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.SystemTrayPeer;
41 import java.awt.peer.TrayIconPeer;
42 import java.io.File;
43 import java.io.IOException;
44 import java.io.InputStream;
45 import java.lang.reflect.InvocationTargetException;
46 import java.net.URL;
47 import java.security.AccessController;
48 import java.util.Collections;
49 import java.util.Iterator;
50 import java.util.Locale;
51 import java.util.Map;
52 import java.util.Vector;
53 import java.util.WeakHashMap;
54 import java.util.concurrent.TimeUnit;
55 import java.util.concurrent.locks.Condition;
56 import java.util.concurrent.locks.ReentrantLock;
57
58 import sun.awt.im.InputContext;
59 import sun.awt.image.ByteArrayImageSource;
60 import sun.awt.image.FileImageSource;
61 import sun.awt.image.ImageRepresentation;
62 import java.awt.image.MultiResolutionImage;
63 import sun.awt.image.MultiResolutionToolkitImage;
64 import sun.awt.image.ToolkitImage;
65 import sun.awt.image.URLImageSource;
66 import sun.font.FontDesignMetrics;
67 import sun.misc.SoftCache;
68 import sun.net.util.URLUtil;
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 import java.awt.image.ResolutionVariantItem;
75 import java.util.Arrays;
76 import java.util.List;
77
78 public abstract class SunToolkit extends Toolkit
79 implements ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
80
81 // 8014718: logging has been removed from SunToolkit
82
83 /* Load debug settings for native code */
84 static {
85 if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
86 DebugSettings.init();
87 }
88 };
89
90 /**
91 * Special mask for the UngrabEvent events, in addition to the
92 * public masks defined in AWTEvent. Should be used as the mask
93 * value for Toolkit.addAWTEventListener.
94 */
95 public static final int GRAB_EVENT_MASK = 0x80000000;
96
97 /* The key to put()/get() the PostEventQueue into/from the AppContext.
98 */
99 private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
100
101 /**
102 * Number of buttons.
103 * By default it's taken from the system. If system value does not
104 * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
105 */
106 protected static int numberOfButtons = 0;
107
108
109 /* XFree standard mention 24 buttons as maximum:
110 * http://www.xfree86.org/current/mouse.4.html
111 * We workaround systems supporting more than 24 buttons.
112 * Otherwise, we have to use long type values as masks
113 * which leads to API change.
114 * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
115 * the 4-bytes limit for the int type. (CR 6799099)
116 * One more bit is reserved for FIRST_HIGH_BIT.
117 */
118 public static final int MAX_BUTTONS_SUPPORTED = 20;
119
120 /**
121 * Creates and initializes EventQueue instance for the specified
122 * AppContext.
123 * Note that event queue must be created from createNewAppContext()
124 * only in order to ensure that EventQueue constructor obtains
125 * the correct AppContext.
126 * @param appContext AppContext to associate with the event queue
127 */
128 private static void initEQ(AppContext appContext) {
129 EventQueue eventQueue = new EventQueue();
130 appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
131
132 PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
133 appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
134 }
135
136 public SunToolkit() {
137 }
138
139 public boolean useBufferPerWindow() {
140 return false;
141 }
142
143 public abstract FramePeer createLightweightFrame(LightweightFrame target)
144 throws HeadlessException;
145
146 public abstract TrayIconPeer createTrayIcon(TrayIcon target)
147 throws HeadlessException, AWTException;
148
149 public abstract SystemTrayPeer createSystemTray(SystemTray target);
150
151 public abstract boolean isTraySupported();
152
153 @Override
154 public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
155 throws HeadlessException;
156
157 /**
158 * The AWT lock is typically only used on Unix platforms to synchronize
159 * access to Xlib, OpenGL, etc. However, these methods are implemented
160 * in SunToolkit so that they can be called from shared code (e.g.
161 * from the OGL pipeline) or from the X11 pipeline regardless of whether
162 * XToolkit or MToolkit is currently in use. There are native macros
163 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
164 * methods is changed, make sure it is compatible with the native macros.
165 *
166 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
167 * used in place of:
168 * synchronized (getAWTLock()) {
169 * ...
170 * }
171 *
172 * By factoring these methods out specially, we are able to change the
173 * implementation of these methods (e.g. use more advanced locking
174 * mechanisms) without impacting calling code.
175 *
176 * Sample usage:
177 * private void doStuffWithXlib() {
178 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
179 * SunToolkit.awtLock();
180 * try {
181 * ...
182 * XlibWrapper.XDoStuff();
183 * } finally {
184 * SunToolkit.awtUnlock();
185 * }
186 * }
187 */
188
189 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
190 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
191
192 public static final void awtLock() {
193 AWT_LOCK.lock();
194 }
195
196 public static final boolean awtTryLock() {
197 return AWT_LOCK.tryLock();
198 }
199
200 public static final void awtUnlock() {
201 AWT_LOCK.unlock();
202 }
203
204 public static final void awtLockWait()
205 throws InterruptedException
206 {
207 AWT_LOCK_COND.await();
208 }
209
210 public static final void awtLockWait(long timeout)
211 throws InterruptedException
212 {
213 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
214 }
215
216 public static final void awtLockNotify() {
217 AWT_LOCK_COND.signal();
218 }
219
220 public static final void awtLockNotifyAll() {
221 AWT_LOCK_COND.signalAll();
222 }
223
224 public static final boolean isAWTLockHeldByCurrentThread() {
225 return AWT_LOCK.isHeldByCurrentThread();
226 }
227
228 /*
229 * Create a new AppContext, along with its EventQueue, for a
230 * new ThreadGroup. Browser code, for example, would use this
231 * method to create an AppContext & EventQueue for an Applet.
232 */
233 public static AppContext createNewAppContext() {
234 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
235 return createNewAppContext(threadGroup);
236 }
237
238 static final AppContext createNewAppContext(ThreadGroup threadGroup) {
239 // Create appContext before initialization of EventQueue, so all
240 // the calls to AppContext.getAppContext() from EventQueue ctor
241 // return correct values
242 AppContext appContext = new AppContext(threadGroup);
243 initEQ(appContext);
244
245 return appContext;
246 }
247
248 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
249 AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
250 }
251
252 /*
253 * Fetch the peer associated with the given target (as specified
254 * in the peer creation method). This can be used to determine
255 * things like what the parent peer is. If the target is null
256 * or the target can't be found (either because the a peer was
257 * never created for it or the peer was disposed), a null will
258 * be returned.
259 */
260 protected static Object targetToPeer(Object target) {
261 if (target != null && !GraphicsEnvironment.isHeadless()) {
262 return AWTAutoShutdown.getInstance().getPeer(target);
263 }
264 return null;
265 }
266
267 protected static void targetCreatedPeer(Object target, Object peer) {
268 if (target != null && peer != null &&
269 !GraphicsEnvironment.isHeadless())
270 {
271 AWTAutoShutdown.getInstance().registerPeer(target, peer);
272 }
273 }
274
275 protected static void targetDisposedPeer(Object target, Object peer) {
276 if (target != null && peer != null &&
277 !GraphicsEnvironment.isHeadless())
278 {
279 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
280 }
281 }
282
283 // Maps from non-Component/MenuComponent to AppContext.
284 // WeakHashMap<Component,AppContext>
285 private static final Map<Object, AppContext> appContextMap =
286 Collections.synchronizedMap(new WeakIdentityHashMap<Object, AppContext>());
287
288 /**
289 * Sets the appContext field of target. If target is not a Component or
290 * MenuComponent, this returns false.
291 */
292 private static boolean setAppContext(Object target,
293 AppContext context) {
294 if (target instanceof Component) {
295 AWTAccessor.getComponentAccessor().
296 setAppContext((Component)target, context);
297 } else if (target instanceof MenuComponent) {
298 AWTAccessor.getMenuComponentAccessor().
299 setAppContext((MenuComponent)target, context);
300 } else {
301 return false;
302 }
303 return true;
304 }
305
306 /**
307 * Returns the appContext field for target. If target is not a
308 * Component or MenuComponent this returns null.
309 */
310 private static AppContext getAppContext(Object target) {
311 if (target instanceof Component) {
312 return AWTAccessor.getComponentAccessor().
313 getAppContext((Component)target);
314 } else if (target instanceof MenuComponent) {
315 return AWTAccessor.getMenuComponentAccessor().
316 getAppContext((MenuComponent)target);
317 } else {
318 return null;
319 }
320 }
321
322 /*
323 * Fetch the AppContext associated with the given target.
324 * This can be used to determine things like which EventQueue
325 * to use for posting events to a Component. If the target is
326 * null or the target can't be found, a null with be returned.
327 */
328 public static AppContext targetToAppContext(Object target) {
329 if (target == null) {
330 return null;
331 }
332 AppContext context = getAppContext(target);
333 if (context == null) {
334 // target is not a Component/MenuComponent, try the
335 // appContextMap.
336 context = appContextMap.get(target);
337 }
338 return context;
339 }
340
341 /**
342 * Sets the synchronous status of focus requests on lightweight
343 * components in the specified window to the specified value.
344 * If the boolean parameter is {@code true} then the focus
345 * requests on lightweight components will be performed
346 * synchronously, if it is {@code false}, then asynchronously.
347 * By default, all windows have their lightweight request status
348 * set to asynchronous.
349 * <p>
350 * The application can only set the status of lightweight focus
351 * requests to synchronous for any of its windows if it doesn't
352 * perform focus transfers between different heavyweight containers.
353 * In this case the observable focus behaviour is the same as with
354 * asynchronous status.
355 * <p>
356 * If the application performs focus transfer between different
357 * heavyweight containers and sets the lightweight focus request
358 * status to synchronous for any of its windows, then further focus
359 * behaviour is unspecified.
360 * <p>
361 * @param changed the window for which the lightweight focus request
362 * status should be set
363 * @param status the value of lightweight focus request status
364 */
365
366 public static void setLWRequestStatus(Window changed,boolean status){
367 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
368 };
369
370 public static void checkAndSetPolicy(Container cont) {
371 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
372 getCurrentKeyboardFocusManager().
373 getDefaultFocusTraversalPolicy();
374
375 cont.setFocusTraversalPolicy(defaultPolicy);
376 }
377
378 private static FocusTraversalPolicy createLayoutPolicy() {
379 FocusTraversalPolicy policy = null;
380 try {
381 Class<?> layoutPolicyClass =
382 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
383 policy = (FocusTraversalPolicy)layoutPolicyClass.newInstance();
384 }
385 catch (ClassNotFoundException e) {
386 assert false;
387 }
388 catch (InstantiationException e) {
389 assert false;
390 }
391 catch (IllegalAccessException e) {
392 assert false;
393 }
394
395 return policy;
396 }
397
398 /*
399 * Insert a mapping from target to AppContext, for later retrieval
400 * via targetToAppContext() above.
401 */
402 public static void insertTargetMapping(Object target, AppContext appContext) {
403 if (!setAppContext(target, appContext)) {
404 // Target is not a Component/MenuComponent, use the private Map
405 // instead.
406 appContextMap.put(target, appContext);
407 }
408 }
409
410 /*
411 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
412 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
413 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
414 * not be called under another lock since it locks the EventQueue.
415 * See bugids 4632918, 4526597.
416 */
417 public static void postEvent(AppContext appContext, AWTEvent event) {
418 if (event == null) {
419 throw new NullPointerException();
420 }
421
422 AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
423 if (sea != null && sea.isSequencedEvent(event)) {
424 AWTEvent nested = sea.getNested(event);
425 if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
426 nested instanceof TimedWindowEvent)
427 {
428 TimedWindowEvent twe = (TimedWindowEvent)nested;
429 ((SunToolkit)Toolkit.getDefaultToolkit()).
430 setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
431 }
432 }
433
434 // All events posted via this method are system-generated.
435 // Placing the following call here reduces considerably the
436 // number of places throughout the toolkit that would
437 // otherwise have to be modified to precisely identify
438 // system-generated events.
439 setSystemGenerated(event);
440 AppContext eventContext = targetToAppContext(event.getSource());
441 if (eventContext != null && !eventContext.equals(appContext)) {
442 throw new RuntimeException("Event posted on wrong app context : " + event);
443 }
444 PostEventQueue postEventQueue =
445 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
446 if (postEventQueue != null) {
447 postEventQueue.postEvent(event);
448 }
449 }
450
451 /*
452 * Post AWTEvent of high priority.
453 */
454 public static void postPriorityEvent(final AWTEvent e) {
455 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
456 @Override
457 public void run() {
458 AWTAccessor.getAWTEventAccessor().setPosted(e);
459 ((Component)e.getSource()).dispatchEvent(e);
460 }
461 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
462 postEvent(targetToAppContext(e.getSource()), pe);
463 }
464
465 /*
466 * Flush any pending events which haven't been posted to the AWT
467 * EventQueue yet.
468 */
469 public static void flushPendingEvents() {
470 AppContext appContext = AppContext.getAppContext();
471 flushPendingEvents(appContext);
472 }
473
474 /*
475 * Flush the PostEventQueue for the right AppContext.
476 * The default flushPendingEvents only flushes the thread-local context,
477 * which is not always correct, c.f. 3746956
478 */
479 public static void flushPendingEvents(AppContext appContext) {
480 PostEventQueue postEventQueue =
481 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
482 if (postEventQueue != null) {
483 postEventQueue.flush();
484 }
485 }
486
487 /*
488 * Execute a chunk of code on the Java event handler thread for the
489 * given target. Does not wait for the execution to occur before
490 * returning to the caller.
491 */
492 public static void executeOnEventHandlerThread(Object target,
493 Runnable runnable) {
494 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
495 }
496
497 /*
498 * Fixed 5064013: the InvocationEvent time should be equals
499 * the time of the ActionEvent
500 */
501 @SuppressWarnings("serial")
502 public static void executeOnEventHandlerThread(Object target,
503 Runnable runnable,
504 final long when) {
505 executeOnEventHandlerThread(
506 new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT) {
507 @Override
508 public long getWhen() {
509 return when;
510 }
511 });
512 }
513
514 /*
515 * Execute a chunk of code on the Java event handler thread for the
516 * given target. Does not wait for the execution to occur before
517 * returning to the caller.
518 */
519 public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
520 postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
521 }
522
523 /*
524 * Execute a chunk of code on the Java event handler thread. The
525 * method takes into account provided AppContext and sets
526 * {@code SunToolkit.getDefaultToolkit()} as a target of the
527 * event. See 6451487 for detailes.
528 * Does not wait for the execution to occur before returning to
529 * the caller.
530 */
531 public static void invokeLaterOnAppContext(
532 AppContext appContext, Runnable dispatcher)
533 {
534 postEvent(appContext,
535 new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
536 PeerEvent.PRIORITY_EVENT));
537 }
538
539 /*
540 * Execute a chunk of code on the Java event handler thread for the
541 * given target. Waits for the execution to occur before returning
542 * to the caller.
543 */
544 public static void executeOnEDTAndWait(Object target, Runnable runnable)
545 throws InterruptedException, InvocationTargetException
546 {
547 if (EventQueue.isDispatchThread()) {
548 throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
549 }
550
551 class AWTInvocationLock {}
552 Object lock = new AWTInvocationLock();
553
554 PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
555
556 synchronized (lock) {
557 executeOnEventHandlerThread(event);
558 while(!event.isDispatched()) {
559 lock.wait();
560 }
561 }
562
563 Throwable eventThrowable = event.getThrowable();
564 if (eventThrowable != null) {
565 throw new InvocationTargetException(eventThrowable);
566 }
567 }
568
569 /*
570 * Returns true if the calling thread is the event dispatch thread
571 * contained within AppContext which associated with the given target.
572 * Use this call to ensure that a given task is being executed
573 * (or not being) on the event dispatch thread for the given target.
574 */
575 public static boolean isDispatchThreadForAppContext(Object target) {
576 AppContext appContext = targetToAppContext(target);
577 EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
578
579 AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
580 return accessor.isDispatchThreadImpl(eq);
581 }
582
583 @Override
584 public Dimension getScreenSize() {
585 return new Dimension(getScreenWidth(), getScreenHeight());
586 }
587 protected abstract int getScreenWidth();
588 protected abstract int getScreenHeight();
589
590 @Override
591 @SuppressWarnings("deprecation")
592 public FontMetrics getFontMetrics(Font font) {
593 return FontDesignMetrics.getMetrics(font);
594 }
595
596 @Override
597 @SuppressWarnings("deprecation")
598 public String[] getFontList() {
599 String[] hardwiredFontList = {
600 Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
601 Font.DIALOG_INPUT
602
603 // -- Obsolete font names from 1.0.2. It was decided that
604 // -- getFontList should not return these old names:
605 // "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
606 };
607 return hardwiredFontList;
608 }
609
610 /**
611 * Disables erasing of background on the canvas before painting if
612 * this is supported by the current toolkit. It is recommended to
613 * call this method early, before the Canvas becomes displayable,
614 * because some Toolkit implementations do not support changing
615 * this property once the Canvas becomes displayable.
616 */
617 public void disableBackgroundErase(Canvas canvas) {
618 disableBackgroundEraseImpl(canvas);
619 }
620
621 /**
622 * Disables the native erasing of the background on the given
623 * component before painting if this is supported by the current
624 * toolkit. This only has an effect for certain components such as
625 * Canvas, Panel and Window. It is recommended to call this method
626 * early, before the Component becomes displayable, because some
627 * Toolkit implementations do not support changing this property
628 * once the Component becomes displayable.
629 */
630 public void disableBackgroundErase(Component component) {
631 disableBackgroundEraseImpl(component);
632 }
633
634 private void disableBackgroundEraseImpl(Component component) {
635 AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
636 }
637
638 /**
639 * Returns the value of "sun.awt.noerasebackground" property. Default
640 * value is {@code false}.
641 */
642 public static boolean getSunAwtNoerasebackground() {
643 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
644 }
645
646 /**
647 * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
648 * value is {@code false}.
649 */
650 public static boolean getSunAwtErasebackgroundonresize() {
651 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
652 }
653
654
655 @SuppressWarnings("deprecation")
656 static final SoftCache fileImgCache = new SoftCache();
657
658 @SuppressWarnings("deprecation")
659 static final SoftCache urlImgCache = new SoftCache();
660
661 static Image getImageFromHash(Toolkit tk, URL url) {
662 checkPermissions(url);
663 synchronized (urlImgCache) {
664 String key = url.toString();
665 Image img = (Image)urlImgCache.get(key);
666 if (img == null) {
667 try {
668 img = tk.createImage(new URLImageSource(url));
669 urlImgCache.put(key, img);
670 } catch (Exception e) {
671 }
672 }
673 return img;
674 }
675 }
676
677 static Image getImageFromHash(Toolkit tk,
678 String filename) {
679 checkPermissions(filename);
680 synchronized (fileImgCache) {
681 Image img = (Image)fileImgCache.get(filename);
682 if (img == null) {
683 try {
684 img = tk.createImage(new FileImageSource(filename));
685 fileImgCache.put(filename, img);
686 } catch (Exception e) {
687 }
688 }
689 return img;
690 }
691 }
692
693 @Override
694 public Image getImage(String filename) {
695 return getImageFromHash(this, filename);
696 }
697
698 @Override
699 public Image getImage(URL url) {
700 return getImageFromHash(this, url);
701 }
702
703 protected Image getImageWithResolutionVariant(String fileName,
704 String resolutionVariantName) {
705 synchronized (fileImgCache) {
706 Image image = getImageFromHash(this, fileName);
707 if (image instanceof MultiResolutionImage) {
708 return image;
709 }
710 Image resolutionVariant = getImageFromHash(this, resolutionVariantName);
711 image = createImageWithResolutionVariant(image, resolutionVariant);
712 fileImgCache.put(fileName, image);
713 return image;
714 }
715 }
716
717 protected Image getImageWithResolutionVariant(URL url,
718 URL resolutionVariantURL) {
719 synchronized (urlImgCache) {
720 Image image = getImageFromHash(this, url);
721 if (image instanceof MultiResolutionImage) {
722 return image;
723 }
724 Image resolutionVariant = getImageFromHash(this, resolutionVariantURL);
725 image = createImageWithResolutionVariant(image, resolutionVariant);
726 String key = url.toString();
727 urlImgCache.put(key, image);
728 return image;
729 }
730 }
731
732
733 @Override
734 public Image createImage(String filename) {
735 checkPermissions(filename);
736 return createImage(new FileImageSource(filename));
737 }
738
739 @Override
740 public Image createImage(URL url) {
741 checkPermissions(url);
742 return createImage(new URLImageSource(url));
743 }
744
745 @Override
746 public Image createImage(byte[] data, int offset, int length) {
747 return createImage(new ByteArrayImageSource(data, offset, length));
748 }
749
750 @Override
751 public Image createImage(ImageProducer producer) {
752 return (producer.isMultiResolutionImageProducer())
753 ? new MultiResolutionToolkitImage(producer)
754 : new ToolkitImage(producer);
755 }
756
757 public static Image createImageWithResolutionVariant(Image image,
758 Image resolutionVariant)
759 {
760 return new MultiResolutionToolkitImage(Arrays.asList(
761 new ResolutionVariantItem<>((ToolkitImage) image, 1, 1),
762 new ResolutionVariantItem<>((ToolkitImage) resolutionVariant, 2, 2)
763 ));
764 }
765
766 @Override
767 public int checkImage(Image img, int w, int h, ImageObserver o) {
768 if (!(img instanceof ToolkitImage)) {
769 return ImageObserver.ALLBITS;
770 }
771
772 ToolkitImage tkimg = (ToolkitImage)img;
773 int repbits;
774 if (w == 0 || h == 0) {
775 repbits = ImageObserver.ALLBITS;
776 } else {
777 repbits = tkimg.getImageRep().check(o);
778 }
779 return (tkimg.check(o) | repbits) & checkResolutionVariants(img, w, h, o);
780 }
781
782 @Override
783 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
784 if (w == 0 || h == 0) {
785 return true;
786 }
787
788 // Must be a ToolkitImage
789 if (!(img instanceof ToolkitImage)) {
790 return true;
791 }
792
793 ToolkitImage tkimg = (ToolkitImage)img;
794 if (tkimg.hasError()) {
795 if (o != null) {
796 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
797 -1, -1, -1, -1);
798 }
799 return false;
800 }
801 ImageRepresentation ir = tkimg.getImageRep();
802 return ir.prepare(o) & prepareResolutionVariants(img, w, h, o);
803 }
804
805 private int checkResolutionVariants(Image img, int w, int h, ImageObserver o) {
806 if (!(img instanceof MultiResolutionToolkitImage)) {
807 return 0xFFFF;
808 }
809
810 List<ResolutionVariantItem<Image>> rvItems
811 = ((MultiResolutionToolkitImage) img).getResolutionVariantItems();
812
813 return rvItems.stream().map(rvItem -> {
814 double sx = rvItem.getScaleX();
815 double sy = rvItem.getScaleY();
816 return checkImage(
817 rvItem.getValue(),
818 getRVSize(w, sx),
819 getRVSize(h, sy),
820 MultiResolutionToolkitImage.getResolutionVariantObserver(
821 img, o, sx, sy, true));
822 }).reduce(0xFFFF , (a, b) -> a & b);
823
824
825 }
826
827 private boolean prepareResolutionVariants(Image img, int w, int h,
828 ImageObserver o) {
829
830 if (!(img instanceof MultiResolutionToolkitImage)) {
831 return true;
832 }
833
834 List<ResolutionVariantItem<Image>> rvItems
835 = ((MultiResolutionToolkitImage) img).getResolutionVariantItems();
836
837 return rvItems.stream().map(rvItem -> {
838 double sx = rvItem.getScaleX();
839 double sy = rvItem.getScaleY();
840 return prepareImage(
841 rvItem.getValue(),
842 getRVSize(w, sx),
843 getRVSize(h, sy),
844 MultiResolutionToolkitImage.getResolutionVariantObserver(
845 img, o, sx, sy, true));
846 }).reduce(true, (a, b) -> a && b);
847 }
848
849 private static int getRVSize(int size, double scale) {
850 return (size == -1)
851 ? -1
852 : (scale == 1 ? size : (int) Math.round(scale * size));
853 }
854
855 protected static boolean imageCached(String fileName) {
856 return fileImgCache.containsKey(fileName);
857 }
858
859 protected static boolean imageCached(URL url) {
860 String key = url.toString();
861 return urlImgCache.containsKey(key);
862 }
863
864 protected static boolean imageExists(String filename) {
865 if (filename != null) {
866 checkPermissions(filename);
867 return new File(filename).exists();
868 }
869 return false;
870 }
871
872 @SuppressWarnings("try")
873 protected static boolean imageExists(URL url) {
874 if (url != null) {
875 checkPermissions(url);
876 try (InputStream is = url.openStream()) {
877 return true;
878 }catch(IOException e){
879 return false;
880 }
881 }
882 return false;
883 }
884
885 private static void checkPermissions(String filename) {
886 SecurityManager security = System.getSecurityManager();
887 if (security != null) {
888 security.checkRead(filename);
889 }
890 }
891
892 private static void checkPermissions(URL url) {
893 SecurityManager sm = System.getSecurityManager();
894 if (sm != null) {
895 try {
896 java.security.Permission perm =
897 URLUtil.getConnectPermission(url);
898 if (perm != null) {
899 try {
900 sm.checkPermission(perm);
901 } catch (SecurityException se) {
902 // fallback to checkRead/checkConnect for pre 1.2
903 // security managers
904 if ((perm instanceof java.io.FilePermission) &&
905 perm.getActions().indexOf("read") != -1) {
906 sm.checkRead(perm.getName());
907 } else if ((perm instanceof
908 java.net.SocketPermission) &&
909 perm.getActions().indexOf("connect") != -1) {
910 sm.checkConnect(url.getHost(), url.getPort());
911 } else {
912 throw se;
913 }
914 }
915 }
916 } catch (java.io.IOException ioe) {
917 sm.checkConnect(url.getHost(), url.getPort());
918 }
919 }
920 }
921
922 /**
923 * Scans {@code imageList} for best-looking image of specified dimensions.
924 * Image can be scaled and/or padded with transparency.
925 */
926 public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
927 if (width == 0 || height == 0) {
928 return null;
929 }
930 Image bestImage = null;
931 int bestWidth = 0;
932 int bestHeight = 0;
933 double bestSimilarity = 3; //Impossibly high value
934 double bestScaleFactor = 0;
935 for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
936 //Iterate imageList looking for best matching image.
937 //'Similarity' measure is defined as good scale factor and small insets.
938 //best possible similarity is 0 (no scale, no insets).
939 //It's found while the experiments that good-looking result is achieved
940 //with scale factors x1, x3/4, x2/3, xN, x1/N.
941 Image im = i.next();
942 if (im == null) {
943 continue;
944 }
945 if (im instanceof ToolkitImage) {
946 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
947 ir.reconstruct(ImageObserver.ALLBITS);
948 }
949 int iw;
950 int ih;
951 try {
952 iw = im.getWidth(null);
953 ih = im.getHeight(null);
954 } catch (Exception e){
955 continue;
956 }
957 if (iw > 0 && ih > 0) {
958 //Calc scale factor
959 double scaleFactor = Math.min((double)width / (double)iw,
960 (double)height / (double)ih);
961 //Calculate scaled image dimensions
962 //adjusting scale factor to nearest "good" value
963 int adjw = 0;
964 int adjh = 0;
965 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
966 if (scaleFactor >= 2) {
967 //Need to enlarge image more than twice
968 //Round down scale factor to multiply by integer value
969 scaleFactor = Math.floor(scaleFactor);
970 adjw = iw * (int)scaleFactor;
971 adjh = ih * (int)scaleFactor;
972 scaleMeasure = 1.0 - 0.5 / scaleFactor;
973 } else if (scaleFactor >= 1) {
974 //Don't scale
975 scaleFactor = 1.0;
976 adjw = iw;
977 adjh = ih;
978 scaleMeasure = 0;
979 } else if (scaleFactor >= 0.75) {
980 //Multiply by 3/4
981 scaleFactor = 0.75;
982 adjw = iw * 3 / 4;
983 adjh = ih * 3 / 4;
984 scaleMeasure = 0.3;
985 } else if (scaleFactor >= 0.6666) {
986 //Multiply by 2/3
987 scaleFactor = 0.6666;
988 adjw = iw * 2 / 3;
989 adjh = ih * 2 / 3;
990 scaleMeasure = 0.33;
991 } else {
992 //Multiply size by 1/scaleDivider
993 //where scaleDivider is minimum possible integer
994 //larger than 1/scaleFactor
995 double scaleDivider = Math.ceil(1.0 / scaleFactor);
996 scaleFactor = 1.0 / scaleDivider;
997 adjw = (int)Math.round((double)iw / scaleDivider);
998 adjh = (int)Math.round((double)ih / scaleDivider);
999 scaleMeasure = 1.0 - 1.0 / scaleDivider;
1000 }
1001 double similarity = ((double)width - (double)adjw) / (double)width +
1002 ((double)height - (double)adjh) / (double)height + //Large padding is bad
1003 scaleMeasure; //Large rescale is bad
1004 if (similarity < bestSimilarity) {
1005 bestSimilarity = similarity;
1006 bestScaleFactor = scaleFactor;
1007 bestImage = im;
1008 bestWidth = adjw;
1009 bestHeight = adjh;
1010 }
1011 if (similarity == 0) break;
1012 }
1013 }
1014 if (bestImage == null) {
1015 //No images were found, possibly all are broken
1016 return null;
1017 }
1018 BufferedImage bimage =
1019 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
1020 Graphics2D g = bimage.createGraphics();
1021 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
1022 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
1023 try {
1024 int x = (width - bestWidth) / 2;
1025 int y = (height - bestHeight) / 2;
1026 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
1027 } finally {
1028 g.dispose();
1029 }
1030 return bimage;
1031 }
1032
1033 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
1034 BufferedImage bimage = getScaledIconImage(imageList, width, height);
1035 if (bimage == null) {
1036 return null;
1037 }
1038 Raster raster = bimage.getRaster();
1039 DataBuffer buffer = raster.getDataBuffer();
1040 return (DataBufferInt)buffer;
1041 }
1042
1043 @Override
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 * Tests whether specified key modifiers mask can be used to enter a printable
1088 * character. This is a default implementation of this method, which reflects
1089 * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1090 * characters from the extended character set (like euro sign or math symbols)
1091 */
1092 public boolean isPrintableCharacterModifiersMask(int mods) {
1093 return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1094 }
1095
1096 /**
1097 * Returns whether popup is allowed to be shown above the task bar.
1098 * This is a default implementation of this method, which checks
1099 * corresponding security permission.
1100 */
1101 public boolean canPopupOverlapTaskBar() {
1102 boolean result = true;
1103 try {
1104 SecurityManager sm = System.getSecurityManager();
1105 if (sm != null) {
1106 sm.checkPermission(AWTPermissions.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1107 }
1108 } catch (SecurityException se) {
1109 // There is no permission to show popups over the task bar
1110 result = false;
1111 }
1112 return result;
1113 }
1114
1115 /**
1116 * Returns a new input method window, with behavior as specified in
1117 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1118 * If the inputContext is not null, the window should return it from its
1119 * getInputContext() method. The window needs to implement
1120 * sun.awt.im.InputMethodWindow.
1121 * <p>
1122 * SunToolkit subclasses can override this method to return better input
1123 * method windows.
1124 */
1125 @Override
1126 public Window createInputMethodWindow(String title, InputContext context) {
1127 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1128 }
1129
1130 /**
1131 * Returns whether enableInputMethods should be set to true for peered
1132 * TextComponent instances on this platform. False by default.
1133 */
1134 @Override
1135 public boolean enableInputMethodsForTextComponent() {
1136 return false;
1137 }
1138
1139 private static Locale startupLocale = null;
1140
1141 /**
1142 * Returns the locale in which the runtime was started.
1143 */
1144 public static Locale getStartupLocale() {
1145 if (startupLocale == null) {
1146 String language, region, country, variant;
1147 language = AccessController.doPrivileged(
1148 new GetPropertyAction("user.language", "en"));
1149 // for compatibility, check for old user.region property
1150 region = AccessController.doPrivileged(
1151 new GetPropertyAction("user.region"));
1152 if (region != null) {
1153 // region can be of form country, country_variant, or _variant
1154 int i = region.indexOf('_');
1155 if (i >= 0) {
1156 country = region.substring(0, i);
1157 variant = region.substring(i + 1);
1158 } else {
1159 country = region;
1160 variant = "";
1161 }
1162 } else {
1163 country = AccessController.doPrivileged(
1164 new GetPropertyAction("user.country", ""));
1165 variant = AccessController.doPrivileged(
1166 new GetPropertyAction("user.variant", ""));
1167 }
1168 startupLocale = new Locale(language, country, variant);
1169 }
1170 return startupLocale;
1171 }
1172
1173 /**
1174 * Returns the default keyboard locale of the underlying operating system
1175 */
1176 @Override
1177 public Locale getDefaultKeyboardLocale() {
1178 return getStartupLocale();
1179 }
1180
1181 /**
1182 * Returns whether default toolkit needs the support of the xembed
1183 * from embedding host(if any).
1184 * @return {@code true}, if XEmbed is needed, {@code false} otherwise
1185 */
1186 public static boolean needsXEmbed() {
1187 String noxembed = AccessController.
1188 doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1189 if ("true".equals(noxembed)) {
1190 return false;
1191 }
1192
1193 Toolkit tk = Toolkit.getDefaultToolkit();
1194 if (tk instanceof SunToolkit) {
1195 // SunToolkit descendants should override this method to specify
1196 // concrete behavior
1197 return ((SunToolkit)tk).needsXEmbedImpl();
1198 } else {
1199 // Non-SunToolkit doubtly might support XEmbed
1200 return false;
1201 }
1202 }
1203
1204 /**
1205 * Returns whether this toolkit needs the support of the xembed
1206 * from embedding host(if any).
1207 * @return {@code true}, if XEmbed is needed, {@code false} otherwise
1208 */
1209 protected boolean needsXEmbedImpl() {
1210 return false;
1211 }
1212
1213 private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1214
1215 /**
1216 * Returns whether the XEmbed server feature is requested by
1217 * developer. If true, Toolkit should return an
1218 * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1219 */
1220 protected final boolean isXEmbedServerRequested() {
1221 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1222 }
1223
1224 /**
1225 * Returns whether the modal exclusion API is supported by the current toolkit.
1226 * When it isn't supported, calling {@code setModalExcluded} has no
1227 * effect, and {@code isModalExcluded} returns false for all windows.
1228 *
1229 * @return true if modal exclusion is supported by the toolkit, false otherwise
1230 *
1231 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1232 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1233 *
1234 * @since 1.5
1235 */
1236 public static boolean isModalExcludedSupported()
1237 {
1238 Toolkit tk = Toolkit.getDefaultToolkit();
1239 return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1240 }
1241 /*
1242 * Default implementation for isModalExcludedSupportedImpl(), returns false.
1243 *
1244 * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1245 * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1246 *
1247 * @since 1.5
1248 */
1249 protected boolean isModalExcludedSupportedImpl()
1250 {
1251 return false;
1252 }
1253
1254 /*
1255 * Sets this window to be excluded from being modally blocked. When the
1256 * toolkit supports modal exclusion and this method is called, input
1257 * events, focus transfer and z-order will continue to work for the
1258 * window, it's owned windows and child components, even in the
1259 * presence of a modal dialog.
1260 * For details on which {@code Window}s are normally blocked
1261 * by modal dialog, see {@link java.awt.Dialog}.
1262 * Invoking this method when the modal exclusion API is not supported by
1263 * the current toolkit has no effect.
1264 * @param window Window to be marked as not modally blocked
1265 * @see java.awt.Dialog
1266 * @see java.awt.Dialog#setModal(boolean)
1267 * @see sun.awt.SunToolkit#isModalExcludedSupported
1268 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1269 */
1270 public static void setModalExcluded(Window window)
1271 {
1272 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1273 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1274 }
1275 window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1276 }
1277
1278 /*
1279 * Returns whether the specified window is blocked by modal dialogs.
1280 * If the modal exclusion API isn't supported by the current toolkit,
1281 * it returns false for all windows.
1282 *
1283 * @param window Window to test for modal exclusion
1284 *
1285 * @return true if the window is modal excluded, false otherwise. If
1286 * the modal exclusion isn't supported by the current Toolkit, false
1287 * is returned
1288 *
1289 * @see sun.awt.SunToolkit#isModalExcludedSupported
1290 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1291 *
1292 * @since 1.5
1293 */
1294 public static boolean isModalExcluded(Window window)
1295 {
1296 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1297 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1298 }
1299 return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1300 }
1301
1302 /**
1303 * Overridden in XToolkit and WToolkit
1304 */
1305 @Override
1306 public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1307 return (modalityType == Dialog.ModalityType.MODELESS) ||
1308 (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1309 }
1310
1311 /**
1312 * Overridden in XToolkit and WToolkit
1313 */
1314 @Override
1315 public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1316 return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1317 }
1318
1319 ///////////////////////////////////////////////////////////////////////////
1320 //
1321 // The following is used by the Java Plug-in to coordinate dialog modality
1322 // between containing applications (browsers, ActiveX containers etc) and
1323 // the AWT.
1324 //
1325 ///////////////////////////////////////////////////////////////////////////
1326
1327 private ModalityListenerList modalityListeners = new ModalityListenerList();
1328
1329 public void addModalityListener(ModalityListener listener) {
1330 modalityListeners.add(listener);
1331 }
1332
1333 public void removeModalityListener(ModalityListener listener) {
1334 modalityListeners.remove(listener);
1335 }
1336
1337 public void notifyModalityPushed(Dialog dialog) {
1338 notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1339 }
1340
1341 public void notifyModalityPopped(Dialog dialog) {
1342 notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1343 }
1344
1345 final void notifyModalityChange(int id, Dialog source) {
1346 ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1347 ev.dispatch();
1348 }
1349
1350 static class ModalityListenerList implements ModalityListener {
1351
1352 Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1353
1354 void add(ModalityListener listener) {
1355 listeners.addElement(listener);
1356 }
1357
1358 void remove(ModalityListener listener) {
1359 listeners.removeElement(listener);
1360 }
1361
1362 @Override
1363 public void modalityPushed(ModalityEvent ev) {
1364 Iterator<ModalityListener> it = listeners.iterator();
1365 while (it.hasNext()) {
1366 it.next().modalityPushed(ev);
1367 }
1368 }
1369
1370 @Override
1371 public void modalityPopped(ModalityEvent ev) {
1372 Iterator<ModalityListener> it = listeners.iterator();
1373 while (it.hasNext()) {
1374 it.next().modalityPopped(ev);
1375 }
1376 }
1377 } // end of class ModalityListenerList
1378
1379 ///////////////////////////////////////////////////////////////////////////
1380 // End Plug-in code
1381 ///////////////////////////////////////////////////////////////////////////
1382
1383 public static boolean isLightweightOrUnknown(Component comp) {
1384 if (comp.isLightweight()
1385 || !(getDefaultToolkit() instanceof SunToolkit))
1386 {
1387 return true;
1388 }
1389 return !(comp instanceof Button
1390 || comp instanceof Canvas
1391 || comp instanceof Checkbox
1392 || comp instanceof Choice
1393 || comp instanceof Label
1394 || comp instanceof java.awt.List
1395 || comp instanceof Panel
1396 || comp instanceof Scrollbar
1397 || comp instanceof ScrollPane
1398 || comp instanceof TextArea
1399 || comp instanceof TextField
1400 || comp instanceof Window);
1401 }
1402
1403 @SuppressWarnings("serial")
1404 public static class OperationTimedOut extends RuntimeException {
1405 public OperationTimedOut(String msg) {
1406 super(msg);
1407 }
1408 public OperationTimedOut() {
1409 }
1410 }
1411
1412 @SuppressWarnings("serial")
1413 public static class InfiniteLoop extends RuntimeException {
1414 }
1415
1416 @SuppressWarnings("serial")
1417 public static class IllegalThreadException extends RuntimeException {
1418 public IllegalThreadException(String msg) {
1419 super(msg);
1420 }
1421 public IllegalThreadException() {
1422 }
1423 }
1424
1425 public static final int DEFAULT_WAIT_TIME = 10000;
1426 private static final int MAX_ITERS = 20;
1427 private static final int MIN_ITERS = 0;
1428 private static final int MINIMAL_EDELAY = 0;
1429
1430 /**
1431 * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1432 */
1433 public void realSync() throws OperationTimedOut, InfiniteLoop {
1434 realSync(DEFAULT_WAIT_TIME);
1435 }
1436
1437 /**
1438 * Forces toolkit to synchronize with the native windowing
1439 * sub-system, flushing all pending work and waiting for all the
1440 * events to be processed. This method guarantees that after
1441 * return no additional Java events will be generated, unless
1442 * cause by user. Obviously, the method cannot be used on the
1443 * event dispatch thread (EDT). In case it nevertheless gets
1444 * invoked on this thread, the method throws the
1445 * IllegalThreadException runtime exception.
1446 *
1447 * <p> This method allows to write tests without explicit timeouts
1448 * or wait for some event. Example:
1449 * <pre>{@code
1450 * Frame f = ...;
1451 * f.setVisible(true);
1452 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1453 * }</pre>
1454 *
1455 * <p> After realSync, {@code f} will be completely visible
1456 * on the screen, its getLocationOnScreen will be returning the
1457 * right result and it will be the focus owner.
1458 *
1459 * <p> Another example:
1460 * <pre>{@code
1461 * b.requestFocus();
1462 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1463 * }</pre>
1464 *
1465 * <p> After realSync, {@code b} will be focus owner.
1466 *
1467 * <p> Notice that realSync isn't guaranteed to work if recurring
1468 * actions occur, such as if during processing of some event
1469 * another request which may generate some events occurs. By
1470 * default, sync tries to perform as much as {@value #MAX_ITERS}
1471 * cycles of event processing, allowing for roughly {@value
1472 * #MAX_ITERS} additional requests.
1473 *
1474 * <p> For example, requestFocus() generates native request, which
1475 * generates one or two Java focus events, which then generate a
1476 * serie of paint events, a serie of Java focus events, which then
1477 * generate a serie of paint events which then are processed -
1478 * three cycles, minimum.
1479 *
1480 * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1481 */
1482 public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1483 {
1484 if (EventQueue.isDispatchThread()) {
1485 throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1486 }
1487 int bigLoop = 0;
1488 do {
1489 // Let's do sync first
1490 sync();
1491
1492 // During the wait process, when we were processing incoming
1493 // events, we could have made some new request, which can
1494 // generate new events. Example: MapNotify/XSetInputFocus.
1495 // Therefore, we dispatch them as long as there is something
1496 // to dispatch.
1497 int iters = 0;
1498 while (iters < MIN_ITERS) {
1499 syncNativeQueue(timeout);
1500 iters++;
1501 }
1502 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1503 iters++;
1504 }
1505 if (iters >= MAX_ITERS) {
1506 throw new InfiniteLoop();
1507 }
1508
1509 // native requests were dispatched by X/Window Manager or Windows
1510 // Moreover, we processed them all on Toolkit thread
1511 // Now wait while EDT processes them.
1512 //
1513 // During processing of some events (focus, for example),
1514 // some other events could have been generated. So, after
1515 // waitForIdle, we may end up with full EventQueue
1516 iters = 0;
1517 while (iters < MIN_ITERS) {
1518 waitForIdle(timeout);
1519 iters++;
1520 }
1521 while (waitForIdle(timeout) && iters < MAX_ITERS) {
1522 iters++;
1523 }
1524 if (iters >= MAX_ITERS) {
1525 throw new InfiniteLoop();
1526 }
1527
1528 bigLoop++;
1529 // Again, for Java events, it was simple to check for new Java
1530 // events by checking event queue, but what if Java events
1531 // resulted in native requests? Therefor, check native events again.
1532 } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1533 }
1534
1535 /**
1536 * Platform toolkits need to implement this method to perform the
1537 * sync of the native queue. The method should wait until native
1538 * requests are processed, all native events are processed and
1539 * corresponding Java events are generated. Should return
1540 * {@code true} if some events were processed,
1541 * {@code false} otherwise.
1542 */
1543 protected abstract boolean syncNativeQueue(final long timeout);
1544
1545 private boolean eventDispatched = false;
1546 private boolean queueEmpty = false;
1547 private final Object waitLock = "Wait Lock";
1548
1549 private boolean isEQEmpty() {
1550 EventQueue queue = getSystemEventQueueImpl();
1551 return AWTAccessor.getEventQueueAccessor().noEvents(queue);
1552 }
1553
1554 /**
1555 * Waits for the Java event queue to empty. Ensures that all
1556 * events are processed (including paint events), and that if
1557 * recursive events were generated, they are also processed.
1558 * Should return {@code true} if more processing is
1559 * necessary, {@code false} otherwise.
1560 */
1561 @SuppressWarnings("serial")
1562 protected final boolean waitForIdle(final long timeout) {
1563 flushPendingEvents();
1564 boolean queueWasEmpty = isEQEmpty();
1565 queueEmpty = false;
1566 eventDispatched = false;
1567 synchronized(waitLock) {
1568 postEvent(AppContext.getAppContext(),
1569 new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1570 @Override
1571 public void dispatch() {
1572 // Here we block EDT. It could have some
1573 // events, it should have dispatched them by
1574 // now. So native requests could have been
1575 // generated. First, dispatch them. Then,
1576 // flush Java events again.
1577 int iters = 0;
1578 while (iters < MIN_ITERS) {
1579 syncNativeQueue(timeout);
1580 iters++;
1581 }
1582 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1583 iters++;
1584 }
1585 flushPendingEvents();
1586
1587 synchronized(waitLock) {
1588 queueEmpty = isEQEmpty();
1589 eventDispatched = true;
1590 waitLock.notifyAll();
1591 }
1592 }
1593 });
1594 try {
1595 while (!eventDispatched) {
1596 waitLock.wait();
1597 }
1598 } catch (InterruptedException ie) {
1599 return false;
1600 }
1601 }
1602
1603 try {
1604 Thread.sleep(MINIMAL_EDELAY);
1605 } catch (InterruptedException ie) {
1606 throw new RuntimeException("Interrupted");
1607 }
1608
1609 flushPendingEvents();
1610
1611 // Lock to force write-cache flush for queueEmpty.
1612 synchronized (waitLock) {
1613 return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1614 }
1615 }
1616
1617 /**
1618 * Grabs the mouse input for the given window. The window must be
1619 * visible. The window or its children do not receive any
1620 * additional mouse events besides those targeted to them. All
1621 * other events will be dispatched as before - to the respective
1622 * targets. This Window will receive UngrabEvent when automatic
1623 * ungrab is about to happen. The event can be listened to by
1624 * installing AWTEventListener with WINDOW_EVENT_MASK. See
1625 * UngrabEvent class for the list of conditions when ungrab is
1626 * about to happen.
1627 * @see UngrabEvent
1628 */
1629 public abstract void grab(Window w);
1630
1631 /**
1632 * Forces ungrab. No event will be sent.
1633 */
1634 public abstract void ungrab(Window w);
1635
1636
1637 /**
1638 * Locates the splash screen library in a platform dependent way and closes
1639 * the splash screen. Should be invoked on first top-level frame display.
1640 * @see java.awt.SplashScreen
1641 * @since 1.6
1642 */
1643 public static native void closeSplashScreen();
1644
1645 /* The following methods and variables are to support retrieving
1646 * desktop text anti-aliasing settings
1647 */
1648
1649 /* Need an instance method because setDesktopProperty(..) is protected. */
1650 private void fireDesktopFontPropertyChanges() {
1651 setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1652 SunToolkit.getDesktopFontHints());
1653 }
1654
1655 private static boolean checkedSystemAAFontSettings;
1656 private static boolean useSystemAAFontSettings;
1657 private static boolean lastExtraCondition = true;
1658 private static RenderingHints desktopFontHints;
1659
1660 /* Since Swing is the reason for this "extra condition" logic its
1661 * worth documenting it in some detail.
1662 * First, a goal is for Swing and applications to both retrieve and
1663 * use the same desktop property value so that there is complete
1664 * consistency between the settings used by JDK's Swing implementation
1665 * and 3rd party custom Swing components, custom L&Fs and any general
1666 * text rendering that wants to be consistent with these.
1667 * But by default on Solaris & Linux Swing will not use AA text over
1668 * remote X11 display (unless Xrender can be used which is TBD and may not
1669 * always be available anyway) as that is a noticeable performance hit.
1670 * So there needs to be a way to express that extra condition so that
1671 * it is seen by all clients of the desktop property API.
1672 * If this were the only condition it could be handled here as it would
1673 * be the same for any L&F and could reasonably be considered to be
1674 * a static behaviour of those systems.
1675 * But GTK currently has an additional test based on locale which is
1676 * not applied by Metal. So mixing GTK in a few locales with Metal
1677 * would mean the last one wins.
1678 * This could be stored per-app context which would work
1679 * for different applets, but wouldn't help for a single application
1680 * using GTK and some other L&F concurrently.
1681 * But it is expected this will be addressed within GTK and the font
1682 * system so is a temporary and somewhat unlikely harmless corner case.
1683 */
1684 public static void setAAFontSettingsCondition(boolean extraCondition) {
1685 if (extraCondition != lastExtraCondition) {
1686 lastExtraCondition = extraCondition;
1687 if (checkedSystemAAFontSettings) {
1688 /* Someone already asked for this info, under a different
1689 * condition.
1690 * We'll force re-evaluation instead of replicating the
1691 * logic, then notify any listeners of any change.
1692 */
1693 checkedSystemAAFontSettings = false;
1694 Toolkit tk = Toolkit.getDefaultToolkit();
1695 if (tk instanceof SunToolkit) {
1696 ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1697 }
1698 }
1699 }
1700 }
1701
1702 /* "false", "off", ""default" aren't explicitly tested, they
1703 * just fall through to produce a null return which all are equated to
1704 * "false".
1705 */
1706 private static RenderingHints getDesktopAAHintsByName(String hintname) {
1707 Object aaHint = null;
1708 hintname = hintname.toLowerCase(Locale.ENGLISH);
1709 if (hintname.equals("on")) {
1710 aaHint = VALUE_TEXT_ANTIALIAS_ON;
1711 } else if (hintname.equals("gasp")) {
1712 aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1713 } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1714 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1715 } else if (hintname.equals("lcd_hbgr")) {
1716 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1717 } else if (hintname.equals("lcd_vrgb")) {
1718 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1719 } else if (hintname.equals("lcd_vbgr")) {
1720 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1721 }
1722 if (aaHint != null) {
1723 RenderingHints map = new RenderingHints(null);
1724 map.put(KEY_TEXT_ANTIALIASING, aaHint);
1725 return map;
1726 } else {
1727 return null;
1728 }
1729 }
1730
1731 /* This method determines whether to use the system font settings,
1732 * or ignore them if a L&F has specified they should be ignored, or
1733 * to override both of these with a system property specified value.
1734 * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1735 * system property isn't applied as desktop properties are considered
1736 * to be inapplicable in that case. In that headless case although
1737 * this method will return "true" the toolkit will return a null map.
1738 */
1739 private static boolean useSystemAAFontSettings() {
1740 if (!checkedSystemAAFontSettings) {
1741 useSystemAAFontSettings = true; /* initially set this true */
1742 String systemAAFonts = null;
1743 Toolkit tk = Toolkit.getDefaultToolkit();
1744 if (tk instanceof SunToolkit) {
1745 systemAAFonts =
1746 AccessController.doPrivileged(
1747 new GetPropertyAction("awt.useSystemAAFontSettings"));
1748 }
1749 if (systemAAFonts != null) {
1750 useSystemAAFontSettings =
1751 Boolean.valueOf(systemAAFonts).booleanValue();
1752 /* If it is anything other than "true", then it may be
1753 * a hint name , or it may be "off, "default", etc.
1754 */
1755 if (!useSystemAAFontSettings) {
1756 desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1757 }
1758 }
1759 /* If its still true, apply the extra condition */
1760 if (useSystemAAFontSettings) {
1761 useSystemAAFontSettings = lastExtraCondition;
1762 }
1763 checkedSystemAAFontSettings = true;
1764 }
1765 return useSystemAAFontSettings;
1766 }
1767
1768 /* A variable defined for the convenience of JDK code */
1769 public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1770
1771 /* Overridden by subclasses to return platform/desktop specific values */
1772 protected RenderingHints getDesktopAAHints() {
1773 return null;
1774 }
1775
1776 /* Subclass desktop property loading methods call this which
1777 * in turn calls the appropriate subclass implementation of
1778 * getDesktopAAHints() when system settings are being used.
1779 * Its public rather than protected because subclasses may delegate
1780 * to a helper class.
1781 */
1782 public static RenderingHints getDesktopFontHints() {
1783 if (useSystemAAFontSettings()) {
1784 Toolkit tk = Toolkit.getDefaultToolkit();
1785 if (tk instanceof SunToolkit) {
1786 Object map = ((SunToolkit)tk).getDesktopAAHints();
1787 return (RenderingHints)map;
1788 } else { /* Headless Toolkit */
1789 return null;
1790 }
1791 } else if (desktopFontHints != null) {
1792 /* cloning not necessary as the return value is cloned later, but
1793 * its harmless.
1794 */
1795 return (RenderingHints)(desktopFontHints.clone());
1796 } else {
1797 return null;
1798 }
1799 }
1800
1801
1802 public abstract boolean isDesktopSupported();
1803
1804 /*
1805 * consumeNextKeyTyped() method is not currently used,
1806 * however Swing could use it in the future.
1807 */
1808 public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1809 try {
1810 AWTAccessor.getDefaultKeyboardFocusManagerAccessor().consumeNextKeyTyped(
1811 (DefaultKeyboardFocusManager)KeyboardFocusManager.
1812 getCurrentKeyboardFocusManager(),
1813 keyEvent);
1814 } catch (ClassCastException cce) {
1815 cce.printStackTrace();
1816 }
1817 }
1818
1819 protected static void dumpPeers(final PlatformLogger aLog) {
1820 AWTAutoShutdown.getInstance().dumpPeers(aLog);
1821 }
1822
1823 /**
1824 * Returns the {@code Window} ancestor of the component {@code comp}.
1825 * @return Window ancestor of the component or component by itself if it is Window;
1826 * null, if component is not a part of window hierarchy
1827 */
1828 public static Window getContainingWindow(Component comp) {
1829 while (comp != null && !(comp instanceof Window)) {
1830 comp = comp.getParent();
1831 }
1832 return (Window)comp;
1833 }
1834
1835 private static Boolean sunAwtDisableMixing = null;
1836
1837 /**
1838 * Returns the value of "sun.awt.disableMixing" property. Default
1839 * value is {@code false}.
1840 */
1841 public static synchronized boolean getSunAwtDisableMixing() {
1842 if (sunAwtDisableMixing == null) {
1843 sunAwtDisableMixing = AccessController.doPrivileged(
1844 new GetBooleanAction("sun.awt.disableMixing"));
1845 }
1846 return sunAwtDisableMixing.booleanValue();
1847 }
1848
1849 /**
1850 * Returns true if the native GTK libraries are available. The
1851 * default implementation returns false, but UNIXToolkit overrides this
1852 * method to provide a more specific answer.
1853 */
1854 public boolean isNativeGTKAvailable() {
1855 return false;
1856 }
1857
1858 private static final Object DEACTIVATION_TIMES_MAP_KEY = new Object();
1859
1860 public synchronized void setWindowDeactivationTime(Window w, long time) {
1861 AppContext ctx = getAppContext(w);
1862 if (ctx == null) {
1863 return;
1864 }
1865 @SuppressWarnings("unchecked")
1866 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1867 if (map == null) {
1868 map = new WeakHashMap<Window, Long>();
1869 ctx.put(DEACTIVATION_TIMES_MAP_KEY, map);
1870 }
1871 map.put(w, time);
1872 }
1873
1874 public synchronized long getWindowDeactivationTime(Window w) {
1875 AppContext ctx = getAppContext(w);
1876 if (ctx == null) {
1877 return -1;
1878 }
1879 @SuppressWarnings("unchecked")
1880 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1881 if (map == null) {
1882 return -1;
1883 }
1884 Long time = map.get(w);
1885 return time == null ? -1 : time;
1886 }
1887
1888 // Cosntant alpha
1889 public boolean isWindowOpacitySupported() {
1890 return false;
1891 }
1892
1893 // Shaping
1894 public boolean isWindowShapingSupported() {
1895 return false;
1896 }
1897
1898 // Per-pixel alpha
1899 public boolean isWindowTranslucencySupported() {
1900 return false;
1901 }
1902
1903 public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1904 return false;
1905 }
1906
1907 /**
1908 * Returns true if swing backbuffer should be translucent.
1909 */
1910 public boolean isSwingBackbufferTranslucencySupported() {
1911 return false;
1912 }
1913
1914 /**
1915 * Returns whether or not a containing top level window for the passed
1916 * component is
1917 * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1918 *
1919 * @param c a Component which toplevel's to check
1920 * @return {@code true} if the passed component is not null and has a
1921 * containing toplevel window which is opaque (so per-pixel translucency
1922 * is not enabled), {@code false} otherwise
1923 * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1924 */
1925 public static boolean isContainingTopLevelOpaque(Component c) {
1926 Window w = getContainingWindow(c);
1927 return w != null && w.isOpaque();
1928 }
1929
1930 /**
1931 * Returns whether or not a containing top level window for the passed
1932 * component is
1933 * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1934 *
1935 * @param c a Component which toplevel's to check
1936 * @return {@code true} if the passed component is not null and has a
1937 * containing toplevel window which has opacity less than
1938 * 1.0f (which means that it is translucent), {@code false} otherwise
1939 * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1940 */
1941 public static boolean isContainingTopLevelTranslucent(Component c) {
1942 Window w = getContainingWindow(c);
1943 return w != null && w.getOpacity() < 1.0f;
1944 }
1945
1946 /**
1947 * Returns whether the native system requires using the peer.updateWindow()
1948 * method to update the contents of a non-opaque window, or if usual
1949 * painting procedures are sufficient. The default return value covers
1950 * the X11 systems. On MS Windows this method is overriden in WToolkit
1951 * to return true.
1952 */
1953 public boolean needUpdateWindow() {
1954 return false;
1955 }
1956
1957 /**
1958 * Descendants of the SunToolkit should override and put their own logic here.
1959 */
1960 public int getNumberOfButtons(){
1961 return 3;
1962 }
1963
1964 /**
1965 * Checks that the given object implements/extends the given
1966 * interface/class.
1967 *
1968 * Note that using the instanceof operator causes a class to be loaded.
1969 * Using this method doesn't load a class and it can be used instead of
1970 * the instanceof operator for performance reasons.
1971 *
1972 * @param obj Object to be checked
1973 * @param type The name of the interface/class. Must be
1974 * fully-qualified interface/class name.
1975 * @return true, if this object implements/extends the given
1976 * interface/class, false, otherwise, or if obj or type is null
1977 */
1978 public static boolean isInstanceOf(Object obj, String type) {
1979 if (obj == null) return false;
1980 if (type == null) return false;
1981
1982 return isInstanceOf(obj.getClass(), type);
1983 }
1984
1985 private static boolean isInstanceOf(Class<?> cls, String type) {
1986 if (cls == null) return false;
1987
1988 if (cls.getName().equals(type)) {
1989 return true;
1990 }
1991
1992 for (Class<?> c : cls.getInterfaces()) {
1993 if (c.getName().equals(type)) {
1994 return true;
1995 }
1996 }
1997 return isInstanceOf(cls.getSuperclass(), type);
1998 }
1999
2000 protected static LightweightFrame getLightweightFrame(Component c) {
2001 for (; c != null; c = c.getParent()) {
2002 if (c instanceof LightweightFrame) {
2003 return (LightweightFrame)c;
2004 }
2005 if (c instanceof Window) {
2006 // Don't traverse owner windows
2007 return null;
2008 }
2009 }
2010 return null;
2011 }
2012
2013 ///////////////////////////////////////////////////////////////////////////
2014 //
2015 // The following methods help set and identify whether a particular
2016 // AWTEvent object was produced by the system or by user code. As of this
2017 // writing the only consumer is the Java Plug-In, although this information
2018 // could be useful to more clients and probably should be formalized in
2019 // the public API.
2020 //
2021 ///////////////////////////////////////////////////////////////////////////
2022
2023 public static void setSystemGenerated(AWTEvent e) {
2024 AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2025 }
2026
2027 public static boolean isSystemGenerated(AWTEvent e) {
2028 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2029 }
2030
2031 } // class SunToolkit
2032
2033
2034 /*
2035 * PostEventQueue is a Thread that runs in the same AppContext as the
2036 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2037 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2038 * events to this queue, which then calls EventQueue.postEvent().
2039 *
2040 * We do this because EventQueue.postEvent() may be overridden by client
2041 * code, and we mustn't ever call client code from the toolkit thread.
2042 */
2043 class PostEventQueue {
2044 private EventQueueItem queueHead = null;
2045 private EventQueueItem queueTail = null;
2046 private final EventQueue eventQueue;
2047
2048 private Thread flushThread = null;
2049
2050 PostEventQueue(EventQueue eq) {
2051 eventQueue = eq;
2052 }
2053
2054 /*
2055 * Continually post pending AWTEvents to the Java EventQueue. The method
2056 * is synchronized to ensure the flush is completed before a new event
2057 * can be posted to this queue.
2058 *
2059 * 7177040: The method couldn't be wholly synchronized because of calls
2060 * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2061 * potentially lead to deadlock
2062 */
2063 public void flush() {
2064
2065 Thread newThread = Thread.currentThread();
2066
2067 try {
2068 EventQueueItem tempQueue;
2069 synchronized (this) {
2070 // Avoid method recursion
2071 if (newThread == flushThread) {
2072 return;
2073 }
2074 // Wait for other threads' flushing
2075 while (flushThread != null) {
2076 wait();
2077 }
2078 // Skip everything if queue is empty
2079 if (queueHead == null) {
2080 return;
2081 }
2082 // Remember flushing thread
2083 flushThread = newThread;
2084
2085 tempQueue = queueHead;
2086 queueHead = queueTail = null;
2087 }
2088 try {
2089 while (tempQueue != null) {
2090 eventQueue.postEvent(tempQueue.event);
2091 tempQueue = tempQueue.next;
2092 }
2093 }
2094 finally {
2095 // Only the flushing thread can get here
2096 synchronized (this) {
2097 // Forget flushing thread, inform other pending threads
2098 flushThread = null;
2099 notifyAll();
2100 }
2101 }
2102 }
2103 catch (InterruptedException e) {
2104 // Couldn't allow exception go up, so at least recover the flag
2105 newThread.interrupt();
2106 }
2107 }
2108
2109 /*
2110 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2111 */
2112 void postEvent(AWTEvent event) {
2113 EventQueueItem item = new EventQueueItem(event);
2114
2115 synchronized (this) {
2116 if (queueHead == null) {
2117 queueHead = queueTail = item;
2118 } else {
2119 queueTail.next = item;
2120 queueTail = item;
2121 }
2122 }
2123 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2124 }
2125 } // class PostEventQueue