1 /*
2 * Copyright (c) 1997, 2015, 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 java.awt.event.InputEvent;
30 import java.awt.event.KeyEvent;
31 import java.awt.event.WindowEvent;
32 import java.awt.image.BufferedImage;
33 import java.awt.image.DataBuffer;
34 import java.awt.image.DataBufferInt;
35 import java.awt.image.ImageObserver;
36 import java.awt.image.ImageProducer;
37 import java.awt.image.Raster;
38 import java.awt.peer.FramePeer;
39 import java.awt.peer.KeyboardFocusManagerPeer;
40 import java.awt.peer.MouseInfoPeer;
41 import java.awt.peer.SystemTrayPeer;
42 import java.awt.peer.TrayIconPeer;
43 import java.io.File;
44 import java.io.IOException;
45 import java.io.InputStream;
46 import java.lang.reflect.InvocationTargetException;
47 import java.net.URL;
48 import java.security.AccessController;
49 import java.util.Collections;
50 import java.util.Iterator;
51 import java.util.Locale;
52 import java.util.Map;
53 import java.util.Vector;
54 import java.util.WeakHashMap;
55 import java.util.concurrent.TimeUnit;
56 import java.util.concurrent.locks.Condition;
57 import java.util.concurrent.locks.ReentrantLock;
58
59 import sun.awt.im.InputContext;
60 import sun.awt.image.ByteArrayImageSource;
61 import sun.awt.image.FileImageSource;
62 import sun.awt.image.ImageRepresentation;
63 import sun.awt.image.MultiResolutionImage;
64 import sun.awt.image.MultiResolutionToolkitImage;
65 import sun.awt.image.ToolkitImage;
66 import sun.awt.image.URLImageSource;
67 import sun.font.FontDesignMetrics;
68 import sun.misc.SoftCache;
69 import sun.security.action.GetBooleanAction;
70 import sun.security.action.GetPropertyAction;
71 import sun.util.logging.PlatformLogger;
72
73 import static java.awt.RenderingHints.*;
74
75 public abstract class SunToolkit extends Toolkit
76 implements ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
77
78 // 8014718: logging has been removed from SunToolkit
79
80 /* Load debug settings for native code */
81 static {
82 if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
83 DebugSettings.init();
84 }
85 };
86
87 /**
88 * Special mask for the UngrabEvent events, in addition to the
89 * public masks defined in AWTEvent. Should be used as the mask
90 * value for Toolkit.addAWTEventListener.
91 */
92 public static final int GRAB_EVENT_MASK = 0x80000000;
93
94 /* The key to put()/get() the PostEventQueue into/from the AppContext.
95 */
96 private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
97
98 /**
99 * Number of buttons.
100 * By default it's taken from the system. If system value does not
101 * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
102 */
103 protected static int numberOfButtons = 0;
104
105
106 /* XFree standard mention 24 buttons as maximum:
107 * http://www.xfree86.org/current/mouse.4.html
108 * We workaround systems supporting more than 24 buttons.
109 * Otherwise, we have to use long type values as masks
110 * which leads to API change.
111 * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
112 * the 4-bytes limit for the int type. (CR 6799099)
113 * One more bit is reserved for FIRST_HIGH_BIT.
114 */
115 public final static int MAX_BUTTONS_SUPPORTED = 20;
116
117 /**
118 * Creates and initializes EventQueue instance for the specified
119 * AppContext.
120 * Note that event queue must be created from createNewAppContext()
121 * only in order to ensure that EventQueue constructor obtains
122 * the correct AppContext.
123 * @param appContext AppContext to associate with the event queue
124 */
125 private static void initEQ(AppContext appContext) {
126 EventQueue eventQueue;
127
128 String eqName = System.getProperty("AWT.EventQueueClass",
129 "java.awt.EventQueue");
130
131 try {
132 eventQueue = (EventQueue)Class.forName(eqName).newInstance();
133 } catch (Exception e) {
134 e.printStackTrace();
135 System.err.println("Failed loading " + eqName + ": " + e);
136 eventQueue = new EventQueue();
137 }
138 appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
139
140 PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
141 appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
142 }
143
144 public SunToolkit() {
145 }
146
147 public boolean useBufferPerWindow() {
148 return false;
149 }
150
151 public abstract FramePeer createLightweightFrame(LightweightFrame target)
152 throws HeadlessException;
153
154 public abstract TrayIconPeer createTrayIcon(TrayIcon target)
155 throws HeadlessException, AWTException;
156
157 public abstract SystemTrayPeer createSystemTray(SystemTray target);
158
159 public abstract boolean isTraySupported();
160
161 @Override
162 public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
163 throws HeadlessException;
164
165 /**
166 * The AWT lock is typically only used on Unix platforms to synchronize
167 * access to Xlib, OpenGL, etc. However, these methods are implemented
168 * in SunToolkit so that they can be called from shared code (e.g.
169 * from the OGL pipeline) or from the X11 pipeline regardless of whether
170 * XToolkit or MToolkit is currently in use. There are native macros
171 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
172 * methods is changed, make sure it is compatible with the native macros.
173 *
174 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
175 * used in place of:
176 * synchronized (getAWTLock()) {
177 * ...
178 * }
179 *
180 * By factoring these methods out specially, we are able to change the
181 * implementation of these methods (e.g. use more advanced locking
182 * mechanisms) without impacting calling code.
183 *
184 * Sample usage:
185 * private void doStuffWithXlib() {
186 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
187 * SunToolkit.awtLock();
188 * try {
189 * ...
190 * XlibWrapper.XDoStuff();
191 * } finally {
192 * SunToolkit.awtUnlock();
193 * }
194 * }
195 */
196
197 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
198 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
199
200 public static final void awtLock() {
201 AWT_LOCK.lock();
202 }
203
204 public static final boolean awtTryLock() {
205 return AWT_LOCK.tryLock();
206 }
207
208 public static final void awtUnlock() {
209 AWT_LOCK.unlock();
210 }
211
212 public static final void awtLockWait()
213 throws InterruptedException
214 {
215 AWT_LOCK_COND.await();
216 }
217
218 public static final void awtLockWait(long timeout)
219 throws InterruptedException
220 {
221 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
222 }
223
224 public static final void awtLockNotify() {
225 AWT_LOCK_COND.signal();
226 }
227
228 public static final void awtLockNotifyAll() {
229 AWT_LOCK_COND.signalAll();
230 }
231
232 public static final boolean isAWTLockHeldByCurrentThread() {
233 return AWT_LOCK.isHeldByCurrentThread();
234 }
235
236 /*
237 * Create a new AppContext, along with its EventQueue, for a
238 * new ThreadGroup. Browser code, for example, would use this
239 * method to create an AppContext & EventQueue for an Applet.
240 */
241 public static AppContext createNewAppContext() {
242 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
243 return createNewAppContext(threadGroup);
244 }
245
246 static final AppContext createNewAppContext(ThreadGroup threadGroup) {
247 // Create appContext before initialization of EventQueue, so all
248 // the calls to AppContext.getAppContext() from EventQueue ctor
249 // return correct values
250 AppContext appContext = new AppContext(threadGroup);
251 initEQ(appContext);
252
253 return appContext;
254 }
255
256 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
257 AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
258 }
259
260 /*
261 * Fetch the peer associated with the given target (as specified
262 * in the peer creation method). This can be used to determine
263 * things like what the parent peer is. If the target is null
264 * or the target can't be found (either because the a peer was
265 * never created for it or the peer was disposed), a null will
266 * be returned.
267 */
268 protected static Object targetToPeer(Object target) {
269 if (target != null && !GraphicsEnvironment.isHeadless()) {
270 return AWTAutoShutdown.getInstance().getPeer(target);
271 }
272 return null;
273 }
274
275 protected static void targetCreatedPeer(Object target, Object peer) {
276 if (target != null && peer != null &&
277 !GraphicsEnvironment.isHeadless())
278 {
279 AWTAutoShutdown.getInstance().registerPeer(target, peer);
280 }
281 }
282
283 protected static void targetDisposedPeer(Object target, Object peer) {
284 if (target != null && peer != null &&
285 !GraphicsEnvironment.isHeadless())
286 {
287 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
288 }
289 }
290
291 // Maps from non-Component/MenuComponent to AppContext.
292 // WeakHashMap<Component,AppContext>
293 private static final Map<Object, AppContext> appContextMap =
294 Collections.synchronizedMap(new WeakHashMap<Object, AppContext>());
295
296 /**
297 * Sets the appContext field of target. If target is not a Component or
298 * MenuComponent, this returns false.
299 */
300 private static boolean setAppContext(Object target,
301 AppContext context) {
302 if (target instanceof Component) {
303 AWTAccessor.getComponentAccessor().
304 setAppContext((Component)target, context);
305 } else if (target instanceof MenuComponent) {
306 AWTAccessor.getMenuComponentAccessor().
307 setAppContext((MenuComponent)target, context);
308 } else {
309 return false;
310 }
311 return true;
312 }
313
314 /**
315 * Returns the appContext field for target. If target is not a
316 * Component or MenuComponent this returns null.
317 */
318 private static AppContext getAppContext(Object target) {
319 if (target instanceof Component) {
320 return AWTAccessor.getComponentAccessor().
321 getAppContext((Component)target);
322 } else if (target instanceof MenuComponent) {
323 return AWTAccessor.getMenuComponentAccessor().
324 getAppContext((MenuComponent)target);
325 } else {
326 return null;
327 }
328 }
329
330 /*
331 * Fetch the AppContext associated with the given target.
332 * This can be used to determine things like which EventQueue
333 * to use for posting events to a Component. If the target is
334 * null or the target can't be found, a null with be returned.
335 */
336 public static AppContext targetToAppContext(Object target) {
337 if (target == null) {
338 return null;
339 }
340 AppContext context = getAppContext(target);
341 if (context == null) {
342 // target is not a Component/MenuComponent, try the
343 // appContextMap.
344 context = appContextMap.get(target);
345 }
346 return context;
347 }
348
349 /**
350 * Sets the synchronous status of focus requests on lightweight
351 * components in the specified window to the specified value.
352 * If the boolean parameter is <code>true</code> then the focus
353 * requests on lightweight components will be performed
354 * synchronously, if it is <code>false</code>, then asynchronously.
355 * By default, all windows have their lightweight request status
356 * set to asynchronous.
357 * <p>
358 * The application can only set the status of lightweight focus
359 * requests to synchronous for any of its windows if it doesn't
360 * perform focus transfers between different heavyweight containers.
361 * In this case the observable focus behaviour is the same as with
362 * asynchronous status.
363 * <p>
364 * If the application performs focus transfer between different
365 * heavyweight containers and sets the lightweight focus request
366 * status to synchronous for any of its windows, then further focus
367 * behaviour is unspecified.
368 * <p>
369 * @param changed the window for which the lightweight focus request
370 * status should be set
371 * @param status the value of lightweight focus request status
372 */
373
374 public static void setLWRequestStatus(Window changed,boolean status){
375 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
376 };
377
378 public static void checkAndSetPolicy(Container cont) {
379 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
380 getCurrentKeyboardFocusManager().
381 getDefaultFocusTraversalPolicy();
382
383 cont.setFocusTraversalPolicy(defaultPolicy);
384 }
385
386 private static FocusTraversalPolicy createLayoutPolicy() {
387 FocusTraversalPolicy policy = null;
388 try {
389 Class<?> layoutPolicyClass =
390 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
391 policy = (FocusTraversalPolicy)layoutPolicyClass.newInstance();
392 }
393 catch (ClassNotFoundException e) {
394 assert false;
395 }
396 catch (InstantiationException e) {
397 assert false;
398 }
399 catch (IllegalAccessException e) {
400 assert false;
401 }
402
403 return policy;
404 }
405
406 /*
407 * Insert a mapping from target to AppContext, for later retrieval
408 * via targetToAppContext() above.
409 */
410 public static void insertTargetMapping(Object target, AppContext appContext) {
411 if (!setAppContext(target, appContext)) {
412 // Target is not a Component/MenuComponent, use the private Map
413 // instead.
414 appContextMap.put(target, appContext);
415 }
416 }
417
418 /*
419 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
420 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
421 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
422 * not be called under another lock since it locks the EventQueue.
423 * See bugids 4632918, 4526597.
424 */
425 public static void postEvent(AppContext appContext, AWTEvent event) {
426 if (event == null) {
427 throw new NullPointerException();
428 }
429
430 AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
431 if (sea != null && sea.isSequencedEvent(event)) {
432 AWTEvent nested = sea.getNested(event);
433 if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
434 nested instanceof TimedWindowEvent)
435 {
436 TimedWindowEvent twe = (TimedWindowEvent)nested;
437 ((SunToolkit)Toolkit.getDefaultToolkit()).
438 setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
439 }
440 }
441
442 // All events posted via this method are system-generated.
443 // Placing the following call here reduces considerably the
444 // number of places throughout the toolkit that would
445 // otherwise have to be modified to precisely identify
446 // system-generated events.
447 setSystemGenerated(event);
448 AppContext eventContext = targetToAppContext(event.getSource());
449 if (eventContext != null && !eventContext.equals(appContext)) {
450 throw new RuntimeException("Event posted on wrong app context : " + event);
451 }
452 PostEventQueue postEventQueue =
453 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
454 if (postEventQueue != null) {
455 postEventQueue.postEvent(event);
456 }
457 }
458
459 /*
460 * Post AWTEvent of high priority.
461 */
462 public static void postPriorityEvent(final AWTEvent e) {
463 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
464 @Override
465 public void run() {
466 AWTAccessor.getAWTEventAccessor().setPosted(e);
467 ((Component)e.getSource()).dispatchEvent(e);
468 }
469 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
470 postEvent(targetToAppContext(e.getSource()), pe);
471 }
472
473 /*
474 * Flush any pending events which haven't been posted to the AWT
475 * EventQueue yet.
476 */
477 public static void flushPendingEvents() {
478 AppContext appContext = AppContext.getAppContext();
479 flushPendingEvents(appContext);
480 }
481
482 /*
483 * Flush the PostEventQueue for the right AppContext.
484 * The default flushPendingEvents only flushes the thread-local context,
485 * which is not always correct, c.f. 3746956
486 */
487 public static void flushPendingEvents(AppContext appContext) {
488 PostEventQueue postEventQueue =
489 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
490 if (postEventQueue != null) {
491 postEventQueue.flush();
492 }
493 }
494
495 /*
496 * Execute a chunk of code on the Java event handler thread for the
497 * given target. Does not wait for the execution to occur before
498 * returning to the caller.
499 */
500 public static void executeOnEventHandlerThread(Object target,
501 Runnable runnable) {
502 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
503 }
504
505 /*
506 * Fixed 5064013: the InvocationEvent time should be equals
507 * the time of the ActionEvent
508 */
509 @SuppressWarnings("serial")
510 public static void executeOnEventHandlerThread(Object target,
511 Runnable runnable,
512 final long when) {
513 executeOnEventHandlerThread(
514 new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT) {
515 @Override
516 public long getWhen() {
517 return when;
518 }
519 });
520 }
521
522 /*
523 * Execute a chunk of code on the Java event handler thread for the
524 * given target. Does not wait for the execution to occur before
525 * returning to the caller.
526 */
527 public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
528 postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
529 }
530
531 /*
532 * Execute a chunk of code on the Java event handler thread. The
533 * method takes into account provided AppContext and sets
534 * <code>SunToolkit.getDefaultToolkit()</code> as a target of the
535 * event. See 6451487 for detailes.
536 * Does not wait for the execution to occur before returning to
537 * the caller.
538 */
539 public static void invokeLaterOnAppContext(
540 AppContext appContext, Runnable dispatcher)
541 {
542 postEvent(appContext,
543 new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
544 PeerEvent.PRIORITY_EVENT));
545 }
546
547 /*
548 * Execute a chunk of code on the Java event handler thread for the
549 * given target. Waits for the execution to occur before returning
550 * to the caller.
551 */
552 public static void executeOnEDTAndWait(Object target, Runnable runnable)
553 throws InterruptedException, InvocationTargetException
554 {
555 if (EventQueue.isDispatchThread()) {
556 throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
557 }
558
559 class AWTInvocationLock {}
560 Object lock = new AWTInvocationLock();
561
562 PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
563
564 synchronized (lock) {
565 executeOnEventHandlerThread(event);
566 while(!event.isDispatched()) {
567 lock.wait();
568 }
569 }
570
571 Throwable eventThrowable = event.getThrowable();
572 if (eventThrowable != null) {
573 throw new InvocationTargetException(eventThrowable);
574 }
575 }
576
577 /*
578 * Returns true if the calling thread is the event dispatch thread
579 * contained within AppContext which associated with the given target.
580 * Use this call to ensure that a given task is being executed
581 * (or not being) on the event dispatch thread for the given target.
582 */
583 public static boolean isDispatchThreadForAppContext(Object target) {
584 AppContext appContext = targetToAppContext(target);
585 EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
586
587 AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
588 return accessor.isDispatchThreadImpl(eq);
589 }
590
591 @Override
592 public Dimension getScreenSize() {
593 return new Dimension(getScreenWidth(), getScreenHeight());
594 }
595 protected abstract int getScreenWidth();
596 protected abstract int getScreenHeight();
597
598 @Override
599 @SuppressWarnings("deprecation")
600 public FontMetrics getFontMetrics(Font font) {
601 return FontDesignMetrics.getMetrics(font);
602 }
603
604 @Override
605 @SuppressWarnings("deprecation")
606 public String[] getFontList() {
607 String[] hardwiredFontList = {
608 Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
609 Font.DIALOG_INPUT
610
611 // -- Obsolete font names from 1.0.2. It was decided that
612 // -- getFontList should not return these old names:
613 // "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
614 };
615 return hardwiredFontList;
616 }
617
618 /**
619 * Disables erasing of background on the canvas before painting if
620 * this is supported by the current toolkit. It is recommended to
621 * call this method early, before the Canvas becomes displayable,
622 * because some Toolkit implementations do not support changing
623 * this property once the Canvas becomes displayable.
624 */
625 public void disableBackgroundErase(Canvas canvas) {
626 disableBackgroundEraseImpl(canvas);
627 }
628
629 /**
630 * Disables the native erasing of the background on the given
631 * component before painting if this is supported by the current
632 * toolkit. This only has an effect for certain components such as
633 * Canvas, Panel and Window. It is recommended to call this method
634 * early, before the Component becomes displayable, because some
635 * Toolkit implementations do not support changing this property
636 * once the Component becomes displayable.
637 */
638 public void disableBackgroundErase(Component component) {
639 disableBackgroundEraseImpl(component);
640 }
641
642 private void disableBackgroundEraseImpl(Component component) {
643 AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
644 }
645
646 /**
647 * Returns the value of "sun.awt.noerasebackground" property. Default
648 * value is {@code false}.
649 */
650 public static boolean getSunAwtNoerasebackground() {
651 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
652 }
653
654 /**
655 * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
656 * value is {@code false}.
657 */
658 public static boolean getSunAwtErasebackgroundonresize() {
659 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
660 }
661
662
663 @SuppressWarnings("deprecation")
664 static final SoftCache imgCache = new SoftCache();
665
666 static Image getImageFromHash(Toolkit tk, URL url) {
667 checkPermissions(url);
668 synchronized (imgCache) {
669 Image img = (Image)imgCache.get(url);
670 if (img == null) {
671 try {
672 img = tk.createImage(new URLImageSource(url));
673 imgCache.put(url, img);
674 } catch (Exception e) {
675 }
676 }
677 return img;
678 }
679 }
680
681 static Image getImageFromHash(Toolkit tk,
682 String filename) {
683 checkPermissions(filename);
684 synchronized (imgCache) {
685 Image img = (Image)imgCache.get(filename);
686 if (img == null) {
687 try {
688 img = tk.createImage(new FileImageSource(filename));
689 imgCache.put(filename, img);
690 } catch (Exception e) {
691 }
692 }
693 return img;
694 }
695 }
696
697 @Override
698 public Image getImage(String filename) {
699 return getImageFromHash(this, filename);
700 }
701
702 @Override
703 public Image getImage(URL url) {
704 return getImageFromHash(this, url);
705 }
706
707 protected Image getImageWithResolutionVariant(String fileName,
708 String resolutionVariantName) {
709 synchronized (imgCache) {
710 Image image = getImageFromHash(this, fileName);
711 if (image instanceof MultiResolutionImage) {
712 return image;
713 }
714 Image resolutionVariant = getImageFromHash(this, resolutionVariantName);
715 image = createImageWithResolutionVariant(image, resolutionVariant);
716 imgCache.put(fileName, image);
717 return image;
718 }
719 }
720
721 protected Image getImageWithResolutionVariant(URL url,
722 URL resolutionVariantURL) {
723 synchronized (imgCache) {
724 Image image = getImageFromHash(this, url);
725 if (image instanceof MultiResolutionImage) {
726 return image;
727 }
728 Image resolutionVariant = getImageFromHash(this, resolutionVariantURL);
729 image = createImageWithResolutionVariant(image, resolutionVariant);
730 imgCache.put(url, image);
731 return image;
732 }
733 }
734
735
736 @Override
737 public Image createImage(String filename) {
738 checkPermissions(filename);
739 return createImage(new FileImageSource(filename));
740 }
741
742 @Override
743 public Image createImage(URL url) {
744 checkPermissions(url);
745 return createImage(new URLImageSource(url));
746 }
747
748 @Override
749 public Image createImage(byte[] data, int offset, int length) {
750 return createImage(new ByteArrayImageSource(data, offset, length));
751 }
752
753 @Override
754 public Image createImage(ImageProducer producer) {
755 return new ToolkitImage(producer);
756 }
757
758 public static Image createImageWithResolutionVariant(Image image,
759 Image resolutionVariant) {
760 return new MultiResolutionToolkitImage(image, resolutionVariant);
761 }
762
763 @Override
764 public int checkImage(Image img, int w, int h, ImageObserver o) {
765 if (!(img instanceof ToolkitImage)) {
766 return ImageObserver.ALLBITS;
767 }
768
769 ToolkitImage tkimg = (ToolkitImage)img;
770 int repbits;
771 if (w == 0 || h == 0) {
772 repbits = ImageObserver.ALLBITS;
773 } else {
774 repbits = tkimg.getImageRep().check(o);
775 }
776 return (tkimg.check(o) | repbits) & checkResolutionVariant(img, w, h, o);
777 }
778
779 @Override
780 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
781 if (w == 0 || h == 0) {
782 return true;
783 }
784
785 // Must be a ToolkitImage
786 if (!(img instanceof ToolkitImage)) {
787 return true;
788 }
789
790 ToolkitImage tkimg = (ToolkitImage)img;
791 if (tkimg.hasError()) {
792 if (o != null) {
793 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
794 -1, -1, -1, -1);
795 }
796 return false;
797 }
798 ImageRepresentation ir = tkimg.getImageRep();
799 return ir.prepare(o) & prepareResolutionVariant(img, w, h, o);
800 }
801
802 private int checkResolutionVariant(Image img, int w, int h, ImageObserver o) {
803 ToolkitImage rvImage = getResolutionVariant(img);
804 int rvw = getRVSize(w);
805 int rvh = getRVSize(h);
806 // Ignore the resolution variant in case of error
807 return (rvImage == null || rvImage.hasError()) ? 0xFFFF :
808 checkImage(rvImage, rvw, rvh, MultiResolutionToolkitImage.
809 getResolutionVariantObserver(
810 img, o, w, h, rvw, rvh, true));
811 }
812
813 private boolean prepareResolutionVariant(Image img, int w, int h,
814 ImageObserver o) {
815
816 ToolkitImage rvImage = getResolutionVariant(img);
817 int rvw = getRVSize(w);
818 int rvh = getRVSize(h);
819 // Ignore the resolution variant in case of error
820 return rvImage == null || rvImage.hasError() || prepareImage(
821 rvImage, rvw, rvh,
822 MultiResolutionToolkitImage.getResolutionVariantObserver(
823 img, o, w, h, rvw, rvh, true));
824 }
825
826 private static int getRVSize(int size){
827 return size == -1 ? -1 : 2 * size;
828 }
829
830 private static ToolkitImage getResolutionVariant(Image image) {
831 if (image instanceof MultiResolutionToolkitImage) {
832 Image resolutionVariant = ((MultiResolutionToolkitImage) image).
833 getResolutionVariant();
834 if (resolutionVariant instanceof ToolkitImage) {
835 return (ToolkitImage) resolutionVariant;
836 }
837 }
838 return null;
839 }
840
841 protected static boolean imageCached(Object key) {
842 return imgCache.containsKey(key);
843 }
844
845 protected static boolean imageExists(String filename) {
846 if (filename != null) {
847 checkPermissions(filename);
848 return new File(filename).exists();
849 }
850 return false;
851 }
852
853 @SuppressWarnings("try")
854 protected static boolean imageExists(URL url) {
855 if (url != null) {
856 checkPermissions(url);
857 try (InputStream is = url.openStream()) {
858 return true;
859 }catch(IOException e){
860 return false;
861 }
862 }
863 return false;
864 }
865
866 private static void checkPermissions(String filename) {
867 SecurityManager security = System.getSecurityManager();
868 if (security != null) {
869 security.checkRead(filename);
870 }
871 }
872
873 private static void checkPermissions(URL url) {
874 SecurityManager sm = System.getSecurityManager();
875 if (sm != null) {
876 try {
877 java.security.Permission perm =
878 url.openConnection().getPermission();
879 if (perm != null) {
880 try {
881 sm.checkPermission(perm);
882 } catch (SecurityException se) {
883 // fallback to checkRead/checkConnect for pre 1.2
884 // security managers
885 if ((perm instanceof java.io.FilePermission) &&
886 perm.getActions().indexOf("read") != -1) {
887 sm.checkRead(perm.getName());
888 } else if ((perm instanceof
889 java.net.SocketPermission) &&
890 perm.getActions().indexOf("connect") != -1) {
891 sm.checkConnect(url.getHost(), url.getPort());
892 } else {
893 throw se;
894 }
895 }
896 }
897 } catch (java.io.IOException ioe) {
898 sm.checkConnect(url.getHost(), url.getPort());
899 }
900 }
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 continue;
925 }
926 if (im instanceof ToolkitImage) {
927 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
928 ir.reconstruct(ImageObserver.ALLBITS);
929 }
930 int iw;
931 int ih;
932 try {
933 iw = im.getWidth(null);
934 ih = im.getHeight(null);
935 } catch (Exception e){
936 continue;
937 }
938 if (iw > 0 && ih > 0) {
939 //Calc scale factor
940 double scaleFactor = Math.min((double)width / (double)iw,
941 (double)height / (double)ih);
942 //Calculate scaled image dimensions
943 //adjusting scale factor to nearest "good" value
944 int adjw = 0;
945 int adjh = 0;
946 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
947 if (scaleFactor >= 2) {
948 //Need to enlarge image more than twice
949 //Round down scale factor to multiply by integer value
950 scaleFactor = Math.floor(scaleFactor);
951 adjw = iw * (int)scaleFactor;
952 adjh = ih * (int)scaleFactor;
953 scaleMeasure = 1.0 - 0.5 / scaleFactor;
954 } else if (scaleFactor >= 1) {
955 //Don't scale
956 scaleFactor = 1.0;
957 adjw = iw;
958 adjh = ih;
959 scaleMeasure = 0;
960 } else if (scaleFactor >= 0.75) {
961 //Multiply by 3/4
962 scaleFactor = 0.75;
963 adjw = iw * 3 / 4;
964 adjh = ih * 3 / 4;
965 scaleMeasure = 0.3;
966 } else if (scaleFactor >= 0.6666) {
967 //Multiply by 2/3
968 scaleFactor = 0.6666;
969 adjw = iw * 2 / 3;
970 adjh = ih * 2 / 3;
971 scaleMeasure = 0.33;
972 } else {
973 //Multiply size by 1/scaleDivider
974 //where scaleDivider is minimum possible integer
975 //larger than 1/scaleFactor
976 double scaleDivider = Math.ceil(1.0 / scaleFactor);
977 scaleFactor = 1.0 / scaleDivider;
978 adjw = (int)Math.round((double)iw / scaleDivider);
979 adjh = (int)Math.round((double)ih / scaleDivider);
980 scaleMeasure = 1.0 - 1.0 / scaleDivider;
981 }
982 double similarity = ((double)width - (double)adjw) / (double)width +
983 ((double)height - (double)adjh) / (double)height + //Large padding is bad
984 scaleMeasure; //Large rescale is bad
985 if (similarity < bestSimilarity) {
986 bestSimilarity = similarity;
987 bestScaleFactor = scaleFactor;
988 bestImage = im;
989 bestWidth = adjw;
990 bestHeight = adjh;
991 }
992 if (similarity == 0) break;
993 }
994 }
995 if (bestImage == null) {
996 //No images were found, possibly all are broken
997 return null;
998 }
999 BufferedImage bimage =
1000 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
1001 Graphics2D g = bimage.createGraphics();
1002 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
1003 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
1004 try {
1005 int x = (width - bestWidth) / 2;
1006 int y = (height - bestHeight) / 2;
1007 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
1008 } finally {
1009 g.dispose();
1010 }
1011 return bimage;
1012 }
1013
1014 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
1015 BufferedImage bimage = getScaledIconImage(imageList, width, height);
1016 if (bimage == null) {
1017 return null;
1018 }
1019 Raster raster = bimage.getRaster();
1020 DataBuffer buffer = raster.getDataBuffer();
1021 return (DataBufferInt)buffer;
1022 }
1023
1024 @Override
1025 protected EventQueue getSystemEventQueueImpl() {
1026 return getSystemEventQueueImplPP();
1027 }
1028
1029 // Package private implementation
1030 static EventQueue getSystemEventQueueImplPP() {
1031 return getSystemEventQueueImplPP(AppContext.getAppContext());
1032 }
1033
1034 public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1035 EventQueue theEventQueue =
1036 (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1037 return theEventQueue;
1038 }
1039
1040 /**
1041 * Give native peers the ability to query the native container
1042 * given a native component (eg the direct parent may be lightweight).
1043 */
1044 public static Container getNativeContainer(Component c) {
1045 return Toolkit.getNativeContainer(c);
1046 }
1047
1048 /**
1049 * Gives native peers the ability to query the closest HW component.
1050 * If the given component is heavyweight, then it returns this. Otherwise,
1051 * it goes one level up in the hierarchy and tests next component.
1052 */
1053 public static Component getHeavyweightComponent(Component c) {
1054 while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1055 c = AWTAccessor.getComponentAccessor().getParent(c);
1056 }
1057 return c;
1058 }
1059
1060 /**
1061 * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1062 */
1063 public int getFocusAcceleratorKeyMask() {
1064 return InputEvent.ALT_MASK;
1065 }
1066
1067 /**
1068 * Tests whether specified key modifiers mask can be used to enter a printable
1069 * character. This is a default implementation of this method, which reflects
1070 * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1071 * characters from the extended character set (like euro sign or math symbols)
1072 */
1073 public boolean isPrintableCharacterModifiersMask(int mods) {
1074 return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1075 }
1076
1077 /**
1078 * Returns whether popup is allowed to be shown above the task bar.
1079 * This is a default implementation of this method, which checks
1080 * corresponding security permission.
1081 */
1082 public boolean canPopupOverlapTaskBar() {
1083 boolean result = true;
1084 try {
1085 SecurityManager sm = System.getSecurityManager();
1086 if (sm != null) {
1087 sm.checkPermission(AWTPermissions.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1088 }
1089 } catch (SecurityException se) {
1090 // There is no permission to show popups over the task bar
1091 result = false;
1092 }
1093 return result;
1094 }
1095
1096 /**
1097 * Returns a new input method window, with behavior as specified in
1098 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1099 * If the inputContext is not null, the window should return it from its
1100 * getInputContext() method. The window needs to implement
1101 * sun.awt.im.InputMethodWindow.
1102 * <p>
1103 * SunToolkit subclasses can override this method to return better input
1104 * method windows.
1105 */
1106 @Override
1107 public Window createInputMethodWindow(String title, InputContext context) {
1108 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1109 }
1110
1111 /**
1112 * Returns whether enableInputMethods should be set to true for peered
1113 * TextComponent instances on this platform. False by default.
1114 */
1115 @Override
1116 public boolean enableInputMethodsForTextComponent() {
1117 return false;
1118 }
1119
1120 private static Locale startupLocale = null;
1121
1122 /**
1123 * Returns the locale in which the runtime was started.
1124 */
1125 public static Locale getStartupLocale() {
1126 if (startupLocale == null) {
1127 String language, region, country, variant;
1128 language = AccessController.doPrivileged(
1129 new GetPropertyAction("user.language", "en"));
1130 // for compatibility, check for old user.region property
1131 region = AccessController.doPrivileged(
1132 new GetPropertyAction("user.region"));
1133 if (region != null) {
1134 // region can be of form country, country_variant, or _variant
1135 int i = region.indexOf('_');
1136 if (i >= 0) {
1137 country = region.substring(0, i);
1138 variant = region.substring(i + 1);
1139 } else {
1140 country = region;
1141 variant = "";
1142 }
1143 } else {
1144 country = AccessController.doPrivileged(
1145 new GetPropertyAction("user.country", ""));
1146 variant = AccessController.doPrivileged(
1147 new GetPropertyAction("user.variant", ""));
1148 }
1149 startupLocale = new Locale(language, country, variant);
1150 }
1151 return startupLocale;
1152 }
1153
1154 /**
1155 * Returns the default keyboard locale of the underlying operating system
1156 */
1157 @Override
1158 public Locale getDefaultKeyboardLocale() {
1159 return getStartupLocale();
1160 }
1161
1162 private static DefaultMouseInfoPeer mPeer = null;
1163
1164 @Override
1165 public synchronized MouseInfoPeer getMouseInfoPeer() {
1166 if (mPeer == null) {
1167 mPeer = new DefaultMouseInfoPeer();
1168 }
1169 return mPeer;
1170 }
1171
1172
1173 /**
1174 * Returns whether default toolkit needs the support of the xembed
1175 * from embedding host(if any).
1176 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1177 */
1178 public static boolean needsXEmbed() {
1179 String noxembed = AccessController.
1180 doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1181 if ("true".equals(noxembed)) {
1182 return false;
1183 }
1184
1185 Toolkit tk = Toolkit.getDefaultToolkit();
1186 if (tk instanceof SunToolkit) {
1187 // SunToolkit descendants should override this method to specify
1188 // concrete behavior
1189 return ((SunToolkit)tk).needsXEmbedImpl();
1190 } else {
1191 // Non-SunToolkit doubtly might support XEmbed
1192 return false;
1193 }
1194 }
1195
1196 /**
1197 * Returns whether this toolkit needs the support of the xembed
1198 * from embedding host(if any).
1199 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1200 */
1201 protected boolean needsXEmbedImpl() {
1202 return false;
1203 }
1204
1205 private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1206
1207 /**
1208 * Returns whether the XEmbed server feature is requested by
1209 * developer. If true, Toolkit should return an
1210 * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1211 */
1212 protected final boolean isXEmbedServerRequested() {
1213 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1214 }
1215
1216 /**
1217 * Returns whether the modal exclusion API is supported by the current toolkit.
1218 * When it isn't supported, calling <code>setModalExcluded</code> has no
1219 * effect, and <code>isModalExcluded</code> returns false for all windows.
1220 *
1221 * @return true if modal exclusion is supported by the toolkit, false otherwise
1222 *
1223 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1224 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1225 *
1226 * @since 1.5
1227 */
1228 public static boolean isModalExcludedSupported()
1229 {
1230 Toolkit tk = Toolkit.getDefaultToolkit();
1231 return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1232 }
1233 /*
1234 * Default implementation for isModalExcludedSupportedImpl(), returns false.
1235 *
1236 * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1237 * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1238 *
1239 * @since 1.5
1240 */
1241 protected boolean isModalExcludedSupportedImpl()
1242 {
1243 return false;
1244 }
1245
1246 /*
1247 * Sets this window to be excluded from being modally blocked. When the
1248 * toolkit supports modal exclusion and this method is called, input
1249 * events, focus transfer and z-order will continue to work for the
1250 * window, it's owned windows and child components, even in the
1251 * presence of a modal dialog.
1252 * For details on which <code>Window</code>s are normally blocked
1253 * by modal dialog, see {@link java.awt.Dialog}.
1254 * Invoking this method when the modal exclusion API is not supported by
1255 * the current toolkit has no effect.
1256 * @param window Window to be marked as not modally blocked
1257 * @see java.awt.Dialog
1258 * @see java.awt.Dialog#setModal(boolean)
1259 * @see sun.awt.SunToolkit#isModalExcludedSupported
1260 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1261 */
1262 public static void setModalExcluded(Window window)
1263 {
1264 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1265 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1266 }
1267 window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1268 }
1269
1270 /*
1271 * Returns whether the specified window is blocked by modal dialogs.
1272 * If the modal exclusion API isn't supported by the current toolkit,
1273 * it returns false for all windows.
1274 *
1275 * @param window Window to test for modal exclusion
1276 *
1277 * @return true if the window is modal excluded, false otherwise. If
1278 * the modal exclusion isn't supported by the current Toolkit, false
1279 * is returned
1280 *
1281 * @see sun.awt.SunToolkit#isModalExcludedSupported
1282 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1283 *
1284 * @since 1.5
1285 */
1286 public static boolean isModalExcluded(Window window)
1287 {
1288 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1289 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1290 }
1291 return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1292 }
1293
1294 /**
1295 * Overridden in XToolkit and WToolkit
1296 */
1297 @Override
1298 public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1299 return (modalityType == Dialog.ModalityType.MODELESS) ||
1300 (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1301 }
1302
1303 /**
1304 * Overridden in XToolkit and WToolkit
1305 */
1306 @Override
1307 public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1308 return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1309 }
1310
1311 ///////////////////////////////////////////////////////////////////////////
1312 //
1313 // The following is used by the Java Plug-in to coordinate dialog modality
1314 // between containing applications (browsers, ActiveX containers etc) and
1315 // the AWT.
1316 //
1317 ///////////////////////////////////////////////////////////////////////////
1318
1319 private ModalityListenerList modalityListeners = new ModalityListenerList();
1320
1321 public void addModalityListener(ModalityListener listener) {
1322 modalityListeners.add(listener);
1323 }
1324
1325 public void removeModalityListener(ModalityListener listener) {
1326 modalityListeners.remove(listener);
1327 }
1328
1329 public void notifyModalityPushed(Dialog dialog) {
1330 notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1331 }
1332
1333 public void notifyModalityPopped(Dialog dialog) {
1334 notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1335 }
1336
1337 final void notifyModalityChange(int id, Dialog source) {
1338 ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1339 ev.dispatch();
1340 }
1341
1342 static class ModalityListenerList implements ModalityListener {
1343
1344 Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1345
1346 void add(ModalityListener listener) {
1347 listeners.addElement(listener);
1348 }
1349
1350 void remove(ModalityListener listener) {
1351 listeners.removeElement(listener);
1352 }
1353
1354 @Override
1355 public void modalityPushed(ModalityEvent ev) {
1356 Iterator<ModalityListener> it = listeners.iterator();
1357 while (it.hasNext()) {
1358 it.next().modalityPushed(ev);
1359 }
1360 }
1361
1362 @Override
1363 public void modalityPopped(ModalityEvent ev) {
1364 Iterator<ModalityListener> it = listeners.iterator();
1365 while (it.hasNext()) {
1366 it.next().modalityPopped(ev);
1367 }
1368 }
1369 } // end of class ModalityListenerList
1370
1371 ///////////////////////////////////////////////////////////////////////////
1372 // End Plug-in code
1373 ///////////////////////////////////////////////////////////////////////////
1374
1375 public static boolean isLightweightOrUnknown(Component comp) {
1376 if (comp.isLightweight()
1377 || !(getDefaultToolkit() instanceof SunToolkit))
1378 {
1379 return true;
1380 }
1381 return !(comp instanceof Button
1382 || comp instanceof Canvas
1383 || comp instanceof Checkbox
1384 || comp instanceof Choice
1385 || comp instanceof Label
1386 || comp instanceof java.awt.List
1387 || comp instanceof Panel
1388 || comp instanceof Scrollbar
1389 || comp instanceof ScrollPane
1390 || comp instanceof TextArea
1391 || comp instanceof TextField
1392 || comp instanceof Window);
1393 }
1394
1395 @SuppressWarnings("serial")
1396 public static class OperationTimedOut extends RuntimeException {
1397 public OperationTimedOut(String msg) {
1398 super(msg);
1399 }
1400 public OperationTimedOut() {
1401 }
1402 }
1403
1404 @SuppressWarnings("serial")
1405 public static class InfiniteLoop extends RuntimeException {
1406 }
1407
1408 @SuppressWarnings("serial")
1409 public static class IllegalThreadException extends RuntimeException {
1410 public IllegalThreadException(String msg) {
1411 super(msg);
1412 }
1413 public IllegalThreadException() {
1414 }
1415 }
1416
1417 public static final int DEFAULT_WAIT_TIME = 10000;
1418 private static final int MAX_ITERS = 20;
1419 private static final int MIN_ITERS = 0;
1420 private static final int MINIMAL_EDELAY = 0;
1421
1422 /**
1423 * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1424 */
1425 public void realSync() throws OperationTimedOut, InfiniteLoop {
1426 realSync(DEFAULT_WAIT_TIME);
1427 }
1428
1429 /**
1430 * Forces toolkit to synchronize with the native windowing
1431 * sub-system, flushing all pending work and waiting for all the
1432 * events to be processed. This method guarantees that after
1433 * return no additional Java events will be generated, unless
1434 * cause by user. Obviously, the method cannot be used on the
1435 * event dispatch thread (EDT). In case it nevertheless gets
1436 * invoked on this thread, the method throws the
1437 * IllegalThreadException runtime exception.
1438 *
1439 * <p> This method allows to write tests without explicit timeouts
1440 * or wait for some event. Example:
1441 * <code>
1442 * Frame f = ...;
1443 * f.setVisible(true);
1444 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1445 * </code>
1446 *
1447 * <p> After realSync, <code>f</code> will be completely visible
1448 * on the screen, its getLocationOnScreen will be returning the
1449 * right result and it will be the focus owner.
1450 *
1451 * <p> Another example:
1452 * <code>
1453 * b.requestFocus();
1454 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1455 * </code>
1456 *
1457 * <p> After realSync, <code>b</code> will be focus owner.
1458 *
1459 * <p> Notice that realSync isn't guaranteed to work if recurring
1460 * actions occur, such as if during processing of some event
1461 * another request which may generate some events occurs. By
1462 * default, sync tries to perform as much as {@value #MAX_ITERS}
1463 * cycles of event processing, allowing for roughly {@value
1464 * #MAX_ITERS} additional requests.
1465 *
1466 * <p> For example, requestFocus() generates native request, which
1467 * generates one or two Java focus events, which then generate a
1468 * serie of paint events, a serie of Java focus events, which then
1469 * generate a serie of paint events which then are processed -
1470 * three cycles, minimum.
1471 *
1472 * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1473 */
1474 public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1475 {
1476 if (EventQueue.isDispatchThread()) {
1477 throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1478 }
1479 int bigLoop = 0;
1480 do {
1481 // Let's do sync first
1482 sync();
1483
1484 // During the wait process, when we were processing incoming
1485 // events, we could have made some new request, which can
1486 // generate new events. Example: MapNotify/XSetInputFocus.
1487 // Therefore, we dispatch them as long as there is something
1488 // to dispatch.
1489 int iters = 0;
1490 while (iters < MIN_ITERS) {
1491 syncNativeQueue(timeout);
1492 iters++;
1493 }
1494 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1495 iters++;
1496 }
1497 if (iters >= MAX_ITERS) {
1498 throw new InfiniteLoop();
1499 }
1500
1501 // native requests were dispatched by X/Window Manager or Windows
1502 // Moreover, we processed them all on Toolkit thread
1503 // Now wait while EDT processes them.
1504 //
1505 // During processing of some events (focus, for example),
1506 // some other events could have been generated. So, after
1507 // waitForIdle, we may end up with full EventQueue
1508 iters = 0;
1509 while (iters < MIN_ITERS) {
1510 waitForIdle(timeout);
1511 iters++;
1512 }
1513 while (waitForIdle(timeout) && iters < MAX_ITERS) {
1514 iters++;
1515 }
1516 if (iters >= MAX_ITERS) {
1517 throw new InfiniteLoop();
1518 }
1519
1520 bigLoop++;
1521 // Again, for Java events, it was simple to check for new Java
1522 // events by checking event queue, but what if Java events
1523 // resulted in native requests? Therefor, check native events again.
1524 } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1525 }
1526
1527 /**
1528 * Platform toolkits need to implement this method to perform the
1529 * sync of the native queue. The method should wait until native
1530 * requests are processed, all native events are processed and
1531 * corresponding Java events are generated. Should return
1532 * <code>true</code> if some events were processed,
1533 * <code>false</code> otherwise.
1534 */
1535 protected abstract boolean syncNativeQueue(final long timeout);
1536
1537 private boolean eventDispatched = false;
1538 private boolean queueEmpty = false;
1539 private final Object waitLock = "Wait Lock";
1540
1541 private boolean isEQEmpty() {
1542 EventQueue queue = getSystemEventQueueImpl();
1543 return AWTAccessor.getEventQueueAccessor().noEvents(queue);
1544 }
1545
1546 /**
1547 * Waits for the Java event queue to empty. Ensures that all
1548 * events are processed (including paint events), and that if
1549 * recursive events were generated, they are also processed.
1550 * Should return <code>true</code> if more processing is
1551 * necessary, <code>false</code> otherwise.
1552 */
1553 @SuppressWarnings("serial")
1554 protected final boolean waitForIdle(final long timeout) {
1555 flushPendingEvents();
1556 boolean queueWasEmpty = isEQEmpty();
1557 queueEmpty = false;
1558 eventDispatched = false;
1559 synchronized(waitLock) {
1560 postEvent(AppContext.getAppContext(),
1561 new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1562 @Override
1563 public void dispatch() {
1564 // Here we block EDT. It could have some
1565 // events, it should have dispatched them by
1566 // now. So native requests could have been
1567 // generated. First, dispatch them. Then,
1568 // flush Java events again.
1569 int iters = 0;
1570 while (iters < MIN_ITERS) {
1571 syncNativeQueue(timeout);
1572 iters++;
1573 }
1574 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1575 iters++;
1576 }
1577 flushPendingEvents();
1578
1579 synchronized(waitLock) {
1580 queueEmpty = isEQEmpty();
1581 eventDispatched = true;
1582 waitLock.notifyAll();
1583 }
1584 }
1585 });
1586 try {
1587 while (!eventDispatched) {
1588 waitLock.wait();
1589 }
1590 } catch (InterruptedException ie) {
1591 return false;
1592 }
1593 }
1594
1595 try {
1596 Thread.sleep(MINIMAL_EDELAY);
1597 } catch (InterruptedException ie) {
1598 throw new RuntimeException("Interrupted");
1599 }
1600
1601 flushPendingEvents();
1602
1603 // Lock to force write-cache flush for queueEmpty.
1604 synchronized (waitLock) {
1605 return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1606 }
1607 }
1608
1609 /**
1610 * Grabs the mouse input for the given window. The window must be
1611 * visible. The window or its children do not receive any
1612 * additional mouse events besides those targeted to them. All
1613 * other events will be dispatched as before - to the respective
1614 * targets. This Window will receive UngrabEvent when automatic
1615 * ungrab is about to happen. The event can be listened to by
1616 * installing AWTEventListener with WINDOW_EVENT_MASK. See
1617 * UngrabEvent class for the list of conditions when ungrab is
1618 * about to happen.
1619 * @see UngrabEvent
1620 */
1621 public abstract void grab(Window w);
1622
1623 /**
1624 * Forces ungrab. No event will be sent.
1625 */
1626 public abstract void ungrab(Window w);
1627
1628
1629 /**
1630 * Locates the splash screen library in a platform dependent way and closes
1631 * the splash screen. Should be invoked on first top-level frame display.
1632 * @see java.awt.SplashScreen
1633 * @since 1.6
1634 */
1635 public static native void closeSplashScreen();
1636
1637 /* The following methods and variables are to support retrieving
1638 * desktop text anti-aliasing settings
1639 */
1640
1641 /* Need an instance method because setDesktopProperty(..) is protected. */
1642 private void fireDesktopFontPropertyChanges() {
1643 setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1644 SunToolkit.getDesktopFontHints());
1645 }
1646
1647 private static boolean checkedSystemAAFontSettings;
1648 private static boolean useSystemAAFontSettings;
1649 private static boolean lastExtraCondition = true;
1650 private static RenderingHints desktopFontHints;
1651
1652 /* Since Swing is the reason for this "extra condition" logic its
1653 * worth documenting it in some detail.
1654 * First, a goal is for Swing and applications to both retrieve and
1655 * use the same desktop property value so that there is complete
1656 * consistency between the settings used by JDK's Swing implementation
1657 * and 3rd party custom Swing components, custom L&Fs and any general
1658 * text rendering that wants to be consistent with these.
1659 * But by default on Solaris & Linux Swing will not use AA text over
1660 * remote X11 display (unless Xrender can be used which is TBD and may not
1661 * always be available anyway) as that is a noticeable performance hit.
1662 * So there needs to be a way to express that extra condition so that
1663 * it is seen by all clients of the desktop property API.
1664 * If this were the only condition it could be handled here as it would
1665 * be the same for any L&F and could reasonably be considered to be
1666 * a static behaviour of those systems.
1667 * But GTK currently has an additional test based on locale which is
1668 * not applied by Metal. So mixing GTK in a few locales with Metal
1669 * would mean the last one wins.
1670 * This could be stored per-app context which would work
1671 * for different applets, but wouldn't help for a single application
1672 * using GTK and some other L&F concurrently.
1673 * But it is expected this will be addressed within GTK and the font
1674 * system so is a temporary and somewhat unlikely harmless corner case.
1675 */
1676 public static void setAAFontSettingsCondition(boolean extraCondition) {
1677 if (extraCondition != lastExtraCondition) {
1678 lastExtraCondition = extraCondition;
1679 if (checkedSystemAAFontSettings) {
1680 /* Someone already asked for this info, under a different
1681 * condition.
1682 * We'll force re-evaluation instead of replicating the
1683 * logic, then notify any listeners of any change.
1684 */
1685 checkedSystemAAFontSettings = false;
1686 Toolkit tk = Toolkit.getDefaultToolkit();
1687 if (tk instanceof SunToolkit) {
1688 ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1689 }
1690 }
1691 }
1692 }
1693
1694 /* "false", "off", ""default" aren't explicitly tested, they
1695 * just fall through to produce a null return which all are equated to
1696 * "false".
1697 */
1698 private static RenderingHints getDesktopAAHintsByName(String hintname) {
1699 Object aaHint = null;
1700 hintname = hintname.toLowerCase(Locale.ENGLISH);
1701 if (hintname.equals("on")) {
1702 aaHint = VALUE_TEXT_ANTIALIAS_ON;
1703 } else if (hintname.equals("gasp")) {
1704 aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1705 } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1706 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1707 } else if (hintname.equals("lcd_hbgr")) {
1708 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1709 } else if (hintname.equals("lcd_vrgb")) {
1710 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1711 } else if (hintname.equals("lcd_vbgr")) {
1712 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1713 }
1714 if (aaHint != null) {
1715 RenderingHints map = new RenderingHints(null);
1716 map.put(KEY_TEXT_ANTIALIASING, aaHint);
1717 return map;
1718 } else {
1719 return null;
1720 }
1721 }
1722
1723 /* This method determines whether to use the system font settings,
1724 * or ignore them if a L&F has specified they should be ignored, or
1725 * to override both of these with a system property specified value.
1726 * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1727 * system property isn't applied as desktop properties are considered
1728 * to be inapplicable in that case. In that headless case although
1729 * this method will return "true" the toolkit will return a null map.
1730 */
1731 private static boolean useSystemAAFontSettings() {
1732 if (!checkedSystemAAFontSettings) {
1733 useSystemAAFontSettings = true; /* initially set this true */
1734 String systemAAFonts = null;
1735 Toolkit tk = Toolkit.getDefaultToolkit();
1736 if (tk instanceof SunToolkit) {
1737 systemAAFonts =
1738 AccessController.doPrivileged(
1739 new GetPropertyAction("awt.useSystemAAFontSettings"));
1740 }
1741 if (systemAAFonts != null) {
1742 useSystemAAFontSettings =
1743 Boolean.valueOf(systemAAFonts).booleanValue();
1744 /* If it is anything other than "true", then it may be
1745 * a hint name , or it may be "off, "default", etc.
1746 */
1747 if (!useSystemAAFontSettings) {
1748 desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1749 }
1750 }
1751 /* If its still true, apply the extra condition */
1752 if (useSystemAAFontSettings) {
1753 useSystemAAFontSettings = lastExtraCondition;
1754 }
1755 checkedSystemAAFontSettings = true;
1756 }
1757 return useSystemAAFontSettings;
1758 }
1759
1760 /* A variable defined for the convenience of JDK code */
1761 public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1762
1763 /* Overridden by subclasses to return platform/desktop specific values */
1764 protected RenderingHints getDesktopAAHints() {
1765 return null;
1766 }
1767
1768 /* Subclass desktop property loading methods call this which
1769 * in turn calls the appropriate subclass implementation of
1770 * getDesktopAAHints() when system settings are being used.
1771 * Its public rather than protected because subclasses may delegate
1772 * to a helper class.
1773 */
1774 public static RenderingHints getDesktopFontHints() {
1775 if (useSystemAAFontSettings()) {
1776 Toolkit tk = Toolkit.getDefaultToolkit();
1777 if (tk instanceof SunToolkit) {
1778 Object map = ((SunToolkit)tk).getDesktopAAHints();
1779 return (RenderingHints)map;
1780 } else { /* Headless Toolkit */
1781 return null;
1782 }
1783 } else if (desktopFontHints != null) {
1784 /* cloning not necessary as the return value is cloned later, but
1785 * its harmless.
1786 */
1787 return (RenderingHints)(desktopFontHints.clone());
1788 } else {
1789 return null;
1790 }
1791 }
1792
1793
1794 public abstract boolean isDesktopSupported();
1795
1796 /*
1797 * consumeNextKeyTyped() method is not currently used,
1798 * however Swing could use it in the future.
1799 */
1800 public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1801 try {
1802 AWTAccessor.getDefaultKeyboardFocusManagerAccessor().consumeNextKeyTyped(
1803 (DefaultKeyboardFocusManager)KeyboardFocusManager.
1804 getCurrentKeyboardFocusManager(),
1805 keyEvent);
1806 } catch (ClassCastException cce) {
1807 cce.printStackTrace();
1808 }
1809 }
1810
1811 protected static void dumpPeers(final PlatformLogger aLog) {
1812 AWTAutoShutdown.getInstance().dumpPeers(aLog);
1813 }
1814
1815 /**
1816 * Returns the <code>Window</code> ancestor of the component <code>comp</code>.
1817 * @return Window ancestor of the component or component by itself if it is Window;
1818 * null, if component is not a part of window hierarchy
1819 */
1820 public static Window getContainingWindow(Component comp) {
1821 while (comp != null && !(comp instanceof Window)) {
1822 comp = comp.getParent();
1823 }
1824 return (Window)comp;
1825 }
1826
1827 private static Boolean sunAwtDisableMixing = null;
1828
1829 /**
1830 * Returns the value of "sun.awt.disableMixing" property. Default
1831 * value is {@code false}.
1832 */
1833 public synchronized static boolean getSunAwtDisableMixing() {
1834 if (sunAwtDisableMixing == null) {
1835 sunAwtDisableMixing = AccessController.doPrivileged(
1836 new GetBooleanAction("sun.awt.disableMixing"));
1837 }
1838 return sunAwtDisableMixing.booleanValue();
1839 }
1840
1841 /**
1842 * Returns true if the native GTK libraries are available. The
1843 * default implementation returns false, but UNIXToolkit overrides this
1844 * method to provide a more specific answer.
1845 */
1846 public boolean isNativeGTKAvailable() {
1847 return false;
1848 }
1849
1850 private static final Object DEACTIVATION_TIMES_MAP_KEY = new Object();
1851
1852 public synchronized void setWindowDeactivationTime(Window w, long time) {
1853 AppContext ctx = getAppContext(w);
1854 if (ctx == null) {
1855 return;
1856 }
1857 @SuppressWarnings("unchecked")
1858 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1859 if (map == null) {
1860 map = new WeakHashMap<Window, Long>();
1861 ctx.put(DEACTIVATION_TIMES_MAP_KEY, map);
1862 }
1863 map.put(w, time);
1864 }
1865
1866 public synchronized long getWindowDeactivationTime(Window w) {
1867 AppContext ctx = getAppContext(w);
1868 if (ctx == null) {
1869 return -1;
1870 }
1871 @SuppressWarnings("unchecked")
1872 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1873 if (map == null) {
1874 return -1;
1875 }
1876 Long time = map.get(w);
1877 return time == null ? -1 : time;
1878 }
1879
1880 // Cosntant alpha
1881 public boolean isWindowOpacitySupported() {
1882 return false;
1883 }
1884
1885 // Shaping
1886 public boolean isWindowShapingSupported() {
1887 return false;
1888 }
1889
1890 // Per-pixel alpha
1891 public boolean isWindowTranslucencySupported() {
1892 return false;
1893 }
1894
1895 public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1896 return false;
1897 }
1898
1899 /**
1900 * Returns true if swing backbuffer should be translucent.
1901 */
1902 public boolean isSwingBackbufferTranslucencySupported() {
1903 return false;
1904 }
1905
1906 /**
1907 * Returns whether or not a containing top level window for the passed
1908 * component is
1909 * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1910 *
1911 * @param c a Component which toplevel's to check
1912 * @return {@code true} if the passed component is not null and has a
1913 * containing toplevel window which is opaque (so per-pixel translucency
1914 * is not enabled), {@code false} otherwise
1915 * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1916 */
1917 public static boolean isContainingTopLevelOpaque(Component c) {
1918 Window w = getContainingWindow(c);
1919 return w != null && w.isOpaque();
1920 }
1921
1922 /**
1923 * Returns whether or not a containing top level window for the passed
1924 * component is
1925 * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1926 *
1927 * @param c a Component which toplevel's to check
1928 * @return {@code true} if the passed component is not null and has a
1929 * containing toplevel window which has opacity less than
1930 * 1.0f (which means that it is translucent), {@code false} otherwise
1931 * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1932 */
1933 public static boolean isContainingTopLevelTranslucent(Component c) {
1934 Window w = getContainingWindow(c);
1935 return w != null && w.getOpacity() < 1.0f;
1936 }
1937
1938 /**
1939 * Returns whether the native system requires using the peer.updateWindow()
1940 * method to update the contents of a non-opaque window, or if usual
1941 * painting procedures are sufficient. The default return value covers
1942 * the X11 systems. On MS Windows this method is overriden in WToolkit
1943 * to return true.
1944 */
1945 public boolean needUpdateWindow() {
1946 return false;
1947 }
1948
1949 /**
1950 * Descendants of the SunToolkit should override and put their own logic here.
1951 */
1952 public int getNumberOfButtons(){
1953 return 3;
1954 }
1955
1956 /**
1957 * Checks that the given object implements/extends the given
1958 * interface/class.
1959 *
1960 * Note that using the instanceof operator causes a class to be loaded.
1961 * Using this method doesn't load a class and it can be used instead of
1962 * the instanceof operator for performance reasons.
1963 *
1964 * @param obj Object to be checked
1965 * @param type The name of the interface/class. Must be
1966 * fully-qualified interface/class name.
1967 * @return true, if this object implements/extends the given
1968 * interface/class, false, otherwise, or if obj or type is null
1969 */
1970 public static boolean isInstanceOf(Object obj, String type) {
1971 if (obj == null) return false;
1972 if (type == null) return false;
1973
1974 return isInstanceOf(obj.getClass(), type);
1975 }
1976
1977 private static boolean isInstanceOf(Class<?> cls, String type) {
1978 if (cls == null) return false;
1979
1980 if (cls.getName().equals(type)) {
1981 return true;
1982 }
1983
1984 for (Class<?> c : cls.getInterfaces()) {
1985 if (c.getName().equals(type)) {
1986 return true;
1987 }
1988 }
1989 return isInstanceOf(cls.getSuperclass(), type);
1990 }
1991
1992 protected static LightweightFrame getLightweightFrame(Component c) {
1993 for (; c != null; c = c.getParent()) {
1994 if (c instanceof LightweightFrame) {
1995 return (LightweightFrame)c;
1996 }
1997 if (c instanceof Window) {
1998 // Don't traverse owner windows
1999 return null;
2000 }
2001 }
2002 return null;
2003 }
2004
2005 ///////////////////////////////////////////////////////////////////////////
2006 //
2007 // The following methods help set and identify whether a particular
2008 // AWTEvent object was produced by the system or by user code. As of this
2009 // writing the only consumer is the Java Plug-In, although this information
2010 // could be useful to more clients and probably should be formalized in
2011 // the public API.
2012 //
2013 ///////////////////////////////////////////////////////////////////////////
2014
2015 public static void setSystemGenerated(AWTEvent e) {
2016 AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2017 }
2018
2019 public static boolean isSystemGenerated(AWTEvent e) {
2020 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2021 }
2022
2023 } // class SunToolkit
2024
2025
2026 /*
2027 * PostEventQueue is a Thread that runs in the same AppContext as the
2028 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2029 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2030 * events to this queue, which then calls EventQueue.postEvent().
2031 *
2032 * We do this because EventQueue.postEvent() may be overridden by client
2033 * code, and we mustn't ever call client code from the toolkit thread.
2034 */
2035 class PostEventQueue {
2036 private EventQueueItem queueHead = null;
2037 private EventQueueItem queueTail = null;
2038 private final EventQueue eventQueue;
2039
2040 private Thread flushThread = null;
2041
2042 PostEventQueue(EventQueue eq) {
2043 eventQueue = eq;
2044 }
2045
2046 /*
2047 * Continually post pending AWTEvents to the Java EventQueue. The method
2048 * is synchronized to ensure the flush is completed before a new event
2049 * can be posted to this queue.
2050 *
2051 * 7177040: The method couldn't be wholly synchronized because of calls
2052 * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2053 * potentially lead to deadlock
2054 */
2055 public void flush() {
2056
2057 Thread newThread = Thread.currentThread();
2058
2059 try {
2060 EventQueueItem tempQueue;
2061 synchronized (this) {
2062 // Avoid method recursion
2063 if (newThread == flushThread) {
2064 return;
2065 }
2066 // Wait for other threads' flushing
2067 while (flushThread != null) {
2068 wait();
2069 }
2070 // Skip everything if queue is empty
2071 if (queueHead == null) {
2072 return;
2073 }
2074 // Remember flushing thread
2075 flushThread = newThread;
2076
2077 tempQueue = queueHead;
2078 queueHead = queueTail = null;
2079 }
2080 try {
2081 while (tempQueue != null) {
2082 eventQueue.postEvent(tempQueue.event);
2083 tempQueue = tempQueue.next;
2084 }
2085 }
2086 finally {
2087 // Only the flushing thread can get here
2088 synchronized (this) {
2089 // Forget flushing thread, inform other pending threads
2090 flushThread = null;
2091 notifyAll();
2092 }
2093 }
2094 }
2095 catch (InterruptedException e) {
2096 // Couldn't allow exception go up, so at least recover the flag
2097 newThread.interrupt();
2098 }
2099 }
2100
2101 /*
2102 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2103 */
2104 void postEvent(AWTEvent event) {
2105 EventQueueItem item = new EventQueueItem(event);
2106
2107 synchronized (this) {
2108 if (queueHead == null) {
2109 queueHead = queueTail = item;
2110 } else {
2111 queueTail.next = item;
2112 queueTail = item;
2113 }
2114 }
2115 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2116 }
2117 } // class PostEventQueue