÉΓòÉΓòÉ 41.1. Place parts on the free-form surface ΓòÉΓòÉΓòÉ

In the Composition Editor, you place visual, nonvisual, and class interface
parts on the free-form surface. This section explains how to place parts there
that appear on the parts palette, as well as parts that do not appear on the
parts palette.

Placing a part that appears on the parts palette

   1. From the left column of the parts palette, select the appropriate
      category. Then, from the right column, select the part you want to add.

      When the mouse pointer is moved over a place where the part can be
      placed, it changes to a crosshair, indicating that it is loaded with the
      part.

   2. Move the mouse pointer to where you want to add the part.

   3. Click mouse button 1.

      If you hold down mouse button 1 instead of clicking it, an outline of the
      part is displayed under the pointer to help you position the part. After
      the part is in position, release mouse button 1.

 To unload the mouse pointer at any time, do either of the following:

     Select , the Selection tool, on the tool bar.

     Select ToolsSelection Tool on the menu bar.

           To add several copies of the same part, select Sticky on the parts
           palette. When Sticky is selected, the mouse pointer remains loaded
           with the part you last selected. When Sticky is not selected, the
           mouse pointer becomes unloaded after you add a part.

 Placing a part that is not on the parts palette

 You can place on the free-form surface any part whose .vbb file is loaded by
 doing the following:

   1. Select Add part from the Options pull-down menu.

   2. Type the part's class name in the Part class field.

   3. Type a name for the part in the Name field.

   4. Select the Add push button to add the part.

   5. Move the crosshairs to the place where you want to add the part and click
      mouse button 1.


ΓòÉΓòÉΓòÉ 41.2. Select and deselect parts ΓòÉΓòÉΓòÉ

The following sections describe how to select and deselect a single part and
multiple parts.

Selecting a single part

To select a part that you have placed on the free-form surface, click on the
part with mouse button 1. If other parts are already selected, they are
deselected automatically.

Selecting multiple parts

Selecting multiple parts enables you to perform the same operation on several
parts at once. To select multiple parts, do one of the following:

     Hold down the Ctrl key and click mouse button 1 on each additional part
      you want to select.

     Hold down mouse button 1 instead of clicking it; then move the mouse
      pointer over each additional part you want to select. After you select
      the parts, release mouse button 1.

 Note:  Depending on the operation you want to perform, remember to consider
        which part you want to be the anchor part because that is the part you
        want to select last. For example, if you select two parts because you
        want to match the width of one part to the width of the other, the part
        you select last is the anchor part, the part whose width is used for
        the operation.

 Deselecting parts

 To deselect a part after you have selected it, do the following:

   1. Hold down the Ctrl key.

   2. Click on the selected part with mouse button 1.

 To deselect multiple parts, do the following:

   1. Hold down the Ctrl key.

   2. Click on a selected part with mouse button 1.

   3. Without releasing either the Ctrl key or mouse button 1, move the mouse
      pointer to another selected part.

   4. Repeat the previous step until all parts that you want to deselect have
      been deselected.


ΓòÉΓòÉΓòÉ 41.3. Manipulate parts ΓòÉΓòÉΓòÉ

Once a part is added to the free-form surface, you can manipulate it in a
number of different ways. The following sections explain each of those ways.

     Displaying pop-up menus

     Copying parts

     Deleting parts

     Editing text strings

     Renaming parts on the free-form surface


ΓòÉΓòÉΓòÉ 41.3.1. Display pop-up menus ΓòÉΓòÉΓòÉ

To display the pop-up menu of a part, click on the part with mouse button 2.
The pop-up menu displays the operations you can perform on that part.

A part does not have to be selected for you to display its pop-up menu. The
pop-up menu that is displayed is for the part the mouse pointer is over when
mouse button 2 is clicked, even if another part is selected.


ΓòÉΓòÉΓòÉ 41.3.2. Copy parts ΓòÉΓòÉΓòÉ

To copy parts by dragging them, do the following:

   1. Select all the parts you want to copy.

      If you only want to copy one part, you do not have to select it.

   2. Move the mouse pointer over the part you want to copy or one of the
      selected parts.

   3. Hold down the Ctrl key and mouse button 2.

   4. Drag a copy of the part or parts by moving the mouse pointer to a new
      position.

      An outline of the part or parts is displayed to help you with
      positioning. When you are copying multiple parts, the outlines of each
      part move together as a group.

   5. Release the Ctrl key and mouse button 2 when the part or parts are where
      you want them to be.

      A copy of the part or parts appears where you positioned the outline or
      outlines.

 Copying parts using the clipboard

 To copy parts by using the clipboard, do the following:

   1. Select all the parts you want to copy.

   2. From the Edit pull-down menu, select Copy.

      A copy of each selected part is placed on the clipboard.

   3. Select Paste from the Edit pull-down menu when you are ready to use the
      parts.

      The mouse pointer turns to crosshairs to show that it is loaded with the
      copied parts.

   4. Position the mouse pointer where you want the parts to be copied.

   5. Click mouse button 1.

      Copies of the parts are pasted at the position of the mouse pointer.

           Parts that you copy remain on the clipboard until you copy something
           else. Therefore, you can continue to paste copies of those parts by
           selecting Paste, positioning the mouse pointer, and clicking mouse
           button 1.

           If you select Paste and then decide against pasting the parts, you
           can unload the mouse pointer by either selecting the Selection Tool
           on the tool bar or by selecting ToolsSelection Tool on the menu
           bar.


ΓòÉΓòÉΓòÉ 41.3.3. Delete parts ΓòÉΓòÉΓòÉ

To delete one or more parts, do the following:

   1. Select all of the parts you want to delete.

      If you are deleting just one part, you do not have to select it.

   2. Position the mouse pointer over the part you want to delete or one of the
      selected parts.

   3. Click mouse button 2.

   4. From the part pop-up menu, select Delete.

      The part or parts are deleted.

           Any connections between the part that you are deleting and other
           parts are also deleted. Visual Builder displays a message to alert
           you to this. However, the EditUndo function also restores any
           connections that were removed when you deleted the part.


ΓòÉΓòÉΓòÉ 41.3.4. Edit text strings ΓòÉΓòÉΓòÉ

Some visual parts, such as push buttons and menus, have text strings. To
directly edit a part's text string, do the following:

   1. Hold down the Alt key.

   2. Click mouse button 1 on the text string.

   3. Edit the text string.

   4. When you have finished, do either of the following:

          Click mouse button 1 anywhere outside of the text string.

          Press Shift+Enter.

           You can also use this direct editing technique to edit the names of
           nonvisual parts. The name of a nonvisual part is displayed directly
           below its icon.


ΓòÉΓòÉΓòÉ 41.3.5. Rename parts on the free-form surface ΓòÉΓòÉΓòÉ

If you want to give parts names that are more descriptive or meaningful to your
application, you can do so as follows:

   1. Move the mouse pointer over the part whose name you want to change.

   2. Click mouse button 2 to display the pop-up menu for the part.

   3. Select Change Name.

      A Name Change Request window is displayed.

   4. Type a new name in the entry field.

   5. Select OK.

      Visual Builder changes the name of the part to the name that you typed in
      the entry field.

 You can also change a part's name by opening the part's settings notebook and
 changing the name in the Subpart name field.


ΓòÉΓòÉΓòÉ 41.4. Arrange parts ΓòÉΓòÉΓòÉ

You can arrange parts on the free-form surface in a number of different ways.
The following sections explain each of those ways.

     Moving parts

     Positioning parts on the grid

     Specifying grid spacing

     Showing and hiding the grid

     Sizing parts

     Matching part sizes

     Aligning parts

     Spacing subparts within Composers parts


ΓòÉΓòÉΓòÉ 41.4.1. Move parts ΓòÉΓòÉΓòÉ

To move a part, move the mouse pointer over the part, hold down mouse button 2,
and move the mouse pointer to drag the part to the new position.

           You can move several parts at once by first selecting all the parts
           you want to move and then dragging one of the parts as described.
           All of the selected parts will move together, maintaining their
           position relative to each other.


ΓòÉΓòÉΓòÉ 41.4.2. Position parts on the grid ΓòÉΓòÉΓòÉ

To position the top-left corner of parts to the nearest grid coordinate, do the
following:

   1. Select all the parts you want to position to the grid.

      Note:  If the parts you select are subparts, they are positioned to the
             grid set up inside the Composers part, not the grid for the
             free-form surface.

   2. Select , the Snap To Grid tool.

           You can automatically position a part to the nearest grid coordinate
           when it is added to the free-form surface or a Composers part by
           selecting Snap On Drop from the Options pull-down menu.


ΓòÉΓòÉΓòÉ 41.4.3. Specify grid spacing ΓòÉΓòÉΓòÉ

To specify the grid spacing, do the following:

   1. From the pop-up menu of a Composers part or the free-form surface, select
      Set Grid Spacing.

   2. Specify the horizontal and vertical distance between the lines of the
      grid in pixels.


ΓòÉΓòÉΓòÉ 41.4.4. Show and hide the grid ΓòÉΓòÉΓòÉ

To toggle between showing and hiding the grid for the free-form surface, do one
of the following:

     If no parts are selected, you can select , the Toggle Grid tool to toggle
      the grid for the free-form surface.

     If a Composers part is selected, selecting the Toggle Grid tool toggles
      the grid for the Composers part instead of the free-form surface.

 Toggling between showing and hiding the grid for a Composers part

 To toggle between showing and hiding the grid for a Composers part, do one of
 the following:

     Select the Composers part and the select , the Toggle Grid tool.

     From the Composers part's pop-up menu, select Toggle Grid.


ΓòÉΓòÉΓòÉ 41.4.5. Size parts ΓòÉΓòÉΓòÉ

To change the size of a part, select it and use mouse button 1 to drag one of
the selection handles to the new position. An outline of the part is displayed
under the mouse pointer to show you the new size of the part.

           You can size several parts at once by first selecting all the parts
           you want to size.

           To size a part in only one direction, press and hold the Shift key
           while using mouse button 1 to size the part. Holding down the Shift
           key prevents one dimension of the part from changing while you
           resize the other dimension. For example, to change the width of a
           part but prevent its height from changing, hold down the Shift key
           while changing the width.

           You can also size a part to the grid coordinates by selecting Snap
           On Size from the Options pull-down menu.


ΓòÉΓòÉΓòÉ 41.4.6. Match part sizes ΓòÉΓòÉΓòÉ

To size parts to the same width or height of another part, do the following:

   1. Select all the parts you want to size, making sure the last part you
      select is the part whose size you want the others to match.

   2. Select one of the following sizing tools from the tool bar:

        Match Width                        Match Height

      The size of all the parts you selected, with the exception of the last
      part, changes to match the size of the last part selected.


ΓòÉΓòÉΓòÉ 41.4.7. Align parts ΓòÉΓòÉΓòÉ

To align parts to the same position as another part, do the following:

   1. Select all the parts you want to align, and then select the part you want
      the others to be aligned with.

   2. Select one of the following alignment tools from the tool bar:

        Align Left                         Align Top
        Align Center                       Align Middle
        Align Right                        Align Bottom


ΓòÉΓòÉΓòÉ 41.4.8. Space subparts within Composers parts ΓòÉΓòÉΓòÉ

To evenly space subparts within their Composers part, do the following:

   1. Select all the parts you want to evenly space.

   2. Select one the following spacing tools from the tool bar:

        Distribute Horizontally
        Distribute Vertically


ΓòÉΓòÉΓòÉ 41.4.9. Space parts within a bounding box ΓòÉΓòÉΓòÉ

To evenly space parts within the unseen bounding box that contains the selected
parts, do the following:

   1. Select all the parts you want to evenly space. You must select a minimum
      of three parts.

   2. From the pop-up menu of one of the selected parts, select
      LayoutDistribute, and then one of the following:

      Horizontally In Bounding Box Evenly distributes the selected parts within
             the region bounded by the leftmost edge and rightmost edge of the
             selected parts.

      Vertically In Bounding Box Evenly distributes the selected parts within
             the region bounded by the topmost edge and bottommost edge of the
             selected parts.


ΓòÉΓòÉΓòÉ 41.5. Change settings for a part ΓòÉΓòÉΓòÉ

The settings notebook of a part provides a way to display and set attributes
and options for the part.

Opening the settings notebook for one part

To open the settings notebook for a part, move the mouse pointer over the part
and do one of the following:

     Double-click mouse button 1.

     Click mouse button 2 and select Open settings from the part's pop-up
      menu.

 Opening settings notebooks for multiple parts

 You can open the settings notebooks for multiple parts by doing the following:

   1. Select the parts whose settings you want to change.
   2. Move the mouse pointer over one of the selected parts.
   3. Click mouse button 2.
   4. Select Open settings from the pop-up menu.

      Visual Builder opens a settings notebook for each of the selected parts.

 Navigating through a settings notebook

 You can navigate through the notebook pages in the following ways:

     To turn the pages of a notebook, use the small left- and right-arrow push
      buttons at the bottom right corner of each page.

     To move to a different settings category, select one of the tabs to the
      right of the pages.

      Note:  When a category has more than one page, the page number and total
             number of pages within the category are displayed at the bottom of
             the page.

     If all the category tabs cannot fit below the pages of the notebook,
      small double left- and right-arrow push buttons are displayed to the left
      and right of the category tabs. Use these buttons to move through the
      available category tabs.

 Adding a handler

 To add a handler, do the following:

   1. Enter the name of the handler class in the Handler Name field, along with
      the list of parameters that you want to send to the handler's
      constructor. If you use any part names as parameters, be sure to use the
      default name that Visual Builder has assigned unless you have changed the
      name. Also, put a lower case "i" before those parameters because Visual
      Builder prefixes the part name with an "i" when it generates the code
      files. For example, if you are using the first entry field that you
      placed in a frame window as a parameter and have not changed the default
      name that Visual Builder assigns, the parameter name would be
      iEntryField1.

   2. If the Handler List list box contains other handlers, select the handler
      that you want your new handler to either precede or follow.

   3. Select either the Add after or Add before push button.

      If you did not import the handler class from a .vbe file, Visual Builder
      displays a message saying that the name you entered is not a valid part
      and asks if you want to continue.

   4. Select the Yes push button.

      The message disappears and the handler is added either after or before
      the handler that is selected in the Handler List list box, depending on
      which push button you select.

   5. Select the OK push button to save the new handler in the handler list and
      close the settings notebook.

           We recommend that you put your handler class declaration and code in
           separate user .hpv and .cpv files rather than modifying the files
           that Visual Builder generates. This way, if you need to regenerate
           the files, you do not have to recreate your handler code.

           Be sure to include the names of the files that contain the handler
           code in the User .hpv file and User .cpv file fields in the Class
           Editor.

           For information about implementing handlers, refer to the IBM Open
           Class Library User's Guide and the IBM Open Class Library Reference.

 Moving a handler

 To move a handler to a different position in the list, do the following:

   1. Select the handler that you want to move.

   2. Select the Move push button.

   3. In the dialog that is displayed, select the handler that is to precede or
      follow the handler being moved.

   4. Select the Move after push button to move the handler after the selected
      handler, or select the Move before push button to move the handler before
      the selected handler.

      The dialog disappears and the handler is moved.

 Removing a handler

 To remove a handler from the list, do the following:

   1. Select the handler you want to remove from the list.

   2. Select the Remove push button.

      The selected handler is removed from the list.

 Changing the color

 To change the color, do the following:

   1. In the Color Area group box, select the area, such as foreground or
      background, whose color you want to change.

   2. Do one of the following:

          If you want to specify red-green-blue values, select the RGB check
           box and specify values in the fields in the RGB Values group box.

          If you want to select a color by its name, deselect the RGB check
           box and select a color from the Colors drop-down list box.

   3. Select either the Apply push button to see how this color looks for your
      part without saving the change or the OK push button to close the
      settings notebook and save the color change.

 Specifying the size and position of a part

 To specify the size and position of a part, do the following:

   1. In the x and y fields, specify the initial x/y coordinates for the part.
      These coordinates determine the position of the part's upper left corner.

   2. In the width and height fields, specify the number of pixels for the
      width and height of the part.

   3. Optionally, you can also specify the smallest size the part can have by
      using the Minimum Size group box to do either of the following:

          If you want the minimum size to be calculated for you, select the
           Calculate at execution time radio button.

          If you want to specify the minimum size for the part, select the Set
           value here radio button and then enter the width and height in
           pixels in the corresponding fields.

 Changing the font for a part

 To change the font for a part, do one of the following:

     If you know the name and size of the font you want to use, you can enter
      them in their respective fields.

     If you do not know the name and size of the font you want to use or if
      you want to change the style or emphasis, select the Edit push button.
      Visual Builder displays a standard font dialog on which you can select
      the name, size, style, and emphasis you want to use for the part's font.

 Using code strings to supply initial field values

 Many settings pages provide fields in which you can specify initial values for
 part settings. For example, the General page of the IEntryField* settings
 notebook contains a Text field and a Limit field. In the Text field, you can
 enter a text string that you want Visual Builder to initially display in the
 entry field. The Limit field contains a default value of 32, which represents
 the maximum number of characters a user can type in the entry field, and you
 can change this number.

 To facilitate National Language Support (NLS) translation and code changes in
 providing settings values, you can enter a code string to provide those
 values. You must precede the code string with a number sign (#). If the first
 character of your code string is a #, be sure to enter two #s-the first one to
 signify that a code string follows and the second one to begin your code
 string.

 For example, suppose you want the initial text in an entry field to be Enter a
 name here. Further, suppose that you want the limit for this entry field to be
 18 characters. In a user header file (.hpv or .h), you could insert the
 following #define statements:

  #define NAME_PROMPT  "Enter a name here"
  #define NAME_LENGTH 18

           Be sure to enter the name of the file that contains these #define
           statements in the Required include files field in the Class Editor.
           Otherwise, this file is not included when you generate the code for
           this part.

 Then, on the General page of the IEntryField* settings notebook you could
 enter the following in the Text and Limit fields, respectively:

  #NAME_PROMPT
  #NAME_LENGTH

 By doing this, the values that you defined for NAME_PROMPT and NAME_LENGTH are
 used when you generate the source code for the part being edited.

 For an example that uses a code string to specify an icon to represent items
 in a container, see the subsection titled "Specifying the container type and
 layout" in Adding Container Parts.

 Activating settings changes

 After you make changes to the settings, you can activate them in the following
 ways:

     Select the OK push button to immediately activate and save the settings
      changes you have made, and close the settings notebook.

     Select the Apply push button to apply the settings changes you have made
      and keep the settings notebook open.

      This allows you to see whether you need to modify any of the changes you
      have made. The changes remain applied until you change them again.

 Select the Cancel push button to remove the settings notebook. If you made
 changes and selected the Apply push button, the changes are saved.

 Select the Help push button for more help with using the settings notebook.

 For information about the settings of a particular part, refer to the settings
 section of the part in the Visual Builder Parts Reference.


ΓòÉΓòÉΓòÉ 41.6. Use the generic settings notebook ΓòÉΓòÉΓòÉ

To view the settings notebook for your part, do one of the following:

     To set values for an instance of your part that you are using in a
      composite part, do the following:

        1. Place the part in the Composition Editor.

        2. Move the mouse pointer over the part and click mouse button 2.

        3. Select Open settings from the pop-up menu.

           Visual Builder displays the settings notebook for the part.

     To set attribute values for your part that will be available each time
      your part is used, do the following:

        1. Open the part.

        2. If the part is a nonvisual or class interface part, switch to the
           Composition Editor. You will already be in the Composition Editor if
           your part is a visual part.

        3. Move the mouse pointer over the free-form surface and click mouse
           button 2.

        4. Select Open settings from the pop-up menu.

                          A quicker way to open the generic settings notebook
                          is to double-click on the part.

           Visual Builder displays the settings notebook for the part.


ΓòÉΓòÉΓòÉ 41.7. Set the tabbing order ΓòÉΓòÉΓòÉ

Displaying the tabbing order list

To display the tabbing order list, do the following:

   1. Move the mouse pointer to the Composers part whose tab order you want to
      change.

   2. Click mouse button 2.

      Visual Builder displays the pop-up menu for the Composers part.

   3. Select Tabbing And Depth Order.

      A list of the current tabbing order is displayed.

 When the tabbing order is displayed, you can do the following:

     Change the positions of parts in the tabbing order list.

     Set groups and tab stops.

     Perform operations on parts in the tabbing order list.


ΓòÉΓòÉΓòÉ 41.7.1. Change the positions of parts in the tabbing order ΓòÉΓòÉΓòÉ

To change the position of a part within the tabbing order list, do the
following:

   1. Move the mouse pointer to the part whose position you want to change.

   2. Press and hold mouse button 2.

   3. Drag the part to a new position in the list.

   4. Release mouse button 2.

           You can change the position of several parts within the tabbing
           order at the same time by first selecting all the parts you want to
           move. You select multiple parts by holding down the Ctrl key and
           clicking on the parts with mouse button 1.

           You cannot move a subpart to a new Composers part by changing the
           tabbing order. You must do this in the Composition Editor.


ΓòÉΓòÉΓòÉ 41.7.2. Set groups and tab stops ΓòÉΓòÉΓòÉ

If you want the user to be able to move the input focus to a part using the Tab
and Backtab keys, select the Tab stop check box to the left of the part in the
tabbing order list.

If you want the user to be able to move the input focus to a part with the
keyboard arrow keys, select the Group check box to the left of the first part
in the group. All other parts listed below the part that has Group selected are
included in the group.

To start another group, select the Group check box for the part that you want
to be the first part in that group. If a part has both Group and Tab stop
selected, a user can tab to the first part in the group and then use the arrow
keys to move to the other parts in the group.


ΓòÉΓòÉΓòÉ 41.7.3. Perform operations on parts in the tabbing order list ΓòÉΓòÉΓòÉ

To perform an operation on a part in the tabbing order list, do the following:

   1. Move the mouse pointer over the part.

   2. Click mouse button 2.

      Visual Builder displays the pop-up menu for the part.

   3. Select the operation you want to perform.


ΓòÉΓòÉΓòÉ 41.8. Edit parts placed on the free-form surface ΓòÉΓòÉΓòÉ

If you need to edit a part that was added to the part you are currently
editing, do the following:

   1. If you have not already done so, load the .vbb file that contains the
      part you want to edit.

   2. Move the mouse pointer over the part you want to edit.

   3. Click mouse button 2.

      The part's pop-up menu appears.

   4. Select Edit Part.

      Visual Builder displays the appropriate editor for the part, as follows:

          If you are editing a visual part, Visual Builder displays the
           Composition Editor

          If you are editing a nonvisual or class interface part, Visual
           Builder displays the Part Interface Editor.

   5. Edit the part.

                     If you want to promote any of the features of the parts
                     used to create the composite part you are editing, doing
                     so now keeps you from having to edit this part again
                     later. See Promoting a Part's Features if you need more
                     information about doing this.

   6. Select FileSave to save the part.

   7. Close the editor by doing one of the following:

          Double-click on the system menu icon.
          Select FileExit.

      The editor you are using disappears and you are returned to the
      Composition Editor you were using previously. However, Visual Builder has
      not applied the changes you made to the part you just edited, so those
      changes are not visible yet.

   8. Select FileSave to save the original part.

   9. Close the Composition Editor for the original part that you were editing,
      as described above.

  10. Reopen the original part you were editing by double-clicking on the
      part's name in the Visual Builder window.

      You should now be able to see the changes you made to the part that you
      edited.


ΓòÉΓòÉΓòÉ 41.9. Promote a part's features ΓòÉΓòÉΓòÉ

The following steps show you how to promote a part's features from the
Composition Editor.

           To promote features of several subparts, we recommend using Promote
           page of the Part Interface Editor.

   1. If you have not already done so, load the .vbb file that contains the
      composite part whose features you want to promote.

   2. If you have not already done so, open the composite part or edit the
      subpart, whichever is necessary.

      Visual Builder displays the Composition Editor with the part that you are
      opening or the subpart that you are editing on the free-form surface.

   3. Move the mouse pointer over a part whose features you want to promote.

   4. Click mouse button 2 to display the part's pop-up menu.

   5. Select Promote Part Feature.

   6. Select a feature.

      The name of the feature you selected is displayed in the Promote feature
      name entry field prefixed with the name of the part. This is how the
      feature name will appear in the connections menu unless you change it
      before performing the next step.

   7. Select the Promote push button.

      The feature name is added to the Previously promoted list box, as shown
      inthe following figure:

   8. Repeat the previous two steps until you have promoted all of the features
      you need to make the necessary connections.

   9. Close the window for promoting features.

  10. Select FileSave to save the features you just promoted.

  11. Close the Composition Editor.

      You can now use the feature or features that you promoted to make
      connections.


ΓòÉΓòÉΓòÉ 41.10. Tear off an attribute ΓòÉΓòÉΓòÉ

Select Tear-Off Attribute from a part's pop-up menu to work with an attribute
as if it were a standalone part. The torn-off attribute is not actually a
separate part but a variable that either represents the attribute itself or
points to it.

When you select Tear-Off Attribute, Visual Builder displays the list of
attributes for the part that you are tearing from. After you select an
attribute from the list, you can drop the torn-off attribute on the free-form
surface. Visual Builder creates an


ΓòÉΓòÉΓòÉ 41.11. Undo changes in the Composition Editor ΓòÉΓòÉΓòÉ

If you change something in the Composition Editor and then decide that you
should have left things as they were, select Undo from the Edit pull-down menu
to restore the part to its previous state. You can undo as many operations as
you want, all the way back to when you opened the Composition Editor.

If you undo an operation and then decide that you did the right thing in the
first place, select Redo from the Edit pull-down menu. Redo restores the part
to the state it was in before the last Undo, including any connections that
were deleted.

If you are not sure which operations you want to undo or redo, select Undo/Redo
list from the Edit pull-down menu to display two lists of operations, one for
undoing and one for redoing. From these lists, you can select an operation and
then select the Undo or Redo push button. The operation that you select and all
of the operations listed below it are undone or redone.

Note:  Undo, Redo, and Undo/Redo list only affect operations you perform on the
       free-form surface and parts palette in the Composition Editor. They have
       no affect on any of the functions in the File pull-down menu, such as
       Save, Save As, and Save and Generate, which you cannot undo.


ΓòÉΓòÉΓòÉ 42. ...Construct a GUI using the OASearch application ΓòÉΓòÉΓòÉ

     Adding basic visual parts

        -  Adding the parts

        -  Changing the settings

     Adding a variable to a composite part

        -  Changing the variable's type

        -  Adding the variable to the part interface


ΓòÉΓòÉΓòÉ 42.1. Add basic visual parts ΓòÉΓòÉΓòÉ

The purpose of this section is to guide you through constructing a version of
the Opportunities Abound Contract Information window for the OASearch sample
application. You construct this part (ContractView) in the Composition Editor
using the basic visual parts. When finished, the Opportunities Abound Contract
Information window looks like the following figure:

To see the finished part, open contract.vbb. Begin with adding the parts.


ΓòÉΓòÉΓòÉ 42.1.1. Add the parts ΓòÉΓòÉΓòÉ

Before starting this new visual part, make sure that oanonvis.vbb is loaded
into Visual Builder.

Adding the parts

   1. Because you are constructing a new user interface, begin by creating a
      visual part. Call it ContractView.

      When you create a visual part, the Composition Editor opens a part that
      inherits from IFrameWindow*. By default, the client area of the
      IFrameWindow* appears as a canvas.

   2. Change the title of the window.

   3. Add the following parts to the window part:

          Static text and entry field parts for Account Number, Company Name,
           Project Manager, and Department.

          A group-box part for the Position Details group. Resize the group
           box.

          Static-text and entry-field parts for the items inside the group
           box.

          Push-button parts.

      See the figure below to see how the window should look after the parts
      are added.

 Changing the Labels

 Directly edit the static text so that the text matches the previous figure.

 Arranging the Parts

 Arrange the parts on the frame window part so they are aligned and positioned
 as shown the previous figure.

 Now that all the parts have been added, continue on with changing the
 settings.


ΓòÉΓòÉΓòÉ 42.1.2. Change the settings ΓòÉΓòÉΓòÉ

Now that the parts have been added for the user interface, customize the parts
by modifying their settings.

Specifying a push button label with mnemonic

On the General settings page for the middle push button, type ~Save in the Text
field. Select the OK push button.

The middle push button of your window now reads Save, with a mnemonic of S.
This means the user can select the push button by pressing Alt+S.

Repeat this procedure for the push button to the right of the Save push button,
specifying Cl~ear as the push button label. This push button now reads Clear,
with a mnemonic of E.

For the rightmost push button, specify ~Cancel as the label. This push button
now reads Cancel, with a mnemonic of C.

Specifying the default push button

On the General settings page for the leftmost push button, type ~Refresh in the
Text field. Select the Apply push button. The leftmost push button of your
window now reads Refresh, with a mnemonic of R.

On the Styles settings page, select the On radio button for the defaultButton
style. Select the OK push button. The Refresh push button is now the default
button for the window. This means the user can select the push button by
pressing the Enter key.

For details on the settings of a particular part, refer to the Visual Builder
Parts Reference. For more information on how to perform these operations, see
Changing Settings.

Now that the settings have been specified, the next step is making connections
between the parts.


ΓòÉΓòÉΓòÉ 42.2. Add a variable to a composite part ΓòÉΓòÉΓòÉ

Begin by opening the ContractView part (found in contract.vbb) in the
Composition Editor. If you prefer to use the OAContractView part, you can find
this part in oawin.vbb. At this point, the ContractView part appears as shown
in the following figure:

We are using a variable instead of an OAContract* part because the contract
data varies with the information entered from the OAQueryContract* part.

To add a variable to the free-form surface, select , the Models category, from
the parts palette; then add , an IVBVariable* part, to the free-form surface.
Change its name to Contract. The ContractView with a variable added appears as
shown in the following figure:

           Notice the square bracket symbols around the variable part. You can
           always identify a variable by these symbols. Also note that tear-off
           attributes also have square brackets and are in fact variables with
           a special connection.

 The next step is changing the variable's type.


ΓòÉΓòÉΓòÉ 42.2.1. Change the variable's type ΓòÉΓòÉΓòÉ

   1. First, make sure the the .vbb file holding the OAContract part
      (oanonvis.vbb) is loaded into Visual Builder.

   2. Select Change Type on the variable's pop-up menu; then type OAContract*

 The next step is adding the variable to the part interface.


ΓòÉΓòÉΓòÉ 42.2.2. Add the variable to the Part Interface ΓòÉΓòÉΓòÉ

So far, the Contract variable is empty. To make the variable available for
passing values from the main view (or any part outside ContractView), we must
add the variable to the part interface of ContractView), Do this by selecting
Promote Part Feature from the variable's pop-up menu. See Promoting a Part's
Features if you need information about doing this.

The next step is connecting the variable.


ΓòÉΓòÉΓòÉ 43. ...Learn to use connections ΓòÉΓòÉΓòÉ

     Making the connections

     Connecting features to member functions

     Connecting exception events to actions and member functions

     Manipulating connections

     Rearranging connections

     Making connections for the OASearch application
 shows the results of connecting attributes that have different behavior types.
 See


ΓòÉΓòÉΓòÉ 43.1. Make the connections ΓòÉΓòÉΓòÉ

In this section, you learn how to make attribute-to-attribute,
event-to-attribute, event-to-action, and attribute-to-action connections. This
section provides the following information:

     Determining the source and target

     Browsing a part's features

     Connecting features to features

     Satisfying parameters for incomplete connections

 Member function connections are discussed in Connecting Features to Member
 Functions. Custom logic connections are discussed in Adding a Custom Logic
 Connection.


ΓòÉΓòÉΓòÉ 43.1.1. Determine the source and target ΓòÉΓòÉΓòÉ

Here are the source and target rules:

     With an attribute-to-action, event-to-action, or event-to-attribute
      connection, the event is always the source and the action or attribute is
      always the target. If you try to make an action-to-attribute,
      action-to-event, or attribute-to-event connection, Visual Builder
      automatically reverses it for you.

     For attribute-to-attribute connections, if only one of the attributes has
      a set member function Visual Builder makes that attribute the target.
      This is done so that the attribute that has the set member function can
      be initialized when the application starts.

     When you make attribute-to-attribute connections, the order in which you
      choose the source and target is important. The source and target
      attribute values are probably different when your view is first
      initialized. If they are, Visual Builder resolves the difference by
      changing the target end of the connection to match the source.
      Thereafter, if both attributes have set member functions, the connection
      updates either attribute if the other changes.

 Refer to the attributes, actions, and events sections of the particular part
 in the Visual Builder Parts Reference for information that is specific to a
 part's features.


ΓòÉΓòÉΓòÉ 43.1.2. Browse a part's features ΓòÉΓòÉΓòÉ

To browse the features of a part, do the following:

   1. Move the mouse pointer over the part and click mouse button 2.

      Visual Builder displays the part's pop-up menu.

   2. Select Browse Part Features.

      Visual Builder displays a browse window that contains three columns: one
      for actions, one for attributes, and one for events.

   3. Select the feature you want to browse.

      Visual Builder displays information about the feature that you select in
      the entry fields below the feature columns.

   4. If the information about a part's features should change, you can select
      the Refresh push button to see those changes reflected in the browse
      window.

   5. When you have finished browsing the features, select the Close push
      button to close the browse window.


ΓòÉΓòÉΓòÉ 43.1.3. Connect features to features ΓòÉΓòÉΓòÉ

When you connect features to features, you can use any of the following
source-target combinations:

ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
ΓöéIf source is a...  ΓöéThe target can be a...  Γöé
Γöépart               Γöépart or connection      Γöé
Γöéconnection         Γöépart                    Γöé
ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ

Follow these steps to connect features:

   1. Position the mouse pointer over the source, the part or connection that
      you want to connect from, click mouse button 2, and select Connect from
      its pop-up menu.

                     To display the connection pop-up menu more quickly, hold
                     down the Alt key while clicking mouse button 2.

      A menu appears showing the names of the most commonly used attributes,
      actions, and events, called the preferred features. If the source is a
      part, there is usually a More selection at the bottom of the list.

      If the More selection is not there, this means the list contains all of
      the available features, not just the preferred ones, and there are no
      more from which to select.

   2. Do one of the following:

          If the feature you want appears in the list, select it.

          If the feature you want does not appear in the list, but the More
           selection is available, select More and then select the feature you
           want from the complete list of features.

          If the feature you want does not appear in either the preferred list
           or the expanded list that is displayed when you select More, you can
           edit the part to add the feature you need. For more information
           about this, see Editing Parts Placed on the Free-form Surface.

                          If, at this point, you decide not to complete the
                          connection, do one of the following:
                            -  If a pop-up menu is displayed, move the mouse
                               pointer away from the connection menu and click
                               mouse button 1.

                            -  If a window showing all of the features is
                               displayed, select the Cancel push button at the
                               bottom of the window.

                          The menu or window disappears and the connection is
                          not completed.

   3. Position the mouse pointer over the part or connection that you want to
      connect to.

      While moving the mouse, notice that a dashed line trails from the mouse
      pointer to the source of the connection.

   4. Click mouse button 1 and a pop-up menu appears, again showing a list of
      features.

   5. Select a name from the pop-up menu or from the More list.

      The same instructions regarding the presence of More apply as described
      previously.


ΓòÉΓòÉΓòÉ 43.1.4. Satisfy parameters for incomplete connections ΓòÉΓòÉΓòÉ

Satisfying a parameter using a connection

To supply a parameter value, do the following:

   1. Start a new connection using the dashed connection line that requires the
      parameter as the source.

   2. For the target, select the attribute, action, member function, or custom
      logic that is to provide the value that the parameter needs.

           While making a connection, when the mouse pointer is directly over
           the connection line, you see a small box as a visual cue that the
           pointer is positioned correctly.

 Satisfying a parameter using a constant value

 When connections need parameters whose input values are constant, you provide
 these values by using the settings window of the incomplete connection, as
 follows:

   1. Select Open settings from the incomplete (dashed) connection's pop-up
      menu.

                     A quicker way to open the settings window is to
                     double-click on the connection line.

      The settings window of the incomplete connection is displayed.

   2. Select the Set parameters push button.

      The Constant Parameter Value Settings notebook is displayed showing the
      parameters for which you can set constant values.

   3. Enter the constant parameter values you want to use.

   4. Do one of the following:

          Select the OK push button to apply the values and save them.

          Select the Apply push button if you want to see what effect these
           values have before saving them.

          Select the Cancel push button to remove the notebook without saving
           any of the parameter values you entered.

      You can select Help for additional information about entering parameter
      values.

 Specifying defaults for parameters

 There are two places in Visual Builder in which you can specify defaults for
 the parameters of actions in the declaration of the action's member function:

     In the part's .vbe file
     On the Action page of the Part Interface Editor

 Either of these allows a default value to be passed in an event-to-action
 connection, thus avoiding the need to satisfy a parameter.

 For example, suppose you want to connect the buttonClickEvent feature of a
 Remove push button to a removeSelected action that you created for an
 IListBox* part. Normally, you would also need to connect the selection
 attribute of the subclassed IListBox* part to the index attribute of the
 connection between buttonClickEvent and removeSelected. This connection would
 be required to get the index of the selected item in the list box.

 However, in the .vbe file of the IListBox* part, you can specify the following
 default parameter value for the removeSelected action: //VBAction:
 removeSelected, "removeSelected",, //VB:       removeSelected(unsigned long
 index=selection())

 This means that if no attribute of the IListBox* part is connected to the
 index attribute, the selection member function (the get member function of the
 selection attribute) is called by default to provide the index of the selected
 item.

 You could do the same thing by creating a removeSelected action on the Action
 page of the Part Interface Editor for the IListBox* part. You would specify
 the default parameter in the declaration of the removeSelected member function
 in the Action member function field, as follows: virtual unsigned long
 removeSelected(unsigned long index=selection())

 Missing or invalid parameters

 When an action connection requires arguments, be sure that you make the
 correct number of parameter connections. Also be sure that you make the
 parameter connections before you generate the default code for your part. See
 Manipulating Connections to learn how to re-order connections.


ΓòÉΓòÉΓòÉ 43.2. Connect features to member function connections ΓòÉΓòÉΓòÉ

     Adding an event-to-member function connection

     Using Browser information


ΓòÉΓòÉΓòÉ 43.2.1. Add an event-to-member function connection ΓòÉΓòÉΓòÉ

The following figure shows the OAContractorView part used in the OASearch
sample application in this book. The steps for adding an event-to-member
function connection, which follow the figure, are based on this part. For
information about how to construct this part, see Adding Notebook Parts.

   1. With the mouse pointer over the Clear push button, hold down the Alt key
      and click mouse button 2.

      Visual Builder displays the connection menu for the Clear push button.

   2. From this menu, select the buttonClickEvent choice, an event.

   3. Move the mouse pointer to a point on the free-form surface outside the
      OAContractorView notebook part and click mouse button 1.

   4. Select More.

      Visual Builder displays a window that contains three list boxes.

      For this example, the For class field should contain OAContractorView,
      the part that you are editing.

      For this example, the Access field should contain public.

   5. Type the member function to which the buttonClickEvent feature is to be
      connected in the entry field below the Access field. Be sure to type the
      full declaration of the member function, including return type and
      parameters.

      For this example, enter the following member function to clear all of the
      fields in OAContractorView: void resetFields();

      You must also create an .hpv file that contains this member function
      declaration and a .cpv file that contains the code for this member
      function. The member function declaration that you enter in this field
      must be identical to the declaration that you put in the .hpv file. For
      information about .hpv and .cpv files, see Specifying Files for Visual
      Builder to Include When You Build Your Application

      In addition, before you generate the code for your part, you must switch
      to the Class Editor and enter the names of these files so that Visual
      Builder will include them in the code for your part. For more information
      about including these files, see Specifying Files for Visual Builder to
      Include When You Build Your Application.

   6. Select the OK push button.

      The connection window disappears and a light green connection arrow is
      drawn from the Clear push button toward the edge of the free-form
      surface. It looks like this:


ΓòÉΓòÉΓòÉ 43.2.2. Use Browser information ΓòÉΓòÉΓòÉ

The cascaded menu that Visual Builder displays when you select FileBrowser
contains the following selections:

 Quick browse
   Causes Visual Builder to retrieve a list of the classes that the part you
   are editing inherits from, as well as a list of the member functions that
   your part and the part it inherits from contains. If you select one of the
   classes in the list, Visual Builder retrieves a list of the member functions
   that the class contains.

   This function is available only if you start Visual Builder from a WorkFrame
   project. It gives you access to browser information before you compile your
   application.

 Open browser data
   Works the same as Quick browse except you must compile your application with
   the -Fb+ option before using this function. Also, you do not have to start
   Visual Builder from a WorkFrame project to use this function.

 Refresh browser data
   Refreshes the list of the classes that the part you are editing inherits
   from, as well as the list that is displayed in the member function list box
   for the current class. If you reparse a part or recompile your application,
   use this function afterwards to ensure the data in the list boxes is
   current.

 Close browser data
   Removes the list of the classes that the part you are editing inherits from,
   as well as the member functions those classes contain.


ΓòÉΓòÉΓòÉ 43.3. Add a custom logic connection ΓòÉΓòÉΓòÉ

The requirements for connecting an event or attribute to custom logic are a
visual part that has at least one event or attribute specified for it.
Following are the steps to follow for adding a custom logic connection. The
following figure shows the History page of the OAContractorView part used in
the OASearch sample application in this book. The example used in the following
steps is based on this part.

   1. Select the right arrow in the lower right corner of the notebook to
      display the History page.

   2. With the mouse pointer over the Clear push button, hold down the Alt key
      and click mouse button 2.

      Visual Builder displays the connection menu for the Clear push button.

   3. From this menu, select the buttonClickEvent choice, an event.

   4. Move the mouse pointer to a point on the free-form surface outside the
      OAContractorView part and click mouse button 1. Doing this indicates to
      Visual Builder that you want to connect the event to the OAContractorView
      part instead of one of its subparts.

      Visual Builder displays the connection menu with the preferred features
      that have been defined for the OAContractorView part.

   5. Select Custom logic.

      Visual Builder displays the following window:

   6. Enter the following in the Description field:

            Custom logic code to clear all entry fields

   7. The buttonClickEvent feature is the event you want to connect to your
      custom logic, so do not change the Event name field for this example.

   8. The default return type of void is the return type you want to use, so do
      not change the Return type field for this example.

   9. Select the Target push button.

      Visual Builder inserts target-> in the Custom logic field.

      In the generated code, the entry fields that we want to clear are created
      using the new operator. For the StartEF part, the resulting pointer is
      called iStartEF.

  10. Type the following to the right of target->:

            iStartEF->removeAll();

      This code calls the removeAll member function for the StartEF part, the
      entry field labeled OA Start Date.

  11. Press the Enter key to move the cursor to a new line.

  12. Select the Target push button again.

  13. Type the following to the right of target->:

            iEndEF->removeAll();

      This code calls the removeAll member function for the EndEF part, the
      entry field labeled OA End Date.

  14. Press the Enter key to move the cursor to a new line.

  15. Select the Target push button again.

  16. Type the following to the right of target->:

            iContractEF->removeAll();
      and put the following line beneath it:

            return;

      This code calls the removeAll member function for the ContractEF part,
      the entry field labeled Current Contract.

      The connection window should now look like the following figure:

  17. Select the Add push button.

      The connection window disappears and a blue connection arrow is drawn
      from the Clear push button toward the edge of the free-form surface. It
      should look like this:


ΓòÉΓòÉΓòÉ 43.4. Connect exception events to actions and member functions ΓòÉΓòÉΓòÉ

To connect an exception event, do the following:

   1. Use your favorite text editor to create an action or member function that
      throws an exception.

      The easiest way to do this is to include the following in your action or
      member function source code:

                  throw IException("Error message.");

      where the text of the error message that you want to display in the
      message box is the only parameter given for the IException constructor.

   2. Connect an event to the action or member function you just created.

   3. Drop an IMessageBox* part on the free-form surface.

      This message box is used to display the error message.

   4. Move the mouse pointer to the connection you just made.

   5. While holding down the Alt key, press mouse button 2.

   6. Select the exceptionOccurred event from the connection menu.

   7. Move the mouse pointer to the IMessageBox* part.

   8. Click mouse button 1.

   9. Select the show action from the connection menu.

      This connection causes the application to show a message box that
      contains the exception error message whenever the exception is thrown.

 For an example using the OAContractorView part from the OASearch application,
 see Passing Exceptions to Message Boxes.


ΓòÉΓòÉΓòÉ 43.5. Manipulate connections ΓòÉΓòÉΓòÉ

Once a connection is made, you can manipulate it by doing the following:

     Changing settings for a connection

     Reordering connections

     Deleting connections

     Showing and hiding connections


ΓòÉΓòÉΓòÉ 43.5.1. Change settings for a connection ΓòÉΓòÉΓòÉ

To open the settings window for a connection, move the mouse pointer over the
connection and do one of the following:

     Double-click mouse button 1.

     Click mouse button 2 and select Open settings from the connection's
      pop-up menu.


ΓòÉΓòÉΓòÉ 43.5.2. Reorder connections ΓòÉΓòÉΓòÉ

If you make several connections from the same part, they run in the order in
which you made the connections. To ensure the correct flow of control when you
generate the source code, you may need to reorder the connections. If so, do
the following:

   1. Select the source part.

   2. From the source part's pop-up menu, select Reorder Connections From.

      Visual Builder displays the Reorder Connections window showing a list of
      your connections.

   3. With the mouse pointer over the connection you want to reorder, press and
      hold mouse button 2.

   4. Drag the connection to the place in the list where you want the
      connection to occur.

   5. Release mouse button 2.

   6. Repeat these steps until the connections are listed in the order in which
      you want them to occur.

   7. Close the window.


ΓòÉΓòÉΓòÉ 43.5.3. Delete connections ΓòÉΓòÉΓòÉ

You can delete a connection in either of the following ways:

     From the connection's pop-up menu.

      Note:  You do not have to select a connection to delete it using this
             method.

      To delete a connection from its pop-up menu, do the following:

        1. Click on the connection with mouse button 2 to display its pop-up
           menu.

        2. Select Delete.

     From the connection's settings window

      To delete a connection from its settings window, do the following:

        1. Open the settings window for the connection by doing one of the
           following:

             -  Double-clicking on the connection

             -  Clicking on the connection with mouse button 2 to display its
                pop-up menu and selecting Open Settings

        2. Select the Delete push button.


ΓòÉΓòÉΓòÉ 43.5.4. Show and hide connections ΓòÉΓòÉΓòÉ

You can show and hide connections by using , the Hide Connections tool, and ,
the Show Connections tool on the Tool bar. These tools show or hide all
connections that have the selected part or parts as their source or target. If
no parts are selected, these tools show or hide all of the connections.

           If you hide connections, the Composition Editor free-form surface is
           drawn faster and is less cluttered, making it easier for you to
           work.

 If no parts are selected, these tools show and hide all of the connections in
 the view. If a part or parts are selected, these tools show and hide the
 connections between the selected part or parts.

 Another way to show and hide connections is to move the mouse pointer over a
 part, click mouse button 2, and select the Browse Connections choice from the
 part's pop-up menu, which displays a cascaded menu. The choices in the menu
 affect only connections going to and from the part the mouse pointer was over
 when you displayed the pop-up menu.


ΓòÉΓòÉΓòÉ 43.6. Rearrange connections ΓòÉΓòÉΓòÉ

You can rearrange a connection by doing the following:

     Selecting connections

     Deselecting connections

     Changing the source and target of connections


ΓòÉΓòÉΓòÉ 43.6.1. Select connections ΓòÉΓòÉΓòÉ

You select connections in the same way that you select parts. When you select a
connection, three boxes called selection handles appear on it to show that it
is selected: one at each end and one in the middle. You can use these boxes to
change either of the following:

     The end points of the connection, as described in Changing the Source and
      Target of Connections.

     The shape of the connection arrow by dragging the middle box to another
      location. This helps you distinguish among several connection lines that
      are close together.

 Selecting a single connection

   1. Move the mouse pointer over the connection you want to select.

   2. Click mouse button 1 to select the connection.

      The connection is selected.

 Selecting multiple connections

 If you want to select several connections, do one of the following:

     To select multiple connections using just the mouse, do the following:

        1. Move the mouse pointer over one of the connections you want to
           select.

        2. Hold down mouse button 1 instead of clicking it.

        3. Move the mouse pointer over each connection that you want to select.

           The selection boxes appear on each connection that the mouse pointer
           passes over to show they are selected.

        4. After the connections are selected, release mouse button 1.

     To select multiple connections using both the mouse and the keyboard, do
      the following:

        1. Hold down the Ctrl key.

        2. Move the mouse pointer over a connection.

        3. Click mouse button 1 while the mouse pointer is over the connection
           line.

        4. Without releasing the Ctrl key, repeat the preceding steps until all
           connections that you want to select are selected.


ΓòÉΓòÉΓòÉ 43.6.2. Deselect connections ΓòÉΓòÉΓòÉ

If you want to deselect a connection without selecting another part or
connection, do the following:

   1. Move the mouse pointer over the connection line.

   2. Hold down the Ctrl key.

   3. Click mouse button 1.


ΓòÉΓòÉΓòÉ 43.6.3. Change the source and target of connections ΓòÉΓòÉΓòÉ

Visual Builder gives you the ability to change what a connection is pointing to
(the target) or pointing from (the source). Of course, you could always just
delete the connection and create a new one. However, the following steps show
you a quicker way to do this.

To move either end of a connection, do the following:

   1. Select the connection.

   2. Move the mouse pointer over either selection handle that appears on the
      ends of the connection.

   3. Press and hold mouse button 2.

   4. Move the mouse pointer to the new part or connection.

   5. Release the mouse button.

 Depending on the connection type, you may get a pop-up menu asking you for new
 information for the connection.

 What you can change

 You can change the source and target of either end of any connection. However,
 depending on the feature that you connect to when you make the change, you
 might get a different type of connection than the one you started with.

 The following table gives you a closer look at the connection types and what
 you can change without changing the connection type:

  ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ
  ΓöéConnection type               ΓöéMove either end  ΓöéMove source end  ΓöéMove target end  Γöé
  Γöéattribute-to-attribute        Γöéx                Γöé                 Γöé                 Γöé
  Γöéattribute-to-member function  Γöé                 Γöéx                Γöé                 Γöé
  Γöéattribute-to-action           Γöéx                Γöé                 Γöé                 Γöé
  Γöéevent-to-action               Γöéx                Γöé                 Γöé                 Γöé
  Γöéevent-to-attribute            Γöéx                Γöé                 Γöé                 Γöé
  Γöéevent-to-member function      Γöé                 Γöéx                Γöé                 Γöé
  Γöécustom logic                  Γöéx                Γöé                 Γöé                 Γöé
  Γöéparameter connection          Γöéx                Γöé                 Γöé                 Γöé
  ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ


ΓòÉΓòÉΓòÉ 43.7. Make the connections for the OASearch application ΓòÉΓòÉΓòÉ

The following sections show you how to connect the parts that were used to
create a GUI for the OAContractView part in Constructing a GUI: the OASearch
Application

     Enabling push buttons when an entry field contains a value

     Enabling a window to be cleared of all entry values

     Connecting the variable part

     Passing exceptions to message boxes


ΓòÉΓòÉΓòÉ 43.7.1. Enable push buttons when an entry field contains a value ΓòÉΓòÉΓòÉ

This section shows you how to make the connections that enable the Refresh and
Save push buttons in the OAContractView window. When you have made these
connections, the window appears as shown in the following figure:

Follow these steps to enable the push buttons:

   1. From the Account Number pop-up menu, select Connect.

   2. Select text from the list.

   3. Click on the Refresh push button.

   4. Select enabled from the pop-up menu.

   5. Follow the same procedure to connect the text attribute of the Account
      Number text part to the enabled attribute of the Save push button part.


ΓòÉΓòÉΓòÉ 43.7.2. Enable a window to be cleared of all entry values ΓòÉΓòÉΓòÉ

You can enable the Clear push button to empty all entry fields of their
contents using more than one method.

For this example, assume that the member function has been written. Make the
connection as follows:

   1. From the Composition Editor, use Alt-mouse button 2 to select the
      buttonClickEvent of the Clear push button.

      The connection spider appears.

   2. Use Alt-mouse button 2 to select an empty section of the free-form
      surface.

   3. Select More from the pop-up menu.

   4. Enter the member function declaration in the entry field as shown in the
      following figure:

   5. Select the OK push button.

   6. Switch to the Class Editor.

      Include the files containing the member function code. For this example,
      the file names are oafwclr.cpv and oafwclr.hpv.

        a. In the User .hpv file field, type the name of the header file,
           oafwclr.hpv
        b. In the User .cpv file field, type the name of the code file,
           oafwclr.cpv

 For details on the attributes, actions, or events of a particular part, refer
 to the Visual Builder Parts Reference. For more information on how to perform
 these operations, see Making the Connections.


ΓòÉΓòÉΓòÉ 43.7.3. Connect the variable part ΓòÉΓòÉΓòÉ

Once you have added the variable to the free-form surface and set its name and
type, you need to connect it to the OAContractView composite part.

Making the attribute-to-attribute connections

So that recruiters can display and update contract information held by the
Contract variable, you must make attribute-to-attribute connections between the
composite visual part and the Contract variable as follows:

 From part, feature            To part, feature

 Contract,#accountNum          EntryField1,#text

 Contract,#companyName         EntryField2,#text

 Contract,#projectMgr          EntryField3,#text

 Contract,#deptName            EntryField4,#text

 Contract,#positionTitle       EntryField5,#text

 Contract,#startDate           EntryField6,#text

 Contract,#endDate             EntryField7,#text

 Contract,#currContractor      EntryField8,#text

 So far, the connections appear as shown in the following figure:

 Making the event-to-action connections

 To enable push buttons on the composite visual part, you must make
 event-to-action connections. This is a two-step process, because you specified
 an input parameter for each of the data access actions. First, connect each
 push button to the Contract variable. The connection line appears dashed,
 indicating an incomplete connection. Next, connect the attribute that
 represents the input parameter to the event-to-action connection itself.

 For this example, make the following connections:

 From part, feature                        To part, feature

 PushButton1,#buttonClickEvent             Contract,#getContract

 EntryField1,#text (Account Number text)   The anAccountNum parameter of the
                                           PushButton1,#buttonClickEvent-->
                                           Contract,#getContract connection.
                                           Visual Builder draws the parameter
                                           connection in the opposite
                                           direction.

 PushButton2,#buttonClickEvent             Contract,#putContract

 EntryField1,#text (Account Number text)   The anAccountNum parameter of the
                                           PushButton2,#buttonClickEvent-->
                                           Contract,#putContract connection.
                                           Visual Builder draws the parameter
                                           connection in the opposite
                                           direction.

 The connections now appear as shown in the following figure:

 The putContract and getContract actions throw exceptions when the account
 number is not found in the database.

 The next step is passing the exception to a message box.


ΓòÉΓòÉΓòÉ 43.7.4. Pass exceptions to message boxes ΓòÉΓòÉΓòÉ

You can trigger the display of a message box when an exception is thrown.
Although a message box is a user-interface element, Visual Builder treats
message boxes as nonvisual parts.

Adding the message box

To add a message box to the free-form surface, select , the Other category,
from the parts palette; then add , an IMessageBox* part, to the free-form
surface.

Making the connections

Now, connect the exceptionOccurred event of each event-to-action connection to
the showException action of the message box.

The connections appear as shown in the following figure. Save and close your
visual part.


ΓòÉΓòÉΓòÉ 44. ...Display objects in a list box ΓòÉΓòÉΓòÉ

The following steps show you how to modify the original To-Do List application
to use objects instead of text strings. If you have not already done so, please
complete the original application, shown in Creating a Simple Visual Builder
Application, before continuing with this example.

     Copying the ToDoList part

     Creating the ToDoItem nonvisual part

     Replacing and modifying the list box

     Placing and modifying an IVBFactory* part

     Placing and modifying an IVSequence* part

     Making the new connections

     Generating the source code for your visual part and main() procedure

     Building and running the modified application


ΓòÉΓòÉΓòÉ 44.1. Copy the ToDoList part ΓòÉΓòÉΓòÉ

First, you must copy the ToDoList part, as follows:

   1. Select todolist.vbb.

      Visual Builder displays the name of the ToDoList part in the Visual Parts
      list box.

   2. Select the ToDoList part.

   3. Select PartCopy.

      Visual Builder displays the Copy Part window.

   4. Enter ToDoLst2 in the Target part name field.

   5. Enter todolst2.vbb in the Target file name field.

   6. Select the Copy push button.

      Visual Builder creates a copy of the ToDoList part, gives it the name
      ToDoLst2, and stores it in the todolst2.vbb file.


ΓòÉΓòÉΓòÉ 44.2. Create the ToDoItem nonvisual part ΓòÉΓòÉΓòÉ

The next step is to create a nonvisual part called ToDoItem, as follows:

   1. Open a new nonvisual part by doing the following:

        a. In the Visual Builder window, select PartNew.

           Visual Builder displays the Part - New window.

        b. Fill in the fields in this window as follows.

           Class name         ToDoItem

           Description        Type of objects in To-Do List

           File name          ToDoLst2.vbb

           Part type          Nonvisual part

           Base class         IStandardNotifier

        c. Select the Open push button.

           Visual Builder displays the Part Interface Editor.

   2. Create a new attribute called toDoItemName by doing the following:

        a. On the Attribute page, fill in the following fields:

           Attribute name        toDoItemName

           Attribute type        IString

        b. Select the Add with defaults push button.

           Visual Builder adds the toDoItemName attribute to the ToDoItem part.

                     You can add the toDoItemName attribute to the preferred
                     features list so that it will be readily available for
                     making connections by doing the following:
                       a. Switch to the Part Interface Editor.

                       b. Select the Preferred page.

                       c. Scroll down the list of attributes until you find the
                          toDoItemName attribute and select it.

                       d. Select the Add>> push button.

                          Visual Builder adds the toDoItemName attribute to the
                          list of preferred features so that it will appear in
                          the pop-up connection menu.

   3. Specify the .hpv and .cpv files for Visual Builder to use for the default
      feature code for the toDoItemName attribute by doing the following:

        a. Switch to the Class Editor if you followed the steps in the
           preceding hint.

        b. Fill in the following fields:

           User .hpv file        ToDoItem.hpv

           User .cpv file        ToDoItem.cpv

   4. Generate the default source and feature code for the ToDoItem part by
      doing the following:

        a. Select FileSave and generatePart source.

           Visual Builder generates the code for the ToDoItem part and stores
           it in files named ToDoItem.hpp and ToDoItem.cpp. These files contain
           the appropriate include statements for the ToDoItem.hpv and
           ToDoItem.cpv files.

        b. Select FileSave and generateFeature source

           Visual Builder generates the default code for the toDoItemName
           attribute and stores it in the ToDoItem.hpv and ToDoItem.cpv files.

   5. Override the asString member function in the IVBase* part by doing the
      following:

        a. Using your favorite text editor, edit the ToDoItem.hpv file and
           insert the following at the bottom of the public section:

                        IString ToDoItem :: asString () const;

        b. Save the file.

        c. Edit the ToDoItem.cpv file and insert the following at the bottom of
           the file:

                      IString ToDoItem :: asString () const
                      {
                        return toDoItemName();
                      }

        d. Save the file and close the text editor.

   6. Close the Part Interface Editor.

 The ToDoItem part is now completed.


ΓòÉΓòÉΓòÉ 44.3. Replace and modify the list box ΓòÉΓòÉΓòÉ

You need a list box that can display objects instead of just text strings, so
next you must replace the IListBox* part with an ICollectionViewListBox* part,
and then modify the ICollectionViewListBox* part to specify the type of objects
it can display.

Replacing IListBox* with ICollectionViewListBox*

   1. Open the ToDoLst2 part.

   2. Delete the IListBox* part.

      The IListBox* part only accepts strings. You want a part that accepts
      objects.

      Visual Builder displays a message warning you that it will delete the
      connections as well as the list box if you continue. You want to delete
      the connections because you need different connections for this example.

   3. Select the OK push button.

      Visual Builder deletes the list box and the connections.

   4. Select , the Lists category, from the row of icons on the left-hand side
      of the parts palette.

   5. Select , the ICollectionViewListBox* icon, from the row of icons that
      Visual Builder displays on the right-hand side of the parts palette.

   6. Place the crosshairs below the bottom left corner of the second static
      text part and click mouse button 1.

      A list box part that displays the items in a collection is placed beneath
      the second static text part.

 Specifying the type of items the list box can contain

   1. Move the mouse pointer to the list box, click mouse button 2, and select
      Open Settings.

      Visual Builder displays the settings notebook for the list box.

   2. Enter ToDoItem* in the Class name of items field.

   3. Select the OK push button.

      The list box can now accept only ToDoItem* objects.


ΓòÉΓòÉΓòÉ 44.4. Place and modify an IVBFactory* part ΓòÉΓòÉΓòÉ

You need an IVBFactory* part to create the objects to be displayed in the list
box. In addition, you must specify the type of objects the IVBFactory* part can
create.

Placing an IVBFactory* part on the free-form surface

   1. Select , the Models category, from the row of icons on the left-hand side
      of the parts palette.

   2. Select , the IVBFactory* icon, from the row of icons that Visual Builder
      displays on the right-hand side of the parts palette.

   3. Place an object factory part on the free-form surface to the right of the
      To-Do List window adjacent to the entry field.

   4. Change the text beneath the object factory icon to ItemFactory.

 Specifying the type of objects the object factory can create

   1. Move the mouse pointer to the object factory, click mouse button 2, and
      select Change Type.

      Visual Builder displays a window in which you are to enter the type of
      objects that the object factory is to create.

   2. Enter ToDoItem* in the entry field in this window.

   3. Select the OK push button.

      The object factory can now create only ToDoItem objects.


ΓòÉΓòÉΓòÉ 44.5. Place and modify an IVSequence* part ΓòÉΓòÉΓòÉ

You also need to place an IVSequence* part to put the objects that the
IVBFactory* part creates into a sequence; you must also specify the type of
objects the sequence can contain.

Placing an IVSequence* part on the free-form surface

   1. Select OptionsAdd part.

      Visual Builder displays the Add part window.

   2. Enter ItemSequence in the Name field.

   3. Enter IVSequence* in the Part class field.

   4. Select the Add push button.

   5. Place an IVSequence* part on the free-form surface surface to the right
      of the To-Do List window adjacent to the list box.

 Specifying the type of objects in the sequence

   1. Move the mouse pointer to the sequence, click mouse button 2, and select
      Open Settings.

      Visual Builder displays the settings notebook for the sequence.

   2. Enter ToDoItem* in the Class name of items field.

   3. Select the OK push button.

      The sequence can now accept only ToDoItem objects.


ΓòÉΓòÉΓòÉ 44.6. Make the new connections ΓòÉΓòÉΓòÉ

The following steps describe the connections that this example requires to add
objects to and remove objects from the list box. To review the instructions for
connecting features, see Making the Connections.

   1. Connect the buttonClickEvent feature of the Add push button to the new
      action of the object factory.

      This connection causes the object factory to create a new ToDoItem object
      whenever a user clicks the Add push button.

   2. Connect the toDoItemName attribute of the object factory to the text
      attribute of the entry field.

      This connection causes text in the entry field to be used as the name of
      ToDoItem objects that the object factory creates. Notice that the
      connection line is violet, the color of a parameter connection, instead
      of cyan, which is the color of an attribute-to-attribute connection. The
      connection line is violet because the text attribute of the entry field
      supplies a value for the toDoItemName attribute only when the object
      factory creates a new object, just as if it were satisfying a parameter
      of the new action.

   3. Connect the newEvent attribute of the object factory to the addAsLast
      action of the sequence.

      This connection causes each new ToDoItem object to be added as the last
      object in the sequence.

   4. Connect the this attribute of the sequence to the items attribute of the
      list box.

      This connection causes the list box to display all of the ToDoItem
      objects that the sequence contains.

   5. Connect the buttonClickEvent feature of the Remove push button to the
      removeAtPosition action of the sequence.

      This connection causes the object at a specified position in the sequence
      to be removed. This connection is incomplete because the removeAtPosition
      action's position parameter must be satisfied.

   6. Connect the position parameter of the previous connection to the
      selectedCollectionPosition attribute of the list box.

      This connection provides the position of the selected item in the
      collection of objects, which is required by the previous connection in
      order to remove an object.


ΓòÉΓòÉΓòÉ 44.7. Generate the source code for my visual part and main() procedure ΓòÉΓòÉΓòÉ

To generate the C++ source code for your visual part, select FileSave and
GeneratePart source. Visual Builder generates the following files in the
working directory:

 todolst2.cpp   The C++ code for your todolst2 part.
 todolst2.hpp   The C++ header file for your todolst2 part.
 todolst2.h     The resource header file for your todolst2.cpp file.
 todolst2.rc    The resource file for your todolst2.cpp file.

 Generating the source code for your main() procedure

 To generate the source code for your main() procedure, select FileSave and
 Generatemain() for part. Visual Builder generates the following files in the
 working directory:

 todolst2.app   The main function for your application.

                Note:  If you start Visual Builder from a WorkFrame project,
                       the name of this file is vbmain.cpp.
 todolst2.mak   The make file that you specify when you build your application.

                Note:  You must select OptionsGenerate make files in the
                       Visual Builder window to generate this file.


ΓòÉΓòÉΓòÉ 44.8. Build and run the modified application ΓòÉΓòÉΓòÉ

You should now be ready to build and run your modified To-Do List application,
as follows:

Building the new To-Do List application

   1. Open an OS/2 window.

   2. Change to your Visual Builder working directory.

   3. Enter the following command:

            nmake todolst2.mak

      This command produces the following files:

      todolst2.exe        The executable file for your application.
      todolst2.map        The application configuration map.
      todolst2.o          The object file for your application.

                          Note:  If you start Visual Builder from a WorkFrame
                                 project, the name of this file is vbmain.obj.
      todolst2.obj        The object file for your part. Visual Builder
                          provides a separate object module for your part that
                          is used when compiling this part with other parts.
      todolst2.res        The binary resource file that is bound to
                          todolst2.exe.

 Running the new To-Do List application

 To run your application from the same OS/2 command prompt from which you
 entered the nmake command, enter the following:

  todolst2

 Once your application is running, experiment with it to make sure it works as
 you designed it. That is all there is to it!

 You can add a finishing touch to your application by creating an OS/2 program
 object. Create a program object from the OS/2 Templates folder, specifying the
 name todolst2.exe as the program name and the directory that contains
 todolst2.exe as the working directory. Once you have done this, you can run
 your application by simply double-clicking on the program object you just
 created.


ΓòÉΓòÉΓòÉ 45. ...Create resizable windows ΓòÉΓòÉΓòÉ

     Adding a multicell canvas

     Adding parts to the multicell canvas

     Changing the multicell canvas grid

     Extending a part to span more than one cell

     Adding a group box

     Changing the settings for a multicell canvas


ΓòÉΓòÉΓòÉ 45.1. Add a multicell canvas ΓòÉΓòÉΓòÉ

This example is based on OAContractView, found in oawin.vbb.

   1. Because you are constructing a new user interface, begin by creating a
      visual part. Call it contractView.

      When you create a visual part, the Composition Editor opens and an
      IFrameWindow* part is automatically added for you. By default, the client
      area of the IFrameWindow* part appears as a canvas.

   2. Delete the default canvas client.

   3. Select , the Composers category, from the left side of the parts palette.

   4. Select , the IMultiCellCanvas* part, from the right side of the parts
      palette and drop it on the IFrameWindow* part.

 Your visual part now looks like the following figure:

 The next step is adding parts to the multicell canvas.


ΓòÉΓòÉΓòÉ 45.2. Add parts to the multicell canvas ΓòÉΓòÉΓòÉ

When you first drop a multicell canvas, the cell grid appears at its default
size in the upper-left corner of the client area. You can now drop parts into
the canvas. For the contractView example, do the following:

   1. Select , the Data Entry category, from the left side of the parts
      palette.

   2. Select , the IStaticText* part, from the right side of the parts palette.
      When you move the mouse pointer over the free-form surface, the pointer
      changes to crosshairs.

   3. Drop the part at cell (2,2) of the multicell canvas.

      Row 1 was left as a spacer between the top of the multicell canvas and
      the window border. When you drop the IStaticText* part, cell (2,2)
      expands to contain the dropped part. The multicell canvas now looks like
      the following figure:

   4. Drop another IStaticText* part at cell (4,2), leaving row 3 as a spacer.
      The multicell canvas now looks like the following figure:

   5. Drop two more IStaticText* parts into the expansion area below the
      StaticText2 part.

      Each time you drop a part into the expansion area, a new row is created
      for you.

   6. Drop three more IStaticText* parts in column 3 as shown in the following
      figure:

      No spacer rows exist yet between these new rows. We will add these in
      Adding Rows or Columns. Now add some IEntryField* parts.

   7. Select , the Data Entry category, from the left side of the parts
      palette.

   8. Select , the IEntryField* part, from the right side of the parts palette.

   9. Drop IEntryField* parts in the expansion area to the right of the
      IStaticText* parts, starting at row 2. A new column 6 is created, as
      shown in the following figure:


ΓòÉΓòÉΓòÉ 45.3. Change the multicell canvas grid ΓòÉΓòÉΓòÉ

You can add or delete rows or columns from a multicell canvas as follows:

     To add rows or columns from the expansion area, you can just drop parts
      into it, as discussed in Adding Parts to the Multicell Canvas.

     To add several rows or columns at a time, you might find it easiest to
      change the grid using the multicell canvas's settings notebook. This
      method is discussed in Changing the Multicell Canvas Grid Using the
      Settings Notebook.

     With the multicell canvas selected, you can press mouse button 2 and use
      the contextual menu. For more information on this method, see the
      following:

        -  Adding Rows or Columns Using the Contextual Menu

        -  Deleting Rows or Columns Using the Contextual Menu


ΓòÉΓòÉΓòÉ 45.3.1. Add rows or columns using the contextual menu ΓòÉΓòÉΓòÉ

You can add rows or columns anywhere on the multicell canvas as follows:

   1. Select a cell next to where you want to add the row or column.

      Note:  No selection handles are shown on the cell if it is empty. Also,
             you can only open the contextual menu for an empty cell.

   2. Press mouse button 2 to open the contextual menu.

   3. To add a row, select Rows. To add a column, select Columns.

      A cascade menu appears.

   4. If you want to insert the row above the cell you selected, select Add row
      before from the cascade menu.

      If you want to insert the row below the cell you selected, select Add row
      after from the cascade menu.

      For columns, Add column before inserts a column to the right of the
      selected cell. Add column after inserts a column to the left of the
      selected cell.

 For practice, add spacer rows to the contractView example as follows:

   1. Select the empty cell to the left of StaticText3.  Add a row after it.

   2. Add one row each after StaticText4 through StaticText7.

 At this point, the contractView window looks like the following figure:


ΓòÉΓòÉΓòÉ 45.3.2. Delete rows or columns using the contextual menu ΓòÉΓòÉΓòÉ

You can delete rows or columns from anywhere on the multicell canvas as
follows:

   1. Select a cell in the row or column you want to delete.

   2. Press mouse button 2 to open the contextual menu.

   3. To delete the row, select Rows. Then select Delete row.

      To delete the column, select Columns. Then select Delete column.


ΓòÉΓòÉΓòÉ 45.4. Extend a part to span more than one cell ΓòÉΓòÉΓòÉ

Build a deck of push buttons using an ISetCanvas* part as a base, as follows:

   1. Drop an ISetCanvas* part in the bottom expansion area of column 2.

   2. Extend the span of the ISetCanvas* as follows:

        a. Select the ISetCanvas* part.

        b. Holding the Alt key with one hand, drag either right-hand part
           handle over to the column that contains the IEntryField* parts.

        c. Release the mouse.

   3. Add three IPushButton* parts to the ISetCanvas* part.

      The ISetCanvas* and multicell canvas parts expand to contain the newly
      dropped IPushButton* parts.

                     To change the way minimum size is calculated for the
                     IPushButton* parts, edit Pack Type settings for the
                     ISetCanvas* part.

   4. Edit the IStaticText* parts so that they appear as shown in the following
      figure: Extend each column 2 IStaticText* part into column 3.


ΓòÉΓòÉΓòÉ 45.5. Add a group box ΓòÉΓòÉΓòÉ

In the contractView sample, the column 3 IStaticText* parts and their entry
fields belong to the Position Details group shown in the following figure:

The group box will extend from cell (10,2) to cell (18,8).

Adding the extra rows and columns to hold the group box

Extra cells are necessary to hold the group box and provide space between the
group box and the parts within it.

   1. Add 2 rows above Title.

   2. Add 2 rows after Contractor.

   3. Add 2 columns after the corresponding IEntryField* parts.

 The sample window now looks like the following figure:

 Dropping and extending the group box

   1. Select , the Data Entry category, from the left side of the parts
      palette.

   2. Select , the IGroupBox* part, from the right side of the parts palette.

   3. Drop the IGroupBox* part into cell (10,2).

      This temporarily distorts the multicell canvas. Resize the IFrameWindow*
      part to see the extra columns on the right.

   4. Select the IGroupBox* part. Holding the Alt key with 1 hand, drag the
      lower right part handle to cell (18,8) as shown in the following figure:

      If necessary, press Alt-Backspace to undo and retry. Edit the IGroupBox*
      text to read Position Details. Remember to move the IGroupBox* part up in
      the tabbing and depth order.


ΓòÉΓòÉΓòÉ 45.6. Change the settings for a multicell canvas ΓòÉΓòÉΓòÉ

You can use the General page of the multicell canvas settings notebook to do
the following:

     Move a dropped part

     Change the default minimum size for rows or columns

     Add rows or columns

     Delete rows or columns

     Make fixed rows and columns expandable

 This page consists of a series of directly editable tables.


ΓòÉΓòÉΓòÉ 45.6.1. Move dropped parts ΓòÉΓòÉΓòÉ

From the free-form surface, you can move dropped parts by selecting and
dragging them to their new locations. You can also move dropped parts between
cells in a multicell canvas using the settings notebook as follows:

   1. Open settings for the multicell canvas.

   2. At the top of the General page is a scrollable list of all parts
      contained in the multicell canvas as shown in the following figure:

   3. Select the table entry you want to change and edit the highlighted value.
      Row and column numbering starts from (1,1) in the upper-left corner of
      the multicell canvas.

   4. Select the OK push button to close settings.

 Use this table for reference whenever you edit row and column settings.


ΓòÉΓòÉΓòÉ 45.6.2. Change default minimum size for rows or columns ΓòÉΓòÉΓòÉ

You can change the minimum size of a row or column when it is empty. As stated
previously, the default minimum size is 10 pixels wide (columns) and 10 pixels
high (rows), but you can change the default minimum size for individual rows
and columns as follows:

   1. Open settings for the multicell canvas.

   2. The second table on the General settings page is called Rows, as shown in
      the following figure:

   3. The default height appears as nil. To change the minimum height for row
      1, select the Row 1 table entry under Height. Change this to the new
      default value in pixels. For example, the minimum height of row 1 in most
      views of the OASearch sample application is 20.

   4. Scroll down the General page a little more to see the third table on the
      page, called Columns. You can edit values in this table in the same way
      you edited the Rows table.

   5. Select the OK push button to close settings.


ΓòÉΓòÉΓòÉ 45.6.3. Add rows or columns using the settings notebook ΓòÉΓòÉΓòÉ

To save time when adding more than one row or column at a time, use the
settings notebook. The methods for adding rows and columns are similar, as
follows:

   1. Open settings for the multicell canvas. The tables on the General page
      are described in Moving Dropped Parts and Changing Default Minimum Size
      for Rows or Columns

   2. If necessary, scroll down to the Rows table. For a complex layout,
      consider resizing the window so that the Controls table is also
      displayed.

   3. Select the number of a row next to the insertion point. Select the Add
      push button.

   4. Select either Add before or Add after.

          Add before inserts the new row above the selected row.
          Add after inserts the new row below the selected row.

   5. Select the OK push button to close settings.


ΓòÉΓòÉΓòÉ 45.6.4. Delete rows or columns using the settings notebook ΓòÉΓòÉΓòÉ

To save time when deleting more than one row or column at a time, use the
settings notebook. The methods for deleting rows and columns are similar, as
follows:

   1. Open settings for the multicell canvas. The tables on the General page
      are described in Moving Dropped Parts and Changing Default Minimum Size
      for Rows or Columns

   2. If necessary, scroll down to the Rows table. For a complex layout,
      consider resizing the window so that the Controls table is also
      displayed.

   3. Select the number of the row you want deleted. Select the Delete push
      button.

   4. Select the OK push button to close settings.


ΓòÉΓòÉΓòÉ 45.6.5. Make rows or columns expandable ΓòÉΓòÉΓòÉ

The methods for making rows and columns expandable are similar, as follows:

   1. Open settings for the multicell canvas. The tables on the General page
      are described in Moving Dropped Parts and Changing Default Minimum Size
      for Rows or Columns

   2. If necessary, scroll down to the Rows table. For a complex layout,
      consider resizing the window so that the Controls table is also
      displayed.

   3. The default expansion value appears as nil. Select the appropriate entry
      from the Rows table under Expand. For the contractView example, select
      the row 19 entry.

   4. The value d is highlighted. Change it to y and select the Apply push
      button.

   5. Move the settings notebook window over so you can see the result of your
      work, as shown in the following figure:

      The expansion area is now hidden. All extra vertical space becomes part
      of row 19.

   6. When you are finished adjusting row and column expansion settings, select
      the OK push button.

 To make this row fixed later, enter n in the Expand column.


ΓòÉΓòÉΓòÉ 46. ...Construct containers and notebooks ΓòÉΓòÉΓòÉ

     Adding container parts

        -  Setting up the container

        -  Adding container columns

        -  Filling the container

     Adding notebook parts

        -  Adding the notebook

        -  Adding notebook pages


ΓòÉΓòÉΓòÉ 46.1. Add container parts ΓòÉΓòÉΓòÉ

In this section, you set up a container in the OASkillView part to hold the
OASkill* objects returned as a result of a user's skill query. The completed
window looks like the following figure:

This example is based on the OASkillView* part, found in oawin.vbb. Before
constructing this new visual part, make sure that oanonvis.vbb is loaded into
Visual Builder.

   1. Create a new visual part and name it OASkillView.

      A frame window and default canvas appear.

   2. Select , the Lists category, from the left side of the parts palette.

   3. Select , the IVBContainerControl* part, from the right side of the parts
      palette and drop the part onto the default canvas.

   4. Change the container's name to SkillCnr.

   5. Resize the container part as needed.

 The next step is Setting Up the Container.


ΓòÉΓòÉΓòÉ 46.1.1. Set up the container ΓòÉΓòÉΓòÉ

You set some container values in the container part and some in the container
column part. Set the following values in the container part:

     Title and title format
     View style
     Type of contained objects

 Set the following values in the container column parts:

     Column title and width
     Attribute to appear in the column
     Vertical and horizontal separators
     Whether contents can be changed by the user
 Adding Container Columns.

 Setting the container titles

   1. Open the settings notebook for SkillCnr.

   2. Specify the general settings. In the Title Attributes group, type
      Contractors Holding This Skill into the Title field.

   3. Select both Show title and Show title separator.

   4. Select the Left radio button for left title alignment.

 Specifying the container type and layout

   1. Select showDetailsView from the View type list box.

   2. Scroll down on the General page. In the Container Item Attributes group,
      type OASkill into the Part type field.

   3. Select contractorID from the Text drop-down combination box. The Text
      field specifies which OASkill attribute would appear as text in the
      container's icon view.

   4. The Icon field specifies the icon to be used for each item in the
      container. Type the following into the Icon field:

            #IDynamicLinkLibrary("cppov33r").loadIcon(803)

      cppov33r.dll is the resource DLL containing the icons for this
      application, and 803 is the resource ID for the skill icon that would
      appear in the container's icon view.

   5. Select the Refresh container after changes check box.

   6. Select the OK push button to save and close the settings notebook.


ΓòÉΓòÉΓòÉ 46.1.2. Add container columns ΓòÉΓòÉΓòÉ

Once you have added a container, add container columns. This is a good idea
even if you intend for the container to be used mainly as an icon view.

   1. Select , the Lists category, from the parts palette.

   2. Select the Sticky check box.

   3. Select , the IContainerColumn* part, from the parts palette.

   4. Drop two IContainerColumn* parts on the SkillCnr part.

 Setting up the container columns

   1. Open up the settings notebook for the first container column.

   2. On the General settings page, type Contractor ID in the Heading text
      field.

   3. Specify the column's width (in pixels) in the Width field. For this
      example, enter 200.

   4. Specify the OASkill attribute to appear in this column. Select the Use
      the Text attribute set in the container radio button because you want to
      display the same information in this container column that the container
      displays as text on the icon view.

   5. Set the container so that its elements cannot be changed by the user.
      Select the following from the Styles settings page:

          For the readOnlyHeading style, select the On radio button.
          For the readOnly style, select the On radio button.

   6. Set a vertical separator for container column 1 only. For the
      verticalSeparator style, select the On radio button.

   7. Select the OK push button to close the settings notebook.

 Repeat this procedure for the second container column, adjusting the width of
 the column to fit. The second column is supposed to display the number of
 years of experience each contractor has for a certain skill, so use the
 following settings:

     Select the Use an attribute from the part radio button
     Choose yearsExp to populate the container column.
     Do not add a vertical separator.

 The next step is Filling the Container.


ΓòÉΓòÉΓòÉ 46.1.3. Fill the container ΓòÉΓòÉΓòÉ

The easiest way to fill the container is to use a collection part. The
OASkillView part uses an IVSequence* part named SkillList.

Adding the nonvisual parts

The OASearch application uses static parts that are actually found in OAMain
part. All nonvisual parts in this view except SkillList are variables that will
be connected later to the actual parts.

   1. Add an OASkill* part as a variable. Name it Skill.

      For help on how to do this, see Adding a Variable to a Composite Part.

   2. Add an OASkillBase* part as a variable. Name it SkillBase.

   3. Add an IVSequence* part. Name it SkillList.

   4. Add an IMessageBox* part to handle exceptions.

 Populating the collection

 The SkillBase part contains the action (getSkills) needed to populate the
 skill list. The getSkills action takes two parameters, a skill description and
 a sequence. Make the following connections:

 From                             To

 Skill,#skillName                 EntryField1,#text

 PushButton1,#buttonClickEvent    SkillBase,#getSkills

 Skill,#skillName                 The aSkillName parameter of the
                                  PushButton1,#buttonClickEvent-->
                                  SkillBase#getSkills connection

 SkillList,#this                  The aList parameter of the
                                  PushButton1,#buttonClickEvent-->
                                  SkillBase#getSkills connection

 To handle exceptions, connect the exceptionOccurred feature of the getSkills
 connection to the showException feature of the message box part.

 Connecting parts to fill the container

 To fill the container, connect the this attribute of the SkillList part to the
 items attribute of the container.


ΓòÉΓòÉΓòÉ 46.2. Add notebook parts ΓòÉΓòÉΓòÉ

The purpose of this section is to guide you through using a notebook part to
create the OAContractorView part. The completed window looks like the following
figure:

The steps in creating a notebook are as follows:

     Add the notebook and set it up.
     Add notebook pages and set them up.

 Begin by adding the notebook.


ΓòÉΓòÉΓòÉ 46.2.1. Add the notebook ΓòÉΓòÉΓòÉ

Before constructing this new visual part, make sure that oanonvis.vbb is loaded
into Visual Builder.

   1. Create a new visual part. Call it OAContractorView.

      A frame window and default canvas appear.

   2. Delete the default canvas part from the frame window and resize the
      window as necessary.

   3. Select , the Composers category, from the left side of the parts palette.

   4. Select , the INotebook* part, from the right side of the parts palette
      and drop the part onto the frame window.

 Specifying the notebook layout

 You change the notebook's appearance using its settings notebook. As you make
 selections, notice that the Preview area changes to reflect your choices.

   1. Open the settings notebook for the notebook part.

   2. On the General settings page, select the icon that represents the
      orientation that you want for the notebook. For this example, select from
      the Layout group.

   3. From the Binding group, select the Spiral radio button.

   4. From the Tab Shape group, select the Round radio button.

   5. From the Justification group, select the two Center radio buttons.

   6. Select the OK push button to close the settings notebook.

 The next step is adding notebook pages.


ΓòÉΓòÉΓòÉ 46.2.2. Add notebook pages ΓòÉΓòÉΓòÉ

You add notebook pages using the notebook part's Composition Editor contextual
menu.

   1. To add the first page of the notebook, select Add initial page.

   2. To add each additional page, select Add page before or Add page after.
 For this example, add one page after the initial page.

 Setting up the notebook page and tab

   1. Open the settings notebook for the first notebook page.

                     To open the settings for the notebook page instead of the
                     canvas that is on the notebook page, move the mouse
                     pointer to the small area around the canvas before opening
                     the settings.

   2. On the General page, type ContactPage into the Subpart name field.

   3. Type Contact into the Tab text field. This text is what appears on the
      notebook tab.

   4. Type Vital statistics into the Status text field. This text is what
      appears in the status area at the bottom of the notebook page.

   5. On the Style page, select the On radio button for the following styles:

          The autoPageSize style, to enable automatic sizing of the notebook
           page

          The statusText style, to enable display of the status text that you
           entered in the previous step to be displayed

          The majorTab style, to give the notebook page a major tab

 Adding parts to a notebook page

 Each notebook page initially contains an ICanvas* part. If you want to use a
 different part, delete the ICanvas* part and select another part from the
 Composers category, such as IMultiCellCanvas*.

 Note:  A notebook page allows only one subpart, which should be a part from
        the Composers category. You can, of course, add other subparts to the
        Composers part.

 The ContactPage subpart contains the primitive parts shown in the following
 figure:

 To see the other notebook pages, open the OAContractView part in oawin.vbb.


ΓòÉΓòÉΓòÉ 47. ...Add menus to my application ΓòÉΓòÉΓòÉ

     Adding a menu bar

     Connecting the menu bar to the window

     Adding menu choices

     Adding menu separators

     Connecting menu choices to actions

 Begin with adding a menu bar to the window.


ΓòÉΓòÉΓòÉ 47.1. Add a menu bar ΓòÉΓòÉΓòÉ

Begin by opening the visual part that contains the OASearch welcome window, the
OAMain part.

   1. Select , the Frame Extensions category, from the left side of the parts
      palette.

   2. Select , the IMenu* part, from the right side of the parts palette and
      drop it on the free-form surface next to the window, as shown in the
      following figure:

   3. To add two of the menu choices to the menu bar, add two menu parts on top
      of the menu part for the menu bar.

      As you add each menu part, a cascade button part is added to the menu bar
      and a connection is made between the cascade button part and the menu
      part you added. This connection causes the menu part to be displayed when
      the user selects the cascade button part. See the following figure:

   4. Edit the text of the menu choices as shown in the following figure: To do
      this, select each one and press Alt-mouse button 1.


ΓòÉΓòÉΓòÉ 47.2. Connect the menu bar to the window ΓòÉΓòÉΓòÉ

To make the menu a menu bar, connect the this attribute of the IMenu* part to
the menu attribute of the window part. Although the menu continues to appear
vertically on the free-form surface, this connection defines the menu part as a
menu bar.

           Since the menu bar is shown outside the frame window, be sure to
           leave enough space for it below the window title.

 Making this same connection to a part other than a window part, such as a list
 part, makes the menu part a pop-up menu instead of a menu bar.

 Now that the menu bar has been added, the next step is adding the menu
 choices.


ΓòÉΓòÉΓòÉ 47.3. Add menu choices ΓòÉΓòÉΓòÉ

Once the menu structure is complete, you need to add menu choices that do
something other than open other menus.

   1. Select , the Frame Extensions category, from the left side of the parts
      palette.

   2. Select , the IMenuItem* part, from the right side of the parts palette.

   3. The position at which you click the mouse is where the part is added
      within the menu. Drop menu items as follows:

          One part as the last item in the Menu1 part
          Four items in the Menu2 part
          Two items in the Menu3 part

 You can change the position of a menu choice part within the menu part by
 using mouse button 2 to drag each item to a new position. Position these parts
 and change their text as shown in the following figure: The next step is
 connecting menu choices to actions.


ΓòÉΓòÉΓòÉ 47.4. Add menu separators ΓòÉΓòÉΓòÉ

Once you have added and edited the OAMain menu items, add a separator bar to
Menu2 between Skill and General Information as follows:

   1. Select , the Frame Extensions category, from the left side of the parts
      palette.

   2. Select , the IMenuSeparator* part, from the right side of the parts
      palette.


ΓòÉΓòÉΓòÉ 47.5. Connect menu choices to actions ΓòÉΓòÉΓòÉ

Once you have added menu choices, you can connect them to actions in this or
other parts. As an example, connect the Exit menu bar item so that when the
item is selected, the main window closes, as follows:

 From part, feature            To part, feature

 ExitMI,#commandEvent          FrameWindow,#close

 Command events occur when a user selects a menu item, push button, or
 accelerator key. In this case, the user' selection of Exit generates a command
 event to perform the close action on the Frame Window.

 Note:  You cannot promote menu item events to the part interface.

 The other menu choices, shown in the following figure, connect to other parts
 that are not on this free-form surface. These connections are completed in
 Completing the Menu Bar.


ΓòÉΓòÉΓòÉ 48. ...Add help to Visual Builder applications ΓòÉΓòÉΓòÉ

     Creating the help file

     Providing context-sensitive help

     Providing general help

     Providing the application help window

     Providing help for factory-generated frame windows

     Providing a Help push button

     Displaying fly-over help when the mouse pointer is over a part

     Displaying help in an information area


ΓòÉΓòÉΓòÉ 48.1. Create the help file ΓòÉΓòÉΓòÉ

Before we can connect the help, we must first create the help file.

Writing the help

For convenience sake, we have provided the help source so you do not have to
retype it. Double-click here to see the help source and select Copy from the
Services pull-down menu to copy the panel text to the system clipboard. Using
your favorite editor, create a new file and paste this text into the file.

           When creating your own help files, try using a Project Smarts IPF
           template, which provides the basic tags for creating online help
           using the OS/2 Information Presentation Facility. For more
           information on writing online help, refer to the OS/2 Information
           Presentation Facility Guide and Reference.

 Save this file with a name similar to cppov33.ipf.ipf.

 Building the help file

 Ensure that you have the IPF compiler installed on your system and that your
 environment variables are set up to run the IPF compiler. The IPF compiler
 comes with the OS/2 2.1 Toolkit and the OS/2 Warp Toolkit.

 To build the help file, simply run the Information Presentation Facility (IPF)
 compiler. For example, if you saved your help file with the name cppov33.ipf,
 you would enter the following command in the directory where you saved your
 file:

  ipfc cppov33.ipf

 This command generates a file called cppov33.hlp.

 You have now built your help file. The next step is to provide
 context-sensitive help in your application.


ΓòÉΓòÉΓòÉ 48.2. Sample Help Source Code ΓòÉΓòÉΓòÉ

:userdoc.
:title.Opportunities Abound Databases Help
:docprof toc=1 ctrlarea=page.
:ctrl ctrlid=buttons controls='ESC SEARCH PRINT' page.
:h1 res=9998.
General Help for the Opportunities Abound Databases
:i1.general help
:p.Text goes here.
:h1 res=9999.
Request for Skill Information Help
:i1.requesting skill information, help for
:p.Text goes here.
:h1 id=10000.
Skill Information Help
:i1.skill information, help for
:p.Text goes here.
:h1 res=10001.
Request for Contract Information Help
:i1.requesting contract information, help for
:p.Text goes here.
:h1 res=10002.
Contract Information Help
:i1.contract information, help for
:p.Text goes here.
:h1 res=10003.
Request for Contractor Information Help
:i1.requesting contractor information, help for
:p.Text goes here.
:h1 res=10004.
Contractor Information Help
:i1.contractor information, help for
:p.Text goes here.
:euserdoc.


ΓòÉΓòÉΓòÉ 48.3. Provide context-sensitive help ΓòÉΓòÉΓòÉ

This section tells you how to provide context-sensitive help for subparts in
your application.

For this example, we use the graphic push buttons on the window.

To provide context-sensitive help for a subpart, do the following:

   1. Open the cppov33.ipf file in your text editor and find the "Request for
      Skill Information Help" heading.

      Above this heading is the heading tag, :h1, with a res attribute. This
      attribute contains the resource number for the help panel for the Skills
      push button.

   2. Open the settings notebook for the subpart, in this case the Skill push
      button.

   3. Select the Control page. It looks like the following figure:

   4. Enter the resource number for the Skills push button help panel in the
      Help panel id field.

      When you generate the code for your application, Visual Builder creates a
      help table in the resource (.rc) file that it generates and inserts this
      number into the help table.

   5. If the Enable check box is not checked, select it.

   6. Select the OK push button.

   7. Repeat steps 2 through 6 for the Contract push button and the Contractor
      push button. Use the resource numbers for the "Request for Contract
      Information Help" and "Request for Contractor Information Help",
      respectively.

 You have now provided context-sensitive help for the push buttons. The next
 step is to provide general help in your application.


ΓòÉΓòÉΓòÉ 48.4. Provide general help ΓòÉΓòÉΓòÉ

This section tells you how to provide general help for your application. For
this example, we use the frame window.

To provide context-sensitive help for your application, do the following:

   1. Open the cppov33.ipf file in your text editor and find the "General Help
      for the Opportunities Abound Databases" heading.

      Above this heading is the heading tag, :h1, with a res attribute. This
      attribute contains the resource number for the general information help
      panel.

   2. Open the settings notebook for the subpart, in this case the frame
      window.

   3. Select the Control page. It looks like the following figure:

   4. Enter the resource number for the general information help panel in the
      Help panel id field.

      When you generate the code for your application, Visual Builder creates a
      help table in the resource (.rc) file that it generates and inserts this
      number into the help table.

   5. If the Enable check box is not checked, select it.

   6. Select the OK push button.

 You have now provided general help for the main window. The next step is to
 provide a help window to display the help panels in.


ΓòÉΓòÉΓòÉ 48.5. Provide the application help window ΓòÉΓòÉΓòÉ

Now that you have added the context-sensitive help and the general help for the
main window, you need a help window to display the help panels in. You must
place an IHelpWindow* part on the free-form surface to give Visual Builder a
window in which to display the help information. The default owner of the
IHelpWindow* part is the primary part for your application. Therefore, no
connections are required.

To add a help window to your application, do the following:

   1. Select , the Other category, on the parts palette.

   2. Select , the IHelpWindow* part, and place it on the free-form surface.

   3. Open the settings notebook for the IHelpWindow* part. It looks like the
      following figure:

   4. In the Title field, enter the title of the help window.

      This must be the same title that you entered on the :title tag in your
      .ipf file.

   5. In the Help libraries field, enter the name of the help file that you
      compiled, such as oasearch.hlp.

      If you had created multiple help files for your application, you would
      enter all of their names in this field.

   6. We recommend that you leave the Help table id field empty and let Visual
      Builder generate it for you unless you need a specific help table ID.
      Otherwise, you could have conflicts in your resource (.rc) file.

   7. Select the OK push button.


ΓòÉΓòÉΓòÉ 48.6. Provide help for factory-generated frame windows ΓòÉΓòÉΓòÉ

You can associate a help window with a part that is generated by an object
factory if the base class of that part is IFrameWindow*. To do this, you can do
either of the following:

     Edit the part that the object factory generates, place an IHelpWindow*
      part on the free-form surface next to it, and do all the things described
      in the preceding sections to use the help window properly. Repeat this
      step for each IFrameWindow*-based part that is generated by an object
      factory.

      You should use this method if you have created multiple help library
      (.hlp) files for your library instead of putting all of your help panels
      in one library file.

     Place an IHelpWindow* part on the free-form surface in the same view with
      the object factory if you have created only one help library file for all
      of your help panels. Then, do the following:

        1. Open the settings notebook for the IHelpWindow* part.

        2. Enter the help window title and the name of the library (.hlp) file.

        3. Close the settings notebook by selecting the OK push button.

        4. Connect the newEvent feature of the object factory to the
           setAssociatedWindow action of the help window.

        5. Repeat step 4 for each object factory in the view.

        6. Edit each IFrameWindow*-based part that an object factory generates
           and specify the appropriate help panel IDs for the subparts that you
           want to provide help for. Each help panel ID must be a resource ID
           in the library file that you specified in step 2.


ΓòÉΓòÉΓòÉ 48.7. Provide a Help push button ΓòÉΓòÉΓòÉ

To provide a Help push button in your application, do the following:

   1. Select , the Buttons category, in the left-hand column on the parts
      palette.

   2. Select , the IPushButton* part, and place it where you want it to be.

   3. Change the text on the push button to Help.

   4. Open the settings notebook for the push button.

   5. Select the Styles tab.

   6. Find help on the Styles page and select the On radio button.

      This style turns a regular push button into a help push button.

   7. On the same page, find noPointerFocus and select the On radio button.

   8. Select the OK push button to close the settings notebook.

 You now have a Help push button. If you have followed the steps in the
 preceding sections, clicking this button causes the contextual help panel for
 the part that currently has the input focus to be displayed. If no part has
 the focus, the main help panel for the window is displayed. The behavior of
 the Help push button is identical to that of the F1 key.

 To provide a help panel for the Help push button itself, follow the
 instructions in


ΓòÉΓòÉΓòÉ 48.8. Display fly-over help when the mouse pointer is over a part ΓòÉΓòÉΓòÉ

Your application can provide the following types of fly-over help:

     A short text string that your application displays next to the subpart
      that the mouse pointer is over

     A longer text string that your application displays in a text control

 Providing fly-over help for a subpart

 To provide fly-over help for a subpart, do the following:

   1. Place an IVBFlyText* part on the free-form surface by doing the
      following:

        a. Select , the Other category, on the parts palette.

        b. Select , the IVBFlyText* part, and place it on the free-form
           surface.

   2. Add fly-over help text to one or more subparts by doing the following:

        a. Open the settings notebook for a subpart, such as an entry field or
           push button.

        b. Select the Control notebook tab.

        c. Enter fly-over text strings in the Fly over short text field, the
           Fly over long text field, or both.

        d. Select the OK push button to save the text strings that you just
           entered.

 That is all you need to do. There are no connections to make.


ΓòÉΓòÉΓòÉ 48.9. Display help in an information area ΓòÉΓòÉΓòÉ

The following sections provide specific information about displaying help in an
information area:

     Adding an information area to a frame window

     Displaying help for menu choices in an information area

     Displaying information about successful actions


ΓòÉΓòÉΓòÉ 48.9.1. Add an information area to a frame window ΓòÉΓòÉΓòÉ

To add an information area to a frame window, do the following:

   1. Select , the Frame Extensions category, on the parts palette.

   2. Select , the IInfoArea* part.

   3. Move the mouse pointer over the title bar or window border of the frame
      window and click mouse button 1.

      Visual Builder places an information area at the bottom of the frame
      window.

   4. Open the settings notebook for the information area.

   5. Enter text that you want your application to display in the following
      fields:

      Disabled text
             Text to display when the selected menu choice is disabled.

      Inactive text
             Text to display when no menu choice is selected.

      Missing text
             Text to display when the information area cannot find and display
             specific help for a menu choice.


ΓòÉΓòÉΓòÉ 48.9.2. Display help for menu choices in an information area ΓòÉΓòÉΓòÉ

To display help text for menu choices in an information area, do the following:

   1. Create the menu bar and pull-down menus for your application.

   2. Open the settings notebook for each menu choice.

   3. Enter a description of the menu choice in the Info area text field.

   4. Select the OK push button to save the description you just entered.


ΓòÉΓòÉΓòÉ 48.9.3. Display long fly-over text in an information area ΓòÉΓòÉΓòÉ

To display a long fly-over text string in an information area, do the
following.

Note:  The following steps assume that you have already added an IVBFlyText*
       part and an IInfoArea* part to a frame window. If you have not, you
       should complete the steps in the following sections and then return
       here.

     Displaying Fly-over Help When the Mouse Pointer Is Over a Part

      When following these steps, make sure you enter a text string in the Fly
      over long text field in the settings notebook for a subpart, such as an
      entry field or push button.

     Adding an Information Area to a Frame Window

   1. Display the connection menu for the information area.

   2. Select the this attribute.

   3. Display the connection menu for the fly-over text part.

   4. Select the longTextControl attribute.

 That is all you have to do.


ΓòÉΓòÉΓòÉ 48.9.4. Display information about successful actions ΓòÉΓòÉΓòÉ

To display information in an information area when an action or member function
completes successfully, do the following:

   1. Create an event-to-attribute connection using the text attribute of the
      IInfoArea* part as the target. The source event can be one of the
      following:

          The same event that triggered the action or member function

          The actionResult event of the connection that triggered the action
           or member function

   2. Double-click on the connection you just made to open the settings window
      for the connection.

   3. Select the Set parameters push button to open the Constant Parameter
      Value Settings window.

   4. In the text field, enter the text string that you want to assign to the
      text attribute.

      Your application will display this text string in the information area
      each time the action or member function completes successfully.

   5. Select the OK push button to close the Constant Parameter Value Settings
      window.

   6. Select the Cancel push button to close the connection settings window.


ΓòÉΓòÉΓòÉ 49. ...Integrate visual parts into a single application ΓòÉΓòÉΓòÉ

     Adding nonvisual support parts to the primary part

     Adding static visual parts

     Adding visual parts as dynamic instances

        -  Adding and setting Object Factory parts

        -  Adding variable parts

        -  Connecting to the Object Factory parts

        -  Connecting the Object Factory parts to their corresponding variable
           parts

     Making the final connections

        -  Connecting the nonvisual parts to the variables that represent them

        -  Completing the menu bar


ΓòÉΓòÉΓòÉ 49.1. Add nonvisual support parts to the primary part ΓòÉΓòÉΓòÉ

For this example, refer to the primary view, OAMain, in oawin.vbb, shown in the
following figure:

   1. Begin by building the primary part as you would any IFrameWindow*-based
      part. For information about building the menu bar, see Adding Menus to
      Your Application.

   2. The OASearch application starts up with a small number of static
      nonvisual instances to support the visual parts. Add the following parts:

          OAContractor*.  Name it Contractor.
          OAContract*.  Name it Contract.
          OASkill*.  Name it Skill.
          OASkillBase*.  Name it SkillBase.

      You must connect these part instances to the variables that represent
      them in the other visual parts. First, you must add the visual parts.


ΓòÉΓòÉΓòÉ 49.2. Add static parts ΓòÉΓòÉΓòÉ

One visual part, OAGenInfo, exists statically in the OASearch application as a
modal window. The disadvantage of using static visual parts is that once the
user closes the window, the part is destroyed and cannot be instantiated again
in the same session.

Add the OAGenInfo* part. Name it VBDevelopment. You must also connect
OAGEnInfo* to the menu item that causes it to display. For details, see
Completing the Menu Bar.


ΓòÉΓòÉΓòÉ 49.3. Add visual parts as dynamic instances ΓòÉΓòÉΓòÉ

Implementing dynamic parts involves the following tasks:

     Adding and setting Object Factory parts
     Adding variable parts
     Connecting to the Object Factory parts
     Connecting the Object Factory parts to the corresponding variable parts

 The first step is adding and setting Object Factory parts.


ΓòÉΓòÉΓòÉ 49.3.1. Add and set object factory parts ΓòÉΓòÉΓòÉ

Before you can use Object Factory parts, you must have created the part classes
to be represented. Before you start, be sure to load the .vbb files that
contain those parts into Visual Builder.

Adding the Object Factory parts

   1. Select , the Models category, from the left side of the parts palette.

   2. Select the Sticky check box.

   3. Select , the Object Factory part, from the right side of the parts
      palette.

   4. Drop six Object Factory parts on the free-form surface.

   5. Unload the mouse pointer by selecting , the Selection tool, from the
      Visual Builder tool bar.

 Setting an Object Factory part

   1. Change the part name using the Composition Editor contextual menu.

      In the OASearch example, the Object Factory parts are named as follows:

      ConQFac             Request for Contract Information window
      ConVFac             Contract Information window
      CtrQFac             Request for Contractor Information window
      CtrVFac             Contractor Information window
      SklQFac             Request for Skill Information window
      SklVFac             Skill Information window

   2. Change the part type from the default (IStandardNotifier*) using the
      Composition Editor contextual menu.

      In the OASearch example, the Object Factory parts have the following
      types:

      ConQFac             OAQueryContract*
      ConVFac             OAContractView*
      CtrQFac             OAQueryContractor*
      CtrVFac             OAContractorView*
      SklQFac             OAQuerySkill*
      SklVFac             OASkillView*

   3. Set the Object Factory part to automatically delete each instance, as
      follows:

        a. Open the settings notebook for the part.
        b. Switch to the General page.
        c. Select the AutoDelete check box.


ΓòÉΓòÉΓòÉ 49.3.2. Add variable parts ΓòÉΓòÉΓòÉ

When used with Object Factory parts, variable parts represent the newly created
part instance. Add and set variable parts as follows:

 ContractQ      Set the type to OAQueryContract*.
 ContractorQ    Set the type to OAQueryContractor*.
 SkillQ         Set the type to OAQuerySkill*.
 ContractV      Set the type to OAContractView*.
 ContractorV    Set the type to OAContractorView*.
 SkillV         Set the type to OASkillView*.

 For more information on variables, see Adding a Variable to a Composite Part.


ΓòÉΓòÉΓòÉ 49.3.3. Connect to the object factory parts ΓòÉΓòÉΓòÉ

Once you have added and set both the Object Factory and variable parts, connect
the IGraphicPushButton* parts on the welcome window to the Object Factory parts
representing the query windows, as follows:


 From part, feature             To part, feature

 ContractGB, #buttonClickEvent  ConQFac, #new

 ContractorGB, #                CtrQFac, #new
 buttonClickEvent

 SkillGB, #buttonClickEvent     SklQFac, #new

Next, connect promoted button actions in the query windows to the Object
Factory parts representing the information windows, as follows:


 From part, feature             To part, feature

 ContractQ, #okPB               ConVFac, #new
 ButtonClickEvent

 ContractorQ, #okPB             CtrVFac, #new
 ButtonClickEvent

 SkillQ, #okPBButtonClickEvent  SklVFac, #new


ΓòÉΓòÉΓòÉ 49.3.4. Connect the object factory parts to their corresponding variable parts ΓòÉΓòÉΓòÉ

Once you have set both Object Factory and variable parts, you must connect
them. In OAMain, the connections vary depending on whether the window is modal.
Modal windows retain focus until they are closed; the user cannot switch focus
to another window without closing the modal window. In OAMain, OAGenInfo and
the query windows are modal; the other windows are modeless.

Connections for modal windows

Make the following connections for the query window parts. The connections for
OAGenInfo* are listed in Completing the Menu Bar.


 From part, feature             To part, feature

 ConQFac, #newEvent             ContractQ, #this

 ConQFac, #newEvent             ContractQ, #setFocus

 ConQFac, #newEvent             ContractQ, #showModally

 CtrQFac, #newEvent             ContractorQ, #this

 CtrQFac, #newEvent             ContractorQ, #setFocus

 CtrQFac, #newEvent             ContractorQ, #showModally

 SklQFac, #newEvent             SkillQ, #this

 SklQFac, #newEvent             SkillQ, #setFocus

 SklQFac, #newEvent             SkillQ, #showModally

Connections for modeless windows

Now make the following connections for the modeless information windows:


 From part, feature             To part, feature

 ConVFac, #newEvent             ContractV, #this

 ConVFac, #newEvent             ContractV, #setFocus

 ConVFac, #newEvent             ContractV, #visible

 CtrVFac, #newEvent             ContractorV, #this

 CtrVFac, #newEvent             ContractorV, #setFocus

 CtrVFac, #newEvent             ContractorV, #visible

 SklVFac, #newEvent             SkillV, #this

 SklVFac, #newEvent             SkillV, #setFocus

 SklVFac, #newEvent             SkillV, #visible


ΓòÉΓòÉΓòÉ 49.4. Make the final connections ΓòÉΓòÉΓòÉ

With all parts represented in the primary part, you have only to make the final
connections. This includes the following:

     Connecting the nonvisual parts to their corresponding variable parts
     Completing the menu bar


ΓòÉΓòÉΓòÉ 49.4.1. Connect the nonvisual parts to the variables that represent them ΓòÉΓòÉΓòÉ

Each visual part contains promoted variables as placeholders for the static
nonvisual parts dropped in OAMain. Now, connect the static parts to the
variables that represent them as follows:


 From part, feature             To part, feature

 Contract, #this                ConQFac, #contract

 Contract, #this                ConVFac, #contract

 Contract, #this                CtrVFac, #contract

 Contractor, #this              CtrQFac, #contractor

 Contractor, #this              CtrVFac, #contractor

 Skill, #this                   SklQFac, #skill

 Skill, #this                   SklVFac*, #skill

 SkillBase, #this               SklQFac, #skillBase

 SkillBase, #this               SklVFac, #skillBase

 SkillBase, #this               CtrQFac, #skillBase

 SkillBase, #this               CtrVFac, #skillBase


ΓòÉΓòÉΓòÉ 49.4.2. Complete the menu bar ΓòÉΓòÉΓòÉ

Now that all parts appear on the free-form surface, you can complete the menu
bar. The connections echo those made in Connecting to the Object Factory Parts.

Connections from the View submenu


 From part, feature             To part, feature

 ContractMI, #commandEvent      ConQFac, #new

 ContractorMI, #commandEvent    CtrQFac, #new

 SkillMI, #commandEvent         SklQFac, #new

 GenInfoMI, #commandEvent       VBDevelopment, #setFocus

 GenInfoMI, #commandEvent       VBDevelopment, #showModally

Connections from the Edit submenu


 From part, feature             To part, feature

 ContractMI, #commandEvent      ConVFac, #new

 ContractorMI #commandEvent     CtrVFac, #new

Once all connections are complete, you are ready to generate code. Make sure to
save your work.


ΓòÉΓòÉΓòÉ 50. ...Generate source code for parts and applications ΓòÉΓòÉΓòÉ

     Preparing for source code generation:

        -  Setting up Visual Builder to generate make files

        -  Setting up Visual Builder projects to use WorkFrame's makemake
           program

     Generating C++ source code for individual parts

     Source files created during part code generation

     Generating C++ source code for your application's main() function

     Source files created during generation of main() function code

     Preparing generated files for compilation

        -  Specifying additional libraries in the make file

        -  Specifying debug options for the compiler and linker programs

     Compiling and linking your application


ΓòÉΓòÉΓòÉ 50.1. Prepare for source code generation ΓòÉΓòÉΓòÉ

Before getting started, decide how you want to build your application's make
file. You can create make files in either of the following ways:

     From Visual Builder
     Using WorkFrame's makemake program

 Both options require the following advance preparation.


ΓòÉΓòÉΓòÉ 50.1.1. Set up Visual Builder to generate make files ΓòÉΓòÉΓòÉ

If you want Visual Builder to generate make files with the C++ source code,
follow these steps from the Visual Builder window:

   1. From the menu bar, select Options.

   2. Select Preferences; then select Generate make files.

 The next step is generating C++ source code for individual parts.


ΓòÉΓòÉΓòÉ 50.1.2. Set up Visual Builder projects to use WorkFrame's makemake program ΓòÉΓòÉΓòÉ

If you prefer to build your application's make file using WorkFrame, make sure
your Visual Builder project has the correct compile and link options set.
Follow these steps from the desktop:

   1. Open the Settings notebook for your Visual Builder project.

   2. Select the Target notebook tab. Type an appropriate name in the Make file
      name field.

   3. Select the Actions notebook tab.

   4. Select the link action; then select the Options push button.

   5. Select the Templates notebook tab.

   6. Select the Templates used radio button; then select the compile action to
      associate with the link action.

   7. Select the OK push button.

   8. Select the File Names notebook tab.

   9. Under Libraries to use, type in:

            cppoov3i.lib os2386.lib

  10. Under Definition (.DEF) file name, type the appropriate module definition
      file name.

  11. Select the OK push button.

  12. Close the Settings notebook.

 The next step is generating C++ source code for individual parts.


ΓòÉΓòÉΓòÉ 50.2. Generate C++ source code for individual parts ΓòÉΓòÉΓòÉ

After you finish constructing a part, you must generate source code. If the
part is an application in itself or if you want to test a part individually,
you must also generate the code as described in Generating C++ Source Code for
Your Application's main() Function.

You can generate source code for the part being edited from any of the Visual
Builder editors.

   1. From the editor's menu bar, select File.

   2. Select Save and generate; then select Part source.

 In addition, if you are using the Composition Editor, you can select , the
 icon for the Generate Part Code tool, on the tool bar. There is no difference
 between selecting this icon and using the menu item described previously.

           One of the most common causes of code generation errors is changing
           the names of features that are connected to other features. For
           example, suppose feature A is connected to feature B. If you change
           the name of feature A and then regenerate the source code for your
           part, Visual Builder displays an error. This can also occur if you
           change the name of a promoted feature. To correct the error,
           double-click on the connection arrow and replace the incorrect
           feature name with the correct one.

 For more information about the files generated, see Source Files Created
 during Part Code Generation.

 The next step is generating C++ source code for your application's main()
 function.


ΓòÉΓòÉΓòÉ 50.2.1. Know which source files are created during part code generation ΓòÉΓòÉΓòÉ

For each part processed, Visual Builder generates several source code files. As
an example, the following files are created for the OAContractView part:

 contractg.cpp A C++ code file.
 contractg.hpp The header file for contractg.cpp.
 contractg.h A resource header file for the .cpp file. This file contains the
           resource IDs for your part.
 contractg.rc A resource file that contains any text strings used in the part
           for entry field labels, push buttons, menus, and so forth.

 If you selected Default to FAT file names under the Options pull-down menu of
 the Visual Builder window and your part name has more than eight characters,
 Visual Builder creates an eight-character name for the part when it is
 created.

 Note:  If you are using the File Allocation Table (FAT) file system, we
        recommend that you always use part names and file names that have eight
        characters or less, even if you have selected the Default to FAT file
        names option. Otherwise, Visual Builder might use a file name for a
        .vbb file that is the same as one that already exists and write over
        the existing file.

 For information about how the .h and .rc files are used for translation, see
 Enabling National Language Support for an Application.

 The next step is generating C++ source code for your application's main()
 function.


ΓòÉΓòÉΓòÉ 50.3. Generate C++ source code for my application's main() function ΓòÉΓòÉΓòÉ

To create an executable application, you must generate code for the standard
C++ main() function. You can do this for parts that you want to test
individually or for your entire application. If you want to compile your entire
application, generate the function using the part that represents your
application's primary view.

You must first generate the C++ code for all parts that you intend to compile
in your application. Load into Visual Builder the .vbb files that represent all
parts that will appear in the compiled application. Then, generate the main()
function from the part that you want to appear first when your application is
started (the main part).

You can generate application source code for the main() function if the main
part is displayed in any of the Visual Builder editors.

   1. From the editor's menu bar, select File.

   2. Select Save and generate; then select main() for part.

 For more information about the files generated, see Source Files Created
 during Generation of main() Function Code.

 The next step is preparing generated files for compilation.


ΓòÉΓòÉΓòÉ 50.3.1. Know which source files are created during generation of main() ΓòÉΓòÉΓòÉ

function code

For each main part processed, Visual Builder creates several files. For the
OAMain part, the following files are created:

 oamain.app The C++ code file containing the main() function declaration.

           Note:  If you start Visual Builder from a WorkFrame project, a file
                  named vbmain.cpp is generated instead of a file named
                  oamain.app.

 oamain.mak A make file, if you opted to generate make files using Visual
           Builder.

 If you selected Default to FAT file names as a preference under the Options
 pull-down menu of the Visual Builder window and your part name has more than
 eight characters, Visual Builder creates an eight-character name for the
 generated files.

 Note:  If you are using the File Allocation Table (FAT) file system, we
        recommend that you always use part names and file names that have eight
        characters or less, even if you have selected the Default to FAT file
        names option. Otherwise, Visual Builder might use a file name for a
        .vbb file that is the same as one that already exists and write over
        the existing file.

 The next step is preparing generated files for compilation.


ΓòÉΓòÉΓòÉ 50.4. Prepare generated files for compilation ΓòÉΓòÉΓòÉ

Before compiling your application, be sure you have the following files:

     Header files for all parts
     .cpp files for all parts
     A make file
     An .app file for the main part

      Note:  If you start Visual Builder from a WorkFrame project, you should
             have a file named vbmain.cpp instead of an .app file.

 Final preparations for compilation and linking include the following:

     Specifying additional libraries (C++ libraries and DLLs) in the make file
     Specifying debug options for the compiler and linker programs


ΓòÉΓòÉΓòÉ 50.4.1. Specify additional libraries in the make file ΓòÉΓòÉΓòÉ

Review the list of libraries specified in the make file, particularly libraries
for parts that you compiled separately.

If your application uses DLLs, add the DLL names as dependent files in the
description blocks used to keep the object files up to date. The order in which
you list object files is significant. Files with external references must occur
after the referred-to files.


ΓòÉΓòÉΓòÉ 50.4.2. Specify the option to generate Browser information ΓòÉΓòÉΓòÉ

If your want the VisualAge C++ compiler to generate Browser information, you
must include the -Fb+ option when you compile your application. This option
causes the compiler to generate a file with an extension of .pdb. Once this
file is generated, you can use the Browser data when connecting features to
member functions and for other purposes. For more information, see Using
Browser Information.


ΓòÉΓòÉΓòÉ 50.4.3. Specify debug options for the compiler and linker programs ΓòÉΓòÉΓòÉ

If you prefer to compile and link your application using WorkFrame, you should
have already specified debug options in your Visual Builder project file. For
more information about the options you need to set, see the WorkFrame
documentation.

If you opted to let Visual Builder generate your make file, Visual Builder adds
debug options to the make file by default. If you do not want your application
compiled with debugging turned on, remove the /Ti+ option.

For more information, refer to the VisualAge C++ Language Reference.

To make Visual Builder connections easier to debug, set up a trace by following
these steps:

   1. In your config.sys file, add this line:

            SET ICLUI TRACETO=STDOUT

   2. In your make file, add this phrase at the end of the GCPPFLAGS statement,
      but before the back slash (\):

            -DIC_TRACE_DEVELOP

   3. When you run your compiled application, redirect the output to a file.
      For example, run myapp.exe as follows:

            myapp > myapp.out

      Browse the output file (myapp.out) to see what connections were fired and
      in what order.


ΓòÉΓòÉΓòÉ 50.5. Compile and link my application ΓòÉΓòÉΓòÉ

You can compile your application from the OS/2 command line or from WorkFrame.
To call both the complier and linker programs, you can run the Toolkit's nmake
program. Regardless of how you choose to compile and link your Visual Builder
application, use the following compile and link options:

 B"/DE /pmtype:pm" Passes the string /DE /pmtype:pm to the linker as
                parameters.

 C              Compiles and links.

 Fb+            Generates Browser information in a file with a .pdb extension.

 Ft(dir)        Generates files for template resolution and puts them in the
                dir directory.

 Gd+            Dynamically links to the runtime library.

 Gm+            Builds an .exe file.

 I              Searches the directory of the source file for include files;
                then, searches paths specified in config.sys include variable.

 Q              Displays the compiler logo when invoking the compiler.

 Ti+            Generates debugger information. This is optional but
                recommended.

 Tdp            Compiles all source files as C++ files and ensures that
                template functions are resolved.

 For more information on compiling and linking, refer to the VisualAge C++
 Programming Guide.


ΓòÉΓòÉΓòÉ 51. ...Use existing C and C++ code with Visual Builder ΓòÉΓòÉΓòÉ

     Defining the part interface using part information files

     Creating a part information file

     Importing the part


ΓòÉΓòÉΓòÉ 51.1. Define the part interface using part information files ΓòÉΓòÉΓòÉ

If C++ code already exists for your Visual Builder application, you can more
efficiently define the part interface using part information files. This
involves the following steps:

   1. Determine the part's features.

   2. Create a part information file using your favorite editor. This file can
      include information for as many parts as you need.

   3. In Visual Builder, import the part.


ΓòÉΓòÉΓòÉ 51.1.1. Create a part information file ΓòÉΓòÉΓòÉ

To create a part information file, add information about your part's part
interface to a file using your preferred editor. The following example shows
how you could specify part information for the OAContractor part:

//VBBeginPartInfo: OAContractor,"Contractor part for OASearch sample"
//VBParent: IStandardNotifier
//VBIncludes: "Cntrctor.hpp" _OACONTRACTOR_,"iprofile.hpp","istring.hpp","iexcbase.hpp"
//VBPartDataFile: OANONVIS.VBB
//VBConstructor: OAContractor()
//VBComposerInfo: nonvisual,802,cppov33r
//VBEvent: ready, "ready", readyId
//VBAction: getContractor,
//VB:       "Get contractor data from database",
//VB:       OAContractor&,
//VB:       OAContractor& getContractor()
//VBAction: putContractor,
//VB:       "Add or update contractor data in database",
//VB:       OAContractor&,
//VB:       OAContractor& putContractor()
//VBAction: parseName,
//VB:       "Parse user input to get contractor's name",
//VB:       OAContractor&,
//VB        OAContractor& parseName(const IString& aName)
//VBAttribute: contractorID,
//VB:          "Contractor's employee identifier",
//VB:          IString,
//VB:          IString contractorID() const,,
//VB:          contractorIDId
//VBAttribute: lastName,
//VB:          "Contractor's last name",
//VB:          IString,
//VB:          IString lastName() const,
//VB:          OAContractor& setLastName(const IString& aLastName),
//VB:          lastNameId
//VBAttribute: firstName,
//VB:          "Contractor's first name",
//VB:          IString,
//VB:          IString firstName() const,
//VB:          OAContractor& setFirstName(const IString& aFirstName),
//VB:          firstNameId
//VBAttribute: middleInitial,
//VB:          "Contractor's middle initial",
//VB:          IString,
//VB:          IString middleInitial() const,
//VB:          OAContractor& setMiddleInitial(const IString& aMiddleInitial),
//VB:          middleInitialId
//VBAttribute: homeStreet,
//VB:          "Contractor's home street address",
//VB:          IString,
//VB:          IString homeStreet() const,
//VB:          OAContractor& setHomeStreet(const IString& aHomeStreet),
//VB:          homeStreetId
//VBAttribute: homeCity,
//VB:          "Contractor's home city",
//VB:          IString,
//VB:          IString homeCity() const,
//VB:          OAContractor& setHomeCity(const IString& aHomeCity),
//VB:          homeCityId
//VBAttribute: homeState,
//VB:          "Contractor's home state or province",
//VB:          IString,
//VB:          IString homeState() const,
//VB:          OAContractor& setHomeState(const IString& aHomeState),
//VB:          homeStateId
//VBAttribute: homeZip,
//VB:          "Contractor's home postal code",
//VB:          IString,
//VB:          IString homeZip() const,
//VB:          OAContractor& setHomeZip(const IString& aHomeZip),
//VB:          homeZipId
//VBAttribute: phoneNumber,
//VB:          "Contractor's daytime phone number",
//VB:          IString,
//VB:          IString phoneNumber() const,
//VB:          OAContractor& setPhoneNumber(const IString& aPhoneNumber),
//VB:          phoneNumberId
//VBAttribute: startDate,
//VB:          "Contractor's starting date with OA",
//VB:          IString,
//VB:          IString startDate() const,
//VB:          OAContractor& setStartDate(const IString& aStartDate),
//VB:          startDateId
//VBAttribute: endDate,
//VB:          "Contractor's last day with OA (empty if active)",
//VB:          IString,
//VB:          IString endDate() const,
//VB:          OAContractor& setEndDate(const IString& aEndDate),
//VB:          endDateId
//VBAttribute: activeStatus,
//VB:          "Whether contractor actively seeks contract work",
//VB:          Boolean,
//VB:          Boolean isActiveStatus() const,
//VB:          OAContractor& enableActiveStatus(Boolean enable = true),
//VB:          activeStatusId
//VBAttribute: currentContract,
//VB:          "Contractor's current assignment, if any",
//VB:          IString,
//VB:          IString currentContract() const,
//VB:          OAContractor& setCurrentContract(const IString& aCurrentContract),
//VB:          currentContractId
//VBPreferredFeatures: enabledForNotification, getContractor, putContractor, this
//VBEndPartInfo: OAContractor

Note the following syntax:

     The VBBeginPartInfo and VBEndPartInfo statements delimit the part
      information for OAContractor.

     The VBPart statement specifies the base class for OAContractor,
      IStandardNotifier*.

     The VBIncludes statement specifies a header file to be added in an
      #include directive when the code is generated.

     The VBPartDataFile statement specifies the .vbb file that holds the
      information for OAContractor.

     The VBComposerInfo statement indicates that this is a nonvisual part. The
      absence of the abstract keyword indicates that this is a concrete part
      that can be dropped on the free-form surface.

     The VBEvent, VBAction, and VBAttribute statements define features for
      this part.

 For information about part definition syntax, refer to Building VisualAge C++
 Parts for Fun and Profit.

 The next step is importing the part.


ΓòÉΓòÉΓòÉ 51.1.2. Import the part ΓòÉΓòÉΓòÉ

Before importing the part, you must create a part information file. To import
the part, follow these steps from the Visual Builder window:

   1. From the menu bar, select File. Select Import part information.

      The Enter Name for Part Information File window appears.

   2. Specify the path and name of the part information file that contains the
      information that you want to import. When the import is finished, the
      name of the part appears in in the Visual Builder window.

 If C++ code for your part already exists, your part is finished. If you want
 to change the part interface later, do either of the following:

     Use the Part Interface Editor to edit feature specifications. You must
      use this method to delete features.
     Edit your part information file and re-import the part information.

 If C++ code for your part does not exist, the next step is adding code to your
 part.


ΓòÉΓòÉΓòÉ 52. ...Add categories and parts to the parts palette ΓòÉΓòÉΓòÉ

     Preparing icons for the parts palette

     Adding a category to the parts palette

     Specifying a unique icon for a part you add to the parts palette

     Adding a part to the parts palette

     Deleting a category or part from the parts palette

     Saving parts palette changes


ΓòÉΓòÉΓòÉ 52.1. Prepare icons for the parts palette ΓòÉΓòÉΓòÉ

This example uses for the OAModels category and for the OAContractor part,
which are stored in the cppov33r.dll file as resource numbers 800 and 802,
respectively.

To prepare icons for use with Visual Builder, do the following:

   1. Create your icons. One way to do this is to use your operating system
      toolkit icon editor.

      For VGA displays on OS/2, use the Independent VGA form (32x32). For
      higher display resolutions on OS/2, use the 8514-16 colors form (40x40).

   2. Create a resource DLL that contains your icons. Use files similar to the
      following:

          userpal.c

                        empty()
                        {
                        }

          userpal.rc

                        icon 800 oamodels.ico
                        icon 801 oacontractor.ico

          userpal.def

                        library userpal
                        description 'Icons for user-extended palette'

          userpal.mak

                        userpal.dll: userpal.obj userpal.def userpal.res
                          icc userpal.obj /Feuserpal.dll userpal.def
                            rc userpal.res userpal.dll

                        userpal.obj: userpal.c
                          icc /C+ userpal.c

                        userpal.res: userpal.rc
                          rc -r userpal.rc

      Once you have the files ready, type the following to build the resource
      DLL: nmake userpal.mak

   3. Place the resource DLL in a directory in your LIBPATH.

 Your icons are now ready for use with Visual Builder.

 The next step is adding a category to the parts palette.


ΓòÉΓòÉΓòÉ 52.2. Add a category to the parts palette ΓòÉΓòÉΓòÉ

Now that you have your icons prepared in a resource DLL, you are ready to
extend the parts palette. To add a category to the parts palette, do the
following:

   1. In the Composition Editor, select Modify PaletteAdd New Category from
      the Options pull-down menu.

      The Add palette category window is displayed as follows:

      Notice that the default category icon, , is specified. It is stored as
      resource ID 150 in the dde4vr30.dll resource file provided with Visual
      Builder.

   2. Type OAModels or the name that you want for your category in the Category
      name field.

   3. Type cppov33r or the name of your resource DLL in the Module name field.

      Note:  Do not type the .dll file extension in the Module name field.

   4. Type 800 or the resource ID of the icon in your resource DLL in the ID
      field.

      Note:  After you enter the resource ID number, move the cursor to another
             component in the window, such as the Module name field, if you
             want to see the graphic that will be used before continuing.

   5. Select the OK push button.

 Your category with the icon specified is added to the parts palette.

 The next step is specifying a unique icon for your part.


ΓòÉΓòÉΓòÉ 52.3. Specify a unique icon for a part I add to the parts palette ΓòÉΓòÉΓòÉ

You can specify a unique icon for a part that you add to the parts palette, but
you must do so before you add it to the parts palette. To give your part a
unique icon, do the following:

   1. Open the part.

   2. Switch to the Class Editor.

   3. Enter the name of the DLL file that contains the icon you want to use in
      the DLL Name field.

   4. Enter the resource ID number for the icon in the Resource Id field.

      If you enter a valid DLL file name and resource ID number, Visual Builder
      displays the icon below the Resource Id field. This allows you to verify
      the icon before adding it to the parts palette.

   5. Select FileSave to save the resource DLL and resource ID information in
      the Class Editor.

 The next step is adding a part to the parts palette.


ΓòÉΓòÉΓòÉ 52.4. Add a part to the parts palette ΓòÉΓòÉΓòÉ

You can add a part to any category on the parts palette using any of the
following methods:

     Adding a part that is selected in the Visual Builder window

     Adding the part that you are currently editing

     Adding any part whose .vbb file is loaded


ΓòÉΓòÉΓòÉ 52.4.1. Add a part that is selected in the Visual Builder window ΓòÉΓòÉΓòÉ

To add a part to the parts palette from the Visual Builder window, do the
following:

   1. Load the .vbb file that contains the part you want to add to the parts
      palette if it is not already loaded.

   2. Select the .vbb file. For this example, select oanonvis.vbb.

   3. Select the part you want to add. For this example, select OAContractor.

      Note:  You can add multiple parts by holding down the Ctrl key and
             clicking on each part that you want to add.

   4. Select PartAdd to palette.

      Visual Builder displays the Add to Palette window, as shown in the
      following figure:

   5. Select the part that you want to add. For this example, select
      OAContractor.

   6. Select the category that you want to add the part to. For this example,
      select OAModels.

   7. Select the Add push button.

      Visual Builder adds the OAContractor part to the parts palette in the
      OAModels category.


ΓòÉΓòÉΓòÉ 52.4.2. Add the part that I am currently editing ΓòÉΓòÉΓòÉ

You can add the part that you are currently editing to the parts palette from
either the Composition Editor, the Class Editor, or the Part Interface Editor.
To add the part that you are currently editing to the parts palette, do the
following:

   1. Double-click on the OAContractor part in the Visual Builder window.

      Visual Builder opens the OAContractor part in the Part Interface Editor.

   2. Select FileAdd to palette.

      Visual Builder displays the Add to Palette window, as shown in the
      following figure:

      The Part name field shows the name of the part that you are editing. This
      is the part that is to be added to the parts palette. You cannot change
      the name of the part displayed in this field. In this example,
      OAContractor is displayed in this field.

   3. Select the category that you want to add the part to. For this example,
      select OAModels.

   4. Select the Add push button.

      The OAContractor part is added to the OAModels category on the parts
      palette. To see this, switch to the Composition Editor and select the
      OAModels category. The icon for the OAContractor part is displayed in the
      parts column.


ΓòÉΓòÉΓòÉ 52.4.3. Add any part whose .vbb file is loaded ΓòÉΓòÉΓòÉ

You can add any part to the parts palette as long as its .vbb file is loaded in
the Visual Builder window. The following steps explain how to do this:

   1. In the Composition Editor, select Modify PaletteAdd New Part from the
      Options pull-down menu. The Add to Palette window is displayed as
      follows:

      To add a part to the parts palette, do the following:

        a. Type OAContractor in the Part name field or the class name of the
           part you want to add.

        b. Select OAModels in the Category list or the name of the category to
           which you want to add your part.

        c. Select the Add push button.

           Your part is added to the parts palette in the specified category.

 Notice that the part you just added uses the same icon as the part it inherits
 from. If you inherit from a part whose icon does not appear on the parts
 palette, such as IStandardNotifier*, or for which you have not provided a
 resource DLL, Visual Builder uses the default part icon, .

 The next section tells you how to delete a category or part from the parts
 palette


ΓòÉΓòÉΓòÉ 52.5. Delete a category or part from the parts palette ΓòÉΓòÉΓòÉ

To delete a part from the parts palette, do the following:

   1. Select the part on the parts palette.

   2. Select Modify PaletteDelete Part from the Options pull-down menu.

      The selected part is deleted from the parts palette.

 To delete a category from the parts palette, do the following:

   1. Select the category on the parts palette.

   2. Select Modify PaletteDelete Category from the Options pull-down menu.

      The selected category and all of the parts in it are deleted from the
      parts palette.


ΓòÉΓòÉΓòÉ 52.6. Save parts palette changes ΓòÉΓòÉΓòÉ

Visual Builder automatically saves all parts palette changes for you. When you
create a new category or part, Visual Builder stores information about that
category or part in a file named vbpalet.dat, which is stored in your current
directory. This file is written automatically.

Removing a category or part that you just added

The vbpalet.dat file also allows you to undo and redo any changes you make to
the parts palette, but only during the current Composition Editor session. For
example, after adding a category or part, you can select EditUndo to remove
the part or category you just added. Selecting EditRedo would put the part or
category back on the parts palette, again.

Once you close the Composition Editor, you can no longer undo or redo any
changes. However, you can still add categories and add parts, as well as delete
categories and parts.


ΓòÉΓòÉΓòÉ 53. ...Enable national language support for an application ΓòÉΓòÉΓòÉ

     Using resource files for translation

     Using canvases to adjust size for translated text

     Specifying parts with country-sensitive formatting

     Providing double-byte character support for Asian languages


ΓòÉΓòÉΓòÉ 53.1. Use resource files for translation ΓòÉΓòÉΓòÉ

In Generating Source Code for Parts and Applications, you learned that Visual
Builder generates the following resource files for you:

     A resource file (partname.rc), which contains the text strings used in
      your part

     A resource header file (partname.h), which contains the resource IDs for
      your application

 The resource (partname.rc) file

 The .rc file groups resources into two categories:window resources and
 nonwindow resources. The window resources are the text strings that are
 associated with window IDs for information area text and fly-over text.

 The nonwindow resources are the text strings that are displayed in your
 composite part. Examples are window titles, static text used to label entry
 fields and list boxes, and the text on push buttons and menu items. These text
 strings are delimited by quotation marks (") and can be translated into
 another language.

 Here is the todolist.rc file that we generated for the To-Do List application
 shown in Creating a Simple Visual Builder Application:

  //*************************************************************
  // Resource file for: ToDoList.cpp
  //*************************************************************
  #include "ToDoList.h"

  #include <os2.h>

  #ifndef MAIN_RESOURCES_INCLUDED
  #define MAIN_RESOURCES_INCLUDED

  HELPTABLE WND_ToDoList
     BEGIN
        HELPITEM  WND_ToDoList_FrameWindow,  WND_ToDoList_FrameWindow,  0
     END

  #define ToDoList_WINDOWRESOURCES
  #define ToDoList_NONWINDOWRESOURCES
  STRINGTABLE
     BEGIN
        1,  "Visual Builder 3.0"
     END

  #endif

  #ifdef ToDoList_NONWINDOWRESOURCES
  #ifndef ToDoList_NONWINDOWRESOURCES_INCLUDED
  #define ToDoList_NONWINDOWRESOURCES_INCLUDED
  STRINGTABLE
     BEGIN
        STRRC_ToDoList_FrameWindow_title,  "To-Do List"
        STRRC_ToDoList_StaticText1_text,  "To-do item"
        STRRC_ToDoList_EntryField1_text,  ""
        STRRC_ToDoList_StaticText2_text,  "To-do list"
        STRRC_ToDoList_PushButton1_text,  "Add"
        STRRC_ToDoList_PushButton2_text,  "Remove"
     END

  #endif
  #endif

  #ifdef ToDoList_WINDOWRESOURCES
  HELPSUBTABLE (WND_ToDoList_FrameWindow)
     BEGIN
     END

  #endif

  #ifdef ToDoList_HELPITEMRESOURCES
        HELPITEM  WND_ToDoList_FrameWindow,  WND_ToDoList_FrameWindow,  0
  #endif

  #ifdef ToDoList_HELPSUBITEMRESOURCES
  #endif

 The window resources and nonwindow resources are grouped into separate string
 tables so that translators can easily find the text that is to be translated.

 You may have text strings in your part, such as the application name, that you
 do not want translated. If that is the case, you can prevent those text
 strings from being inserted in the .rc file by inserting a number sign (#) at
 the beginning of the text and enclosing the text in quotation marks ("). This
 change must be made in the settings notebook for the part, not in the
 Composition Editor.

 For example, suppose you do not want the text in the window title, To-Do List,
 to be translated. To prevent Visual Builder from inserting this text string in
 the .rc file, you would open the settings notebook for the ToDoList part, find
 the entry field on the General page that contains the title text, and change
 it to the following:

  #"To-Do List"

 Notice that each text string that Visual Builder inserts in the .rc file is
 preceded by a #define statement that begins with STRRC. These #define
 statements represent the resource ID of each text string. Visual Builder
 generates these #define statements and defines them in the partname.h file. By
 inserting and defining these #define statements, Visual Builder relieves you
 from the task of having to specify resource IDs for each text string.

 To help Visual Builder generate these #define statements properly, you must
 enter the starting resource ID for your part. The following section explains
 how to do this.

 The resource header (partname.h) file

 The .h file contains a list of #define statements. Visual Builder uses these
 #define statements in the .rc file to assign unique resource IDs to each of
 the text strings that you use to create your composite part and a unique
 window ID to all primitive visual parts. The only resource ID that you need to
 specify is the starting resource ID for the part.

 Here is the todolist.h file that we generated for the To-Do List application
 shown in Creating a Simple Visual Builder Application:

  //*************************************************************
  // Resource header file for: ToDoList.cpp
  //*************************************************************
  #ifndef _ICCONST_
  #include <icconst.h>
  #endif

  #ifndef _IVBDEFS_
  #include <ivbdefs.h>
  #endif

  #ifndef RC_ToDoList
  #define RC_ToDoList  10000
  #endif

  #ifndef WND_ToDoList
  #define WND_ToDoList  VBBASEWINDOWID
  #endif

  #define WNDOFFSET_ToDoList_FrameWindow  0
  #define WND_ToDoList_FrameWindow  WND_ToDoList
  #define STRRC_ToDoList_FrameWindow_title  RC_ToDoList+0

  #define WNDOFFSET_ToDoList_Canvas  1
  #define WND_ToDoList_Canvas  WND_ToDoList + WNDOFFSET_ToDoList_Canvas

  #define WNDOFFSET_ToDoList_StaticText1  2
  #define WND_ToDoList_StaticText1  WND_ToDoList + WNDOFFSET_ToDoList_StaticText1
  #define STRRC_ToDoList_StaticText1_text  RC_ToDoList+1

  #define WNDOFFSET_ToDoList_EntryField1  3
  #define WND_ToDoList_EntryField1  WND_ToDoList + WNDOFFSET_ToDoList_EntryField1
  #define STRRC_ToDoList_EntryField1_text  RC_ToDoList+2

  #define WNDOFFSET_ToDoList_StaticText2  4
  #define WND_ToDoList_StaticText2  WND_ToDoList + WNDOFFSET_ToDoList_StaticText2
  #define STRRC_ToDoList_StaticText2_text  RC_ToDoList+3

  #define WNDOFFSET_ToDoList_PushButton1  5
  #define WND_ToDoList_PushButton1  WND_ToDoList + WNDOFFSET_ToDoList_PushButton1
  #define STRRC_ToDoList_PushButton1_text  RC_ToDoList+4

  #define WNDOFFSET_ToDoList_PushButton2  6
  #define WND_ToDoList_PushButton2  WND_ToDoList + WNDOFFSET_ToDoList_PushButton2
  #define STRRC_ToDoList_PushButton2_text  RC_ToDoList+5

  #define WNDOFFSET_ToDoList_ListBox1  7
  #define WND_ToDoList_ListBox1  WND_ToDoList + WNDOFFSET_ToDoList_ListBox1


 Find the first #define statement in the todolist.h file. It is the RC_ToDoList
 #define statement. The number to the right of this #define statement, 10000,
 is the starting resource ID. This is the default number that Visual Builder
 inserts when you select the check box next to the Starting resource id field
 in the Class Editor. Visual Builder uses this number as the resource ID of the
 first text string and increments the resource ID of each successive text
 string by 1.

 We chose to use the default number 10000 for the following reasons:

     The resource ID must be a number.

     The number specified must be either high enough or low enough that it
      does not conflict with the resource IDs that Visual Builder generates for
      the primitive parts (entry field, push buttons, and so forth) that are
      used to compose the ToDoList part.

 When determining resource IDs for window resources, Visual Builder begins with
 15000 and increments the resource ID of each successive primitive part by 5.
 Therefore, we recommend using starting resource IDs between 100 and 14500 for
 most applications for the following reasons:

     You should not use resource IDs below 100 because Presentation Manager
      has reserved many of them for its own use.

     Numbers between 100 and 14500 are low enough to prevent you from
      experiencing any resource ID conflicts in most cases.

 Specifying the starting resource ID for subparts

 If you use a part that you have created as a subpart, specify a starting
 resource ID for both the subpart and the part in which the subpart is
 embedded. Do this to prevent conflicts between the resource IDs that Visual
 Builder generates for your subpart and those it generates for the part in
 which the subpart is embedded, as described in the preceding section.
 Otherwise, Visual Builder uses the same starting resource IDs for both the
 subpart and the part in which it is embedded, which causes compile errors.

 For example, suppose you have a reusable Address part (a canvas with entry
 fields and static text) that you want to embed as a subpart in the frame
 window of your application's main view. You might give the main view a
 starting resource ID of 5000 and the Address part a starting resource ID of
 6000. Doing this would prevent conflicts with the resource IDs that Visual
 Builder generates for the main view and those it generates for the Address
 part.


ΓòÉΓòÉΓòÉ 53.2. Use canvases to adjust size for translated text ΓòÉΓòÉΓòÉ

When text is translated from one language to another, the translated text often
occupies more space than the original text occupied. This can cause problems
because the layout of the user interface can be disrupted by the longer text
strings.

Two of the canvas parts that Visual Builder provides solve this problem for
you:  ISetCanvas* and IMultiCellCanvas*. These parts allow you to insert
translated text and rebuild your application without having to change the
position of any of the parts in the user interface. The ISetCanvas* and
IMultiCellCanvas* parts automatically adjust their size at run time to allow
for longer text strings, taking into account the current window's text size and
font.

For example, suppose you are using an ISetCanvas* part with three vertical
decks and three rows of IRadioButton* parts in each deck. Once the text strings
for the IRadioButton* parts are translated, all you have to do is rebuild your
application. The decks in the ISetCanvas* part automatically adjust their
widths to allow for the size of the translated text strings.

The IMultiCellCanvas part is also good for translation purposes because the
rows and columns automatically adjust themselves to fit the translated text.


ΓòÉΓòÉΓòÉ 53.3. Specify parts with country-sensitive formatting ΓòÉΓòÉΓòÉ

Visual Builder provides the following class interface parts that allow you to
specify how information is presented for specific national languages:

 IDate      This part allows you to customize the date formatting for the
            selected part. This includes specifying the order for the month,
            day, and year, and the character to use as a separator.

 ITime      This part allows you to customize the time formatting for the
            selected part. This includes specifying the 12- or 24-hour format
            and the character to use as a separator.


ΓòÉΓòÉΓòÉ 53.4. Provide double-byte character support for Asian languages ΓòÉΓòÉΓòÉ

The following Visual Builder parts provide DBCS support:

 IBuffer
   Class interface part that defines the contents of an IString. This part
   provides attributes to determine whether part or all of the characters in a
   buffer are DBCS or multi-byte character set (MBCS) characters, and whether
   they are valid DBCS or MBCS characters.

 IDBCSBuffer
   Class interface part that implements the version of IString contents that
   supports mixed OS/2 DBCS characters. This part ensures that MBCS characters
   are processed properly.

 IEntryField
   Visual part that creates and manages an entry field control. On the General
   page of the settings notebook for this part, you can specify the type of
   data that the user can enter. It can be one of the following:

   SBCS           Sets the entry field to accept SBCS text only.

   DBCS           Sets the entry field to accept DBCS text only.

   Mixed          Sets the entry field to accept text that is a mixture of SBCS
                  and DBCS characters. Conversion from an ASCII DBCS code page
                  to an EBCDIC DBCS code page can result in a possible increase
                  in the length of the data because of the addition of shift-in
                  and shift-out characters, but it does not exceed the text
                  limit of the entry field.

   Any            Sets the entry field to accept text that is a mixture of SBCS
                  and DBCS characters. This setting is the opposite of mixed.
                  If the text contains both SBCS and DBCS characters and is to
                  be converted from an ASCII code page into an EBCDIC code
                  page, this style causes an entry field to not account for
                  shift-in and shift-out characters that would be introduced
                  into its text.

 IFrameWindow
   Visual part that creates and manages a frame window control. This part has a
   style option, appDBCSStatus, that includes a DBCS status area in the frame
   window when it is displayed in a DBCS environment. IFrameWindow also has a
   member function, shareParentDBCSStatus, that causes a child frame window to
   share the DBCS status area of its parent.

 IKeyboardEvent
   Class interface part that represents a keyboard-related event. An
   IKeyboardEvent object is created by a keyboard handler when a user presses
   or releases a key. The part provides a virtualKey attribute that returns the
   virtual key code of the key. Two of the codes it can return are firstDBCS
   and lastDBCS.

 IString
   Class interface part that is an array of characters. This part provides
   attributes to determine whether part or all of the characters in a string
   are DBCS or MBCS characters, and whether they are valid DBCS or MBCS
   characters.


ΓòÉΓòÉΓòÉ 54. ...Use Direct-to-SOM objects in Visual Builder applications ΓòÉΓòÉΓòÉ

     Creating and importing the part information file

     Using DTS objects in a Visual Builder application

     Bypassing DTS limitations


ΓòÉΓòÉΓòÉ 54.1. Create and import the part information file ΓòÉΓòÉΓòÉ

In Defining the Part Interface Using Part Information Files, you learned how to
create a part information file. Create a file like this for your DTS objects.
There are only two requirements when creating this file:

     DTS objects can only have actions. This makes DTS objects the equivalent
      of class interface parts because they have no notification capability.
      Therefore, you must set the VBComposerInfo statement for each DTS object
      to class.

     Since DTS objects can only have actions, you cannot code any attributes
      or events in your part information file.

 The following example shows a part information file, mydtsdt.vbe, that
 contains the information for the following sample DTS objects:

 MyDTSDate      Returns the current date.

 MyDTSTime      Returns the current time.

  //
  // SOM classes as Visual Builder classes
  //
  //VBBeginPartInfo: MyDTSDate, "My DTS SOM Date Class"
  //VBIncludes: "mydtsdat.hh" MyDTSDate_hh
  //VBPartDataFile: 'mydtsdt.vbb'
  //VBLibFile: 'mydtsdat.lib'
  //VBComposerInfo: class
  //VBAction: getTodaysDate
  //VB:       ,"Get today's date action.",char*,
  //VB:       char* getTodaysDate()
  //VBPreferredFeatures: this, getTodaysDate
  //VBEndPartInfo: MyDTSDate
  //
  //VBBeginPartInfo: MyDTSTime, "My DTS SOM Time Class"
  //VBIncludes: "mydtstim.hh" MyDTSTime_hh
  //VBPartDataFile: 'mydtsdt.vbb'
  //VBLibFile: 'mydtstim.lib'
  //VBComposerInfo: class
  //VBAction: getCurrentTime
  //VB:       ,"Get current time action.",char*,
  //VB:       char* getCurrentTime()
  //VBPreferredFeatures: this, getCurrentTime
  //VBEndPartInfo: MyDTSTime
  //

 The mydtsdt.vbe file contains statements that refer to the following files
 that are needed for each of the sample DTS objects:

 mydtsdat.hh and mydtstim.hh The header files for the MyDTSDate and MyDTSTime
                SOM classes.

 mydtsdat.lib and mydtstim.lib The library files that were created when the DTS
                objects were compiled.

 mydtsdt.vbb    The part (.vbb) file that is to contain the information about
                the DTS parts when you import the part information from the
                mydtsdt.vbe file. You must load the mydtsdt.vbb file into
                Visual Builder before you can add the MyDTSDate and MyDTSTime
                parts to the free-form surface in the Composition Editor.

 Once you create your part information file, you must import it into Visual
 Builder before you can use your DTS objects in a Visual Builder application.
 For information on how to do this, see Importing Part Information.

 The next step is using DTS objects in a Visual Builder application.


ΓòÉΓòÉΓòÉ 54.2. Use DTS objects in a Visual Builder application ΓòÉΓòÉΓòÉ

Using DTS objects in a Visual Builder application is no different from using a
class interface part. You simply place the DTS objects on the free-form surface
and make the necessary connections to use their actions.

The following figure shows how we used the MyDTSDate and MyDTSTime objects in a
simple application.

To create the application, we placed the MyDTSDate and MyDTSTime parts on the
free-form surface by selecting OptionsAdd part and providing the necessary
information in the Add Part window for each part.

In this application, when a user clicks on the Current push button, the
buttonClickEvent feature causes the getTodaysDate and getTodaysTime actions to
get the date and time that is currently set in your computer's operating
system. In addition, the actionResult attribute of each connection updates the
text attribute of each entry field with the result of the two actions, the
current date and time.

Earlier, we mentioned that actions in DTS classes can return only basic C data
types. The getTodaysDate and getTodaysTime actions in our example both return a
data type of char*. Therefore, when we connected the actionResult attribute to
the text attribute of the entry field, Visual Builder displayed a message
saying that the types did not match and asking if we wanted to continue. In
this case, we could make the connection because IString has a constructor that
takes a char*. You can find out whether to complete a connection in situations
like this by looking at the IBM Open Class Library Reference.

           When you have generated your code and are ready to compile your
           application, make sure you have the .hh and .lib files that contain
           the code for your DTS objects in the current directory. Also, make
           sure the SOM Toolkit is installed because the VisualAge C++ compiler
           must have access to several of its files.

           When you are ready to run your application, the .dll for the DTS
           objects must be accessible.


ΓòÉΓòÉΓòÉ 54.3. Bypass DTS limitations ΓòÉΓòÉΓòÉ

Earlier, we told you that DTS objects have certain limitations, such as not
being able to use attributes and events, and not being able to notify other
parts. You can bypass these limitations by using nonvisual parts to manage the
things your DTS objects cannot do.

In the example shown in Using DTS Objects in a Visual Builder Application, we
could have created two nonvisual parts called MyDate and MyTime in addition to
the two DTS parts, MyDTSDate and MyDTSTime. We could give these nonvisual parts
attributes such as theDate and theTime and notify other parts when the values
of these attributes change. We could also give these attributes get and set
member functions that call actions in the DTS objects to get and set the values
of the attributes.

Once this is done, we would place the nonvisual parts MyDate and MyTime on the
free-form surface, instead of MyDTSDate and MyDTSTime, and make the same
connections as described previously.


ΓòÉΓòÉΓòÉ 55. Glossary ΓòÉΓòÉΓòÉ


ΓòÉΓòÉΓòÉ <hidden> Glossary description ΓòÉΓòÉΓòÉ

This glossary defines terms and abbreviations that are used in this book. If
you do not find the term you are looking for, refer to the IBM Dictionary of
Computing, New York:McGraw-Hill, 1994.

This glossary includes terms and definitions from the American National
Standard Dictionary for Information Systems, ANSI X3.172-1990, copyright 1990
by the American National Standards Institute (ANSI). Copies may be purchased
from the American National Standards Institute, 1430 Broadway, New York, New
York 10018.


ΓòÉΓòÉΓòÉ <hidden> Glossary listing ΓòÉΓòÉΓòÉ

A
abstract class
access
action
argument
attribute
attribute-to-action connection
attribute-to-attribute connection
attribute-to-member function connection
B
base class
behavior
C
caller
category
class
Class Editor
class hierarchy
class library
class member function
client area object
client object
collection
Common User Access (CUA)
composite part
Composition Editor
concrete class
connection
const
construction from parts
constructor
CUA
cursored emphasis
custom logic connection
D
data abstraction
data member
data model
data object
declaration
DEF file
derivation
destructor
DLL
dynamic link library (DLL)
E
encapsulation
event
event-to-action connection
event-to-attribute connection
event-to-member function connection
expansion area
F
feature
full attribute
free-form surface
G
graphical user interface (GUI)
GUI
H
handles
header file
I
inheritance
instance
L
legacy code
loaded
M
main part
member
member function
member function call
member function name
message
model
module definition file
N
nested class
nonvisual part
no-event attribute
no-set attribute
notebook part
O
object
object class
object factory
object-oriented programming
observer
operation
overloading
P
palette
parameter connection
parent class
part
part event
part event ID
part interface
Part Interface Editor
parts palette
preferred features
primary selection
private
process
program
protected
prototype
primitive part
process
property
pure virtual function
R
receiver
resource file
S
selection handles
server
service
settings view
sticky
structure
subpart
superclass
T
tear-off attribute
template
thread
tool bar
U
UI
unloaded
user interface (UI)
V
variable
view
virtual function
visual part
visual programming tool
W
white space
window


ΓòÉΓòÉΓòÉ <hidden> abstract class ΓòÉΓòÉΓòÉ

A class that provides common behavior across a set of subclasses but is not
itself designed to have instances that work. An abstract class represents a
concept; classes derived from it represent implementations of the concept. For
example, IControl is the abstract base class for control view windows; the
ICanvas and IListBox classes are controls derived from IControl. An abstract
class must have at least one pure virtual function.

See also  base class.


ΓòÉΓòÉΓòÉ <hidden> access ΓòÉΓòÉΓòÉ

A property of a class that determines whether a class member is accessible in
an expression or declaration.


ΓòÉΓòÉΓòÉ <hidden> action ΓòÉΓòÉΓòÉ

A specification of a function that a part can perform. The visual builder uses
action specifications to generate connections between parts. Actions are
resolved to member function calls in the generated code.

Compare to  event and  attribute.


ΓòÉΓòÉΓòÉ <hidden> argument ΓòÉΓòÉΓòÉ

A data element, or value, included as part of a member function call. Arguments
provide additional information that the called member function can use to
perform the requested operation.


ΓòÉΓòÉΓòÉ <hidden> attribute ΓòÉΓòÉΓòÉ

A specification of a property of a part. For example, a customer part could
have a name attribute and an address attribute. An attribute can itself be a
part with its own behavior and attributes.

The visual builder uses attribute specifications to generate code to get and
set part properties.

Compare to  event and  action.


ΓòÉΓòÉΓòÉ <hidden> attribute-to-action connection ΓòÉΓòÉΓòÉ

A connection that starts an action whenever an attribute's value changes. It is
similar to an event-to-action connection because the attribute's event ID is
used to notify the action when the value of the attribute changes.

See also  connection. Compare to  event-to-action connection.


ΓòÉΓòÉΓòÉ <hidden> attribute-to-attribute connection ΓòÉΓòÉΓòÉ

A connection from an attribute of one part to an attribute of another part.
When one attribute is updated, the other attribute is updated automatically.

See also  connection.


ΓòÉΓòÉΓòÉ <hidden> attribute-to-member function connection ΓòÉΓòÉΓòÉ

A connection from an attribute of a part to a member function. The connected
attribute receives its value from the member function, which can make
calculations based on the values of other parts.

See also  connection.


ΓòÉΓòÉΓòÉ <hidden> base class ΓòÉΓòÉΓòÉ

A class from which other classes or parts are derived. A base class may itself
be derived from another base class.

See also  abstract class.


ΓòÉΓòÉΓòÉ <hidden> behavior ΓòÉΓòÉΓòÉ

The set of external characteristics that an object exhibits.


ΓòÉΓòÉΓòÉ <hidden> caller ΓòÉΓòÉΓòÉ

An object that sends a member function call to another object.

Contrast with  receiver.


ΓòÉΓòÉΓòÉ <hidden> category ΓòÉΓòÉΓòÉ

In the Composition Editor, a selectable grouping of parts represented by an
icon in the left-most column. Selecting a category displays the parts belonging
to that category in the next column.

See also  parts palette.


ΓòÉΓòÉΓòÉ <hidden> class ΓòÉΓòÉΓòÉ

An aggregate that can contain functions, types, and user-defined operators, in
addition to data. Classes can be defined hierarchically, allowing one class to
be an expansion of another, and can restrict access to its members.


ΓòÉΓòÉΓòÉ <hidden> Class Editor ΓòÉΓòÉΓòÉ

The editor you use to specify the names of files that Visual Builder writes to
when you generate default code. You can also use this editor to do the
following:

     Enter a description of the part
     Specify a different .vbb file in which to store the part
     See the name of the part's base class
     Modify the part's default constructor
     Enter additional constructor and destructor code
     Specify a .lib file for the part
     Specify a resource DLL and ID to assign an icon to the part
     Specify other files that you want to include when you build your
      application

 Compare to  Composition Editor and  Part Interface Editor.


ΓòÉΓòÉΓòÉ <hidden> class hierarchy ΓòÉΓòÉΓòÉ

A tree-like structure showing relationships among object classes. It places one
abstract class at the top (a base class) and one or more layers of less
abstract classes below it.


ΓòÉΓòÉΓòÉ <hidden> class library ΓòÉΓòÉΓòÉ

A collection of classes.


ΓòÉΓòÉΓòÉ <hidden> class member function ΓòÉΓòÉΓòÉ

See  member function.


ΓòÉΓòÉΓòÉ <hidden> client area object ΓòÉΓòÉΓòÉ

An intermediate window between a frame window (IFrameWindow) and its controls
and other child windows.


ΓòÉΓòÉΓòÉ <hidden> client object ΓòÉΓòÉΓòÉ

An object that requests services from other objects.


ΓòÉΓòÉΓòÉ <hidden> collection ΓòÉΓòÉΓòÉ

A set of features in which each feature is an object.


ΓòÉΓòÉΓòÉ <hidden> Common User Access (CUA) ΓòÉΓòÉΓòÉ

An IBM architecture for designing graphical user interfaces using a set of
standard components and terminology.


ΓòÉΓòÉΓòÉ <hidden> composite part ΓòÉΓòÉΓòÉ

A part that is composed of a part and one or more subparts. A composite part
can contain visual parts, nonvisual parts, or both.

See also  nonvisual part, part, subpart, and  visual part.


ΓòÉΓòÉΓòÉ <hidden> Composition Editor ΓòÉΓòÉΓòÉ

A view that is used to build a graphical user interface and to make connections
between parts.

Compare to  Class Editor and  Part Interface Editor.


ΓòÉΓòÉΓòÉ <hidden> concrete class ΓòÉΓòÉΓòÉ

A subclass of an abstract class that is a specialization of the abstract class.


ΓòÉΓòÉΓòÉ <hidden> connection ΓòÉΓòÉΓòÉ

A formal, explicit relationship between parts. Making connections is the basic
technique for building any visual application because that defines the way in
which parts communicate with one another. The visual builder generates the code
that then implements these connections.

See also  attribute-to-action connection, attribute-to-attribute connection,
attribute-to-member function connection, parameter connection, custom logic
connection, event-to-action connection, event-to-attribute connection, and
event-to-member function connection.


ΓòÉΓòÉΓòÉ <hidden> const ΓòÉΓòÉΓòÉ

An attribute of a data object that declares that the object cannot be changed.


ΓòÉΓòÉΓòÉ <hidden> construction from parts ΓòÉΓòÉΓòÉ

A software development technology in which applications are assembled from
existing and reusable software components, known as parts.


ΓòÉΓòÉΓòÉ <hidden> constructor ΓòÉΓòÉΓòÉ

A special class member function that has the same name as the class and is used
to construct and possibly initialize class objects.


ΓòÉΓòÉΓòÉ <hidden> CUA ΓòÉΓòÉΓòÉ

See  Common User Access.


ΓòÉΓòÉΓòÉ <hidden> cursored emphasis ΓòÉΓòÉΓòÉ

When the selection cursor is on a choice, that choice has cursored emphasis.


ΓòÉΓòÉΓòÉ <hidden> custom logic connection ΓòÉΓòÉΓòÉ

A connection that causes your customized C or C++ code to be run. This
connection can be triggered either when an attribute's value changes or an
event occurs.


ΓòÉΓòÉΓòÉ <hidden> data abstraction ΓòÉΓòÉΓòÉ

A data type with a private representation and a public set of operations. The
C++ language uses the concept of classes to implement data abstraction.


ΓòÉΓòÉΓòÉ <hidden> data member ΓòÉΓòÉΓòÉ

Private data that belongs to a given object and is hidden from direct access by
all other objects. Data members can only be accessed by the member functions of
the defining class and its subclasses.


ΓòÉΓòÉΓòÉ <hidden> data model ΓòÉΓòÉΓòÉ

A combination of the base classes and parts shipped with the product and the
classes and parts you save and create. They are saved in a file named
vbbase.vbb.


ΓòÉΓòÉΓòÉ <hidden> data object ΓòÉΓòÉΓòÉ

A storage area used to hold a value.


ΓòÉΓòÉΓòÉ <hidden> declaration ΓòÉΓòÉΓòÉ

A description that makes an external object or function available to a function
or a block.


ΓòÉΓòÉΓòÉ <hidden> DEF file ΓòÉΓòÉΓòÉ

See  module definition file.


ΓòÉΓòÉΓòÉ <hidden> derivation ΓòÉΓòÉΓòÉ

The creation of a new or abstract class from an existing or base class.


ΓòÉΓòÉΓòÉ <hidden> destructor ΓòÉΓòÉΓòÉ

A special class member function that has the same name as the class and is used
to destruct class objects.


ΓòÉΓòÉΓòÉ <hidden> DLL ΓòÉΓòÉΓòÉ

See  dynamic link library.


ΓòÉΓòÉΓòÉ <hidden> dynamic link library (DLL) ΓòÉΓòÉΓòÉ

In OS/2, a library containing data and code objects that can be used by
programs or applications during loading or at run time. Although they are not
part of the program's executable (.exe) file, they are sometimes required for
an .exe file to run properly.


ΓòÉΓòÉΓòÉ <hidden> encapsulation ΓòÉΓòÉΓòÉ

The hiding of a software object's internal representation. The object provides
an interface that queries and manipulates the data without exposing its
underlying structure.


ΓòÉΓòÉΓòÉ <hidden> event ΓòÉΓòÉΓòÉ

A specification of a notification from a part.

Compare to  action, attribute, and  part event.


ΓòÉΓòÉΓòÉ <hidden> event-to-action connection ΓòÉΓòÉΓòÉ

A connection that causes an action to be performed when an event occurs.

See also  connection.


ΓòÉΓòÉΓòÉ <hidden> event-to-attribute connection ΓòÉΓòÉΓòÉ

A connection that changes the value of an attribute when a certain event
occurs.

See also  connection.


ΓòÉΓòÉΓòÉ <hidden> event-to-member function connection ΓòÉΓòÉΓòÉ

A connection from an event of a part to a member function. When the connected
event occurs, the member function is executed.

See also  connection.


ΓòÉΓòÉΓòÉ <hidden> expansion area ΓòÉΓòÉΓòÉ

The section of a multicell canvas between the current cell grid and the outer
edge of the canvas. Visually, this area is bounded by the rightmost column
gridline and the bottommost row gridline.


ΓòÉΓòÉΓòÉ <hidden> feature ΓòÉΓòÉΓòÉ

A major component of a software product that can be installed separately.

In Visual Builder, an action, attribute, or event that is available from a
part's part interface and that other parts can connect to.


ΓòÉΓòÉΓòÉ <hidden> full attribute ΓòÉΓòÉΓòÉ

An attribute that has all of the behaviors and characteristics that an
attribute can have:  a data member, a get member function, a set member
function, and an event identifier.


ΓòÉΓòÉΓòÉ <hidden> free-form surface ΓòÉΓòÉΓòÉ

The large open area of the Composition Editor window. The free-form surface
holds the visual parts contained in the views you build and representations of
the nonvisual parts (models) that your application includes.


ΓòÉΓòÉΓòÉ <hidden> graphical user interface (GUI) ΓòÉΓòÉΓòÉ

A type of interface that enables users to communicate with a program by
manipulating graphical features, rather than by entering commands. Typically, a
graphical user interface includes a combination of graphics, pointing devices,
menu bars and other menus, overlapping windows, and icons.


ΓòÉΓòÉΓòÉ <hidden> GUI ΓòÉΓòÉΓòÉ

See  graphical user interface.


ΓòÉΓòÉΓòÉ <hidden> handles ΓòÉΓòÉΓòÉ

Small squares that appear on the corners of a selected visual part in the
visual builder. Handles are used to resize parts.

Compare to  primary selection.


ΓòÉΓòÉΓòÉ <hidden> header file ΓòÉΓòÉΓòÉ

A file that contains system-defined control information that precedes user
data.


ΓòÉΓòÉΓòÉ <hidden> inheritance ΓòÉΓòÉΓòÉ

A mechanism by which an object class can use the attributes, relationships, and
member functions defined in more abstract classes related to it (its base
classes).

An object-oriented programming technique that allows you to use existing
classes as bases for creating other classes.


ΓòÉΓòÉΓòÉ <hidden> instance ΓòÉΓòÉΓòÉ

Synonym for  object, a particular instantiation of a data type.


ΓòÉΓòÉΓòÉ <hidden> legacy code ΓòÉΓòÉΓòÉ

Existing code that a user might have. Legacy applications often have
character-based, nongraphical user interfaces; usually they are written in a
nonobject-oriented language, such as C or COBOL.


ΓòÉΓòÉΓòÉ <hidden> loaded ΓòÉΓòÉΓòÉ

The state of the mouse pointer between the time you select a part from the
parts palette and deposit the part on the free-form surface.


ΓòÉΓòÉΓòÉ <hidden> main part ΓòÉΓòÉΓòÉ

The part that users see when they start an application. This is the part from
which the main() function C++ code for the application is generated.

The main part is a special kind of composite part.

See also  part and  subpart.


ΓòÉΓòÉΓòÉ <hidden> member ΓòÉΓòÉΓòÉ

A data object in a structure or a union.

In C++, classes and structures can also contain functions and types as members.


ΓòÉΓòÉΓòÉ <hidden> member function ΓòÉΓòÉΓòÉ

An operator or function that is declared as a member of a class. A member
function has access to the private and protected data members and member
functions of objects of its class.


ΓòÉΓòÉΓòÉ <hidden> member function call ΓòÉΓòÉΓòÉ

A communication from one object to another that requests the receiving object
to execute a member function.

A member function call consists of a member function name that indicates the
requested member function and the arguments to be used in executing the member
function. The member function call always returns some object to the requesting
object as the result of performing the member function.

Synonym for  message.


ΓòÉΓòÉΓòÉ <hidden> member function name ΓòÉΓòÉΓòÉ

The component of a member function call that specifies the requested operation.


ΓòÉΓòÉΓòÉ <hidden> message ΓòÉΓòÉΓòÉ

A request from one object that the receiving object implement a member
function. Because data is encapsulated and not directly accessible, a message
is the only way to send data from one object to another. Each message specifies
the name of the receiving object, the member function to be implemented, and
any arguments the member function needs for implementation.

Synonym for  member function call.


ΓòÉΓòÉΓòÉ <hidden> model ΓòÉΓòÉΓòÉ

A nonvisual part that represents the state and behavior of a object, such as a
customer or an account.

Contrast with  view.


ΓòÉΓòÉΓòÉ <hidden> module definition file ΓòÉΓòÉΓòÉ

A file that describes the code segments within a load module.

Synonym for DEF file.


ΓòÉΓòÉΓòÉ <hidden> nested class ΓòÉΓòÉΓòÉ

A class defined within the scope of another class.


ΓòÉΓòÉΓòÉ <hidden> nonvisual part ΓòÉΓòÉΓòÉ

A part that has no visual representation at run time. A nonvisual part
typically represents some real-world object that exists in the business
environment.

Compare to  model. Contrast with  view and  visual part.


ΓòÉΓòÉΓòÉ <hidden> no-event attribute ΓòÉΓòÉΓòÉ

An attribute that does not have an event identifier.


ΓòÉΓòÉΓòÉ <hidden> no-set attribute ΓòÉΓòÉΓòÉ

An attribute that does not have a set member function.


ΓòÉΓòÉΓòÉ <hidden> notebook part ΓòÉΓòÉΓòÉ

A visual part that resembles a bound notebook containing pages separated into
sections by tabbed divider pages. A user can turn the pages of a notebook or
select the tabs to move from one section to another.


ΓòÉΓòÉΓòÉ <hidden> object ΓòÉΓòÉΓòÉ

A computer representation of something that a user can work with to perform a
task. An object can appear as text or an icon.

A collection of data and member functions that operate on that data, which
together represent a logical entity in the system. In object-oriented
programming, objects are grouped into classes that share common data
definitions and member functions. Each object in the class is said to be an
instance of the class.

An instance of an object class consisting of attributes, a data structure, and
operational member functions. It can represent a person, place, thing, event,
or concept. Each instance has the same properties, attributes, and member
functions as other instances of the object class, though it has unique values
assigned to its attributes.


ΓòÉΓòÉΓòÉ <hidden> object class ΓòÉΓòÉΓòÉ

A template for defining the attributes and member functions of an object. An
object class can contain other object classes. An individual representation of
an object class is called an object.


ΓòÉΓòÉΓòÉ <hidden> object factory ΓòÉΓòÉΓòÉ

A nonvisual part capable of dynamically creating new instances of a specified
part. For example, during the execution of an application, an object factory
can create instances of a new class to collect the data being generated.


ΓòÉΓòÉΓòÉ <hidden> object-oriented programming ΓòÉΓòÉΓòÉ

A programming approach based on the concepts of data abstraction and
inheritance. Unlike procedural programming techniques, object-oriented
programming concentrates on those data objects that comprise the problem and
how they are manipulated, not on how something is accomplished.


ΓòÉΓòÉΓòÉ <hidden> observer ΓòÉΓòÉΓòÉ

An object that receives notification from a notifier object.


ΓòÉΓòÉΓòÉ <hidden> operation ΓòÉΓòÉΓòÉ

A member function or service that can be requested of an object.


ΓòÉΓòÉΓòÉ <hidden> overloading ΓòÉΓòÉΓòÉ

An object-oriented programming technique that allows you to redefine functions
and most standard C++ operators when the functions and operators are used with
class types.


ΓòÉΓòÉΓòÉ <hidden> palette ΓòÉΓòÉΓòÉ

See  parts palette.


ΓòÉΓòÉΓòÉ <hidden> parameter connection ΓòÉΓòÉΓòÉ

A connection that satisfies a parameter of an action or member function by
supplying either an attribute's value or the return value of an action, member
function, or custom logic. The parameter is always the source of the
connection.

See also  connection.


ΓòÉΓòÉΓòÉ <hidden> parent class ΓòÉΓòÉΓòÉ

The class from which another part or class inherits data, member functions, or
both.


ΓòÉΓòÉΓòÉ <hidden> part ΓòÉΓòÉΓòÉ

A self-contained software object with a standardized public interface,
consisting of a set of external features that allow the part to interact with
other parts. A part is implemented as a class that supports the INotifier
protocol and has a part interface defined.

The parts on the palette can be used as templates to create instances or
objects.


ΓòÉΓòÉΓòÉ <hidden> part event ΓòÉΓòÉΓòÉ

A representation of a change that occurs to a part. The events on a part's
interface enable other interested parts to receive notification when something
about the part changes. For example, a push button generates an event signaling
that it has been clicked, which might cause another part to display a window.


ΓòÉΓòÉΓòÉ <hidden> part event ID ΓòÉΓòÉΓòÉ

The name of a part static-data member used to identify which notification is
being signaled.


ΓòÉΓòÉΓòÉ <hidden> part interface ΓòÉΓòÉΓòÉ

A set of external features that allows a part to interact with other parts. A
part's interface is made up of three characteristics: attributes, actions, and
events.


ΓòÉΓòÉΓòÉ <hidden> Part Interface Editor ΓòÉΓòÉΓòÉ

An editor that the application developer uses to create and modify attributes,
actions, and events, which together make up the interface of a part.

Compare to  Class Editor and  Composition Editor.


ΓòÉΓòÉΓòÉ <hidden> parts palette ΓòÉΓòÉΓòÉ

The parts palette holds a collection of visual and nonvisual parts used in
building additional parts for an application. The parts palette is organized
into categories. Application developers can add parts to the palette for use in
defining applications or other parts.


ΓòÉΓòÉΓòÉ <hidden> preferred features ΓòÉΓòÉΓòÉ

A subset of the part's features that appear in a pop-up connection menu.
Generally, they are the features used most often.


ΓòÉΓòÉΓòÉ <hidden> primary selection ΓòÉΓòÉΓòÉ

In the Composition Editor, the part used as a base for an action that affects
several parts. For example, an alignment tool will align all selected parts
with the primary selection. Primary selection is indicated by closed (solid)
selection handles, while the other selected parts have open selection handles.

See also  selection handles.


ΓòÉΓòÉΓòÉ <hidden> private ΓòÉΓòÉΓòÉ

Pertaining to a class member that is accessible only to member functions and
friends of that class.


ΓòÉΓòÉΓòÉ <hidden> process ΓòÉΓòÉΓòÉ

A program running under OS/2, along with the resources associated with it
(memory, threads, file system resources, and so on).


ΓòÉΓòÉΓòÉ <hidden> program ΓòÉΓòÉΓòÉ

One or more files containing a set of instructions conforming to a particular
programming language syntax.

A self-contained, executable module. Multiple copies of the same program can be
run in different processes.


ΓòÉΓòÉΓòÉ <hidden> protected ΓòÉΓòÉΓòÉ

Pertaining to a class member that is only accessible to member functions and
friends of that class, or to member functions and friends of classes derived
from that class.


ΓòÉΓòÉΓòÉ <hidden> prototype ΓòÉΓòÉΓòÉ

A function declaration or definition that includes both the return type of the
function and the types of its arguments.


ΓòÉΓòÉΓòÉ <hidden> primitive part ΓòÉΓòÉΓòÉ

A basic building block of other parts. A primitive part can be relatively
complex in terms of the function it provides.


ΓòÉΓòÉΓòÉ <hidden> process ΓòÉΓòÉΓòÉ

A collection of code, data, and other system resources, including at least one
thread of execution, that performs a data processing task.


ΓòÉΓòÉΓòÉ <hidden> property ΓòÉΓòÉΓòÉ

A unique characteristic of a part.


ΓòÉΓòÉΓòÉ <hidden> pure virtual function ΓòÉΓòÉΓòÉ

A virtual function that has a function definition of = 0;.


ΓòÉΓòÉΓòÉ <hidden> receiver ΓòÉΓòÉΓòÉ

The object that receives a member function call.

Contrast with  caller.


ΓòÉΓòÉΓòÉ <hidden> resource file ΓòÉΓòÉΓòÉ

A file that contains data used by an application, such as text strings and
icons.


ΓòÉΓòÉΓòÉ <hidden> selection handles ΓòÉΓòÉΓòÉ

In the Composition Editor, small squares that appear on the corners of a
selected visual part. Selection handles are used to resize parts.

See also  primary selection.


ΓòÉΓòÉΓòÉ <hidden> server ΓòÉΓòÉΓòÉ

A computer that provides services to multiple users or workstations in a
network; for example, a file server, a print server, or a mail server.


ΓòÉΓòÉΓòÉ <hidden> service ΓòÉΓòÉΓòÉ

A specific behavior that an object is responsible for exhibiting.


ΓòÉΓòÉΓòÉ <hidden> settings view ΓòÉΓòÉΓòÉ

A view of a part that provides a way to display and set the attributes and
options associated with the part.


ΓòÉΓòÉΓòÉ <hidden> sticky ΓòÉΓòÉΓòÉ

In the Composition Editor, the mode that enables you to add multiple parts of
the same class (for example, three push buttons) without going back and forth
between the parts palette and the free-form surface.


ΓòÉΓòÉΓòÉ <hidden> structure ΓòÉΓòÉΓòÉ

A construct that contains an ordered group of data objects. Unlike an array,
the data objects within a structure can have varied data types.


ΓòÉΓòÉΓòÉ <hidden> subpart ΓòÉΓòÉΓòÉ

A part that is used to create another part.

See also  nonvisual part, part, and  visual part.


ΓòÉΓòÉΓòÉ <hidden> superclass ΓòÉΓòÉΓòÉ

See  abstract class and  base class.


ΓòÉΓòÉΓòÉ <hidden> tear-off attribute ΓòÉΓòÉΓòÉ

An attribute that an application developer has exposed to work with as though
it were a stand-alone part.


ΓòÉΓòÉΓòÉ <hidden> template ΓòÉΓòÉΓòÉ

A family of classes or functions with variable types.


ΓòÉΓòÉΓòÉ <hidden> thread ΓòÉΓòÉΓòÉ

A unit of execution within a process.


ΓòÉΓòÉΓòÉ <hidden> tool bar ΓòÉΓòÉΓòÉ

The strip of icons along the top of the free-form surface. The tool bar
contains tools to help you construct composite parts.


ΓòÉΓòÉΓòÉ <hidden> UI ΓòÉΓòÉΓòÉ

See  user interface.


ΓòÉΓòÉΓòÉ <hidden> unloaded ΓòÉΓòÉΓòÉ

The state of the mouse pointer before you select a part from the parts palette
and after you deposit a part on the free-form surface. In addition, you can
unload the mouse pointer by pressing the Esc key.


ΓòÉΓòÉΓòÉ <hidden> user interface (UI) ΓòÉΓòÉΓòÉ

The hardware, software, or both that enable a user to interact with a computer.

The term user interface normally refers to the visual presentation and its
underlying software with which a user interacts.


ΓòÉΓòÉΓòÉ <hidden> variable ΓòÉΓòÉΓòÉ

A storage place within an object for a data feature. The data feature is an
object, such as number or date, stored as an attribute of the containing
object.

A part that receives an identity at run time. A variable by itself contains no
data or program logic; it must be connected such that it receives runtime
identity from a part elsewhere in the application.


ΓòÉΓòÉΓòÉ <hidden> view ΓòÉΓòÉΓòÉ

A visual part, such as a window, push button, or entry field.

A visual representation that can display and change the underlying model
objects of an application. Views are both the end result of developing an
application and the basic unit of composition of user interfaces.

Compare to  visual part. Contrast with  model.


ΓòÉΓòÉΓòÉ <hidden> virtual function ΓòÉΓòÉΓòÉ

A function of a class that is declared with the keyword virtual. The
implementation that is executed when you make a call to a virtual function
depends on the type of the object for which it is called. This is determined at
run time.


ΓòÉΓòÉΓòÉ <hidden> visual part ΓòÉΓòÉΓòÉ

A part that has a visual representation at run time. Visual parts, such as
windows, push buttons, and entry fields, make up the user interface of an
application.

Compare to  view. Contrast with  nonvisual part.


ΓòÉΓòÉΓòÉ <hidden> visual programming tool ΓòÉΓòÉΓòÉ

A tool that provides a means for specifying programs graphically. Application
programmers write applications by manipulating graphical representations of
components.


ΓòÉΓòÉΓòÉ <hidden> white space ΓòÉΓòÉΓòÉ

Space characters, tab characters, form-feed characters, and new-line
characters.


ΓòÉΓòÉΓòÉ <hidden> window ΓòÉΓòÉΓòÉ

A rectangular area of the screen with visible boundaries in which information
is displayed. Windows can overlap on the screen, giving it the appearance of
one window being on top of another.

In the Composition Editor, a window is a part that can be used as a container
for other visual parts, such as push buttons.