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The Event.java Java example source code
/*
* Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.awt;
import java.awt.event.*;
import java.io.*;
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* <code>Event is a platform-independent class that
* encapsulates events from the platform's Graphical User
* Interface in the Java 1.0 event model. In Java 1.1
* and later versions, the <code>Event class is maintained
* only for backwards compatibility. The information in this
* class description is provided to assist programmers in
* converting Java 1.0 programs to the new event model.
* <p>
* In the Java 1.0 event model, an event contains an
* {@link Event#id} field
* that indicates what type of event it is and which other
* <code>Event variables are relevant for the event.
* <p>
* For keyboard events, {@link Event#key}
* contains a value indicating which key was activated, and
* {@link Event#modifiers} contains the
* modifiers for that event. For the KEY_PRESS and KEY_RELEASE
* event ids, the value of <code>key is the unicode
* character code for the key. For KEY_ACTION and
* KEY_ACTION_RELEASE, the value of <code>key is
* one of the defined action-key identifiers in the
* <code>Event class (PGUP,
* <code>PGDN, F1, F2, etc).
*
* @author Sami Shaio
* @since JDK1.0
*/
public class Event implements java.io.Serializable {
private transient long data;
/* Modifier constants */
/**
* This flag indicates that the Shift key was down when the event
* occurred.
*/
public static final int SHIFT_MASK = 1 << 0;
/**
* This flag indicates that the Control key was down when the event
* occurred.
*/
public static final int CTRL_MASK = 1 << 1;
/**
* This flag indicates that the Meta key was down when the event
* occurred. For mouse events, this flag indicates that the right
* button was pressed or released.
*/
public static final int META_MASK = 1 << 2;
/**
* This flag indicates that the Alt key was down when
* the event occurred. For mouse events, this flag indicates that the
* middle mouse button was pressed or released.
*/
public static final int ALT_MASK = 1 << 3;
/* Action keys */
/**
* The Home key, a non-ASCII action key.
*/
public static final int HOME = 1000;
/**
* The End key, a non-ASCII action key.
*/
public static final int END = 1001;
/**
* The Page Up key, a non-ASCII action key.
*/
public static final int PGUP = 1002;
/**
* The Page Down key, a non-ASCII action key.
*/
public static final int PGDN = 1003;
/**
* The Up Arrow key, a non-ASCII action key.
*/
public static final int UP = 1004;
/**
* The Down Arrow key, a non-ASCII action key.
*/
public static final int DOWN = 1005;
/**
* The Left Arrow key, a non-ASCII action key.
*/
public static final int LEFT = 1006;
/**
* The Right Arrow key, a non-ASCII action key.
*/
public static final int RIGHT = 1007;
/**
* The F1 function key, a non-ASCII action key.
*/
public static final int F1 = 1008;
/**
* The F2 function key, a non-ASCII action key.
*/
public static final int F2 = 1009;
/**
* The F3 function key, a non-ASCII action key.
*/
public static final int F3 = 1010;
/**
* The F4 function key, a non-ASCII action key.
*/
public static final int F4 = 1011;
/**
* The F5 function key, a non-ASCII action key.
*/
public static final int F5 = 1012;
/**
* The F6 function key, a non-ASCII action key.
*/
public static final int F6 = 1013;
/**
* The F7 function key, a non-ASCII action key.
*/
public static final int F7 = 1014;
/**
* The F8 function key, a non-ASCII action key.
*/
public static final int F8 = 1015;
/**
* The F9 function key, a non-ASCII action key.
*/
public static final int F9 = 1016;
/**
* The F10 function key, a non-ASCII action key.
*/
public static final int F10 = 1017;
/**
* The F11 function key, a non-ASCII action key.
*/
public static final int F11 = 1018;
/**
* The F12 function key, a non-ASCII action key.
*/
public static final int F12 = 1019;
/**
* The Print Screen key, a non-ASCII action key.
*/
public static final int PRINT_SCREEN = 1020;
/**
* The Scroll Lock key, a non-ASCII action key.
*/
public static final int SCROLL_LOCK = 1021;
/**
* The Caps Lock key, a non-ASCII action key.
*/
public static final int CAPS_LOCK = 1022;
/**
* The Num Lock key, a non-ASCII action key.
*/
public static final int NUM_LOCK = 1023;
/**
* The Pause key, a non-ASCII action key.
*/
public static final int PAUSE = 1024;
/**
* The Insert key, a non-ASCII action 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 user has asked the window manager to kill the window.
*/
public static final int WINDOW_DESTROY = 1 + WINDOW_EVENT;
/**
* The user has asked the window manager to expose the window.
*/
public static final int WINDOW_EXPOSE = 2 + WINDOW_EVENT;
/**
* The user has asked the window manager to iconify the window.
*/
public static final int WINDOW_ICONIFY = 3 + WINDOW_EVENT;
/**
* The user has asked the window manager to de-iconify the window.
*/
public static final int WINDOW_DEICONIFY = 4 + WINDOW_EVENT;
/**
* The user has asked the window manager to move the window.
*/
public static final int WINDOW_MOVED = 5 + WINDOW_EVENT;
/* Base for all keyboard events. */
private static final int KEY_EVENT = 400;
/**
* The user has pressed a normal key.
*/
public static final int KEY_PRESS = 1 + KEY_EVENT;
/**
* The user has released a normal key.
*/
public static final int KEY_RELEASE = 2 + KEY_EVENT;
/**
* The user has pressed a non-ASCII <em>action key.
* The <code>key field contains a value that indicates
* that the event occurred on one of the action keys, which
* comprise the 12 function keys, the arrow (cursor) keys,
* Page Up, Page Down, Home, End, Print Screen, Scroll Lock,
* Caps Lock, Num Lock, Pause, and Insert.
*/
public static final int KEY_ACTION = 3 + KEY_EVENT;
/**
* The user has released a non-ASCII <em>action key.
* The <code>key field contains a value that indicates
* that the event occurred on one of the action keys, which
* comprise the 12 function keys, the arrow (cursor) keys,
* Page Up, Page Down, Home, End, Print Screen, Scroll Lock,
* Caps Lock, Num Lock, Pause, and Insert.
*/
public static final int KEY_ACTION_RELEASE = 4 + KEY_EVENT;
/* Base for all mouse events. */
private static final int MOUSE_EVENT = 500;
/**
* The user has pressed the mouse button. The <code>ALT_MASK
* flag indicates that the middle button has been pressed.
* The <code>META_MASKflag indicates that the
* right button has been pressed.
* @see java.awt.Event#ALT_MASK
* @see java.awt.Event#META_MASK
*/
public static final int MOUSE_DOWN = 1 + MOUSE_EVENT;
/**
* The user has released the mouse button. The <code>ALT_MASK
* flag indicates that the middle button has been released.
* The <code>META_MASKflag indicates that the
* right button has been released.
* @see java.awt.Event#ALT_MASK
* @see java.awt.Event#META_MASK
*/
public static final int MOUSE_UP = 2 + MOUSE_EVENT;
/**
* The mouse has moved with no button pressed.
*/
public static final int MOUSE_MOVE = 3 + MOUSE_EVENT;
/**
* The mouse has entered a component.
*/
public static final int MOUSE_ENTER = 4 + MOUSE_EVENT;
/**
* The mouse has exited a component.
*/
public static final int MOUSE_EXIT = 5 + MOUSE_EVENT;
/**
* The user has moved the mouse with a button pressed. The
* <code>ALT_MASK flag indicates that the middle
* button is being pressed. The <code>META_MASK flag indicates
* that the right button is being pressed.
* @see java.awt.Event#ALT_MASK
* @see java.awt.Event#META_MASK
*/
public static final int MOUSE_DRAG = 6 + MOUSE_EVENT;
/* Scrolling events */
private static final int SCROLL_EVENT = 600;
/**
* The user has activated the <em>line up
* area of a scroll bar.
*/
public static final int SCROLL_LINE_UP = 1 + SCROLL_EVENT;
/**
* The user has activated the <em>line down
* area of a scroll bar.
*/
public static final int SCROLL_LINE_DOWN = 2 + SCROLL_EVENT;
/**
* The user has activated the <em>page up
* area of a scroll bar.
*/
public static final int SCROLL_PAGE_UP = 3 + SCROLL_EVENT;
/**
* The user has activated the <em>page down
* area of a scroll bar.
*/
public static final int SCROLL_PAGE_DOWN = 4 + SCROLL_EVENT;
/**
* The user has moved the bubble (thumb) in a scroll bar,
* moving to an "absolute" position, rather than to
* an offset from the last position.
*/
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;
/**
* An item in a list has been selected.
*/
public static final int LIST_SELECT = 1 + LIST_EVENT;
/**
* An item in a list has been deselected.
*/
public static final int LIST_DESELECT = 2 + LIST_EVENT;
/* Misc Event */
private static final int MISC_EVENT = 1000;
/**
* This event indicates that the user wants some action to occur.
*/
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. This indicates the component over which the
* event occurred or with which the event is associated.
* This object has been replaced by AWTEvent.getSource()
*
* @serial
* @see java.awt.AWTEvent#getSource()
*/
public Object target;
/**
* The time stamp.
* Replaced by InputEvent.getWhen().
*
* @serial
* @see java.awt.event.InputEvent#getWhen()
*/
public long when;
/**
* Indicates which type of event the event is, and which
* other <code>Event variables are relevant for the event.
* This has been replaced by AWTEvent.getID()
*
* @serial
* @see java.awt.AWTEvent#getID()
*/
public int id;
/**
* The <i>x coordinate of the event.
* Replaced by MouseEvent.getX()
*
* @serial
* @see java.awt.event.MouseEvent#getX()
*/
public int x;
/**
* The <i>y coordinate of the event.
* Replaced by MouseEvent.getY()
*
* @serial
* @see java.awt.event.MouseEvent#getY()
*/
public int y;
/**
* The key code of the key that was pressed in a keyboard event.
* This has been replaced by KeyEvent.getKeyCode()
*
* @serial
* @see java.awt.event.KeyEvent#getKeyCode()
*/
public int key;
/**
* The key character that was pressed in a keyboard event.
*/
// public char keyChar;
/**
* The state of the modifier keys.
* This is replaced with InputEvent.getModifiers()
* In java 1.1 MouseEvent and KeyEvent are subclasses
* of InputEvent.
*
* @serial
* @see java.awt.event.InputEvent#getModifiers()
*/
public int modifiers;
/**
* For <code>MOUSE_DOWN events, this field indicates the
* number of consecutive clicks. For other events, its value is
* <code>0.
* This field has been replaced by MouseEvent.getClickCount().
*
* @serial
* @see java.awt.event.MouseEvent#getClickCount()
*/
public int clickCount;
/**
* An arbitrary argument of the event. The value of this field
* depends on the type of event.
* <code>arg has been replaced by event specific property.
*
* @serial
*/
public Object arg;
/**
* The next event. This field is set when putting events into a
* linked list.
* This has been replaced by EventQueue.
*
* @serial
* @see java.awt.EventQueue
*/
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.
*
* @serial
* @see #isConsumed()
*/
private boolean consumed = false;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 5488922509400504703L;
static {
/* ensure that the necessary native libraries are loaded */
Toolkit.loadLibraries();
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
}
/**
* Initialize JNI field and method IDs for fields that may be
accessed from C.
*/
private static native void initIDs();
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Creates an instance of <code>Event with the specified target
* component, time stamp, event type, <i>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 <i>x coordinate.
* @param y the <i>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:
}
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Creates an instance of <code>Event, with the specified target
* component, time stamp, event type, <i>x and y
* coordinates, keyboard key, state of the modifier keys, and an
* argument set to <code>null.
* @param target the target component.
* @param when the time stamp.
* @param id the event type.
* @param x the <i>x coordinate.
* @param y the <i>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);
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Creates an instance of <code>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);
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Translates this event so that its <i>x and y
* coordinates are increased by <i>dx and dy,
* respectively.
* <p>
* This method translates an event relative to the given component.
* This involves, at a minimum, translating the coordinates into the
* local coordinate system of the given component. It may also involve
* translating a region in the case of an expose event.
* @param dx the distance to translate the <i>x coordinate.
* @param dy the distance to translate the <i>y coordinate.
*/
public void translate(int dx, int dy) {
this.x += dx;
this.y += dy;
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Checks if the Shift key is down.
* @return <code>true if the key is down;
* <code>false otherwise.
* @see java.awt.Event#modifiers
* @see java.awt.Event#controlDown
* @see java.awt.Event#metaDown
*/
public boolean shiftDown() {
return (modifiers & SHIFT_MASK) != 0;
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Checks if the Control key is down.
* @return <code>true if the key is down;
* <code>false otherwise.
* @see java.awt.Event#modifiers
* @see java.awt.Event#shiftDown
* @see java.awt.Event#metaDown
*/
public boolean controlDown() {
return (modifiers & CTRL_MASK) != 0;
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Checks if the Meta key is down.
*
* @return <code>true if the key is down;
* <code>false otherwise.
* @see java.awt.Event#modifiers
* @see java.awt.Event#shiftDown
* @see java.awt.Event#controlDown
*/
public boolean metaDown() {
return (modifiers & META_MASK) != 0;
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
*/
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
}
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
*/
boolean isConsumed() {
return consumed;
}
/*
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* 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();
}
/*
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* 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;
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Returns a string representing the state of this <code>Event.
* This method is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not be
* <code>null.
*
* @return 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;
}
/**
* <b>NOTE: The Event class is obsolete and is
* available only for backwards compatibility. It has been replaced
* by the <code>AWTEvent class and its subclasses.
* <p>
* Returns a representation of this event's values as a string.
* @return a string that represents the event and the values
* of its member fields.
* @see java.awt.Event#paramString
* @since JDK1.1
*/
public String toString() {
return getClass().getName() + "[" + paramString() + "]";
}
}
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