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DOS/V Power Report 1998 February
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Event.java
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/*
* @(#)Event.java 1.55 97/01/27
*
* Copyright (c) 1995, 1996 Sun Microsystems, Inc. All Rights Reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
* SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
* SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
* THIS SOFTWARE OR ITS DERIVATIVES.
*
* CopyrightVersion 1.1_beta
*
*/
package java.awt;
import java.awt.event.*;
import java.io.*;
/**
* Event is a platform-independent class that encapsulates events from
* the local Graphical User Interface(GUI) platform.<p>
*
* The event contains an <a href="#id"> id</a> which indicates the type
* of event it is and which other Event variables are relavent for the event.
* For keyboard events, <a href="#key"> key</a> will contain a value indicating
* the key that was activated and <a href="#modifiers"> modifiers</a> will
* contain the modifiers. For KEY_PRESS and KEY_RELEASE event ids, the value of key
* will be the unicode character code for the key; for KEY_ACTION and KEY_ACTION_RELEASE,
* the value of key will be one of the defined action-key identifiers in the Event
* class (PGUP, PGDN, F1, F2, etc).
*
* @version 1.55 01/27/97
* @author Sami Shaio
*/
public class Event implements java.io.Serializable {
private transient int data;
/* Modifier constants */
/**
* The shift modifier constant.
*/
public static final int SHIFT_MASK = 1 << 0;
/**
* The control modifier constant.
*/
public static final int CTRL_MASK = 1 << 1;
/**
* The meta modifier constant.
*/
public static final int META_MASK = 1 << 2;
/**
* The alt modifier constant.
*/
public static final int ALT_MASK = 1 << 3;
/* Action keys */
/**
* The home action-key.
*/
public static final int HOME = 1000;
/**
* The end action-key.
*/
public static final int END = 1001;
/**
* The page up action-key.
*/
public static final int PGUP = 1002;
/**
* The page down action-key.
*/
public static final int PGDN = 1003;
/**
* The up arrow action-key.
*/
public static final int UP = 1004;
/**
* The down arrow action-key.
*/
public static final int DOWN = 1005;
/**
* The left arrow action-key.
*/
public static final int LEFT = 1006;
/**
* The right arrow action-key.
*/
public static final int RIGHT = 1007;
/**
* The F1 function action-key.
*/
public static final int F1 = 1008;
/**
* The F2 function action-key.
*/
public static final int F2 = 1009;
/**
* The F3 function action-key.
*/
public static final int F3 = 1010;
/**
* The F4 function action-key.
*/
public static final int F4 = 1011;
/**
* The F5 function action-key.
*/
public static final int F5 = 1012;
/**
* The F6 function action-key.
*/
public static final int F6 = 1013;
/**
* The F7 function action-key.
*/
public static final int F7 = 1014;
/**
* The F8 function action-key.
*/
public static final int F8 = 1015;
/**
* The F9 function action-key.
*/
public static final int F9 = 1016;
/**
* The F10 function action-key.
*/
public static final int F10 = 1017;
/**
* The F11 function action-key.
*/
public static final int F11 = 1018;
/**
* The F12 function action-key.
*/
public static final int F12 = 1019;
/**
* The PrintScreen action-key.
*/
public static final int PRINT_SCREEN = 1020;
/**
* The ScrollLock action-key.
*/
public static final int SCROLL_LOCK = 1021;
/**
* The CapsLock action-key.
*/
public static final int CAPS_LOCK = 1022;
/**
* The NumLock action-key.
*/
public static final int NUM_LOCK = 1023;
/**
* The Pause action-key.
*/
public static final int PAUSE = 1024;
/**
* The Insert key.
*/
public static final int INSERT = 1025;
/* Non-action keys */
/**
* The Enter key.
*/
public static final int ENTER = '\n';
/**
* The BackSpace key.
*/
public static final int BACK_SPACE = '\b';
/**
* The Tab key.
*/
public static final int TAB = '\t';
/**
* The Escape key.
*/
public static final int ESCAPE = 27;
/**
* The Delete key.
*/
public static final int DELETE = 127;
/* Base for all window events. */
private static final int WINDOW_EVENT = 200;
/**
* The destroy window event.
*/
public static final int WINDOW_DESTROY = 1 + WINDOW_EVENT;
/**
* The expose window event.
*/
public static final int WINDOW_EXPOSE = 2 + WINDOW_EVENT;
/**
* The iconify window event.
*/
public static final int WINDOW_ICONIFY = 3 + WINDOW_EVENT;
/**
* The de-iconify window event.
*/
public static final int WINDOW_DEICONIFY = 4 + WINDOW_EVENT;
/**
* The move window event.
*/
public static final int WINDOW_MOVED = 5 + WINDOW_EVENT;
/* Base for all keyboard events. */
private static final int KEY_EVENT = 400;
/**
* The key press keyboard event.
*/
public static final int KEY_PRESS = 1 + KEY_EVENT;
/**
* The key release keyboard event.
*/
public static final int KEY_RELEASE = 2 + KEY_EVENT;
/**
* The action-key press keyboard event.
*/
public static final int KEY_ACTION = 3 + KEY_EVENT;
/**
* The action-key release keyboard event.
*/
public static final int KEY_ACTION_RELEASE = 4 + KEY_EVENT;
/* Base for all mouse events. */
private static final int MOUSE_EVENT = 500;
/**
* The mouse down event.
*/
public static final int MOUSE_DOWN = 1 + MOUSE_EVENT;
/**
* The mouse up event.
*/
public static final int MOUSE_UP = 2 + MOUSE_EVENT;
/**
* The mouse move event.
*/
public static final int MOUSE_MOVE = 3 + MOUSE_EVENT;
/**
* The mouse enter event.
*/
public static final int MOUSE_ENTER = 4 + MOUSE_EVENT;
/**
* The mouse exit event.
*/
public static final int MOUSE_EXIT = 5 + MOUSE_EVENT;
/**
* The mouse drag event.
*/
public static final int MOUSE_DRAG = 6 + MOUSE_EVENT;
/* Scrolling events */
private static final int SCROLL_EVENT = 600;
/**
* The line up scroll event.
*/
public static final int SCROLL_LINE_UP = 1 + SCROLL_EVENT;
/**
* The line down scroll event.
*/
public static final int SCROLL_LINE_DOWN = 2 + SCROLL_EVENT;
/**
* The page up scroll event.
*/
public static final int SCROLL_PAGE_UP = 3 + SCROLL_EVENT;
/**
* The page down scroll event.
*/
public static final int SCROLL_PAGE_DOWN = 4 + SCROLL_EVENT;
/**
* The absolute scroll event.
*/
public static final int SCROLL_ABSOLUTE = 5 + SCROLL_EVENT;
/**
* The scroll begin event.
*/
public static final int SCROLL_BEGIN = 6 + SCROLL_EVENT;
/**
* The scroll end event.
*/
public static final int SCROLL_END = 7 + SCROLL_EVENT;
/* List Events */
private static final int LIST_EVENT = 700;
/* Event sent when an item has been selected */
public static final int LIST_SELECT = 1 + LIST_EVENT;
/* Event sent when an item has been deselected */
public static final int LIST_DESELECT = 2 + LIST_EVENT;
/* Misc Event */
private static final int MISC_EVENT = 1000;
/**
* An action event.
*/
public static final int ACTION_EVENT = 1 + MISC_EVENT;
/**
* A file loading event.
*/
public static final int LOAD_FILE = 2 + MISC_EVENT;
/**
* A file saving event.
*/
public static final int SAVE_FILE = 3 + MISC_EVENT;
/**
* A component gained the focus.
*/
public static final int GOT_FOCUS = 4 + MISC_EVENT;
/**
* A component lost the focus.
*/
public static final int LOST_FOCUS = 5 + MISC_EVENT;
/**
* The target component.
*/
public Object target;
/**
* The time stamp.
*/
public long when;
/**
* The type of this event.
*/
public int id;
/**
* The x coordinate of the event.
*/
public int x;
/**
* The y coordinate of the event.
*/
public int y;
/**
* The key code that was pressed in a keyboard event.
*/
public int key;
/**
* The key character that was pressed in a keyboard event.
*/
// public char keyChar;
/**
* The state of the modifier keys.
*/
public int modifiers;
/**
* The number of consecutive clicks. This field is relevant only for
* MOUSE_DOWN events. If the field isn't set it will be 0. Otherwise,
* it will be 1 for single-clicks, 2 for double-clicks, and so on.
*/
public int clickCount;
/**
* An arbitrary argument.
*/
public Object arg;
/**
* The next event. Used when putting events into a linked list.
*/
public Event evt;
/* table for mapping old Event action keys to KeyEvent virtual keys. */
private static final int actionKeyCodes[][] = {
/* virtual key action key */
{ KeyEvent.VK_HOME, Event.HOME },
{ KeyEvent.VK_END, Event.END },
{ KeyEvent.VK_PAGE_UP, Event.PGUP },
{ KeyEvent.VK_PAGE_DOWN, Event.PGDN },
{ KeyEvent.VK_UP, Event.UP },
{ KeyEvent.VK_DOWN, Event.DOWN },
{ KeyEvent.VK_LEFT, Event.LEFT },
{ KeyEvent.VK_RIGHT, Event.RIGHT },
{ KeyEvent.VK_F1, Event.F1 },
{ KeyEvent.VK_F2, Event.F2 },
{ KeyEvent.VK_F3, Event.F3 },
{ KeyEvent.VK_F4, Event.F4 },
{ KeyEvent.VK_F5, Event.F5 },
{ KeyEvent.VK_F6, Event.F6 },
{ KeyEvent.VK_F7, Event.F7 },
{ KeyEvent.VK_F8, Event.F8 },
{ KeyEvent.VK_F9, Event.F9 },
{ KeyEvent.VK_F10, Event.F10 },
{ KeyEvent.VK_F11, Event.F11 },
{ KeyEvent.VK_F12, Event.F12 },
{ KeyEvent.VK_PRINTSCREEN, Event.PRINT_SCREEN },
{ KeyEvent.VK_SCROLL_LOCK, Event.SCROLL_LOCK },
{ KeyEvent.VK_CAPS_LOCK, Event.CAPS_LOCK },
{ KeyEvent.VK_NUM_LOCK, Event.NUM_LOCK },
{ KeyEvent.VK_PAUSE, Event.PAUSE },
{ KeyEvent.VK_INSERT, Event.INSERT }
};
// This field controls whether or not the event is sent back
// down to the peer once the target has processed it -
// false means it's sent to the peer, true means it's not.
private boolean consumed = false;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 5488922509400504703L;
/**
* Constructs an event with the specified target component, time stamp,
* event type, x and y coordinates, keyboard key, state of the modifier
* keys and argument.
* @param target the target component
* @param when the time stamp
* @param id the event type
* @param x the x coordinate
* @param y the y coordinate
* @param key the key pressed in a keyboard event
* @param modifiers the state of the modifier keys
* @param arg the specified argument
*/
public Event(Object target, long when, int id, int x, int y, int key,
int modifiers, Object arg) {
this.target = target;
this.when = when;
this.id = id;
this.x = x;
this.y = y;
this.key = key;
this.modifiers = modifiers;
this.arg = arg;
this.data = 0;
this.clickCount = 0;
switch(id) {
case ACTION_EVENT:
case WINDOW_DESTROY:
case WINDOW_ICONIFY:
case WINDOW_DEICONIFY:
case WINDOW_MOVED:
case SCROLL_LINE_UP:
case SCROLL_LINE_DOWN:
case SCROLL_PAGE_UP:
case SCROLL_PAGE_DOWN:
case SCROLL_ABSOLUTE:
case SCROLL_BEGIN:
case SCROLL_END:
case LIST_SELECT:
case LIST_DESELECT:
consumed = true; // these types are not passed back to peer
break;
default:
}
}
/**
* Constructs an event with the specified target component, time stamp,
* event type, x and y coordinates, keyboard key, state of the modifier
* keys and an argument set to null.
* @param target the target component
* @param when the time stamp
* @param id the event type
* @param x the x coordinate
* @param y the y coordinate
* @param key the key pressed in a keyboard event
* @param modifiers the state of the modifier keys
*/
public Event(Object target, long when, int id, int x, int y, int key, int modifiers) {
this(target, when, id, x, y, key, modifiers, null);
}
/**
* Constructs an event with the specified target component,
* event type, and argument.
* @param target the target component
* @param id the event type
* @param arg the specified argument
*/
public Event(Object target, int id, Object arg) {
this(target, 0, id, 0, 0, 0, 0, arg);
}
/**
* Translates an event relative to the given component. This
* involves at a minimum translating the coordinates so they make
* sense within the given component. It may also involve
* translating a region in the case of an expose event.
* @param x the x coordinate
* @param y the y coordinate
*/
public void translate(int x, int y) {
this.x += x;
this.y += y;
}
/**
* Checks if the shift key is down.
* @see #modifiers
* @see #controlDown
* @see #metaDown
*/
public boolean shiftDown() {
return (modifiers & SHIFT_MASK) != 0;
}
/**
* Checks if the control key is down.
* @see #modifiers
* @see #shiftDown
* @see #metaDown
*/
public boolean controlDown() {
return (modifiers & CTRL_MASK) != 0;
}
/**
* Checks if the meta key is down.
* @see #modifiers
* @see #shiftDown
* @see #controlDown
*/
public boolean metaDown() {
return (modifiers & META_MASK) != 0;
}
void consume() {
switch(id) {
case KEY_PRESS:
case KEY_RELEASE:
case KEY_ACTION:
case KEY_ACTION_RELEASE:
consumed = true;
break;
default:
// event type cannot be consumed
}
}
boolean isConsumed() {
return consumed;
}
/*
* Returns the integer key-code associated with the key in this event,
* as described in java.awt.Event.
*/
static int getOldEventKey(KeyEvent e) {
int keyCode = e.getKeyCode();
for (int i = 0; i < actionKeyCodes.length; i++) {
if (actionKeyCodes[i][0] == keyCode) {
return actionKeyCodes[i][1];
}
}
return (int)e.getKeyChar();
}
/*
* Returns a new KeyEvent char which corresponds to the int key
* of this old event.
*/
char getKeyEventChar() {
for (int i = 0; i < actionKeyCodes.length; i++) {
if (actionKeyCodes[i][1] == key) {
return KeyEvent.CHAR_UNDEFINED;
}
}
return (char)key;
}
/**
* Returns the parameter String of this Event.
*/
protected String paramString() {
String str = "id=" + id + ",x=" + x + ",y=" + y;
if (key != 0) {
str += ",key=" + key;
}
if (shiftDown()) {
str += ",shift";
}
if (controlDown()) {
str += ",control";
}
if (metaDown()) {
str += ",meta";
}
if (target != null) {
str += ",target=" + target;
}
if (arg != null) {
str += ",arg=" + arg;
}
return str;
}
/**
* Returns the String representation of this Event's values.
*/
public String toString() {
return getClass().getName() + "[" + paramString() + "]";
}
}