Java example source code file (AWTEvent.java)
The AWTEvent.java Java example source code/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* 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.
*
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*/
package java.awt;
import java.util.EventObject;
import java.awt.event.*;
import java.awt.peer.ComponentPeer;
import java.awt.peer.LightweightPeer;
import java.lang.reflect.Field;
import sun.awt.AWTAccessor;
import sun.util.logging.PlatformLogger;
import java.security.AccessControlContext;
import java.security.AccessController;
/**
* The root event class for all AWT events.
* This class and its subclasses supercede the original
* java.awt.Event class.
* Subclasses of this root AWTEvent class defined outside of the
* java.awt.event package should define event ID values greater than
* the value defined by RESERVED_ID_MAX.
* <p>
* The event masks defined in this class are needed by Component subclasses
* which are using Component.enableEvents() to select for event types not
* selected by registered listeners. If a listener is registered on a
* component, the appropriate event mask is already set internally by the
* component.
* <p>
* The masks are also used to specify to which types of events an
* AWTEventListener should listen. The masks are bitwise-ORed together
* and passed to Toolkit.addAWTEventListener.
*
* @see Component#enableEvents
* @see Toolkit#addAWTEventListener
*
* @see java.awt.event.ActionEvent
* @see java.awt.event.AdjustmentEvent
* @see java.awt.event.ComponentEvent
* @see java.awt.event.ContainerEvent
* @see java.awt.event.FocusEvent
* @see java.awt.event.InputMethodEvent
* @see java.awt.event.InvocationEvent
* @see java.awt.event.ItemEvent
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.KeyEvent
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseWheelEvent
* @see java.awt.event.PaintEvent
* @see java.awt.event.TextEvent
* @see java.awt.event.WindowEvent
*
* @author Carl Quinn
* @author Amy Fowler
* @since 1.1
*/
public abstract class AWTEvent extends EventObject {
private static final PlatformLogger log = PlatformLogger.getLogger("java.awt.AWTEvent");
private byte bdata[];
/**
* The event's id.
* @serial
* @see #getID()
* @see #AWTEvent
*/
protected int id;
/**
* Controls whether or not the event is sent back down to the peer once the
* source has processed it - false means it's sent to the peer; true means
* it's not. Semantic events always have a 'true' value since they were
* generated by the peer in response to a low-level event.
* @serial
* @see #consume
* @see #isConsumed
*/
protected boolean consumed = false;
/*
* The event's AccessControlContext.
*/
private transient volatile AccessControlContext acc =
AccessController.getContext();
/*
* Returns the acc this event was constructed with.
*/
final AccessControlContext getAccessControlContext() {
if (acc == null) {
throw new SecurityException("AWTEvent is missing AccessControlContext");
}
return acc;
}
transient boolean focusManagerIsDispatching = false;
transient boolean isPosted;
/**
* Indicates whether this AWTEvent was generated by the system as
* opposed to by user code.
*/
private transient boolean isSystemGenerated;
/**
* The event mask for selecting component events.
*/
public final static long COMPONENT_EVENT_MASK = 0x01;
/**
* The event mask for selecting container events.
*/
public final static long CONTAINER_EVENT_MASK = 0x02;
/**
* The event mask for selecting focus events.
*/
public final static long FOCUS_EVENT_MASK = 0x04;
/**
* The event mask for selecting key events.
*/
public final static long KEY_EVENT_MASK = 0x08;
/**
* The event mask for selecting mouse events.
*/
public final static long MOUSE_EVENT_MASK = 0x10;
/**
* The event mask for selecting mouse motion events.
*/
public final static long MOUSE_MOTION_EVENT_MASK = 0x20;
/**
* The event mask for selecting window events.
*/
public final static long WINDOW_EVENT_MASK = 0x40;
/**
* The event mask for selecting action events.
*/
public final static long ACTION_EVENT_MASK = 0x80;
/**
* The event mask for selecting adjustment events.
*/
public final static long ADJUSTMENT_EVENT_MASK = 0x100;
/**
* The event mask for selecting item events.
*/
public final static long ITEM_EVENT_MASK = 0x200;
/**
* The event mask for selecting text events.
*/
public final static long TEXT_EVENT_MASK = 0x400;
/**
* The event mask for selecting input method events.
*/
public final static long INPUT_METHOD_EVENT_MASK = 0x800;
/**
* The pseudo event mask for enabling input methods.
* We're using one bit in the eventMask so we don't need
* a separate field inputMethodsEnabled.
*/
final static long INPUT_METHODS_ENABLED_MASK = 0x1000;
/**
* The event mask for selecting paint events.
*/
public final static long PAINT_EVENT_MASK = 0x2000;
/**
* The event mask for selecting invocation events.
*/
public final static long INVOCATION_EVENT_MASK = 0x4000;
/**
* The event mask for selecting hierarchy events.
*/
public final static long HIERARCHY_EVENT_MASK = 0x8000;
/**
* The event mask for selecting hierarchy bounds events.
*/
public final static long HIERARCHY_BOUNDS_EVENT_MASK = 0x10000;
/**
* The event mask for selecting mouse wheel events.
* @since 1.4
*/
public final static long MOUSE_WHEEL_EVENT_MASK = 0x20000;
/**
* The event mask for selecting window state events.
* @since 1.4
*/
public final static long WINDOW_STATE_EVENT_MASK = 0x40000;
/**
* The event mask for selecting window focus events.
* @since 1.4
*/
public final static long WINDOW_FOCUS_EVENT_MASK = 0x80000;
/**
* WARNING: there are more mask defined privately. See
* SunToolkit.GRAB_EVENT_MASK.
*/
/**
* The maximum value for reserved AWT event IDs. Programs defining
* their own event IDs should use IDs greater than this value.
*/
public final static int RESERVED_ID_MAX = 1999;
// security stuff
private static Field inputEvent_CanAccessSystemClipboard_Field = null;
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = -1825314779160409405L;
static {
/* ensure that the necessary native libraries are loaded */
Toolkit.loadLibraries();
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
AWTAccessor.setAWTEventAccessor(
new AWTAccessor.AWTEventAccessor() {
public void setPosted(AWTEvent ev) {
ev.isPosted = true;
}
public void setSystemGenerated(AWTEvent ev) {
ev.isSystemGenerated = true;
}
public boolean isSystemGenerated(AWTEvent ev) {
return ev.isSystemGenerated;
}
public AccessControlContext getAccessControlContext(AWTEvent ev) {
return ev.getAccessControlContext();
}
public byte[] getBData(AWTEvent ev) {
return ev.bdata;
}
public void setBData(AWTEvent ev, byte[] bdata) {
ev.bdata = bdata;
}
});
}
private static synchronized Field get_InputEvent_CanAccessSystemClipboard() {
if (inputEvent_CanAccessSystemClipboard_Field == null) {
inputEvent_CanAccessSystemClipboard_Field =
java.security.AccessController.doPrivileged(
new java.security.PrivilegedAction<Field>() {
public Field run() {
Field field = null;
try {
field = InputEvent.class.
getDeclaredField("canAccessSystemClipboard");
field.setAccessible(true);
return field;
} catch (SecurityException e) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("AWTEvent.get_InputEvent_CanAccessSystemClipboard() got SecurityException ", e);
}
} catch (NoSuchFieldException e) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("AWTEvent.get_InputEvent_CanAccessSystemClipboard() got NoSuchFieldException ", e);
}
}
return null;
}
});
}
return inputEvent_CanAccessSystemClipboard_Field;
}
/**
* Initialize JNI field and method IDs for fields that may be
* accessed from C.
*/
private static native void initIDs();
/**
* Constructs an AWTEvent object from the parameters of a 1.0-style event.
* @param event the old-style event
*/
public AWTEvent(Event event) {
this(event.target, event.id);
}
/**
* Constructs an AWTEvent object with the specified source object and type.
*
* @param source the object where the event originated
* @param id the event type
*/
public AWTEvent(Object source, int id) {
super(source);
this.id = id;
switch(id) {
case ActionEvent.ACTION_PERFORMED:
case ItemEvent.ITEM_STATE_CHANGED:
case AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED:
case TextEvent.TEXT_VALUE_CHANGED:
consumed = true;
break;
default:
}
}
/**
* Retargets an event to a new source. This method is typically used to
* retarget an event to a lightweight child Component of the original
* heavyweight source.
* <p>
* This method is intended to be used only by event targeting subsystems,
* such as client-defined KeyboardFocusManagers. It is not for general
* client use.
*
* @param newSource the new Object to which the event should be dispatched
* @since 1.4
*/
public void setSource(Object newSource) {
if (source == newSource) {
return;
}
Component comp = null;
if (newSource instanceof Component) {
comp = (Component)newSource;
while (comp != null && comp.peer != null &&
(comp.peer instanceof LightweightPeer)) {
comp = comp.parent;
}
}
synchronized (this) {
source = newSource;
if (comp != null) {
ComponentPeer peer = comp.peer;
if (peer != null) {
nativeSetSource(peer);
}
}
}
}
private native void nativeSetSource(ComponentPeer peer);
/**
* Returns the event type.
*/
public int getID() {
return id;
}
/**
* Returns a String representation of this object.
*/
public String toString() {
String srcName = null;
if (source instanceof Component) {
srcName = ((Component)source).getName();
} else if (source instanceof MenuComponent) {
srcName = ((MenuComponent)source).getName();
}
return getClass().getName() + "[" + paramString() + "] on " +
(srcName != null? srcName : source);
}
/**
* 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 a string representation of this event
*/
public String paramString() {
return "";
}
/**
* Consumes this event, if this event can be consumed. Only low-level,
* system events can be consumed
*/
protected void consume() {
switch(id) {
case KeyEvent.KEY_PRESSED:
case KeyEvent.KEY_RELEASED:
case MouseEvent.MOUSE_PRESSED:
case MouseEvent.MOUSE_RELEASED:
case MouseEvent.MOUSE_MOVED:
case MouseEvent.MOUSE_DRAGGED:
case MouseEvent.MOUSE_ENTERED:
case MouseEvent.MOUSE_EXITED:
case MouseEvent.MOUSE_WHEEL:
case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
case InputMethodEvent.CARET_POSITION_CHANGED:
consumed = true;
break;
default:
// event type cannot be consumed
}
}
/**
* Returns whether this event has been consumed.
*/
protected boolean isConsumed() {
return consumed;
}
/**
* Converts a new event to an old one (used for compatibility).
* If the new event cannot be converted (because no old equivalent
* exists) then this returns null.
*
* Note: this method is here instead of in each individual new
* event class in java.awt.event because we don't want to make
* it public and it needs to be called from java.awt.
*/
Event convertToOld() {
Object src = getSource();
int newid = id;
switch(id) {
case KeyEvent.KEY_PRESSED:
case KeyEvent.KEY_RELEASED:
KeyEvent ke = (KeyEvent)this;
if (ke.isActionKey()) {
newid = (id == KeyEvent.KEY_PRESSED?
Event.KEY_ACTION : Event.KEY_ACTION_RELEASE);
}
int keyCode = ke.getKeyCode();
if (keyCode == KeyEvent.VK_SHIFT ||
keyCode == KeyEvent.VK_CONTROL ||
keyCode == KeyEvent.VK_ALT) {
return null; // suppress modifier keys in old event model.
}
// no mask for button1 existed in old Event - strip it out
return new Event(src, ke.getWhen(), newid, 0, 0,
Event.getOldEventKey(ke),
(ke.getModifiers() & ~InputEvent.BUTTON1_MASK));
case MouseEvent.MOUSE_PRESSED:
case MouseEvent.MOUSE_RELEASED:
case MouseEvent.MOUSE_MOVED:
case MouseEvent.MOUSE_DRAGGED:
case MouseEvent.MOUSE_ENTERED:
case MouseEvent.MOUSE_EXITED:
MouseEvent me = (MouseEvent)this;
// no mask for button1 existed in old Event - strip it out
Event olde = new Event(src, me.getWhen(), newid,
me.getX(), me.getY(), 0,
(me.getModifiers() & ~InputEvent.BUTTON1_MASK));
olde.clickCount = me.getClickCount();
return olde;
case FocusEvent.FOCUS_GAINED:
return new Event(src, Event.GOT_FOCUS, null);
case FocusEvent.FOCUS_LOST:
return new Event(src, Event.LOST_FOCUS, null);
case WindowEvent.WINDOW_CLOSING:
case WindowEvent.WINDOW_ICONIFIED:
case WindowEvent.WINDOW_DEICONIFIED:
return new Event(src, newid, null);
case ComponentEvent.COMPONENT_MOVED:
if (src instanceof Frame || src instanceof Dialog) {
Point p = ((Component)src).getLocation();
return new Event(src, 0, Event.WINDOW_MOVED, p.x, p.y, 0, 0);
}
break;
case ActionEvent.ACTION_PERFORMED:
ActionEvent ae = (ActionEvent)this;
String cmd;
if (src instanceof Button) {
cmd = ((Button)src).getLabel();
} else if (src instanceof MenuItem) {
cmd = ((MenuItem)src).getLabel();
} else {
cmd = ae.getActionCommand();
}
return new Event(src, 0, newid, 0, 0, 0, ae.getModifiers(), cmd);
case ItemEvent.ITEM_STATE_CHANGED:
ItemEvent ie = (ItemEvent)this;
Object arg;
if (src instanceof List) {
newid = (ie.getStateChange() == ItemEvent.SELECTED?
Event.LIST_SELECT : Event.LIST_DESELECT);
arg = ie.getItem();
} else {
newid = Event.ACTION_EVENT;
if (src instanceof Choice) {
arg = ie.getItem();
} else { // Checkbox
arg = Boolean.valueOf(ie.getStateChange() == ItemEvent.SELECTED);
}
}
return new Event(src, newid, arg);
case AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED:
AdjustmentEvent aje = (AdjustmentEvent)this;
switch(aje.getAdjustmentType()) {
case AdjustmentEvent.UNIT_INCREMENT:
newid = Event.SCROLL_LINE_DOWN;
break;
case AdjustmentEvent.UNIT_DECREMENT:
newid = Event.SCROLL_LINE_UP;
break;
case AdjustmentEvent.BLOCK_INCREMENT:
newid = Event.SCROLL_PAGE_DOWN;
break;
case AdjustmentEvent.BLOCK_DECREMENT:
newid = Event.SCROLL_PAGE_UP;
break;
case AdjustmentEvent.TRACK:
if (aje.getValueIsAdjusting()) {
newid = Event.SCROLL_ABSOLUTE;
}
else {
newid = Event.SCROLL_END;
}
break;
default:
return null;
}
return new Event(src, newid, Integer.valueOf(aje.getValue()));
default:
}
return null;
}
/**
* Copies all private data from this event into that.
* Space is allocated for the copied data that will be
* freed when the that is finalized. Upon completion,
* this event is not changed.
*/
void copyPrivateDataInto(AWTEvent that) {
that.bdata = this.bdata;
// Copy canAccessSystemClipboard value from this into that.
if (this instanceof InputEvent && that instanceof InputEvent) {
Field field = get_InputEvent_CanAccessSystemClipboard();
if (field != null) {
try {
boolean b = field.getBoolean(this);
field.setBoolean(that, b);
} catch(IllegalAccessException e) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("AWTEvent.copyPrivateDataInto() got IllegalAccessException ", e);
}
}
}
}
that.isSystemGenerated = this.isSystemGenerated;
}
void dispatched() {
if (this instanceof InputEvent) {
Field field = get_InputEvent_CanAccessSystemClipboard();
if (field != null) {
try {
field.setBoolean(this, false);
} catch(IllegalAccessException e) {
if (log.isLoggable(PlatformLogger.Level.FINE)) {
log.fine("AWTEvent.dispatched() got IllegalAccessException ", e);
}
}
}
}
}
} // class AWTEvent
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