1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.awt;
27
28 import java.awt.*;
29 import static java.awt.RenderingHints.*;
30 import java.awt.dnd.*;
31 import java.awt.dnd.peer.DragSourceContextPeer;
32 import java.awt.peer.*;
33 import java.awt.event.WindowEvent;
34 import java.awt.event.KeyEvent;
35 import java.awt.image.*;
36 import java.awt.TrayIcon;
37 import java.awt.SystemTray;
38 import java.awt.event.InputEvent;
39 import java.net.URL;
40 import java.util.*;
41 import java.util.concurrent.TimeUnit;
42 import java.util.concurrent.locks.Condition;
43 import java.util.concurrent.locks.Lock;
44 import java.util.concurrent.locks.ReentrantLock;
45 import sun.util.logging.PlatformLogger;
46 import sun.misc.SoftCache;
47 import sun.font.FontDesignMetrics;
48 import sun.awt.im.InputContext;
49 import sun.awt.image.*;
50 import sun.security.action.GetPropertyAction;
51 import sun.security.action.GetBooleanAction;
52 import java.lang.reflect.Field;
53 import java.lang.reflect.Method;
54 import java.lang.reflect.Constructor;
55 import java.lang.reflect.InvocationTargetException;
56 import java.security.AccessController;
57 import java.security.PrivilegedAction;
58 import java.security.PrivilegedActionException;
59 import java.security.PrivilegedExceptionAction;
60
61 public abstract class SunToolkit extends Toolkit
62 implements WindowClosingSupport, WindowClosingListener,
63 ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
64
65 private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.SunToolkit");
66
67 /* Load debug settings for native code */
68 static {
69 if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
70 DebugSettings.init();
71 }
72 };
73
74 /**
75 * Special mask for the UngrabEvent events, in addition to the
76 * public masks defined in AWTEvent. Should be used as the mask
77 * value for Toolkit.addAWTEventListener.
78 */
79 public static final int GRAB_EVENT_MASK = 0x80000000;
80
81 private static Method wakeupMethod;
82 /* The key to put()/get() the PostEventQueue into/from the AppContext.
83 */
84 private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
85
86 /**
87 * Number of buttons.
88 * By default it's taken from the system. If system value does not
89 * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
90 */
91 protected static int numberOfButtons = 0;
92
93
94 /* XFree standard mention 24 buttons as maximum:
95 * http://www.xfree86.org/current/mouse.4.html
96 * We workaround systems supporting more than 24 buttons.
97 * Otherwise, we have to use long type values as masks
98 * which leads to API change.
99 * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
100 * the 4-bytes limit for the int type. (CR 6799099)
101 * One more bit is reserved for FIRST_HIGH_BIT.
102 */
103 public final static int MAX_BUTTONS_SUPPORTED = 20;
104
105 private static void initEQ(AppContext appContext) {
106 EventQueue eventQueue;
107
108 String eqName = System.getProperty("AWT.EventQueueClass",
109 "java.awt.EventQueue");
110
111 try {
112 eventQueue = (EventQueue)Class.forName(eqName).newInstance();
113 } catch (Exception e) {
114 e.printStackTrace();
115 System.err.println("Failed loading " + eqName + ": " + e);
116 eventQueue = new EventQueue();
117 }
118 appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
119
120 PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
121 appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
122 }
123
124 public SunToolkit() {
125 // 7122796: Always create an EQ for the main AppContext
126 initEQ(AppContext.getMainAppContext());
127 }
128
129 public boolean useBufferPerWindow() {
130 return false;
131 }
132
133 public abstract WindowPeer createWindow(Window target)
134 throws HeadlessException;
135
136 public abstract FramePeer createFrame(Frame target)
137 throws HeadlessException;
138
139 public abstract DialogPeer createDialog(Dialog target)
140 throws HeadlessException;
141
142 public abstract ButtonPeer createButton(Button target)
143 throws HeadlessException;
144
145 public abstract TextFieldPeer createTextField(TextField target)
146 throws HeadlessException;
147
148 public abstract ChoicePeer createChoice(Choice target)
149 throws HeadlessException;
150
151 public abstract LabelPeer createLabel(Label target)
152 throws HeadlessException;
153
154 public abstract ListPeer createList(java.awt.List target)
155 throws HeadlessException;
156
157 public abstract CheckboxPeer createCheckbox(Checkbox target)
158 throws HeadlessException;
159
160 public abstract ScrollbarPeer createScrollbar(Scrollbar target)
161 throws HeadlessException;
162
163 public abstract ScrollPanePeer createScrollPane(ScrollPane target)
164 throws HeadlessException;
165
166 public abstract TextAreaPeer createTextArea(TextArea target)
167 throws HeadlessException;
168
169 public abstract FileDialogPeer createFileDialog(FileDialog target)
170 throws HeadlessException;
171
172 public abstract MenuBarPeer createMenuBar(MenuBar target)
173 throws HeadlessException;
174
175 public abstract MenuPeer createMenu(Menu target)
176 throws HeadlessException;
177
178 public abstract PopupMenuPeer createPopupMenu(PopupMenu target)
179 throws HeadlessException;
180
181 public abstract MenuItemPeer createMenuItem(MenuItem target)
182 throws HeadlessException;
183
184 public abstract CheckboxMenuItemPeer createCheckboxMenuItem(
185 CheckboxMenuItem target)
186 throws HeadlessException;
187
188 public abstract DragSourceContextPeer createDragSourceContextPeer(
189 DragGestureEvent dge)
190 throws InvalidDnDOperationException;
191
192 public abstract TrayIconPeer createTrayIcon(TrayIcon target)
193 throws HeadlessException, AWTException;
194
195 public abstract SystemTrayPeer createSystemTray(SystemTray target);
196
197 public abstract boolean isTraySupported();
198
199 public abstract FontPeer getFontPeer(String name, int style);
200
201 public abstract RobotPeer createRobot(Robot target, GraphicsDevice screen)
202 throws AWTException;
203
204 public abstract KeyboardFocusManagerPeer createKeyboardFocusManagerPeer(KeyboardFocusManager manager)
205 throws HeadlessException;
206
207 /**
208 * The AWT lock is typically only used on Unix platforms to synchronize
209 * access to Xlib, OpenGL, etc. However, these methods are implemented
210 * in SunToolkit so that they can be called from shared code (e.g.
211 * from the OGL pipeline) or from the X11 pipeline regardless of whether
212 * XToolkit or MToolkit is currently in use. There are native macros
213 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
214 * methods is changed, make sure it is compatible with the native macros.
215 *
216 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
217 * used in place of:
218 * synchronized (getAWTLock()) {
219 * ...
220 * }
221 *
222 * By factoring these methods out specially, we are able to change the
223 * implementation of these methods (e.g. use more advanced locking
224 * mechanisms) without impacting calling code.
225 *
226 * Sample usage:
227 * private void doStuffWithXlib() {
228 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
229 * SunToolkit.awtLock();
230 * try {
231 * ...
232 * XlibWrapper.XDoStuff();
233 * } finally {
234 * SunToolkit.awtUnlock();
235 * }
236 * }
237 */
238
239 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
240 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
241
242 public static final void awtLock() {
243 AWT_LOCK.lock();
244 }
245
246 public static final boolean awtTryLock() {
247 return AWT_LOCK.tryLock();
248 }
249
250 public static final void awtUnlock() {
251 AWT_LOCK.unlock();
252 }
253
254 public static final void awtLockWait()
255 throws InterruptedException
256 {
257 AWT_LOCK_COND.await();
258 }
259
260 public static final void awtLockWait(long timeout)
261 throws InterruptedException
262 {
263 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
264 }
265
266 public static final void awtLockNotify() {
267 AWT_LOCK_COND.signal();
268 }
269
270 public static final void awtLockNotifyAll() {
271 AWT_LOCK_COND.signalAll();
272 }
273
274 public static final boolean isAWTLockHeldByCurrentThread() {
275 return AWT_LOCK.isHeldByCurrentThread();
276 }
277
278 /*
279 * Create a new AppContext, along with its EventQueue, for a
280 * new ThreadGroup. Browser code, for example, would use this
281 * method to create an AppContext & EventQueue for an Applet.
282 */
283 public static AppContext createNewAppContext() {
284 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
285 // Create appContext before initialization of EventQueue, so all
286 // the calls to AppContext.getAppContext() from EventQueue ctor
287 // return correct values
288 AppContext appContext = new AppContext(threadGroup);
289
290 initEQ(appContext);
291
292 return appContext;
293 }
294
295 public static Field getField(final Class klass, final String fieldName) {
296 return AccessController.doPrivileged(new PrivilegedAction<Field>() {
297 public Field run() {
298 try {
299 Field field = klass.getDeclaredField(fieldName);
300 assert (field != null);
301 field.setAccessible(true);
302 return field;
303 } catch (SecurityException e) {
304 assert false;
305 } catch (NoSuchFieldException e) {
306 assert false;
307 }
308 return null;
309 }//run
310 });
311 }
312
313 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
314 if (wakeupMethod == null){
315 wakeupMethod = (Method)AccessController.doPrivileged(new PrivilegedAction(){
316 public Object run(){
317 try {
318 Method method = EventQueue.class.getDeclaredMethod("wakeup",new Class [] {Boolean.TYPE} );
319 if (method != null) {
320 method.setAccessible(true);
321 }
322 return method;
323 } catch (NoSuchMethodException e) {
324 assert false;
325 } catch (SecurityException e) {
326 assert false;
327 }
328 return null;
329 }//run
330 });
331 }
332 try{
333 if (wakeupMethod != null){
334 wakeupMethod.invoke(q, new Object[]{Boolean.valueOf(isShutdown)});
335 }
336 } catch (InvocationTargetException e){
337 assert false;
338 } catch (IllegalAccessException e) {
339 assert false;
340 }
341 }
342
343 /*
344 * Fetch the peer associated with the given target (as specified
345 * in the peer creation method). This can be used to determine
346 * things like what the parent peer is. If the target is null
347 * or the target can't be found (either because the a peer was
348 * never created for it or the peer was disposed), a null will
349 * be returned.
350 */
351 protected static Object targetToPeer(Object target) {
352 if (target != null && !GraphicsEnvironment.isHeadless()) {
353 return AWTAutoShutdown.getInstance().getPeer(target);
354 }
355 return null;
356 }
357
358 protected static void targetCreatedPeer(Object target, Object peer) {
359 if (target != null && peer != null &&
360 !GraphicsEnvironment.isHeadless())
361 {
362 AWTAutoShutdown.getInstance().registerPeer(target, peer);
363 }
364 }
365
366 protected static void targetDisposedPeer(Object target, Object peer) {
367 if (target != null && peer != null &&
368 !GraphicsEnvironment.isHeadless())
369 {
370 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
371 }
372 }
373
374 // Maps from non-Component/MenuComponent to AppContext.
375 // WeakHashMap<Component,AppContext>
376 private static final Map appContextMap =
377 Collections.synchronizedMap(new WeakHashMap());
378
379 /**
380 * Sets the appContext field of target. If target is not a Component or
381 * MenuComponent, this returns false.
382 */
383 private static boolean setAppContext(Object target,
384 AppContext context) {
385 if (target instanceof Component) {
386 AWTAccessor.getComponentAccessor().
387 setAppContext((Component)target, context);
388 } else if (target instanceof MenuComponent) {
389 AWTAccessor.getMenuComponentAccessor().
390 setAppContext((MenuComponent)target, context);
391 } else {
392 return false;
393 }
394 return true;
395 }
396
397 /**
398 * Returns the appContext field for target. If target is not a
399 * Component or MenuComponent this returns null.
400 */
401 private static AppContext getAppContext(Object target) {
402 if (target instanceof Component) {
403 return AWTAccessor.getComponentAccessor().
404 getAppContext((Component)target);
405 } else if (target instanceof MenuComponent) {
406 return AWTAccessor.getMenuComponentAccessor().
407 getAppContext((MenuComponent)target);
408 } else {
409 return null;
410 }
411 }
412
413 /*
414 * Fetch the AppContext associated with the given target.
415 * This can be used to determine things like which EventQueue
416 * to use for posting events to a Component. If the target is
417 * null or the target can't be found, a null with be returned.
418 */
419 public static AppContext targetToAppContext(Object target) {
420 if (target == null || GraphicsEnvironment.isHeadless()) {
421 return null;
422 }
423 AppContext context = getAppContext(target);
424 if (context == null) {
425 // target is not a Component/MenuComponent, try the
426 // appContextMap.
427 context = (AppContext)appContextMap.get(target);
428 }
429 return context;
430 }
431
432 /**
433 * Sets the synchronous status of focus requests on lightweight
434 * components in the specified window to the specified value.
435 * If the boolean parameter is <code>true</code> then the focus
436 * requests on lightweight components will be performed
437 * synchronously, if it is <code>false</code>, then asynchronously.
438 * By default, all windows have their lightweight request status
439 * set to asynchronous.
440 * <p>
441 * The application can only set the status of lightweight focus
442 * requests to synchronous for any of its windows if it doesn't
443 * perform focus transfers between different heavyweight containers.
444 * In this case the observable focus behaviour is the same as with
445 * asynchronous status.
446 * <p>
447 * If the application performs focus transfer between different
448 * heavyweight containers and sets the lightweight focus request
449 * status to synchronous for any of its windows, then further focus
450 * behaviour is unspecified.
451 * <p>
452 * @param w window for which the lightweight focus request status
453 * should be set
454 * @param status the value of lightweight focus request status
455 */
456
457 public static void setLWRequestStatus(Window changed,boolean status){
458 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
459 };
460
461 public static void checkAndSetPolicy(Container cont) {
462 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
463 getCurrentKeyboardFocusManager().
464 getDefaultFocusTraversalPolicy();
465
466 cont.setFocusTraversalPolicy(defaultPolicy);
467 }
468
469 private static FocusTraversalPolicy createLayoutPolicy() {
470 FocusTraversalPolicy policy = null;
471 try {
472 Class layoutPolicyClass =
473 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
474 policy = (FocusTraversalPolicy) layoutPolicyClass.newInstance();
475 }
476 catch (ClassNotFoundException e) {
477 assert false;
478 }
479 catch (InstantiationException e) {
480 assert false;
481 }
482 catch (IllegalAccessException e) {
483 assert false;
484 }
485
486 return policy;
487 }
488
489 /*
490 * Insert a mapping from target to AppContext, for later retrieval
491 * via targetToAppContext() above.
492 */
493 public static void insertTargetMapping(Object target, AppContext appContext) {
494 if (!GraphicsEnvironment.isHeadless()) {
495 if (!setAppContext(target, appContext)) {
496 // Target is not a Component/MenuComponent, use the private Map
497 // instead.
498 appContextMap.put(target, appContext);
499 }
500 }
501 }
502
503 /*
504 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
505 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
506 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
507 * not be called under another lock since it locks the EventQueue.
508 * See bugids 4632918, 4526597.
509 */
510 public static void postEvent(AppContext appContext, AWTEvent event) {
511 if (event == null) {
512 throw new NullPointerException();
513 }
514 // All events posted via this method are system-generated.
515 // Placing the following call here reduces considerably the
516 // number of places throughout the toolkit that would
517 // otherwise have to be modified to precisely identify
518 // system-generated events.
519 setSystemGenerated(event);
520 AppContext eventContext = targetToAppContext(event.getSource());
521 if (eventContext != null && !eventContext.equals(appContext)) {
522 log.fine("Event posted on wrong app context : " + event);
523 }
524 PostEventQueue postEventQueue =
525 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
526 if (postEventQueue != null) {
527 postEventQueue.postEvent(event);
528 }
529 }
530
531 /*
532 * Post AWTEvent of high priority.
533 */
534 public static void postPriorityEvent(final AWTEvent e) {
535 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
536 public void run() {
537 AWTAccessor.getAWTEventAccessor().setPosted(e);
538 ((Component)e.getSource()).dispatchEvent(e);
539 }
540 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
541 postEvent(targetToAppContext(e.getSource()), pe);
542 }
543
544 protected static final Lock flushLock = new ReentrantLock();
545 private static boolean isFlushingPendingEvents = false;
546
547 /*
548 * Flush any pending events which haven't been posted to the AWT
549 * EventQueue yet.
550 */
551 public static void flushPendingEvents() {
552 flushLock.lock();
553 try {
554 // Don't call flushPendingEvents() recursively
555 if (!isFlushingPendingEvents) {
556 isFlushingPendingEvents = true;
557 AppContext appContext = AppContext.getAppContext();
558 PostEventQueue postEventQueue =
559 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
560 if (postEventQueue != null) {
561 postEventQueue.flush();
562 }
563 }
564 } finally {
565 isFlushingPendingEvents = false;
566 flushLock.unlock();
567 }
568 }
569
570 public static boolean isPostEventQueueEmpty() {
571 AppContext appContext = AppContext.getAppContext();
572 PostEventQueue postEventQueue =
573 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
574 if (postEventQueue != null) {
575 return postEventQueue.noEvents();
576 } else {
577 return true;
578 }
579 }
580
581 /*
582 * Execute a chunk of code on the Java event handler thread for the
583 * given target. Does not wait for the execution to occur before
584 * returning to the caller.
585 */
586 public static void executeOnEventHandlerThread(Object target,
587 Runnable runnable) {
588 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
589 }
590
591 /*
592 * Fixed 5064013: the InvocationEvent time should be equals
593 * the time of the ActionEvent
594 */
595 public static void executeOnEventHandlerThread(Object target,
596 Runnable runnable,
597 final long when) {
598 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT){
599 public long getWhen(){
600 return when;
601 }
602 });
603 }
604
605 /*
606 * Execute a chunk of code on the Java event handler thread for the
607 * given target. Does not wait for the execution to occur before
608 * returning to the caller.
609 */
610 public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
611 postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
612 }
613
614 /*
615 * Execute a chunk of code on the Java event handler thread. The
616 * method takes into account provided AppContext and sets
617 * <code>SunToolkit.getDefaultToolkit()</code> as a target of the
618 * event. See 6451487 for detailes.
619 * Does not wait for the execution to occur before returning to
620 * the caller.
621 */
622 public static void invokeLaterOnAppContext(
623 AppContext appContext, Runnable dispatcher)
624 {
625 postEvent(appContext,
626 new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
627 PeerEvent.PRIORITY_EVENT));
628 }
629
630 /*
631 * Execute a chunk of code on the Java event handler thread for the
632 * given target. Waits for the execution to occur before returning
633 * to the caller.
634 */
635 public static void executeOnEDTAndWait(Object target, Runnable runnable)
636 throws InterruptedException, InvocationTargetException
637 {
638 if (EventQueue.isDispatchThread()) {
639 throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
640 }
641
642 class AWTInvocationLock {}
643 Object lock = new AWTInvocationLock();
644
645 PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
646
647 synchronized (lock) {
648 executeOnEventHandlerThread(event);
649 while(!event.isDispatched()) {
650 lock.wait();
651 }
652 }
653
654 Throwable eventThrowable = event.getThrowable();
655 if (eventThrowable != null) {
656 throw new InvocationTargetException(eventThrowable);
657 }
658 }
659
660 /*
661 * Returns true if the calling thread is the event dispatch thread
662 * contained within AppContext which associated with the given target.
663 * Use this call to ensure that a given task is being executed
664 * (or not being) on the event dispatch thread for the given target.
665 */
666 public static boolean isDispatchThreadForAppContext(Object target) {
667 AppContext appContext = targetToAppContext(target);
668 EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
669
670 AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
671 return accessor.isDispatchThreadImpl(eq);
672 }
673
674 public Dimension getScreenSize() {
675 return new Dimension(getScreenWidth(), getScreenHeight());
676 }
677 protected abstract int getScreenWidth();
678 protected abstract int getScreenHeight();
679
680 public FontMetrics getFontMetrics(Font font) {
681 return FontDesignMetrics.getMetrics(font);
682 }
683
684 public String[] getFontList() {
685 String[] hardwiredFontList = {
686 Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
687 Font.DIALOG_INPUT
688
689 // -- Obsolete font names from 1.0.2. It was decided that
690 // -- getFontList should not return these old names:
691 // "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
692 };
693 return hardwiredFontList;
694 }
695
696 public PanelPeer createPanel(Panel target) {
697 return (PanelPeer)createComponent(target);
698 }
699
700 public CanvasPeer createCanvas(Canvas target) {
701 return (CanvasPeer)createComponent(target);
702 }
703
704 /**
705 * Disables erasing of background on the canvas before painting if
706 * this is supported by the current toolkit. It is recommended to
707 * call this method early, before the Canvas becomes displayable,
708 * because some Toolkit implementations do not support changing
709 * this property once the Canvas becomes displayable.
710 */
711 public void disableBackgroundErase(Canvas canvas) {
712 disableBackgroundEraseImpl(canvas);
713 }
714
715 /**
716 * Disables the native erasing of the background on the given
717 * component before painting if this is supported by the current
718 * toolkit. This only has an effect for certain components such as
719 * Canvas, Panel and Window. It is recommended to call this method
720 * early, before the Component becomes displayable, because some
721 * Toolkit implementations do not support changing this property
722 * once the Component becomes displayable.
723 */
724 public void disableBackgroundErase(Component component) {
725 disableBackgroundEraseImpl(component);
726 }
727
728 private void disableBackgroundEraseImpl(Component component) {
729 AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
730 }
731
732 /**
733 * Returns the value of "sun.awt.noerasebackground" property. Default
734 * value is {@code false}.
735 */
736 public static boolean getSunAwtNoerasebackground() {
737 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
738 }
739
740 /**
741 * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
742 * value is {@code false}.
743 */
744 public static boolean getSunAwtErasebackgroundonresize() {
745 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
746 }
747
748
749 static final SoftCache imgCache = new SoftCache();
750
751 static Image getImageFromHash(Toolkit tk, URL url) {
752 SecurityManager sm = System.getSecurityManager();
753 if (sm != null) {
754 try {
755 java.security.Permission perm =
756 url.openConnection().getPermission();
757 if (perm != null) {
758 try {
759 sm.checkPermission(perm);
760 } catch (SecurityException se) {
761 // fallback to checkRead/checkConnect for pre 1.2
762 // security managers
763 if ((perm instanceof java.io.FilePermission) &&
764 perm.getActions().indexOf("read") != -1) {
765 sm.checkRead(perm.getName());
766 } else if ((perm instanceof
767 java.net.SocketPermission) &&
768 perm.getActions().indexOf("connect") != -1) {
769 sm.checkConnect(url.getHost(), url.getPort());
770 } else {
771 throw se;
772 }
773 }
774 }
775 } catch (java.io.IOException ioe) {
776 sm.checkConnect(url.getHost(), url.getPort());
777 }
778 }
779 synchronized (imgCache) {
780 Image img = (Image)imgCache.get(url);
781 if (img == null) {
782 try {
783 img = tk.createImage(new URLImageSource(url));
784 imgCache.put(url, img);
785 } catch (Exception e) {
786 }
787 }
788 return img;
789 }
790 }
791
792 static Image getImageFromHash(Toolkit tk,
793 String filename) {
794 SecurityManager security = System.getSecurityManager();
795 if (security != null) {
796 security.checkRead(filename);
797 }
798 synchronized (imgCache) {
799 Image img = (Image)imgCache.get(filename);
800 if (img == null) {
801 try {
802 img = tk.createImage(new FileImageSource(filename));
803 imgCache.put(filename, img);
804 } catch (Exception e) {
805 }
806 }
807 return img;
808 }
809 }
810
811 public Image getImage(String filename) {
812 return getImageFromHash(this, filename);
813 }
814
815 public Image getImage(URL url) {
816 return getImageFromHash(this, url);
817 }
818
819 public Image createImage(String filename) {
820 SecurityManager security = System.getSecurityManager();
821 if (security != null) {
822 security.checkRead(filename);
823 }
824 return createImage(new FileImageSource(filename));
825 }
826
827 public Image createImage(URL url) {
828 SecurityManager sm = System.getSecurityManager();
829 if (sm != null) {
830 try {
831 java.security.Permission perm =
832 url.openConnection().getPermission();
833 if (perm != null) {
834 try {
835 sm.checkPermission(perm);
836 } catch (SecurityException se) {
837 // fallback to checkRead/checkConnect for pre 1.2
838 // security managers
839 if ((perm instanceof java.io.FilePermission) &&
840 perm.getActions().indexOf("read") != -1) {
841 sm.checkRead(perm.getName());
842 } else if ((perm instanceof
843 java.net.SocketPermission) &&
844 perm.getActions().indexOf("connect") != -1) {
845 sm.checkConnect(url.getHost(), url.getPort());
846 } else {
847 throw se;
848 }
849 }
850 }
851 } catch (java.io.IOException ioe) {
852 sm.checkConnect(url.getHost(), url.getPort());
853 }
854 }
855 return createImage(new URLImageSource(url));
856 }
857
858 public Image createImage(byte[] data, int offset, int length) {
859 return createImage(new ByteArrayImageSource(data, offset, length));
860 }
861
862 public Image createImage(ImageProducer producer) {
863 return new ToolkitImage(producer);
864 }
865
866 public int checkImage(Image img, int w, int h, ImageObserver o) {
867 if (!(img instanceof ToolkitImage)) {
868 return ImageObserver.ALLBITS;
869 }
870
871 ToolkitImage tkimg = (ToolkitImage)img;
872 int repbits;
873 if (w == 0 || h == 0) {
874 repbits = ImageObserver.ALLBITS;
875 } else {
876 repbits = tkimg.getImageRep().check(o);
877 }
878 return tkimg.check(o) | repbits;
879 }
880
881 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
882 if (w == 0 || h == 0) {
883 return true;
884 }
885
886 // Must be a ToolkitImage
887 if (!(img instanceof ToolkitImage)) {
888 return true;
889 }
890
891 ToolkitImage tkimg = (ToolkitImage)img;
892 if (tkimg.hasError()) {
893 if (o != null) {
894 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
895 -1, -1, -1, -1);
896 }
897 return false;
898 }
899 ImageRepresentation ir = tkimg.getImageRep();
900 return ir.prepare(o);
901 }
902
903 /**
904 * Scans {@code imageList} for best-looking image of specified dimensions.
905 * Image can be scaled and/or padded with transparency.
906 */
907 public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
908 if (width == 0 || height == 0) {
909 return null;
910 }
911 Image bestImage = null;
912 int bestWidth = 0;
913 int bestHeight = 0;
914 double bestSimilarity = 3; //Impossibly high value
915 double bestScaleFactor = 0;
916 for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
917 //Iterate imageList looking for best matching image.
918 //'Similarity' measure is defined as good scale factor and small insets.
919 //best possible similarity is 0 (no scale, no insets).
920 //It's found while the experiments that good-looking result is achieved
921 //with scale factors x1, x3/4, x2/3, xN, x1/N.
922 Image im = i.next();
923 if (im == null) {
924 if (log.isLoggable(PlatformLogger.FINER)) {
925 log.finer("SunToolkit.getScaledIconImage: " +
926 "Skipping the image passed into Java because it's null.");
927 }
928 continue;
929 }
930 if (im instanceof ToolkitImage) {
931 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
932 ir.reconstruct(ImageObserver.ALLBITS);
933 }
934 int iw;
935 int ih;
936 try {
937 iw = im.getWidth(null);
938 ih = im.getHeight(null);
939 } catch (Exception e){
940 if (log.isLoggable(PlatformLogger.FINER)) {
941 log.finer("SunToolkit.getScaledIconImage: " +
942 "Perhaps the image passed into Java is broken. Skipping this icon.");
943 }
944 continue;
945 }
946 if (iw > 0 && ih > 0) {
947 //Calc scale factor
948 double scaleFactor = Math.min((double)width / (double)iw,
949 (double)height / (double)ih);
950 //Calculate scaled image dimensions
951 //adjusting scale factor to nearest "good" value
952 int adjw = 0;
953 int adjh = 0;
954 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
955 if (scaleFactor >= 2) {
956 //Need to enlarge image more than twice
957 //Round down scale factor to multiply by integer value
958 scaleFactor = Math.floor(scaleFactor);
959 adjw = iw * (int)scaleFactor;
960 adjh = ih * (int)scaleFactor;
961 scaleMeasure = 1.0 - 0.5 / scaleFactor;
962 } else if (scaleFactor >= 1) {
963 //Don't scale
964 scaleFactor = 1.0;
965 adjw = iw;
966 adjh = ih;
967 scaleMeasure = 0;
968 } else if (scaleFactor >= 0.75) {
969 //Multiply by 3/4
970 scaleFactor = 0.75;
971 adjw = iw * 3 / 4;
972 adjh = ih * 3 / 4;
973 scaleMeasure = 0.3;
974 } else if (scaleFactor >= 0.6666) {
975 //Multiply by 2/3
976 scaleFactor = 0.6666;
977 adjw = iw * 2 / 3;
978 adjh = ih * 2 / 3;
979 scaleMeasure = 0.33;
980 } else {
981 //Multiply size by 1/scaleDivider
982 //where scaleDivider is minimum possible integer
983 //larger than 1/scaleFactor
984 double scaleDivider = Math.ceil(1.0 / scaleFactor);
985 scaleFactor = 1.0 / scaleDivider;
986 adjw = (int)Math.round((double)iw / scaleDivider);
987 adjh = (int)Math.round((double)ih / scaleDivider);
988 scaleMeasure = 1.0 - 1.0 / scaleDivider;
989 }
990 double similarity = ((double)width - (double)adjw) / (double)width +
991 ((double)height - (double)adjh) / (double)height + //Large padding is bad
992 scaleMeasure; //Large rescale is bad
993 if (similarity < bestSimilarity) {
994 bestSimilarity = similarity;
995 bestScaleFactor = scaleFactor;
996 bestImage = im;
997 bestWidth = adjw;
998 bestHeight = adjh;
999 }
1000 if (similarity == 0) break;
1001 }
1002 }
1003 if (bestImage == null) {
1004 //No images were found, possibly all are broken
1005 return null;
1006 }
1007 BufferedImage bimage =
1008 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
1009 Graphics2D g = bimage.createGraphics();
1010 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
1011 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
1012 try {
1013 int x = (width - bestWidth) / 2;
1014 int y = (height - bestHeight) / 2;
1015 if (log.isLoggable(PlatformLogger.FINER)) {
1016 log.finer("WWindowPeer.getScaledIconData() result : " +
1017 "w : " + width + " h : " + height +
1018 " iW : " + bestImage.getWidth(null) + " iH : " + bestImage.getHeight(null) +
1019 " sim : " + bestSimilarity + " sf : " + bestScaleFactor +
1020 " adjW : " + bestWidth + " adjH : " + bestHeight +
1021 " x : " + x + " y : " + y);
1022 }
1023 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
1024 } finally {
1025 g.dispose();
1026 }
1027 return bimage;
1028 }
1029
1030 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
1031 BufferedImage bimage = getScaledIconImage(imageList, width, height);
1032 if (bimage == null) {
1033 if (log.isLoggable(PlatformLogger.FINER)) {
1034 log.finer("SunToolkit.getScaledIconData: " +
1035 "Perhaps the image passed into Java is broken. Skipping this icon.");
1036 }
1037 return null;
1038 }
1039 Raster raster = bimage.getRaster();
1040 DataBuffer buffer = raster.getDataBuffer();
1041 return (DataBufferInt)buffer;
1042 }
1043
1044 protected EventQueue getSystemEventQueueImpl() {
1045 return getSystemEventQueueImplPP();
1046 }
1047
1048 // Package private implementation
1049 static EventQueue getSystemEventQueueImplPP() {
1050 return getSystemEventQueueImplPP(AppContext.getAppContext());
1051 }
1052
1053 public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1054 EventQueue theEventQueue =
1055 (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1056 return theEventQueue;
1057 }
1058
1059 /**
1060 * Give native peers the ability to query the native container
1061 * given a native component (eg the direct parent may be lightweight).
1062 */
1063 public static Container getNativeContainer(Component c) {
1064 return Toolkit.getNativeContainer(c);
1065 }
1066
1067 /**
1068 * Gives native peers the ability to query the closest HW component.
1069 * If the given component is heavyweight, then it returns this. Otherwise,
1070 * it goes one level up in the hierarchy and tests next component.
1071 */
1072 public static Component getHeavyweightComponent(Component c) {
1073 while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1074 c = AWTAccessor.getComponentAccessor().getParent(c);
1075 }
1076 return c;
1077 }
1078
1079 /**
1080 * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1081 */
1082 public int getFocusAcceleratorKeyMask() {
1083 return InputEvent.ALT_MASK;
1084 }
1085
1086 /**
1087 * Returns a new input method window, with behavior as specified in
1088 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1089 * If the inputContext is not null, the window should return it from its
1090 * getInputContext() method. The window needs to implement
1091 * sun.awt.im.InputMethodWindow.
1092 * <p>
1093 * SunToolkit subclasses can override this method to return better input
1094 * method windows.
1095 */
1096 public Window createInputMethodWindow(String title, InputContext context) {
1097 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1098 }
1099
1100 /**
1101 * Returns whether enableInputMethods should be set to true for peered
1102 * TextComponent instances on this platform. False by default.
1103 */
1104 public boolean enableInputMethodsForTextComponent() {
1105 return false;
1106 }
1107
1108 private static Locale startupLocale = null;
1109
1110 /**
1111 * Returns the locale in which the runtime was started.
1112 */
1113 public static Locale getStartupLocale() {
1114 if (startupLocale == null) {
1115 String language, region, country, variant;
1116 language = (String) AccessController.doPrivileged(
1117 new GetPropertyAction("user.language", "en"));
1118 // for compatibility, check for old user.region property
1119 region = (String) AccessController.doPrivileged(
1120 new GetPropertyAction("user.region"));
1121 if (region != null) {
1122 // region can be of form country, country_variant, or _variant
1123 int i = region.indexOf('_');
1124 if (i >= 0) {
1125 country = region.substring(0, i);
1126 variant = region.substring(i + 1);
1127 } else {
1128 country = region;
1129 variant = "";
1130 }
1131 } else {
1132 country = (String) AccessController.doPrivileged(
1133 new GetPropertyAction("user.country", ""));
1134 variant = (String) AccessController.doPrivileged(
1135 new GetPropertyAction("user.variant", ""));
1136 }
1137 startupLocale = new Locale(language, country, variant);
1138 }
1139 return startupLocale;
1140 }
1141
1142 /**
1143 * Returns the default keyboard locale of the underlying operating system
1144 */
1145 public Locale getDefaultKeyboardLocale() {
1146 return getStartupLocale();
1147 }
1148
1149 private static String dataTransfererClassName = null;
1150
1151 protected static void setDataTransfererClassName(String className) {
1152 dataTransfererClassName = className;
1153 }
1154
1155 public static String getDataTransfererClassName() {
1156 if (dataTransfererClassName == null) {
1157 Toolkit.getDefaultToolkit(); // transferer set during toolkit init
1158 }
1159 return dataTransfererClassName;
1160 }
1161
1162 // Support for window closing event notifications
1163 private transient WindowClosingListener windowClosingListener = null;
1164 /**
1165 * @see sun.awt.WindowClosingSupport#getWindowClosingListener
1166 */
1167 public WindowClosingListener getWindowClosingListener() {
1168 return windowClosingListener;
1169 }
1170 /**
1171 * @see sun.awt.WindowClosingSupport#setWindowClosingListener
1172 */
1173 public void setWindowClosingListener(WindowClosingListener wcl) {
1174 windowClosingListener = wcl;
1175 }
1176
1177 /**
1178 * @see sun.awt.WindowClosingListener#windowClosingNotify
1179 */
1180 public RuntimeException windowClosingNotify(WindowEvent event) {
1181 if (windowClosingListener != null) {
1182 return windowClosingListener.windowClosingNotify(event);
1183 } else {
1184 return null;
1185 }
1186 }
1187 /**
1188 * @see sun.awt.WindowClosingListener#windowClosingDelivered
1189 */
1190 public RuntimeException windowClosingDelivered(WindowEvent event) {
1191 if (windowClosingListener != null) {
1192 return windowClosingListener.windowClosingDelivered(event);
1193 } else {
1194 return null;
1195 }
1196 }
1197
1198 private static DefaultMouseInfoPeer mPeer = null;
1199
1200 protected synchronized MouseInfoPeer getMouseInfoPeer() {
1201 if (mPeer == null) {
1202 mPeer = new DefaultMouseInfoPeer();
1203 }
1204 return mPeer;
1205 }
1206
1207
1208 /**
1209 * Returns whether default toolkit needs the support of the xembed
1210 * from embedding host(if any).
1211 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1212 */
1213 public static boolean needsXEmbed() {
1214 String noxembed = (String) AccessController.
1215 doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1216 if ("true".equals(noxembed)) {
1217 return false;
1218 }
1219
1220 Toolkit tk = Toolkit.getDefaultToolkit();
1221 if (tk instanceof SunToolkit) {
1222 // SunToolkit descendants should override this method to specify
1223 // concrete behavior
1224 return ((SunToolkit)tk).needsXEmbedImpl();
1225 } else {
1226 // Non-SunToolkit doubtly might support XEmbed
1227 return false;
1228 }
1229 }
1230
1231 /**
1232 * Returns whether this toolkit needs the support of the xembed
1233 * from embedding host(if any).
1234 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1235 */
1236 protected boolean needsXEmbedImpl() {
1237 return false;
1238 }
1239
1240 private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1241
1242 /**
1243 * Returns whether the XEmbed server feature is requested by
1244 * developer. If true, Toolkit should return an
1245 * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1246 */
1247 protected final boolean isXEmbedServerRequested() {
1248 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1249 }
1250
1251 /**
1252 * Returns whether the modal exclusion API is supported by the current toolkit.
1253 * When it isn't supported, calling <code>setModalExcluded</code> has no
1254 * effect, and <code>isModalExcluded</code> returns false for all windows.
1255 *
1256 * @return true if modal exclusion is supported by the toolkit, false otherwise
1257 *
1258 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1259 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1260 *
1261 * @since 1.5
1262 */
1263 public static boolean isModalExcludedSupported()
1264 {
1265 Toolkit tk = Toolkit.getDefaultToolkit();
1266 return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1267 }
1268 /*
1269 * Default implementation for isModalExcludedSupportedImpl(), returns false.
1270 *
1271 * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1272 * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1273 *
1274 * @since 1.5
1275 */
1276 protected boolean isModalExcludedSupportedImpl()
1277 {
1278 return false;
1279 }
1280
1281 /*
1282 * Sets this window to be excluded from being modally blocked. When the
1283 * toolkit supports modal exclusion and this method is called, input
1284 * events, focus transfer and z-order will continue to work for the
1285 * window, it's owned windows and child components, even in the
1286 * presence of a modal dialog.
1287 * For details on which <code>Window</code>s are normally blocked
1288 * by modal dialog, see {@link java.awt.Dialog}.
1289 * Invoking this method when the modal exclusion API is not supported by
1290 * the current toolkit has no effect.
1291 * @param window Window to be marked as not modally blocked
1292 * @see java.awt.Dialog
1293 * @see java.awt.Dialog#setModal(boolean)
1294 * @see sun.awt.SunToolkit#isModalExcludedSupported
1295 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1296 */
1297 public static void setModalExcluded(Window window)
1298 {
1299 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1300 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1301 }
1302 window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1303 }
1304
1305 /*
1306 * Returns whether the specified window is blocked by modal dialogs.
1307 * If the modal exclusion API isn't supported by the current toolkit,
1308 * it returns false for all windows.
1309 *
1310 * @param window Window to test for modal exclusion
1311 *
1312 * @return true if the window is modal excluded, false otherwise. If
1313 * the modal exclusion isn't supported by the current Toolkit, false
1314 * is returned
1315 *
1316 * @see sun.awt.SunToolkit#isModalExcludedSupported
1317 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1318 *
1319 * @since 1.5
1320 */
1321 public static boolean isModalExcluded(Window window)
1322 {
1323 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1324 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1325 }
1326 return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1327 }
1328
1329 /**
1330 * Overridden in XToolkit and WToolkit
1331 */
1332 public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1333 return (modalityType == Dialog.ModalityType.MODELESS) ||
1334 (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1335 }
1336
1337 /**
1338 * Overridden in XToolkit and WToolkit
1339 */
1340 public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1341 return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1342 }
1343
1344 ///////////////////////////////////////////////////////////////////////////
1345 //
1346 // The following is used by the Java Plug-in to coordinate dialog modality
1347 // between containing applications (browsers, ActiveX containers etc) and
1348 // the AWT.
1349 //
1350 ///////////////////////////////////////////////////////////////////////////
1351
1352 private ModalityListenerList modalityListeners = new ModalityListenerList();
1353
1354 public void addModalityListener(ModalityListener listener) {
1355 modalityListeners.add(listener);
1356 }
1357
1358 public void removeModalityListener(ModalityListener listener) {
1359 modalityListeners.remove(listener);
1360 }
1361
1362 public void notifyModalityPushed(Dialog dialog) {
1363 notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1364 }
1365
1366 public void notifyModalityPopped(Dialog dialog) {
1367 notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1368 }
1369
1370 final void notifyModalityChange(int id, Dialog source) {
1371 ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1372 ev.dispatch();
1373 }
1374
1375 static class ModalityListenerList implements ModalityListener {
1376
1377 Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1378
1379 void add(ModalityListener listener) {
1380 listeners.addElement(listener);
1381 }
1382
1383 void remove(ModalityListener listener) {
1384 listeners.removeElement(listener);
1385 }
1386
1387 public void modalityPushed(ModalityEvent ev) {
1388 Iterator<ModalityListener> it = listeners.iterator();
1389 while (it.hasNext()) {
1390 it.next().modalityPushed(ev);
1391 }
1392 }
1393
1394 public void modalityPopped(ModalityEvent ev) {
1395 Iterator<ModalityListener> it = listeners.iterator();
1396 while (it.hasNext()) {
1397 it.next().modalityPopped(ev);
1398 }
1399 }
1400 } // end of class ModalityListenerList
1401
1402 ///////////////////////////////////////////////////////////////////////////
1403 // End Plug-in code
1404 ///////////////////////////////////////////////////////////////////////////
1405
1406 public static boolean isLightweightOrUnknown(Component comp) {
1407 if (comp.isLightweight()
1408 || !(getDefaultToolkit() instanceof SunToolkit))
1409 {
1410 return true;
1411 }
1412 return !(comp instanceof Button
1413 || comp instanceof Canvas
1414 || comp instanceof Checkbox
1415 || comp instanceof Choice
1416 || comp instanceof Label
1417 || comp instanceof java.awt.List
1418 || comp instanceof Panel
1419 || comp instanceof Scrollbar
1420 || comp instanceof ScrollPane
1421 || comp instanceof TextArea
1422 || comp instanceof TextField
1423 || comp instanceof Window);
1424 }
1425
1426 public static Method getMethod(final Class clz, final String methodName, final Class[] params) {
1427 Method res = null;
1428 try {
1429 res = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
1430 public Method run() throws Exception {
1431 Method m = clz.getDeclaredMethod(methodName, params);
1432 m.setAccessible(true);
1433 return m;
1434 }
1435 });
1436 } catch (PrivilegedActionException ex) {
1437 ex.printStackTrace();
1438 }
1439 return res;
1440 }
1441
1442 public static class OperationTimedOut extends RuntimeException {
1443 public OperationTimedOut(String msg) {
1444 super(msg);
1445 }
1446 public OperationTimedOut() {
1447 }
1448 }
1449 public static class InfiniteLoop extends RuntimeException {
1450 }
1451
1452 public static class IllegalThreadException extends RuntimeException {
1453 public IllegalThreadException(String msg) {
1454 super(msg);
1455 }
1456 public IllegalThreadException() {
1457 }
1458 }
1459
1460 public static final int DEFAULT_WAIT_TIME = 10000;
1461 private static final int MAX_ITERS = 20;
1462 private static final int MIN_ITERS = 0;
1463 private static final int MINIMAL_EDELAY = 0;
1464
1465 /**
1466 * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1467 */
1468 public void realSync() throws OperationTimedOut, InfiniteLoop {
1469 realSync(DEFAULT_WAIT_TIME);
1470 }
1471
1472 /**
1473 * Forces toolkit to synchronize with the native windowing
1474 * sub-system, flushing all pending work and waiting for all the
1475 * events to be processed. This method guarantees that after
1476 * return no additional Java events will be generated, unless
1477 * cause by user. Obviously, the method cannot be used on the
1478 * event dispatch thread (EDT). In case it nevertheless gets
1479 * invoked on this thread, the method throws the
1480 * IllegalThreadException runtime exception.
1481 *
1482 * <p> This method allows to write tests without explicit timeouts
1483 * or wait for some event. Example:
1484 * <code>
1485 * Frame f = ...;
1486 * f.setVisible(true);
1487 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1488 * </code>
1489 *
1490 * <p> After realSync, <code>f</code> will be completely visible
1491 * on the screen, its getLocationOnScreen will be returning the
1492 * right result and it will be the focus owner.
1493 *
1494 * <p> Another example:
1495 * <code>
1496 * b.requestFocus();
1497 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1498 * </code>
1499 *
1500 * <p> After realSync, <code>b</code> will be focus owner.
1501 *
1502 * <p> Notice that realSync isn't guaranteed to work if recurring
1503 * actions occur, such as if during processing of some event
1504 * another request which may generate some events occurs. By
1505 * default, sync tries to perform as much as {@value MAX_ITERS}
1506 * cycles of event processing, allowing for roughly {@value
1507 * MAX_ITERS} additional requests.
1508 *
1509 * <p> For example, requestFocus() generates native request, which
1510 * generates one or two Java focus events, which then generate a
1511 * serie of paint events, a serie of Java focus events, which then
1512 * generate a serie of paint events which then are processed -
1513 * three cycles, minimum.
1514 *
1515 * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1516 */
1517 public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1518 {
1519 if (EventQueue.isDispatchThread()) {
1520 throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1521 }
1522 int bigLoop = 0;
1523 do {
1524 // Let's do sync first
1525 sync();
1526
1527 // During the wait process, when we were processing incoming
1528 // events, we could have made some new request, which can
1529 // generate new events. Example: MapNotify/XSetInputFocus.
1530 // Therefore, we dispatch them as long as there is something
1531 // to dispatch.
1532 int iters = 0;
1533 while (iters < MIN_ITERS) {
1534 syncNativeQueue(timeout);
1535 iters++;
1536 }
1537 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1538 iters++;
1539 }
1540 if (iters >= MAX_ITERS) {
1541 throw new InfiniteLoop();
1542 }
1543
1544 // native requests were dispatched by X/Window Manager or Windows
1545 // Moreover, we processed them all on Toolkit thread
1546 // Now wait while EDT processes them.
1547 //
1548 // During processing of some events (focus, for example),
1549 // some other events could have been generated. So, after
1550 // waitForIdle, we may end up with full EventQueue
1551 iters = 0;
1552 while (iters < MIN_ITERS) {
1553 waitForIdle(timeout);
1554 iters++;
1555 }
1556 while (waitForIdle(timeout) && iters < MAX_ITERS) {
1557 iters++;
1558 }
1559 if (iters >= MAX_ITERS) {
1560 throw new InfiniteLoop();
1561 }
1562
1563 bigLoop++;
1564 // Again, for Java events, it was simple to check for new Java
1565 // events by checking event queue, but what if Java events
1566 // resulted in native requests? Therefor, check native events again.
1567 } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1568 }
1569
1570 /**
1571 * Platform toolkits need to implement this method to perform the
1572 * sync of the native queue. The method should wait until native
1573 * requests are processed, all native events are processed and
1574 * corresponding Java events are generated. Should return
1575 * <code>true</code> if some events were processed,
1576 * <code>false</code> otherwise.
1577 */
1578 protected abstract boolean syncNativeQueue(final long timeout);
1579
1580 private boolean eventDispatched = false;
1581 private boolean queueEmpty = false;
1582 private final Object waitLock = "Wait Lock";
1583
1584 static Method eqNoEvents;
1585
1586 private boolean isEQEmpty() {
1587 EventQueue queue = getSystemEventQueueImpl();
1588 synchronized(SunToolkit.class) {
1589 if (eqNoEvents == null) {
1590 eqNoEvents = getMethod(java.awt.EventQueue.class, "noEvents", null);
1591 }
1592 }
1593 try {
1594 return (Boolean)eqNoEvents.invoke(queue);
1595 } catch (Exception e) {
1596 e.printStackTrace();
1597 return false;
1598 }
1599 }
1600
1601 /**
1602 * Waits for the Java event queue to empty. Ensures that all
1603 * events are processed (including paint events), and that if
1604 * recursive events were generated, they are also processed.
1605 * Should return <code>true</code> if more processing is
1606 * necessary, <code>false</code> otherwise.
1607 */
1608 protected final boolean waitForIdle(final long timeout) {
1609 flushPendingEvents();
1610 boolean queueWasEmpty = isEQEmpty();
1611 queueEmpty = false;
1612 eventDispatched = false;
1613 synchronized(waitLock) {
1614 postEvent(AppContext.getAppContext(),
1615 new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1616 public void dispatch() {
1617 // Here we block EDT. It could have some
1618 // events, it should have dispatched them by
1619 // now. So native requests could have been
1620 // generated. First, dispatch them. Then,
1621 // flush Java events again.
1622 int iters = 0;
1623 while (iters < MIN_ITERS) {
1624 syncNativeQueue(timeout);
1625 iters++;
1626 }
1627 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1628 iters++;
1629 }
1630 flushPendingEvents();
1631
1632 synchronized(waitLock) {
1633 queueEmpty = isEQEmpty();
1634 eventDispatched = true;
1635 waitLock.notifyAll();
1636 }
1637 }
1638 });
1639 try {
1640 while (!eventDispatched) {
1641 waitLock.wait();
1642 }
1643 } catch (InterruptedException ie) {
1644 return false;
1645 }
1646 }
1647
1648 try {
1649 Thread.sleep(MINIMAL_EDELAY);
1650 } catch (InterruptedException ie) {
1651 throw new RuntimeException("Interrupted");
1652 }
1653
1654 flushPendingEvents();
1655
1656 // Lock to force write-cache flush for queueEmpty.
1657 synchronized (waitLock) {
1658 return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1659 }
1660 }
1661
1662 /**
1663 * Grabs the mouse input for the given window. The window must be
1664 * visible. The window or its children do not receive any
1665 * additional mouse events besides those targeted to them. All
1666 * other events will be dispatched as before - to the respective
1667 * targets. This Window will receive UngrabEvent when automatic
1668 * ungrab is about to happen. The event can be listened to by
1669 * installing AWTEventListener with WINDOW_EVENT_MASK. See
1670 * UngrabEvent class for the list of conditions when ungrab is
1671 * about to happen.
1672 * @see UngrabEvent
1673 */
1674 public abstract void grab(Window w);
1675
1676 /**
1677 * Forces ungrab. No event will be sent.
1678 */
1679 public abstract void ungrab(Window w);
1680
1681
1682 /**
1683 * Locates the splash screen library in a platform dependent way and closes
1684 * the splash screen. Should be invoked on first top-level frame display.
1685 * @see java.awt.SplashScreen
1686 * @since 1.6
1687 */
1688 public static native void closeSplashScreen();
1689
1690 /* The following methods and variables are to support retrieving
1691 * desktop text anti-aliasing settings
1692 */
1693
1694 /* Need an instance method because setDesktopProperty(..) is protected. */
1695 private void fireDesktopFontPropertyChanges() {
1696 setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1697 SunToolkit.getDesktopFontHints());
1698 }
1699
1700 private static boolean checkedSystemAAFontSettings;
1701 private static boolean useSystemAAFontSettings;
1702 private static boolean lastExtraCondition = true;
1703 private static RenderingHints desktopFontHints;
1704
1705 /* Since Swing is the reason for this "extra condition" logic its
1706 * worth documenting it in some detail.
1707 * First, a goal is for Swing and applications to both retrieve and
1708 * use the same desktop property value so that there is complete
1709 * consistency between the settings used by JDK's Swing implementation
1710 * and 3rd party custom Swing components, custom L&Fs and any general
1711 * text rendering that wants to be consistent with these.
1712 * But by default on Solaris & Linux Swing will not use AA text over
1713 * remote X11 display (unless Xrender can be used which is TBD and may not
1714 * always be available anyway) as that is a noticeable performance hit.
1715 * So there needs to be a way to express that extra condition so that
1716 * it is seen by all clients of the desktop property API.
1717 * If this were the only condition it could be handled here as it would
1718 * be the same for any L&F and could reasonably be considered to be
1719 * a static behaviour of those systems.
1720 * But GTK currently has an additional test based on locale which is
1721 * not applied by Metal. So mixing GTK in a few locales with Metal
1722 * would mean the last one wins.
1723 * This could be stored per-app context which would work
1724 * for different applets, but wouldn't help for a single application
1725 * using GTK and some other L&F concurrently.
1726 * But it is expected this will be addressed within GTK and the font
1727 * system so is a temporary and somewhat unlikely harmless corner case.
1728 */
1729 public static void setAAFontSettingsCondition(boolean extraCondition) {
1730 if (extraCondition != lastExtraCondition) {
1731 lastExtraCondition = extraCondition;
1732 if (checkedSystemAAFontSettings) {
1733 /* Someone already asked for this info, under a different
1734 * condition.
1735 * We'll force re-evaluation instead of replicating the
1736 * logic, then notify any listeners of any change.
1737 */
1738 checkedSystemAAFontSettings = false;
1739 Toolkit tk = Toolkit.getDefaultToolkit();
1740 if (tk instanceof SunToolkit) {
1741 ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1742 }
1743 }
1744 }
1745 }
1746
1747 /* "false", "off", ""default" aren't explicitly tested, they
1748 * just fall through to produce a null return which all are equated to
1749 * "false".
1750 */
1751 private static RenderingHints getDesktopAAHintsByName(String hintname) {
1752 Object aaHint = null;
1753 hintname = hintname.toLowerCase(Locale.ENGLISH);
1754 if (hintname.equals("on")) {
1755 aaHint = VALUE_TEXT_ANTIALIAS_ON;
1756 } else if (hintname.equals("gasp")) {
1757 aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1758 } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1759 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1760 } else if (hintname.equals("lcd_hbgr")) {
1761 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1762 } else if (hintname.equals("lcd_vrgb")) {
1763 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1764 } else if (hintname.equals("lcd_vbgr")) {
1765 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1766 }
1767 if (aaHint != null) {
1768 RenderingHints map = new RenderingHints(null);
1769 map.put(KEY_TEXT_ANTIALIASING, aaHint);
1770 return map;
1771 } else {
1772 return null;
1773 }
1774 }
1775
1776 /* This method determines whether to use the system font settings,
1777 * or ignore them if a L&F has specified they should be ignored, or
1778 * to override both of these with a system property specified value.
1779 * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1780 * system property isn't applied as desktop properties are considered
1781 * to be inapplicable in that case. In that headless case although
1782 * this method will return "true" the toolkit will return a null map.
1783 */
1784 private static boolean useSystemAAFontSettings() {
1785 if (!checkedSystemAAFontSettings) {
1786 useSystemAAFontSettings = true; /* initially set this true */
1787 String systemAAFonts = null;
1788 Toolkit tk = Toolkit.getDefaultToolkit();
1789 if (tk instanceof SunToolkit) {
1790 systemAAFonts =
1791 (String)AccessController.doPrivileged(
1792 new GetPropertyAction("awt.useSystemAAFontSettings"));
1793 }
1794 if (systemAAFonts != null) {
1795 useSystemAAFontSettings =
1796 Boolean.valueOf(systemAAFonts).booleanValue();
1797 /* If it is anything other than "true", then it may be
1798 * a hint name , or it may be "off, "default", etc.
1799 */
1800 if (!useSystemAAFontSettings) {
1801 desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1802 }
1803 }
1804 /* If its still true, apply the extra condition */
1805 if (useSystemAAFontSettings) {
1806 useSystemAAFontSettings = lastExtraCondition;
1807 }
1808 checkedSystemAAFontSettings = true;
1809 }
1810 return useSystemAAFontSettings;
1811 }
1812
1813 /* A variable defined for the convenience of JDK code */
1814 public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1815
1816 /* Overridden by subclasses to return platform/desktop specific values */
1817 protected RenderingHints getDesktopAAHints() {
1818 return null;
1819 }
1820
1821 /* Subclass desktop property loading methods call this which
1822 * in turn calls the appropriate subclass implementation of
1823 * getDesktopAAHints() when system settings are being used.
1824 * Its public rather than protected because subclasses may delegate
1825 * to a helper class.
1826 */
1827 public static RenderingHints getDesktopFontHints() {
1828 if (useSystemAAFontSettings()) {
1829 Toolkit tk = Toolkit.getDefaultToolkit();
1830 if (tk instanceof SunToolkit) {
1831 Object map = ((SunToolkit)tk).getDesktopAAHints();
1832 return (RenderingHints)map;
1833 } else { /* Headless Toolkit */
1834 return null;
1835 }
1836 } else if (desktopFontHints != null) {
1837 /* cloning not necessary as the return value is cloned later, but
1838 * its harmless.
1839 */
1840 return (RenderingHints)(desktopFontHints.clone());
1841 } else {
1842 return null;
1843 }
1844 }
1845
1846
1847 public abstract boolean isDesktopSupported();
1848
1849 /*
1850 * consumeNextKeyTyped() method is not currently used,
1851 * however Swing could use it in the future.
1852 */
1853 private static Method consumeNextKeyTypedMethod = null;
1854 public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1855 if (consumeNextKeyTypedMethod == null) {
1856 consumeNextKeyTypedMethod = getMethod(DefaultKeyboardFocusManager.class,
1857 "consumeNextKeyTyped",
1858 new Class[] {KeyEvent.class});
1859 }
1860 try {
1861 consumeNextKeyTypedMethod.invoke(KeyboardFocusManager.getCurrentKeyboardFocusManager(),
1862 keyEvent);
1863 } catch (IllegalAccessException iae) {
1864 iae.printStackTrace();
1865 } catch (InvocationTargetException ite) {
1866 ite.printStackTrace();
1867 }
1868 }
1869
1870 protected static void dumpPeers(final PlatformLogger aLog) {
1871 AWTAutoShutdown.getInstance().dumpPeers(aLog);
1872 }
1873
1874 /**
1875 * Returns the <code>Window</code> ancestor of the component <code>comp</code>.
1876 * @return Window ancestor of the component or component by itself if it is Window;
1877 * null, if component is not a part of window hierarchy
1878 */
1879 public static Window getContainingWindow(Component comp) {
1880 while (comp != null && !(comp instanceof Window)) {
1881 comp = comp.getParent();
1882 }
1883 return (Window)comp;
1884 }
1885
1886 /**
1887 * Returns the value of the system property indicated by the specified key.
1888 */
1889 public static String getSystemProperty(final String key) {
1890 return (String)AccessController.doPrivileged(new PrivilegedAction() {
1891 public Object run() {
1892 return System.getProperty(key);
1893 }
1894 });
1895 }
1896
1897 /**
1898 * Returns the boolean value of the system property indicated by the specified key.
1899 */
1900 protected static Boolean getBooleanSystemProperty(String key) {
1901 return Boolean.valueOf(AccessController.
1902 doPrivileged(new GetBooleanAction(key)));
1903 }
1904
1905 private static Boolean sunAwtDisableMixing = null;
1906
1907 /**
1908 * Returns the value of "sun.awt.disableMixing" property. Default
1909 * value is {@code false}.
1910 */
1911 public synchronized static boolean getSunAwtDisableMixing() {
1912 if (sunAwtDisableMixing == null) {
1913 sunAwtDisableMixing = getBooleanSystemProperty("sun.awt.disableMixing");
1914 }
1915 return sunAwtDisableMixing.booleanValue();
1916 }
1917
1918 /**
1919 * Returns true if the native GTK libraries are available. The
1920 * default implementation returns false, but UNIXToolkit overrides this
1921 * method to provide a more specific answer.
1922 */
1923 public boolean isNativeGTKAvailable() {
1924 return false;
1925 }
1926
1927 // Cosntant alpha
1928 public boolean isWindowOpacitySupported() {
1929 return false;
1930 }
1931
1932 // Shaping
1933 public boolean isWindowShapingSupported() {
1934 return false;
1935 }
1936
1937 // Per-pixel alpha
1938 public boolean isWindowTranslucencySupported() {
1939 return false;
1940 }
1941
1942 public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1943 return false;
1944 }
1945
1946 /**
1947 * Returns whether or not a containing top level window for the passed
1948 * component is
1949 * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1950 *
1951 * @param c a Component which toplevel's to check
1952 * @return {@code true} if the passed component is not null and has a
1953 * containing toplevel window which is opaque (so per-pixel translucency
1954 * is not enabled), {@code false} otherwise
1955 * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1956 */
1957 public static boolean isContainingTopLevelOpaque(Component c) {
1958 Window w = getContainingWindow(c);
1959 return w != null && w.isOpaque();
1960 }
1961
1962 /**
1963 * Returns whether or not a containing top level window for the passed
1964 * component is
1965 * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1966 *
1967 * @param c a Component which toplevel's to check
1968 * @return {@code true} if the passed component is not null and has a
1969 * containing toplevel window which has opacity less than
1970 * 1.0f (which means that it is translucent), {@code false} otherwise
1971 * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1972 */
1973 public static boolean isContainingTopLevelTranslucent(Component c) {
1974 Window w = getContainingWindow(c);
1975 return w != null && ((Window)w).getOpacity() < 1.0f;
1976 }
1977
1978 /**
1979 * Returns whether the native system requires using the peer.updateWindow()
1980 * method to update the contents of a non-opaque window, or if usual
1981 * painting procedures are sufficient. The default return value covers
1982 * the X11 systems. On MS Windows this method is overriden in WToolkit
1983 * to return true.
1984 */
1985 public boolean needUpdateWindow() {
1986 return false;
1987 }
1988
1989 /**
1990 * Descendants of the SunToolkit should override and put their own logic here.
1991 */
1992 public int getNumberOfButtons(){
1993 return 3;
1994 }
1995
1996 /**
1997 * Checks that the given object implements/extends the given
1998 * interface/class.
1999 *
2000 * Note that using the instanceof operator causes a class to be loaded.
2001 * Using this method doesn't load a class and it can be used instead of
2002 * the instanceof operator for performance reasons.
2003 *
2004 * @param obj Object to be checked
2005 * @param type The name of the interface/class. Must be
2006 * fully-qualified interface/class name.
2007 * @return true, if this object implements/extends the given
2008 * interface/class, false, otherwise, or if obj or type is null
2009 */
2010 public static boolean isInstanceOf(Object obj, String type) {
2011 if (obj == null) return false;
2012 if (type == null) return false;
2013
2014 return isInstanceOf(obj.getClass(), type);
2015 }
2016
2017 private static boolean isInstanceOf(Class cls, String type) {
2018 if (cls == null) return false;
2019
2020 if (cls.getName().equals(type)) {
2021 return true;
2022 }
2023
2024 for (Class c : cls.getInterfaces()) {
2025 if (c.getName().equals(type)) {
2026 return true;
2027 }
2028 }
2029 return isInstanceOf(cls.getSuperclass(), type);
2030 }
2031
2032 ///////////////////////////////////////////////////////////////////////////
2033 //
2034 // The following methods help set and identify whether a particular
2035 // AWTEvent object was produced by the system or by user code. As of this
2036 // writing the only consumer is the Java Plug-In, although this information
2037 // could be useful to more clients and probably should be formalized in
2038 // the public API.
2039 //
2040 ///////////////////////////////////////////////////////////////////////////
2041
2042 public static void setSystemGenerated(AWTEvent e) {
2043 AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2044 }
2045
2046 public static boolean isSystemGenerated(AWTEvent e) {
2047 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2048 }
2049
2050 } // class SunToolkit
2051
2052
2053 /*
2054 * PostEventQueue is a Thread that runs in the same AppContext as the
2055 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2056 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2057 * events to this queue, which then calls EventQueue.postEvent().
2058 *
2059 * We do this because EventQueue.postEvent() may be overridden by client
2060 * code, and we mustn't ever call client code from the toolkit thread.
2061 */
2062 class PostEventQueue {
2063 private EventQueueItem queueHead = null;
2064 private EventQueueItem queueTail = null;
2065 private final EventQueue eventQueue;
2066
2067 PostEventQueue(EventQueue eq) {
2068 eventQueue = eq;
2069 }
2070
2071 public synchronized boolean noEvents() {
2072 return queueHead == null;
2073 }
2074
2075 /*
2076 * Continually post pending AWTEvents to the Java EventQueue. The method
2077 * is synchronized to ensure the flush is completed before a new event
2078 * can be posted to this queue.
2079 */
2080 public synchronized void flush() {
2081 EventQueueItem tempQueue = queueHead;
2082 queueHead = queueTail = null;
2083 while (tempQueue != null) {
2084 eventQueue.postEvent(tempQueue.event);
2085 tempQueue = tempQueue.next;
2086 }
2087 }
2088
2089 /*
2090 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2091 */
2092 void postEvent(AWTEvent event) {
2093 EventQueueItem item = new EventQueueItem(event);
2094
2095 synchronized (this) {
2096 if (queueHead == null) {
2097 queueHead = queueTail = item;
2098 } else {
2099 queueTail.next = item;
2100 queueTail = item;
2101 }
2102 }
2103 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2104 }
2105 } // class PostEventQueue