1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.awt;
27
28 import java.awt.*;
29 import static java.awt.RenderingHints.*;
30 import java.awt.dnd.*;
31 import java.awt.dnd.peer.DragSourceContextPeer;
32 import java.awt.peer.*;
33 import java.awt.event.WindowEvent;
34 import java.awt.event.KeyEvent;
35 import java.awt.image.*;
36 import java.awt.TrayIcon;
37 import java.awt.SystemTray;
38 import java.awt.event.InputEvent;
39 import java.io.File;
40 import java.io.IOException;
41 import java.io.InputStream;
42 import java.net.URL;
43 import java.security.PrivilegedAction;
44 import java.util.*;
45 import java.util.concurrent.TimeUnit;
46 import java.util.concurrent.locks.Condition;
47 import java.util.concurrent.locks.Lock;
48 import java.util.concurrent.locks.ReentrantLock;
49
50 import sun.awt.datatransfer.DataTransferer;
51 import sun.util.logging.PlatformLogger;
52 import sun.misc.SoftCache;
53 import sun.font.FontDesignMetrics;
54 import sun.awt.im.InputContext;
55 import sun.awt.image.*;
56 import sun.security.action.GetPropertyAction;
57 import sun.security.action.GetBooleanAction;
58 import java.lang.reflect.InvocationTargetException;
59 import java.security.AccessController;
60
61 public abstract class SunToolkit extends Toolkit
62 implements ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
63
64 // 8014718: logging has been removed from SunToolkit
65
66 /* Load debug settings for native code */
67 static {
68 if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
69 DebugSettings.init();
70 }
71 };
72
73 /**
74 * Special mask for the UngrabEvent events, in addition to the
75 * public masks defined in AWTEvent. Should be used as the mask
76 * value for Toolkit.addAWTEventListener.
77 */
78 public static final int GRAB_EVENT_MASK = 0x80000000;
79
80 /* The key to put()/get() the PostEventQueue into/from the AppContext.
81 */
82 private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
83
84 /**
85 * Number of buttons.
86 * By default it's taken from the system. If system value does not
87 * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
88 */
89 protected static int numberOfButtons = 0;
90
91
92 /* XFree standard mention 24 buttons as maximum:
93 * http://www.xfree86.org/current/mouse.4.html
94 * We workaround systems supporting more than 24 buttons.
95 * Otherwise, we have to use long type values as masks
96 * which leads to API change.
97 * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
98 * the 4-bytes limit for the int type. (CR 6799099)
99 * One more bit is reserved for FIRST_HIGH_BIT.
100 */
101 public final static int MAX_BUTTONS_SUPPORTED = 20;
102
103 /**
104 * Creates and initializes EventQueue instance for the specified
105 * AppContext.
106 * Note that event queue must be created from createNewAppContext()
107 * only in order to ensure that EventQueue constructor obtains
108 * the correct AppContext.
109 * @param appContext AppContext to associate with the event queue
110 */
111 private static void initEQ(AppContext appContext) {
112 EventQueue eventQueue;
113
114 String eqName = System.getProperty("AWT.EventQueueClass",
115 "java.awt.EventQueue");
116
117 try {
118 eventQueue = (EventQueue)Class.forName(eqName).newInstance();
119 } catch (Exception e) {
120 e.printStackTrace();
121 System.err.println("Failed loading " + eqName + ": " + e);
122 eventQueue = new EventQueue();
123 }
124 appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
125
126 PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
127 appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
128 }
129
130 public SunToolkit() {
131 }
132
133 public boolean useBufferPerWindow() {
134 return false;
135 }
136
137 public abstract WindowPeer createWindow(Window target)
138 throws HeadlessException;
139
140 public abstract FramePeer createFrame(Frame target)
141 throws HeadlessException;
142
143 public abstract FramePeer createLightweightFrame(LightweightFrame target)
144 throws HeadlessException;
145
146 public abstract DialogPeer createDialog(Dialog target)
147 throws HeadlessException;
148
149 public abstract ButtonPeer createButton(Button target)
150 throws HeadlessException;
151
152 public abstract TextFieldPeer createTextField(TextField target)
153 throws HeadlessException;
154
155 public abstract ChoicePeer createChoice(Choice target)
156 throws HeadlessException;
157
158 public abstract LabelPeer createLabel(Label target)
159 throws HeadlessException;
160
161 public abstract ListPeer createList(java.awt.List target)
162 throws HeadlessException;
163
164 public abstract CheckboxPeer createCheckbox(Checkbox target)
165 throws HeadlessException;
166
167 public abstract ScrollbarPeer createScrollbar(Scrollbar target)
168 throws HeadlessException;
169
170 public abstract ScrollPanePeer createScrollPane(ScrollPane target)
171 throws HeadlessException;
172
173 public abstract TextAreaPeer createTextArea(TextArea target)
174 throws HeadlessException;
175
176 public abstract FileDialogPeer createFileDialog(FileDialog target)
177 throws HeadlessException;
178
179 public abstract MenuBarPeer createMenuBar(MenuBar target)
180 throws HeadlessException;
181
182 public abstract MenuPeer createMenu(Menu target)
183 throws HeadlessException;
184
185 public abstract PopupMenuPeer createPopupMenu(PopupMenu target)
186 throws HeadlessException;
187
188 public abstract MenuItemPeer createMenuItem(MenuItem target)
189 throws HeadlessException;
190
191 public abstract CheckboxMenuItemPeer createCheckboxMenuItem(
192 CheckboxMenuItem target)
193 throws HeadlessException;
194
195 public abstract DragSourceContextPeer createDragSourceContextPeer(
196 DragGestureEvent dge)
197 throws InvalidDnDOperationException;
198
199 public abstract TrayIconPeer createTrayIcon(TrayIcon target)
200 throws HeadlessException, AWTException;
201
202 public abstract SystemTrayPeer createSystemTray(SystemTray target);
203
204 public abstract boolean isTraySupported();
205
206 public abstract DataTransferer getDataTransferer();
207
208 @SuppressWarnings("deprecation")
209 public abstract FontPeer getFontPeer(String name, int style);
210
211 public abstract RobotPeer createRobot(Robot target, GraphicsDevice screen)
212 throws AWTException;
213
214 public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
215 throws HeadlessException;
216
217 /**
218 * The AWT lock is typically only used on Unix platforms to synchronize
219 * access to Xlib, OpenGL, etc. However, these methods are implemented
220 * in SunToolkit so that they can be called from shared code (e.g.
221 * from the OGL pipeline) or from the X11 pipeline regardless of whether
222 * XToolkit or MToolkit is currently in use. There are native macros
223 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
224 * methods is changed, make sure it is compatible with the native macros.
225 *
226 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
227 * used in place of:
228 * synchronized (getAWTLock()) {
229 * ...
230 * }
231 *
232 * By factoring these methods out specially, we are able to change the
233 * implementation of these methods (e.g. use more advanced locking
234 * mechanisms) without impacting calling code.
235 *
236 * Sample usage:
237 * private void doStuffWithXlib() {
238 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
239 * SunToolkit.awtLock();
240 * try {
241 * ...
242 * XlibWrapper.XDoStuff();
243 * } finally {
244 * SunToolkit.awtUnlock();
245 * }
246 * }
247 */
248
249 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
250 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
251
252 public static final void awtLock() {
253 AWT_LOCK.lock();
254 }
255
256 public static final boolean awtTryLock() {
257 return AWT_LOCK.tryLock();
258 }
259
260 public static final void awtUnlock() {
261 AWT_LOCK.unlock();
262 }
263
264 public static final void awtLockWait()
265 throws InterruptedException
266 {
267 AWT_LOCK_COND.await();
268 }
269
270 public static final void awtLockWait(long timeout)
271 throws InterruptedException
272 {
273 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
274 }
275
276 public static final void awtLockNotify() {
277 AWT_LOCK_COND.signal();
278 }
279
280 public static final void awtLockNotifyAll() {
281 AWT_LOCK_COND.signalAll();
282 }
283
284 public static final boolean isAWTLockHeldByCurrentThread() {
285 return AWT_LOCK.isHeldByCurrentThread();
286 }
287
288 /*
289 * Create a new AppContext, along with its EventQueue, for a
290 * new ThreadGroup. Browser code, for example, would use this
291 * method to create an AppContext & EventQueue for an Applet.
292 */
293 public static AppContext createNewAppContext() {
294 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
295 return createNewAppContext(threadGroup);
296 }
297
298 static final AppContext createNewAppContext(ThreadGroup threadGroup) {
299 // Create appContext before initialization of EventQueue, so all
300 // the calls to AppContext.getAppContext() from EventQueue ctor
301 // return correct values
302 AppContext appContext = new AppContext(threadGroup);
303 initEQ(appContext);
304
305 return appContext;
306 }
307
308 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
309 AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
310 }
311
312 /*
313 * Fetch the peer associated with the given target (as specified
314 * in the peer creation method). This can be used to determine
315 * things like what the parent peer is. If the target is null
316 * or the target can't be found (either because the a peer was
317 * never created for it or the peer was disposed), a null will
318 * be returned.
319 */
320 protected static Object targetToPeer(Object target) {
321 if (target != null && !GraphicsEnvironment.isHeadless()) {
322 return AWTAutoShutdown.getInstance().getPeer(target);
323 }
324 return null;
325 }
326
327 protected static void targetCreatedPeer(Object target, Object peer) {
328 if (target != null && peer != null &&
329 !GraphicsEnvironment.isHeadless())
330 {
331 AWTAutoShutdown.getInstance().registerPeer(target, peer);
332 }
333 }
334
335 protected static void targetDisposedPeer(Object target, Object peer) {
336 if (target != null && peer != null &&
337 !GraphicsEnvironment.isHeadless())
338 {
339 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
340 }
341 }
342
343 // Maps from non-Component/MenuComponent to AppContext.
344 // WeakHashMap<Component,AppContext>
345 private static final Map<Object, AppContext> appContextMap =
346 Collections.synchronizedMap(new WeakHashMap<Object, AppContext>());
347
348 /**
349 * Sets the appContext field of target. If target is not a Component or
350 * MenuComponent, this returns false.
351 */
352 private static boolean setAppContext(Object target,
353 AppContext context) {
354 if (target instanceof Component) {
355 AWTAccessor.getComponentAccessor().
356 setAppContext((Component)target, context);
357 } else if (target instanceof MenuComponent) {
358 AWTAccessor.getMenuComponentAccessor().
359 setAppContext((MenuComponent)target, context);
360 } else {
361 return false;
362 }
363 return true;
364 }
365
366 /**
367 * Returns the appContext field for target. If target is not a
368 * Component or MenuComponent this returns null.
369 */
370 private static AppContext getAppContext(Object target) {
371 if (target instanceof Component) {
372 return AWTAccessor.getComponentAccessor().
373 getAppContext((Component)target);
374 } else if (target instanceof MenuComponent) {
375 return AWTAccessor.getMenuComponentAccessor().
376 getAppContext((MenuComponent)target);
377 } else {
378 return null;
379 }
380 }
381
382 /*
383 * Fetch the AppContext associated with the given target.
384 * This can be used to determine things like which EventQueue
385 * to use for posting events to a Component. If the target is
386 * null or the target can't be found, a null with be returned.
387 */
388 public static AppContext targetToAppContext(Object target) {
389 if (target == null) {
390 return null;
391 }
392 AppContext context = getAppContext(target);
393 if (context == null) {
394 // target is not a Component/MenuComponent, try the
395 // appContextMap.
396 context = appContextMap.get(target);
397 }
398 return context;
399 }
400
401 /**
402 * Sets the synchronous status of focus requests on lightweight
403 * components in the specified window to the specified value.
404 * If the boolean parameter is <code>true</code> then the focus
405 * requests on lightweight components will be performed
406 * synchronously, if it is <code>false</code>, then asynchronously.
407 * By default, all windows have their lightweight request status
408 * set to asynchronous.
409 * <p>
410 * The application can only set the status of lightweight focus
411 * requests to synchronous for any of its windows if it doesn't
412 * perform focus transfers between different heavyweight containers.
413 * In this case the observable focus behaviour is the same as with
414 * asynchronous status.
415 * <p>
416 * If the application performs focus transfer between different
417 * heavyweight containers and sets the lightweight focus request
418 * status to synchronous for any of its windows, then further focus
419 * behaviour is unspecified.
420 * <p>
421 * @param w window for which the lightweight focus request status
422 * should be set
423 * @param status the value of lightweight focus request status
424 */
425
426 public static void setLWRequestStatus(Window changed,boolean status){
427 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
428 };
429
430 public static void checkAndSetPolicy(Container cont) {
431 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
432 getCurrentKeyboardFocusManager().
433 getDefaultFocusTraversalPolicy();
434
435 cont.setFocusTraversalPolicy(defaultPolicy);
436 }
437
438 private static FocusTraversalPolicy createLayoutPolicy() {
439 FocusTraversalPolicy policy = null;
440 try {
441 Class<?> layoutPolicyClass =
442 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
443 policy = (FocusTraversalPolicy)layoutPolicyClass.newInstance();
444 }
445 catch (ClassNotFoundException e) {
446 assert false;
447 }
448 catch (InstantiationException e) {
449 assert false;
450 }
451 catch (IllegalAccessException e) {
452 assert false;
453 }
454
455 return policy;
456 }
457
458 /*
459 * Insert a mapping from target to AppContext, for later retrieval
460 * via targetToAppContext() above.
461 */
462 public static void insertTargetMapping(Object target, AppContext appContext) {
463 if (!setAppContext(target, appContext)) {
464 // Target is not a Component/MenuComponent, use the private Map
465 // instead.
466 appContextMap.put(target, appContext);
467 }
468 }
469
470 /*
471 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
472 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
473 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
474 * not be called under another lock since it locks the EventQueue.
475 * See bugids 4632918, 4526597.
476 */
477 public static void postEvent(AppContext appContext, AWTEvent event) {
478 if (event == null) {
479 throw new NullPointerException();
480 }
481
482 AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
483 if (sea != null && sea.isSequencedEvent(event)) {
484 AWTEvent nested = sea.getNested(event);
485 if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
486 nested instanceof TimedWindowEvent)
487 {
488 TimedWindowEvent twe = (TimedWindowEvent)nested;
489 ((SunToolkit)Toolkit.getDefaultToolkit()).
490 setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
491 }
492 }
493
494 // All events posted via this method are system-generated.
495 // Placing the following call here reduces considerably the
496 // number of places throughout the toolkit that would
497 // otherwise have to be modified to precisely identify
498 // system-generated events.
499 setSystemGenerated(event);
500 AppContext eventContext = targetToAppContext(event.getSource());
501 if (eventContext != null && !eventContext.equals(appContext)) {
502 throw new RuntimeException("Event posted on wrong app context : " + event);
503 }
504 PostEventQueue postEventQueue =
505 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
506 if (postEventQueue != null) {
507 postEventQueue.postEvent(event);
508 }
509 }
510
511 /*
512 * Post AWTEvent of high priority.
513 */
514 public static void postPriorityEvent(final AWTEvent e) {
515 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
516 public void run() {
517 AWTAccessor.getAWTEventAccessor().setPosted(e);
518 ((Component)e.getSource()).dispatchEvent(e);
519 }
520 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
521 postEvent(targetToAppContext(e.getSource()), pe);
522 }
523
524 /*
525 * Flush any pending events which haven't been posted to the AWT
526 * EventQueue yet.
527 */
528 public static void flushPendingEvents() {
529 AppContext appContext = AppContext.getAppContext();
530 flushPendingEvents(appContext);
531 }
532
533 /*
534 * Flush the PostEventQueue for the right AppContext.
535 * The default flushPendingEvents only flushes the thread-local context,
536 * which is not always correct, c.f. 3746956
537 */
538 public static void flushPendingEvents(AppContext appContext) {
539 PostEventQueue postEventQueue =
540 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
541 if (postEventQueue != null) {
542 postEventQueue.flush();
543 }
544 }
545
546 /*
547 * Execute a chunk of code on the Java event handler thread for the
548 * given target. Does not wait for the execution to occur before
549 * returning to the caller.
550 */
551 public static void executeOnEventHandlerThread(Object target,
552 Runnable runnable) {
553 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
554 }
555
556 /*
557 * Fixed 5064013: the InvocationEvent time should be equals
558 * the time of the ActionEvent
559 */
560 @SuppressWarnings("serial")
561 public static void executeOnEventHandlerThread(Object target,
562 Runnable runnable,
563 final long when) {
564 executeOnEventHandlerThread(
565 new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT) {
566 public long getWhen() {
567 return when;
568 }
569 });
570 }
571
572 /*
573 * Execute a chunk of code on the Java event handler thread for the
574 * given target. Does not wait for the execution to occur before
575 * returning to the caller.
576 */
577 public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
578 postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
579 }
580
581 /*
582 * Execute a chunk of code on the Java event handler thread. The
583 * method takes into account provided AppContext and sets
584 * <code>SunToolkit.getDefaultToolkit()</code> as a target of the
585 * event. See 6451487 for detailes.
586 * Does not wait for the execution to occur before returning to
587 * the caller.
588 */
589 public static void invokeLaterOnAppContext(
590 AppContext appContext, Runnable dispatcher)
591 {
592 postEvent(appContext,
593 new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
594 PeerEvent.PRIORITY_EVENT));
595 }
596
597 /*
598 * Execute a chunk of code on the Java event handler thread for the
599 * given target. Waits for the execution to occur before returning
600 * to the caller.
601 */
602 public static void executeOnEDTAndWait(Object target, Runnable runnable)
603 throws InterruptedException, InvocationTargetException
604 {
605 if (EventQueue.isDispatchThread()) {
606 throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
607 }
608
609 class AWTInvocationLock {}
610 Object lock = new AWTInvocationLock();
611
612 PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
613
614 synchronized (lock) {
615 executeOnEventHandlerThread(event);
616 while(!event.isDispatched()) {
617 lock.wait();
618 }
619 }
620
621 Throwable eventThrowable = event.getThrowable();
622 if (eventThrowable != null) {
623 throw new InvocationTargetException(eventThrowable);
624 }
625 }
626
627 /*
628 * Returns true if the calling thread is the event dispatch thread
629 * contained within AppContext which associated with the given target.
630 * Use this call to ensure that a given task is being executed
631 * (or not being) on the event dispatch thread for the given target.
632 */
633 public static boolean isDispatchThreadForAppContext(Object target) {
634 AppContext appContext = targetToAppContext(target);
635 EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
636
637 AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
638 return accessor.isDispatchThreadImpl(eq);
639 }
640
641 public Dimension getScreenSize() {
642 return new Dimension(getScreenWidth(), getScreenHeight());
643 }
644 protected abstract int getScreenWidth();
645 protected abstract int getScreenHeight();
646
647 @SuppressWarnings("deprecation")
648 public FontMetrics getFontMetrics(Font font) {
649 return FontDesignMetrics.getMetrics(font);
650 }
651
652 @SuppressWarnings("deprecation")
653 public String[] getFontList() {
654 String[] hardwiredFontList = {
655 Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
656 Font.DIALOG_INPUT
657
658 // -- Obsolete font names from 1.0.2. It was decided that
659 // -- getFontList should not return these old names:
660 // "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
661 };
662 return hardwiredFontList;
663 }
664
665 public PanelPeer createPanel(Panel target) {
666 return (PanelPeer)createComponent(target);
667 }
668
669 public CanvasPeer createCanvas(Canvas target) {
670 return (CanvasPeer)createComponent(target);
671 }
672
673 /**
674 * Disables erasing of background on the canvas before painting if
675 * this is supported by the current toolkit. It is recommended to
676 * call this method early, before the Canvas becomes displayable,
677 * because some Toolkit implementations do not support changing
678 * this property once the Canvas becomes displayable.
679 */
680 public void disableBackgroundErase(Canvas canvas) {
681 disableBackgroundEraseImpl(canvas);
682 }
683
684 /**
685 * Disables the native erasing of the background on the given
686 * component before painting if this is supported by the current
687 * toolkit. This only has an effect for certain components such as
688 * Canvas, Panel and Window. It is recommended to call this method
689 * early, before the Component becomes displayable, because some
690 * Toolkit implementations do not support changing this property
691 * once the Component becomes displayable.
692 */
693 public void disableBackgroundErase(Component component) {
694 disableBackgroundEraseImpl(component);
695 }
696
697 private void disableBackgroundEraseImpl(Component component) {
698 AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
699 }
700
701 /**
702 * Returns the value of "sun.awt.noerasebackground" property. Default
703 * value is {@code false}.
704 */
705 public static boolean getSunAwtNoerasebackground() {
706 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
707 }
708
709 /**
710 * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
711 * value is {@code false}.
712 */
713 public static boolean getSunAwtErasebackgroundonresize() {
714 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
715 }
716
717
718 static final SoftCache imgCache = new SoftCache();
719
720 static Image getImageFromHash(Toolkit tk, URL url) {
721 checkPermissions(url);
722 synchronized (imgCache) {
723 Image img = (Image)imgCache.get(url);
724 if (img == null) {
725 try {
726 img = tk.createImage(new URLImageSource(url));
727 imgCache.put(url, img);
728 } catch (Exception e) {
729 }
730 }
731 return img;
732 }
733 }
734
735 static Image getImageFromHash(Toolkit tk,
736 String filename) {
737 checkPermissions(filename);
738 synchronized (imgCache) {
739 Image img = (Image)imgCache.get(filename);
740 if (img == null) {
741 try {
742 img = tk.createImage(new FileImageSource(filename));
743 imgCache.put(filename, img);
744 } catch (Exception e) {
745 }
746 }
747 return img;
748 }
749 }
750
751 public Image getImage(String filename) {
752 return getImageFromHash(this, filename);
753 }
754
755 public Image getImage(URL url) {
756 return getImageFromHash(this, url);
757 }
758
759 protected Image getImageWithResolutionVariant(String fileName,
760 String resolutionVariantName) {
761 synchronized (imgCache) {
762 Image image = getImageFromHash(this, fileName);
763 if (image instanceof MultiResolutionImage) {
764 return image;
765 }
766 Image resolutionVariant = getImageFromHash(this, resolutionVariantName);
767 image = createImageWithResolutionVariant(image, resolutionVariant);
768 imgCache.put(fileName, image);
769 return image;
770 }
771 }
772
773 protected Image getImageWithResolutionVariant(URL url,
774 URL resolutionVariantURL) {
775 synchronized (imgCache) {
776 Image image = getImageFromHash(this, url);
777 if (image instanceof MultiResolutionImage) {
778 return image;
779 }
780 Image resolutionVariant = getImageFromHash(this, resolutionVariantURL);
781 image = createImageWithResolutionVariant(image, resolutionVariant);
782 imgCache.put(url, image);
783 return image;
784 }
785 }
786
787
788 public Image createImage(String filename) {
789 checkPermissions(filename);
790 return createImage(new FileImageSource(filename));
791 }
792
793 public Image createImage(URL url) {
794 checkPermissions(url);
795 return createImage(new URLImageSource(url));
796 }
797
798 public Image createImage(byte[] data, int offset, int length) {
799 return createImage(new ByteArrayImageSource(data, offset, length));
800 }
801
802 public Image createImage(ImageProducer producer) {
803 return new ToolkitImage(producer);
804 }
805
806 public static Image createImageWithResolutionVariant(Image image,
807 Image resolutionVariant) {
808 return new MultiResolutionToolkitImage(image, resolutionVariant);
809 }
810
811 public int checkImage(Image img, int w, int h, ImageObserver o) {
812 if (!(img instanceof ToolkitImage)) {
813 return ImageObserver.ALLBITS;
814 }
815
816 ToolkitImage tkimg = (ToolkitImage)img;
817 int repbits;
818 if (w == 0 || h == 0) {
819 repbits = ImageObserver.ALLBITS;
820 } else {
821 repbits = tkimg.getImageRep().check(o);
822 }
823 return (tkimg.check(o) | repbits) & checkResolutionVariant(img, w, h, o);
824 }
825
826 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
827 if (w == 0 || h == 0) {
828 return true;
829 }
830
831 // Must be a ToolkitImage
832 if (!(img instanceof ToolkitImage)) {
833 return true;
834 }
835
836 ToolkitImage tkimg = (ToolkitImage)img;
837 if (tkimg.hasError()) {
838 if (o != null) {
839 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
840 -1, -1, -1, -1);
841 }
842 return false;
843 }
844 ImageRepresentation ir = tkimg.getImageRep();
845 return ir.prepare(o) & prepareResolutionVariant(img, w, h, o);
846 }
847
848 private int checkResolutionVariant(Image img, int w, int h, ImageObserver o) {
849 ToolkitImage rvImage = getResolutionVariant(img);
850 int rvw = getRVSize(w);
851 int rvh = getRVSize(h);
852 // Ignore the resolution variant in case of error
853 return (rvImage == null || rvImage.hasError()) ? 0xFFFF :
854 checkImage(rvImage, rvw, rvh, MultiResolutionToolkitImage.
855 getResolutionVariantObserver(
856 img, o, w, h, rvw, rvh, true));
857 }
858
859 private boolean prepareResolutionVariant(Image img, int w, int h,
860 ImageObserver o) {
861
862 ToolkitImage rvImage = getResolutionVariant(img);
863 int rvw = getRVSize(w);
864 int rvh = getRVSize(h);
865 // Ignore the resolution variant in case of error
866 return rvImage == null || rvImage.hasError() || prepareImage(
867 rvImage, rvw, rvh,
868 MultiResolutionToolkitImage.getResolutionVariantObserver(
869 img, o, w, h, rvw, rvh, true));
870 }
871
872 private static int getRVSize(int size){
873 return size == -1 ? -1 : 2 * size;
874 }
875
876 private static ToolkitImage getResolutionVariant(Image image) {
877 if (image instanceof MultiResolutionToolkitImage) {
878 Image resolutionVariant = ((MultiResolutionToolkitImage) image).
879 getResolutionVariant();
880 if (resolutionVariant instanceof ToolkitImage) {
881 return (ToolkitImage) resolutionVariant;
882 }
883 }
884 return null;
885 }
886
887 protected static boolean imageCached(Object key) {
888 return imgCache.containsKey(key);
889 }
890
891 protected static boolean imageExists(String filename) {
892 checkPermissions(filename);
893 return filename != null && new File(filename).exists();
894 }
895
896 @SuppressWarnings("try")
897 protected static boolean imageExists(URL url) {
898 checkPermissions(url);
899 if (url != null) {
900 try (InputStream is = url.openStream()) {
901 return true;
902 }catch(IOException e){
903 return false;
904 }
905 }
906 return false;
907 }
908
909 private static void checkPermissions(String filename) {
910 SecurityManager security = System.getSecurityManager();
911 if (security != null) {
912 security.checkRead(filename);
913 }
914 }
915
916 private static void checkPermissions(URL url) {
917 SecurityManager sm = System.getSecurityManager();
918 if (sm != null) {
919 try {
920 java.security.Permission perm =
921 url.openConnection().getPermission();
922 if (perm != null) {
923 try {
924 sm.checkPermission(perm);
925 } catch (SecurityException se) {
926 // fallback to checkRead/checkConnect for pre 1.2
927 // security managers
928 if ((perm instanceof java.io.FilePermission) &&
929 perm.getActions().indexOf("read") != -1) {
930 sm.checkRead(perm.getName());
931 } else if ((perm instanceof
932 java.net.SocketPermission) &&
933 perm.getActions().indexOf("connect") != -1) {
934 sm.checkConnect(url.getHost(), url.getPort());
935 } else {
936 throw se;
937 }
938 }
939 }
940 } catch (java.io.IOException ioe) {
941 sm.checkConnect(url.getHost(), url.getPort());
942 }
943 }
944 }
945
946 /**
947 * Scans {@code imageList} for best-looking image of specified dimensions.
948 * Image can be scaled and/or padded with transparency.
949 */
950 public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
951 if (width == 0 || height == 0) {
952 return null;
953 }
954 Image bestImage = null;
955 int bestWidth = 0;
956 int bestHeight = 0;
957 double bestSimilarity = 3; //Impossibly high value
958 double bestScaleFactor = 0;
959 for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
960 //Iterate imageList looking for best matching image.
961 //'Similarity' measure is defined as good scale factor and small insets.
962 //best possible similarity is 0 (no scale, no insets).
963 //It's found while the experiments that good-looking result is achieved
964 //with scale factors x1, x3/4, x2/3, xN, x1/N.
965 Image im = i.next();
966 if (im == null) {
967 continue;
968 }
969 if (im instanceof ToolkitImage) {
970 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
971 ir.reconstruct(ImageObserver.ALLBITS);
972 }
973 int iw;
974 int ih;
975 try {
976 iw = im.getWidth(null);
977 ih = im.getHeight(null);
978 } catch (Exception e){
979 continue;
980 }
981 if (iw > 0 && ih > 0) {
982 //Calc scale factor
983 double scaleFactor = Math.min((double)width / (double)iw,
984 (double)height / (double)ih);
985 //Calculate scaled image dimensions
986 //adjusting scale factor to nearest "good" value
987 int adjw = 0;
988 int adjh = 0;
989 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
990 if (scaleFactor >= 2) {
991 //Need to enlarge image more than twice
992 //Round down scale factor to multiply by integer value
993 scaleFactor = Math.floor(scaleFactor);
994 adjw = iw * (int)scaleFactor;
995 adjh = ih * (int)scaleFactor;
996 scaleMeasure = 1.0 - 0.5 / scaleFactor;
997 } else if (scaleFactor >= 1) {
998 //Don't scale
999 scaleFactor = 1.0;
1000 adjw = iw;
1001 adjh = ih;
1002 scaleMeasure = 0;
1003 } else if (scaleFactor >= 0.75) {
1004 //Multiply by 3/4
1005 scaleFactor = 0.75;
1006 adjw = iw * 3 / 4;
1007 adjh = ih * 3 / 4;
1008 scaleMeasure = 0.3;
1009 } else if (scaleFactor >= 0.6666) {
1010 //Multiply by 2/3
1011 scaleFactor = 0.6666;
1012 adjw = iw * 2 / 3;
1013 adjh = ih * 2 / 3;
1014 scaleMeasure = 0.33;
1015 } else {
1016 //Multiply size by 1/scaleDivider
1017 //where scaleDivider is minimum possible integer
1018 //larger than 1/scaleFactor
1019 double scaleDivider = Math.ceil(1.0 / scaleFactor);
1020 scaleFactor = 1.0 / scaleDivider;
1021 adjw = (int)Math.round((double)iw / scaleDivider);
1022 adjh = (int)Math.round((double)ih / scaleDivider);
1023 scaleMeasure = 1.0 - 1.0 / scaleDivider;
1024 }
1025 double similarity = ((double)width - (double)adjw) / (double)width +
1026 ((double)height - (double)adjh) / (double)height + //Large padding is bad
1027 scaleMeasure; //Large rescale is bad
1028 if (similarity < bestSimilarity) {
1029 bestSimilarity = similarity;
1030 bestScaleFactor = scaleFactor;
1031 bestImage = im;
1032 bestWidth = adjw;
1033 bestHeight = adjh;
1034 }
1035 if (similarity == 0) break;
1036 }
1037 }
1038 if (bestImage == null) {
1039 //No images were found, possibly all are broken
1040 return null;
1041 }
1042 BufferedImage bimage =
1043 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
1044 Graphics2D g = bimage.createGraphics();
1045 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
1046 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
1047 try {
1048 int x = (width - bestWidth) / 2;
1049 int y = (height - bestHeight) / 2;
1050 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
1051 } finally {
1052 g.dispose();
1053 }
1054 return bimage;
1055 }
1056
1057 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
1058 BufferedImage bimage = getScaledIconImage(imageList, width, height);
1059 if (bimage == null) {
1060 return null;
1061 }
1062 Raster raster = bimage.getRaster();
1063 DataBuffer buffer = raster.getDataBuffer();
1064 return (DataBufferInt)buffer;
1065 }
1066
1067 protected EventQueue getSystemEventQueueImpl() {
1068 return getSystemEventQueueImplPP();
1069 }
1070
1071 // Package private implementation
1072 static EventQueue getSystemEventQueueImplPP() {
1073 return getSystemEventQueueImplPP(AppContext.getAppContext());
1074 }
1075
1076 public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1077 EventQueue theEventQueue =
1078 (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1079 return theEventQueue;
1080 }
1081
1082 /**
1083 * Give native peers the ability to query the native container
1084 * given a native component (eg the direct parent may be lightweight).
1085 */
1086 public static Container getNativeContainer(Component c) {
1087 return Toolkit.getNativeContainer(c);
1088 }
1089
1090 /**
1091 * Gives native peers the ability to query the closest HW component.
1092 * If the given component is heavyweight, then it returns this. Otherwise,
1093 * it goes one level up in the hierarchy and tests next component.
1094 */
1095 public static Component getHeavyweightComponent(Component c) {
1096 while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1097 c = AWTAccessor.getComponentAccessor().getParent(c);
1098 }
1099 return c;
1100 }
1101
1102 /**
1103 * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1104 */
1105 public int getFocusAcceleratorKeyMask() {
1106 return InputEvent.ALT_MASK;
1107 }
1108
1109 /**
1110 * Tests whether specified key modifiers mask can be used to enter a printable
1111 * character. This is a default implementation of this method, which reflects
1112 * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1113 * characters from the extended character set (like euro sign or math symbols)
1114 */
1115 public boolean isPrintableCharacterModifiersMask(int mods) {
1116 return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1117 }
1118
1119 /**
1120 * Returns whether popup is allowed to be shown above the task bar.
1121 * This is a default implementation of this method, which checks
1122 * corresponding security permission.
1123 */
1124 public boolean canPopupOverlapTaskBar() {
1125 boolean result = true;
1126 try {
1127 SecurityManager sm = System.getSecurityManager();
1128 if (sm != null) {
1129 sm.checkPermission(AWTPermissions.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1130 }
1131 } catch (SecurityException se) {
1132 // There is no permission to show popups over the task bar
1133 result = false;
1134 }
1135 return result;
1136 }
1137
1138 /**
1139 * Returns a new input method window, with behavior as specified in
1140 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1141 * If the inputContext is not null, the window should return it from its
1142 * getInputContext() method. The window needs to implement
1143 * sun.awt.im.InputMethodWindow.
1144 * <p>
1145 * SunToolkit subclasses can override this method to return better input
1146 * method windows.
1147 */
1148 public Window createInputMethodWindow(String title, InputContext context) {
1149 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1150 }
1151
1152 /**
1153 * Returns whether enableInputMethods should be set to true for peered
1154 * TextComponent instances on this platform. False by default.
1155 */
1156 public boolean enableInputMethodsForTextComponent() {
1157 return false;
1158 }
1159
1160 private static Locale startupLocale = null;
1161
1162 /**
1163 * Returns the locale in which the runtime was started.
1164 */
1165 public static Locale getStartupLocale() {
1166 if (startupLocale == null) {
1167 String language, region, country, variant;
1168 language = AccessController.doPrivileged(
1169 new GetPropertyAction("user.language", "en"));
1170 // for compatibility, check for old user.region property
1171 region = AccessController.doPrivileged(
1172 new GetPropertyAction("user.region"));
1173 if (region != null) {
1174 // region can be of form country, country_variant, or _variant
1175 int i = region.indexOf('_');
1176 if (i >= 0) {
1177 country = region.substring(0, i);
1178 variant = region.substring(i + 1);
1179 } else {
1180 country = region;
1181 variant = "";
1182 }
1183 } else {
1184 country = AccessController.doPrivileged(
1185 new GetPropertyAction("user.country", ""));
1186 variant = AccessController.doPrivileged(
1187 new GetPropertyAction("user.variant", ""));
1188 }
1189 startupLocale = new Locale(language, country, variant);
1190 }
1191 return startupLocale;
1192 }
1193
1194 /**
1195 * Returns the default keyboard locale of the underlying operating system
1196 */
1197 public Locale getDefaultKeyboardLocale() {
1198 return getStartupLocale();
1199 }
1200
1201 private static DefaultMouseInfoPeer mPeer = null;
1202
1203 protected synchronized MouseInfoPeer getMouseInfoPeer() {
1204 if (mPeer == null) {
1205 mPeer = new DefaultMouseInfoPeer();
1206 }
1207 return mPeer;
1208 }
1209
1210
1211 /**
1212 * Returns whether default toolkit needs the support of the xembed
1213 * from embedding host(if any).
1214 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1215 */
1216 public static boolean needsXEmbed() {
1217 String noxembed = AccessController.
1218 doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1219 if ("true".equals(noxembed)) {
1220 return false;
1221 }
1222
1223 Toolkit tk = Toolkit.getDefaultToolkit();
1224 if (tk instanceof SunToolkit) {
1225 // SunToolkit descendants should override this method to specify
1226 // concrete behavior
1227 return ((SunToolkit)tk).needsXEmbedImpl();
1228 } else {
1229 // Non-SunToolkit doubtly might support XEmbed
1230 return false;
1231 }
1232 }
1233
1234 /**
1235 * Returns whether this toolkit needs the support of the xembed
1236 * from embedding host(if any).
1237 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1238 */
1239 protected boolean needsXEmbedImpl() {
1240 return false;
1241 }
1242
1243 private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1244
1245 /**
1246 * Returns whether the XEmbed server feature is requested by
1247 * developer. If true, Toolkit should return an
1248 * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1249 */
1250 protected final boolean isXEmbedServerRequested() {
1251 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1252 }
1253
1254 /**
1255 * Returns whether the modal exclusion API is supported by the current toolkit.
1256 * When it isn't supported, calling <code>setModalExcluded</code> has no
1257 * effect, and <code>isModalExcluded</code> returns false for all windows.
1258 *
1259 * @return true if modal exclusion is supported by the toolkit, false otherwise
1260 *
1261 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1262 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1263 *
1264 * @since 1.5
1265 */
1266 public static boolean isModalExcludedSupported()
1267 {
1268 Toolkit tk = Toolkit.getDefaultToolkit();
1269 return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1270 }
1271 /*
1272 * Default implementation for isModalExcludedSupportedImpl(), returns false.
1273 *
1274 * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1275 * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1276 *
1277 * @since 1.5
1278 */
1279 protected boolean isModalExcludedSupportedImpl()
1280 {
1281 return false;
1282 }
1283
1284 /*
1285 * Sets this window to be excluded from being modally blocked. When the
1286 * toolkit supports modal exclusion and this method is called, input
1287 * events, focus transfer and z-order will continue to work for the
1288 * window, it's owned windows and child components, even in the
1289 * presence of a modal dialog.
1290 * For details on which <code>Window</code>s are normally blocked
1291 * by modal dialog, see {@link java.awt.Dialog}.
1292 * Invoking this method when the modal exclusion API is not supported by
1293 * the current toolkit has no effect.
1294 * @param window Window to be marked as not modally blocked
1295 * @see java.awt.Dialog
1296 * @see java.awt.Dialog#setModal(boolean)
1297 * @see sun.awt.SunToolkit#isModalExcludedSupported
1298 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1299 */
1300 public static void setModalExcluded(Window window)
1301 {
1302 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1303 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1304 }
1305 window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1306 }
1307
1308 /*
1309 * Returns whether the specified window is blocked by modal dialogs.
1310 * If the modal exclusion API isn't supported by the current toolkit,
1311 * it returns false for all windows.
1312 *
1313 * @param window Window to test for modal exclusion
1314 *
1315 * @return true if the window is modal excluded, false otherwise. If
1316 * the modal exclusion isn't supported by the current Toolkit, false
1317 * is returned
1318 *
1319 * @see sun.awt.SunToolkit#isModalExcludedSupported
1320 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1321 *
1322 * @since 1.5
1323 */
1324 public static boolean isModalExcluded(Window window)
1325 {
1326 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1327 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1328 }
1329 return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1330 }
1331
1332 /**
1333 * Overridden in XToolkit and WToolkit
1334 */
1335 public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1336 return (modalityType == Dialog.ModalityType.MODELESS) ||
1337 (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1338 }
1339
1340 /**
1341 * Overridden in XToolkit and WToolkit
1342 */
1343 public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1344 return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1345 }
1346
1347 ///////////////////////////////////////////////////////////////////////////
1348 //
1349 // The following is used by the Java Plug-in to coordinate dialog modality
1350 // between containing applications (browsers, ActiveX containers etc) and
1351 // the AWT.
1352 //
1353 ///////////////////////////////////////////////////////////////////////////
1354
1355 private ModalityListenerList modalityListeners = new ModalityListenerList();
1356
1357 public void addModalityListener(ModalityListener listener) {
1358 modalityListeners.add(listener);
1359 }
1360
1361 public void removeModalityListener(ModalityListener listener) {
1362 modalityListeners.remove(listener);
1363 }
1364
1365 public void notifyModalityPushed(Dialog dialog) {
1366 notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1367 }
1368
1369 public void notifyModalityPopped(Dialog dialog) {
1370 notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1371 }
1372
1373 final void notifyModalityChange(int id, Dialog source) {
1374 ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1375 ev.dispatch();
1376 }
1377
1378 static class ModalityListenerList implements ModalityListener {
1379
1380 Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1381
1382 void add(ModalityListener listener) {
1383 listeners.addElement(listener);
1384 }
1385
1386 void remove(ModalityListener listener) {
1387 listeners.removeElement(listener);
1388 }
1389
1390 public void modalityPushed(ModalityEvent ev) {
1391 Iterator<ModalityListener> it = listeners.iterator();
1392 while (it.hasNext()) {
1393 it.next().modalityPushed(ev);
1394 }
1395 }
1396
1397 public void modalityPopped(ModalityEvent ev) {
1398 Iterator<ModalityListener> it = listeners.iterator();
1399 while (it.hasNext()) {
1400 it.next().modalityPopped(ev);
1401 }
1402 }
1403 } // end of class ModalityListenerList
1404
1405 ///////////////////////////////////////////////////////////////////////////
1406 // End Plug-in code
1407 ///////////////////////////////////////////////////////////////////////////
1408
1409 public static boolean isLightweightOrUnknown(Component comp) {
1410 if (comp.isLightweight()
1411 || !(getDefaultToolkit() instanceof SunToolkit))
1412 {
1413 return true;
1414 }
1415 return !(comp instanceof Button
1416 || comp instanceof Canvas
1417 || comp instanceof Checkbox
1418 || comp instanceof Choice
1419 || comp instanceof Label
1420 || comp instanceof java.awt.List
1421 || comp instanceof Panel
1422 || comp instanceof Scrollbar
1423 || comp instanceof ScrollPane
1424 || comp instanceof TextArea
1425 || comp instanceof TextField
1426 || comp instanceof Window);
1427 }
1428
1429 @SuppressWarnings("serial")
1430 public static class OperationTimedOut extends RuntimeException {
1431 public OperationTimedOut(String msg) {
1432 super(msg);
1433 }
1434 public OperationTimedOut() {
1435 }
1436 }
1437
1438 @SuppressWarnings("serial")
1439 public static class InfiniteLoop extends RuntimeException {
1440 }
1441
1442 @SuppressWarnings("serial")
1443 public static class IllegalThreadException extends RuntimeException {
1444 public IllegalThreadException(String msg) {
1445 super(msg);
1446 }
1447 public IllegalThreadException() {
1448 }
1449 }
1450
1451 public static final int DEFAULT_WAIT_TIME = 10000;
1452 private static final int MAX_ITERS = 20;
1453 private static final int MIN_ITERS = 0;
1454 private static final int MINIMAL_EDELAY = 0;
1455
1456 /**
1457 * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1458 */
1459 public void realSync() throws OperationTimedOut, InfiniteLoop {
1460 realSync(DEFAULT_WAIT_TIME);
1461 }
1462
1463 /**
1464 * Forces toolkit to synchronize with the native windowing
1465 * sub-system, flushing all pending work and waiting for all the
1466 * events to be processed. This method guarantees that after
1467 * return no additional Java events will be generated, unless
1468 * cause by user. Obviously, the method cannot be used on the
1469 * event dispatch thread (EDT). In case it nevertheless gets
1470 * invoked on this thread, the method throws the
1471 * IllegalThreadException runtime exception.
1472 *
1473 * <p> This method allows to write tests without explicit timeouts
1474 * or wait for some event. Example:
1475 * <code>
1476 * Frame f = ...;
1477 * f.setVisible(true);
1478 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1479 * </code>
1480 *
1481 * <p> After realSync, <code>f</code> will be completely visible
1482 * on the screen, its getLocationOnScreen will be returning the
1483 * right result and it will be the focus owner.
1484 *
1485 * <p> Another example:
1486 * <code>
1487 * b.requestFocus();
1488 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1489 * </code>
1490 *
1491 * <p> After realSync, <code>b</code> will be focus owner.
1492 *
1493 * <p> Notice that realSync isn't guaranteed to work if recurring
1494 * actions occur, such as if during processing of some event
1495 * another request which may generate some events occurs. By
1496 * default, sync tries to perform as much as {@value MAX_ITERS}
1497 * cycles of event processing, allowing for roughly {@value
1498 * MAX_ITERS} additional requests.
1499 *
1500 * <p> For example, requestFocus() generates native request, which
1501 * generates one or two Java focus events, which then generate a
1502 * serie of paint events, a serie of Java focus events, which then
1503 * generate a serie of paint events which then are processed -
1504 * three cycles, minimum.
1505 *
1506 * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1507 */
1508 public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1509 {
1510 if (EventQueue.isDispatchThread()) {
1511 throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1512 }
1513 int bigLoop = 0;
1514 do {
1515 // Let's do sync first
1516 sync();
1517
1518 // During the wait process, when we were processing incoming
1519 // events, we could have made some new request, which can
1520 // generate new events. Example: MapNotify/XSetInputFocus.
1521 // Therefore, we dispatch them as long as there is something
1522 // to dispatch.
1523 int iters = 0;
1524 while (iters < MIN_ITERS) {
1525 syncNativeQueue(timeout);
1526 iters++;
1527 }
1528 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1529 iters++;
1530 }
1531 if (iters >= MAX_ITERS) {
1532 throw new InfiniteLoop();
1533 }
1534
1535 // native requests were dispatched by X/Window Manager or Windows
1536 // Moreover, we processed them all on Toolkit thread
1537 // Now wait while EDT processes them.
1538 //
1539 // During processing of some events (focus, for example),
1540 // some other events could have been generated. So, after
1541 // waitForIdle, we may end up with full EventQueue
1542 iters = 0;
1543 while (iters < MIN_ITERS) {
1544 waitForIdle(timeout);
1545 iters++;
1546 }
1547 while (waitForIdle(timeout) && iters < MAX_ITERS) {
1548 iters++;
1549 }
1550 if (iters >= MAX_ITERS) {
1551 throw new InfiniteLoop();
1552 }
1553
1554 bigLoop++;
1555 // Again, for Java events, it was simple to check for new Java
1556 // events by checking event queue, but what if Java events
1557 // resulted in native requests? Therefor, check native events again.
1558 } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1559 }
1560
1561 /**
1562 * Platform toolkits need to implement this method to perform the
1563 * sync of the native queue. The method should wait until native
1564 * requests are processed, all native events are processed and
1565 * corresponding Java events are generated. Should return
1566 * <code>true</code> if some events were processed,
1567 * <code>false</code> otherwise.
1568 */
1569 protected abstract boolean syncNativeQueue(final long timeout);
1570
1571 private boolean eventDispatched = false;
1572 private boolean queueEmpty = false;
1573 private final Object waitLock = "Wait Lock";
1574
1575 private boolean isEQEmpty() {
1576 EventQueue queue = getSystemEventQueueImpl();
1577 return AWTAccessor.getEventQueueAccessor().noEvents(queue);
1578 }
1579
1580 /**
1581 * Waits for the Java event queue to empty. Ensures that all
1582 * events are processed (including paint events), and that if
1583 * recursive events were generated, they are also processed.
1584 * Should return <code>true</code> if more processing is
1585 * necessary, <code>false</code> otherwise.
1586 */
1587 @SuppressWarnings("serial")
1588 protected final boolean waitForIdle(final long timeout) {
1589 flushPendingEvents();
1590 boolean queueWasEmpty = isEQEmpty();
1591 queueEmpty = false;
1592 eventDispatched = false;
1593 synchronized(waitLock) {
1594 postEvent(AppContext.getAppContext(),
1595 new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1596 public void dispatch() {
1597 // Here we block EDT. It could have some
1598 // events, it should have dispatched them by
1599 // now. So native requests could have been
1600 // generated. First, dispatch them. Then,
1601 // flush Java events again.
1602 int iters = 0;
1603 while (iters < MIN_ITERS) {
1604 syncNativeQueue(timeout);
1605 iters++;
1606 }
1607 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1608 iters++;
1609 }
1610 flushPendingEvents();
1611
1612 synchronized(waitLock) {
1613 queueEmpty = isEQEmpty();
1614 eventDispatched = true;
1615 waitLock.notifyAll();
1616 }
1617 }
1618 });
1619 try {
1620 while (!eventDispatched) {
1621 waitLock.wait();
1622 }
1623 } catch (InterruptedException ie) {
1624 return false;
1625 }
1626 }
1627
1628 try {
1629 Thread.sleep(MINIMAL_EDELAY);
1630 } catch (InterruptedException ie) {
1631 throw new RuntimeException("Interrupted");
1632 }
1633
1634 flushPendingEvents();
1635
1636 // Lock to force write-cache flush for queueEmpty.
1637 synchronized (waitLock) {
1638 return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1639 }
1640 }
1641
1642 /**
1643 * Grabs the mouse input for the given window. The window must be
1644 * visible. The window or its children do not receive any
1645 * additional mouse events besides those targeted to them. All
1646 * other events will be dispatched as before - to the respective
1647 * targets. This Window will receive UngrabEvent when automatic
1648 * ungrab is about to happen. The event can be listened to by
1649 * installing AWTEventListener with WINDOW_EVENT_MASK. See
1650 * UngrabEvent class for the list of conditions when ungrab is
1651 * about to happen.
1652 * @see UngrabEvent
1653 */
1654 public abstract void grab(Window w);
1655
1656 /**
1657 * Forces ungrab. No event will be sent.
1658 */
1659 public abstract void ungrab(Window w);
1660
1661
1662 /**
1663 * Locates the splash screen library in a platform dependent way and closes
1664 * the splash screen. Should be invoked on first top-level frame display.
1665 * @see java.awt.SplashScreen
1666 * @since 1.6
1667 */
1668 public static native void closeSplashScreen();
1669
1670 /* The following methods and variables are to support retrieving
1671 * desktop text anti-aliasing settings
1672 */
1673
1674 /* Need an instance method because setDesktopProperty(..) is protected. */
1675 private void fireDesktopFontPropertyChanges() {
1676 setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1677 SunToolkit.getDesktopFontHints());
1678 }
1679
1680 private static boolean checkedSystemAAFontSettings;
1681 private static boolean useSystemAAFontSettings;
1682 private static boolean lastExtraCondition = true;
1683 private static RenderingHints desktopFontHints;
1684
1685 /* Since Swing is the reason for this "extra condition" logic its
1686 * worth documenting it in some detail.
1687 * First, a goal is for Swing and applications to both retrieve and
1688 * use the same desktop property value so that there is complete
1689 * consistency between the settings used by JDK's Swing implementation
1690 * and 3rd party custom Swing components, custom L&Fs and any general
1691 * text rendering that wants to be consistent with these.
1692 * But by default on Solaris & Linux Swing will not use AA text over
1693 * remote X11 display (unless Xrender can be used which is TBD and may not
1694 * always be available anyway) as that is a noticeable performance hit.
1695 * So there needs to be a way to express that extra condition so that
1696 * it is seen by all clients of the desktop property API.
1697 * If this were the only condition it could be handled here as it would
1698 * be the same for any L&F and could reasonably be considered to be
1699 * a static behaviour of those systems.
1700 * But GTK currently has an additional test based on locale which is
1701 * not applied by Metal. So mixing GTK in a few locales with Metal
1702 * would mean the last one wins.
1703 * This could be stored per-app context which would work
1704 * for different applets, but wouldn't help for a single application
1705 * using GTK and some other L&F concurrently.
1706 * But it is expected this will be addressed within GTK and the font
1707 * system so is a temporary and somewhat unlikely harmless corner case.
1708 */
1709 public static void setAAFontSettingsCondition(boolean extraCondition) {
1710 if (extraCondition != lastExtraCondition) {
1711 lastExtraCondition = extraCondition;
1712 if (checkedSystemAAFontSettings) {
1713 /* Someone already asked for this info, under a different
1714 * condition.
1715 * We'll force re-evaluation instead of replicating the
1716 * logic, then notify any listeners of any change.
1717 */
1718 checkedSystemAAFontSettings = false;
1719 Toolkit tk = Toolkit.getDefaultToolkit();
1720 if (tk instanceof SunToolkit) {
1721 ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1722 }
1723 }
1724 }
1725 }
1726
1727 /* "false", "off", ""default" aren't explicitly tested, they
1728 * just fall through to produce a null return which all are equated to
1729 * "false".
1730 */
1731 private static RenderingHints getDesktopAAHintsByName(String hintname) {
1732 Object aaHint = null;
1733 hintname = hintname.toLowerCase(Locale.ENGLISH);
1734 if (hintname.equals("on")) {
1735 aaHint = VALUE_TEXT_ANTIALIAS_ON;
1736 } else if (hintname.equals("gasp")) {
1737 aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1738 } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1739 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1740 } else if (hintname.equals("lcd_hbgr")) {
1741 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1742 } else if (hintname.equals("lcd_vrgb")) {
1743 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1744 } else if (hintname.equals("lcd_vbgr")) {
1745 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1746 }
1747 if (aaHint != null) {
1748 RenderingHints map = new RenderingHints(null);
1749 map.put(KEY_TEXT_ANTIALIASING, aaHint);
1750 return map;
1751 } else {
1752 return null;
1753 }
1754 }
1755
1756 /* This method determines whether to use the system font settings,
1757 * or ignore them if a L&F has specified they should be ignored, or
1758 * to override both of these with a system property specified value.
1759 * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1760 * system property isn't applied as desktop properties are considered
1761 * to be inapplicable in that case. In that headless case although
1762 * this method will return "true" the toolkit will return a null map.
1763 */
1764 private static boolean useSystemAAFontSettings() {
1765 if (!checkedSystemAAFontSettings) {
1766 useSystemAAFontSettings = true; /* initially set this true */
1767 String systemAAFonts = null;
1768 Toolkit tk = Toolkit.getDefaultToolkit();
1769 if (tk instanceof SunToolkit) {
1770 systemAAFonts =
1771 AccessController.doPrivileged(
1772 new GetPropertyAction("awt.useSystemAAFontSettings"));
1773 }
1774 if (systemAAFonts != null) {
1775 useSystemAAFontSettings =
1776 Boolean.valueOf(systemAAFonts).booleanValue();
1777 /* If it is anything other than "true", then it may be
1778 * a hint name , or it may be "off, "default", etc.
1779 */
1780 if (!useSystemAAFontSettings) {
1781 desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1782 }
1783 }
1784 /* If its still true, apply the extra condition */
1785 if (useSystemAAFontSettings) {
1786 useSystemAAFontSettings = lastExtraCondition;
1787 }
1788 checkedSystemAAFontSettings = true;
1789 }
1790 return useSystemAAFontSettings;
1791 }
1792
1793 /* A variable defined for the convenience of JDK code */
1794 public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1795
1796 /* Overridden by subclasses to return platform/desktop specific values */
1797 protected RenderingHints getDesktopAAHints() {
1798 return null;
1799 }
1800
1801 /* Subclass desktop property loading methods call this which
1802 * in turn calls the appropriate subclass implementation of
1803 * getDesktopAAHints() when system settings are being used.
1804 * Its public rather than protected because subclasses may delegate
1805 * to a helper class.
1806 */
1807 public static RenderingHints getDesktopFontHints() {
1808 if (useSystemAAFontSettings()) {
1809 Toolkit tk = Toolkit.getDefaultToolkit();
1810 if (tk instanceof SunToolkit) {
1811 Object map = ((SunToolkit)tk).getDesktopAAHints();
1812 return (RenderingHints)map;
1813 } else { /* Headless Toolkit */
1814 return null;
1815 }
1816 } else if (desktopFontHints != null) {
1817 /* cloning not necessary as the return value is cloned later, but
1818 * its harmless.
1819 */
1820 return (RenderingHints)(desktopFontHints.clone());
1821 } else {
1822 return null;
1823 }
1824 }
1825
1826
1827 public abstract boolean isDesktopSupported();
1828
1829 /*
1830 * consumeNextKeyTyped() method is not currently used,
1831 * however Swing could use it in the future.
1832 */
1833 public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1834 try {
1835 AWTAccessor.getDefaultKeyboardFocusManagerAccessor().consumeNextKeyTyped(
1836 (DefaultKeyboardFocusManager)KeyboardFocusManager.
1837 getCurrentKeyboardFocusManager(),
1838 keyEvent);
1839 } catch (ClassCastException cce) {
1840 cce.printStackTrace();
1841 }
1842 }
1843
1844 protected static void dumpPeers(final PlatformLogger aLog) {
1845 AWTAutoShutdown.getInstance().dumpPeers(aLog);
1846 }
1847
1848 /**
1849 * Returns the <code>Window</code> ancestor of the component <code>comp</code>.
1850 * @return Window ancestor of the component or component by itself if it is Window;
1851 * null, if component is not a part of window hierarchy
1852 */
1853 public static Window getContainingWindow(Component comp) {
1854 while (comp != null && !(comp instanceof Window)) {
1855 comp = comp.getParent();
1856 }
1857 return (Window)comp;
1858 }
1859
1860 private static Boolean sunAwtDisableMixing = null;
1861
1862 /**
1863 * Returns the value of "sun.awt.disableMixing" property. Default
1864 * value is {@code false}.
1865 */
1866 public synchronized static boolean getSunAwtDisableMixing() {
1867 if (sunAwtDisableMixing == null) {
1868 sunAwtDisableMixing = AccessController.doPrivileged(
1869 new GetBooleanAction("sun.awt.disableMixing"));
1870 }
1871 return sunAwtDisableMixing.booleanValue();
1872 }
1873
1874 /**
1875 * Returns true if the native GTK libraries are available. The
1876 * default implementation returns false, but UNIXToolkit overrides this
1877 * method to provide a more specific answer.
1878 */
1879 public boolean isNativeGTKAvailable() {
1880 return false;
1881 }
1882
1883 private static final Object DEACTIVATION_TIMES_MAP_KEY = new Object();
1884
1885 public synchronized void setWindowDeactivationTime(Window w, long time) {
1886 AppContext ctx = getAppContext(w);
1887 @SuppressWarnings("unchecked")
1888 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1889 if (map == null) {
1890 map = new WeakHashMap<Window, Long>();
1891 ctx.put(DEACTIVATION_TIMES_MAP_KEY, map);
1892 }
1893 map.put(w, time);
1894 }
1895
1896 public synchronized long getWindowDeactivationTime(Window w) {
1897 AppContext ctx = getAppContext(w);
1898 @SuppressWarnings("unchecked")
1899 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1900 if (map == null) {
1901 return -1;
1902 }
1903 Long time = map.get(w);
1904 return time == null ? -1 : time;
1905 }
1906
1907 // Cosntant alpha
1908 public boolean isWindowOpacitySupported() {
1909 return false;
1910 }
1911
1912 // Shaping
1913 public boolean isWindowShapingSupported() {
1914 return false;
1915 }
1916
1917 // Per-pixel alpha
1918 public boolean isWindowTranslucencySupported() {
1919 return false;
1920 }
1921
1922 public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1923 return false;
1924 }
1925
1926 /**
1927 * Returns true if swing backbuffer should be translucent.
1928 */
1929 public boolean isSwingBackbufferTranslucencySupported() {
1930 return false;
1931 }
1932
1933 /**
1934 * Returns whether or not a containing top level window for the passed
1935 * component is
1936 * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1937 *
1938 * @param c a Component which toplevel's to check
1939 * @return {@code true} if the passed component is not null and has a
1940 * containing toplevel window which is opaque (so per-pixel translucency
1941 * is not enabled), {@code false} otherwise
1942 * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1943 */
1944 public static boolean isContainingTopLevelOpaque(Component c) {
1945 Window w = getContainingWindow(c);
1946 return w != null && w.isOpaque();
1947 }
1948
1949 /**
1950 * Returns whether or not a containing top level window for the passed
1951 * component is
1952 * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1953 *
1954 * @param c a Component which toplevel's to check
1955 * @return {@code true} if the passed component is not null and has a
1956 * containing toplevel window which has opacity less than
1957 * 1.0f (which means that it is translucent), {@code false} otherwise
1958 * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1959 */
1960 public static boolean isContainingTopLevelTranslucent(Component c) {
1961 Window w = getContainingWindow(c);
1962 return w != null && w.getOpacity() < 1.0f;
1963 }
1964
1965 /**
1966 * Returns whether the native system requires using the peer.updateWindow()
1967 * method to update the contents of a non-opaque window, or if usual
1968 * painting procedures are sufficient. The default return value covers
1969 * the X11 systems. On MS Windows this method is overriden in WToolkit
1970 * to return true.
1971 */
1972 public boolean needUpdateWindow() {
1973 return false;
1974 }
1975
1976 /**
1977 * Descendants of the SunToolkit should override and put their own logic here.
1978 */
1979 public int getNumberOfButtons(){
1980 return 3;
1981 }
1982
1983 /**
1984 * Checks that the given object implements/extends the given
1985 * interface/class.
1986 *
1987 * Note that using the instanceof operator causes a class to be loaded.
1988 * Using this method doesn't load a class and it can be used instead of
1989 * the instanceof operator for performance reasons.
1990 *
1991 * @param obj Object to be checked
1992 * @param type The name of the interface/class. Must be
1993 * fully-qualified interface/class name.
1994 * @return true, if this object implements/extends the given
1995 * interface/class, false, otherwise, or if obj or type is null
1996 */
1997 public static boolean isInstanceOf(Object obj, String type) {
1998 if (obj == null) return false;
1999 if (type == null) return false;
2000
2001 return isInstanceOf(obj.getClass(), type);
2002 }
2003
2004 private static boolean isInstanceOf(Class<?> cls, String type) {
2005 if (cls == null) return false;
2006
2007 if (cls.getName().equals(type)) {
2008 return true;
2009 }
2010
2011 for (Class<?> c : cls.getInterfaces()) {
2012 if (c.getName().equals(type)) {
2013 return true;
2014 }
2015 }
2016 return isInstanceOf(cls.getSuperclass(), type);
2017 }
2018
2019 ///////////////////////////////////////////////////////////////////////////
2020 //
2021 // The following methods help set and identify whether a particular
2022 // AWTEvent object was produced by the system or by user code. As of this
2023 // writing the only consumer is the Java Plug-In, although this information
2024 // could be useful to more clients and probably should be formalized in
2025 // the public API.
2026 //
2027 ///////////////////////////////////////////////////////////////////////////
2028
2029 public static void setSystemGenerated(AWTEvent e) {
2030 AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2031 }
2032
2033 public static boolean isSystemGenerated(AWTEvent e) {
2034 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2035 }
2036
2037 } // class SunToolkit
2038
2039
2040 /*
2041 * PostEventQueue is a Thread that runs in the same AppContext as the
2042 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2043 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2044 * events to this queue, which then calls EventQueue.postEvent().
2045 *
2046 * We do this because EventQueue.postEvent() may be overridden by client
2047 * code, and we mustn't ever call client code from the toolkit thread.
2048 */
2049 class PostEventQueue {
2050 private EventQueueItem queueHead = null;
2051 private EventQueueItem queueTail = null;
2052 private final EventQueue eventQueue;
2053
2054 private Thread flushThread = null;
2055
2056 PostEventQueue(EventQueue eq) {
2057 eventQueue = eq;
2058 }
2059
2060 /*
2061 * Continually post pending AWTEvents to the Java EventQueue. The method
2062 * is synchronized to ensure the flush is completed before a new event
2063 * can be posted to this queue.
2064 *
2065 * 7177040: The method couldn't be wholly synchronized because of calls
2066 * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2067 * potentially lead to deadlock
2068 */
2069 public void flush() {
2070
2071 Thread newThread = Thread.currentThread();
2072
2073 try {
2074 EventQueueItem tempQueue;
2075 synchronized (this) {
2076 // Avoid method recursion
2077 if (newThread == flushThread) {
2078 return;
2079 }
2080 // Wait for other threads' flushing
2081 while (flushThread != null) {
2082 wait();
2083 }
2084 // Skip everything if queue is empty
2085 if (queueHead == null) {
2086 return;
2087 }
2088 // Remember flushing thread
2089 flushThread = newThread;
2090
2091 tempQueue = queueHead;
2092 queueHead = queueTail = null;
2093 }
2094 try {
2095 while (tempQueue != null) {
2096 eventQueue.postEvent(tempQueue.event);
2097 tempQueue = tempQueue.next;
2098 }
2099 }
2100 finally {
2101 // Only the flushing thread can get here
2102 synchronized (this) {
2103 // Forget flushing thread, inform other pending threads
2104 flushThread = null;
2105 notifyAll();
2106 }
2107 }
2108 }
2109 catch (InterruptedException e) {
2110 // Couldn't allow exception go up, so at least recover the flag
2111 newThread.interrupt();
2112 }
2113 }
2114
2115 /*
2116 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2117 */
2118 void postEvent(AWTEvent event) {
2119 EventQueueItem item = new EventQueueItem(event);
2120
2121 synchronized (this) {
2122 if (queueHead == null) {
2123 queueHead = queueTail = item;
2124 } else {
2125 queueTail.next = item;
2126 queueTail = item;
2127 }
2128 }
2129 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2130 }
2131 } // class PostEventQueue