1 /*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package sun.awt;
27
28 import java.awt.*;
29 import static java.awt.RenderingHints.*;
30 import java.awt.dnd.*;
31 import java.awt.dnd.peer.DragSourceContextPeer;
32 import java.awt.peer.*;
33 import java.awt.event.WindowEvent;
34 import java.awt.event.KeyEvent;
35 import java.awt.image.*;
36 import java.awt.TrayIcon;
37 import java.awt.SystemTray;
38 import java.awt.event.InputEvent;
39 import java.net.URL;
40 import java.util.*;
41 import java.util.concurrent.TimeUnit;
42 import java.util.concurrent.locks.Condition;
43 import java.util.concurrent.locks.Lock;
44 import java.util.concurrent.locks.ReentrantLock;
45
46 import sun.security.util.SecurityConstants;
47 import sun.util.logging.PlatformLogger;
48 import sun.misc.SoftCache;
49 import sun.font.FontDesignMetrics;
50 import sun.awt.im.InputContext;
51 import sun.awt.image.*;
52 import sun.security.action.GetPropertyAction;
53 import sun.security.action.GetBooleanAction;
54 import java.lang.reflect.InvocationTargetException;
55 import java.security.AccessController;
56
57 public abstract class SunToolkit extends Toolkit
58 implements WindowClosingSupport, WindowClosingListener,
59 ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
60
61 private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.SunToolkit");
62
63 /* Load debug settings for native code */
64 static {
65 if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
66 DebugSettings.init();
67 }
68 };
69
70 /**
71 * Special mask for the UngrabEvent events, in addition to the
72 * public masks defined in AWTEvent. Should be used as the mask
73 * value for Toolkit.addAWTEventListener.
74 */
75 public static final int GRAB_EVENT_MASK = 0x80000000;
76
77 /* The key to put()/get() the PostEventQueue into/from the AppContext.
78 */
79 private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
80
81 /**
82 * Number of buttons.
83 * By default it's taken from the system. If system value does not
84 * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
85 */
86 protected static int numberOfButtons = 0;
87
88
89 /* XFree standard mention 24 buttons as maximum:
90 * http://www.xfree86.org/current/mouse.4.html
91 * We workaround systems supporting more than 24 buttons.
92 * Otherwise, we have to use long type values as masks
93 * which leads to API change.
94 * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
95 * the 4-bytes limit for the int type. (CR 6799099)
96 * One more bit is reserved for FIRST_HIGH_BIT.
97 */
98 public final static int MAX_BUTTONS_SUPPORTED = 20;
99
100 private static void initEQ(AppContext appContext) {
101 EventQueue eventQueue;
102
103 String eqName = System.getProperty("AWT.EventQueueClass",
104 "java.awt.EventQueue");
105
106 try {
107 eventQueue = (EventQueue)Class.forName(eqName).newInstance();
108 } catch (Exception e) {
109 e.printStackTrace();
110 System.err.println("Failed loading " + eqName + ": " + e);
111 eventQueue = new EventQueue();
112 }
113 appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
114
115 PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
116 appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
117 }
118
119 public SunToolkit() {
120 // 7122796: Always create an EQ for the main AppContext
121 initEQ(AppContext.getMainAppContext());
122 }
123
124 public boolean useBufferPerWindow() {
125 return false;
126 }
127
128 public abstract WindowPeer createWindow(Window target)
129 throws HeadlessException;
130
131 public abstract FramePeer createFrame(Frame target)
132 throws HeadlessException;
133
134 public abstract DialogPeer createDialog(Dialog target)
135 throws HeadlessException;
136
137 public abstract ButtonPeer createButton(Button target)
138 throws HeadlessException;
139
140 public abstract TextFieldPeer createTextField(TextField target)
141 throws HeadlessException;
142
143 public abstract ChoicePeer createChoice(Choice target)
144 throws HeadlessException;
145
146 public abstract LabelPeer createLabel(Label target)
147 throws HeadlessException;
148
149 public abstract ListPeer createList(java.awt.List target)
150 throws HeadlessException;
151
152 public abstract CheckboxPeer createCheckbox(Checkbox target)
153 throws HeadlessException;
154
155 public abstract ScrollbarPeer createScrollbar(Scrollbar target)
156 throws HeadlessException;
157
158 public abstract ScrollPanePeer createScrollPane(ScrollPane target)
159 throws HeadlessException;
160
161 public abstract TextAreaPeer createTextArea(TextArea target)
162 throws HeadlessException;
163
164 public abstract FileDialogPeer createFileDialog(FileDialog target)
165 throws HeadlessException;
166
167 public abstract MenuBarPeer createMenuBar(MenuBar target)
168 throws HeadlessException;
169
170 public abstract MenuPeer createMenu(Menu target)
171 throws HeadlessException;
172
173 public abstract PopupMenuPeer createPopupMenu(PopupMenu target)
174 throws HeadlessException;
175
176 public abstract MenuItemPeer createMenuItem(MenuItem target)
177 throws HeadlessException;
178
179 public abstract CheckboxMenuItemPeer createCheckboxMenuItem(
180 CheckboxMenuItem target)
181 throws HeadlessException;
182
183 public abstract DragSourceContextPeer createDragSourceContextPeer(
184 DragGestureEvent dge)
185 throws InvalidDnDOperationException;
186
187 public abstract TrayIconPeer createTrayIcon(TrayIcon target)
188 throws HeadlessException, AWTException;
189
190 public abstract SystemTrayPeer createSystemTray(SystemTray target);
191
192 public abstract boolean isTraySupported();
193
194 public abstract FontPeer getFontPeer(String name, int style);
195
196 public abstract RobotPeer createRobot(Robot target, GraphicsDevice screen)
197 throws AWTException;
198
199 public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
200 throws HeadlessException;
201
202 /**
203 * The AWT lock is typically only used on Unix platforms to synchronize
204 * access to Xlib, OpenGL, etc. However, these methods are implemented
205 * in SunToolkit so that they can be called from shared code (e.g.
206 * from the OGL pipeline) or from the X11 pipeline regardless of whether
207 * XToolkit or MToolkit is currently in use. There are native macros
208 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
209 * methods is changed, make sure it is compatible with the native macros.
210 *
211 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
212 * used in place of:
213 * synchronized (getAWTLock()) {
214 * ...
215 * }
216 *
217 * By factoring these methods out specially, we are able to change the
218 * implementation of these methods (e.g. use more advanced locking
219 * mechanisms) without impacting calling code.
220 *
221 * Sample usage:
222 * private void doStuffWithXlib() {
223 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
224 * SunToolkit.awtLock();
225 * try {
226 * ...
227 * XlibWrapper.XDoStuff();
228 * } finally {
229 * SunToolkit.awtUnlock();
230 * }
231 * }
232 */
233
234 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
235 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
236
237 public static final void awtLock() {
238 AWT_LOCK.lock();
239 }
240
241 public static final boolean awtTryLock() {
242 return AWT_LOCK.tryLock();
243 }
244
245 public static final void awtUnlock() {
246 AWT_LOCK.unlock();
247 }
248
249 public static final void awtLockWait()
250 throws InterruptedException
251 {
252 AWT_LOCK_COND.await();
253 }
254
255 public static final void awtLockWait(long timeout)
256 throws InterruptedException
257 {
258 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
259 }
260
261 public static final void awtLockNotify() {
262 AWT_LOCK_COND.signal();
263 }
264
265 public static final void awtLockNotifyAll() {
266 AWT_LOCK_COND.signalAll();
267 }
268
269 public static final boolean isAWTLockHeldByCurrentThread() {
270 return AWT_LOCK.isHeldByCurrentThread();
271 }
272
273 /*
274 * Create a new AppContext, along with its EventQueue, for a
275 * new ThreadGroup. Browser code, for example, would use this
276 * method to create an AppContext & EventQueue for an Applet.
277 */
278 public static AppContext createNewAppContext() {
279 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
280 // Create appContext before initialization of EventQueue, so all
281 // the calls to AppContext.getAppContext() from EventQueue ctor
282 // return correct values
283 AppContext appContext = new AppContext(threadGroup);
284
285 initEQ(appContext);
286
287 return appContext;
288 }
289
290 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
291 AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
292 }
293
294 /*
295 * Fetch the peer associated with the given target (as specified
296 * in the peer creation method). This can be used to determine
297 * things like what the parent peer is. If the target is null
298 * or the target can't be found (either because the a peer was
299 * never created for it or the peer was disposed), a null will
300 * be returned.
301 */
302 protected static Object targetToPeer(Object target) {
303 if (target != null && !GraphicsEnvironment.isHeadless()) {
304 return AWTAutoShutdown.getInstance().getPeer(target);
305 }
306 return null;
307 }
308
309 protected static void targetCreatedPeer(Object target, Object peer) {
310 if (target != null && peer != null &&
311 !GraphicsEnvironment.isHeadless())
312 {
313 AWTAutoShutdown.getInstance().registerPeer(target, peer);
314 }
315 }
316
317 protected static void targetDisposedPeer(Object target, Object peer) {
318 if (target != null && peer != null &&
319 !GraphicsEnvironment.isHeadless())
320 {
321 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
322 }
323 }
324
325 // Maps from non-Component/MenuComponent to AppContext.
326 // WeakHashMap<Component,AppContext>
327 private static final Map appContextMap =
328 Collections.synchronizedMap(new WeakHashMap());
329
330 /**
331 * Sets the appContext field of target. If target is not a Component or
332 * MenuComponent, this returns false.
333 */
334 private static boolean setAppContext(Object target,
335 AppContext context) {
336 if (target instanceof Component) {
337 AWTAccessor.getComponentAccessor().
338 setAppContext((Component)target, context);
339 } else if (target instanceof MenuComponent) {
340 AWTAccessor.getMenuComponentAccessor().
341 setAppContext((MenuComponent)target, context);
342 } else {
343 return false;
344 }
345 return true;
346 }
347
348 /**
349 * Returns the appContext field for target. If target is not a
350 * Component or MenuComponent this returns null.
351 */
352 private static AppContext getAppContext(Object target) {
353 if (target instanceof Component) {
354 return AWTAccessor.getComponentAccessor().
355 getAppContext((Component)target);
356 } else if (target instanceof MenuComponent) {
357 return AWTAccessor.getMenuComponentAccessor().
358 getAppContext((MenuComponent)target);
359 } else {
360 return null;
361 }
362 }
363
364 /*
365 * Fetch the AppContext associated with the given target.
366 * This can be used to determine things like which EventQueue
367 * to use for posting events to a Component. If the target is
368 * null or the target can't be found, a null with be returned.
369 */
370 public static AppContext targetToAppContext(Object target) {
371 if (target == null || GraphicsEnvironment.isHeadless()) {
372 return null;
373 }
374 AppContext context = getAppContext(target);
375 if (context == null) {
376 // target is not a Component/MenuComponent, try the
377 // appContextMap.
378 context = (AppContext)appContextMap.get(target);
379 }
380 return context;
381 }
382
383 /**
384 * Sets the synchronous status of focus requests on lightweight
385 * components in the specified window to the specified value.
386 * If the boolean parameter is <code>true</code> then the focus
387 * requests on lightweight components will be performed
388 * synchronously, if it is <code>false</code>, then asynchronously.
389 * By default, all windows have their lightweight request status
390 * set to asynchronous.
391 * <p>
392 * The application can only set the status of lightweight focus
393 * requests to synchronous for any of its windows if it doesn't
394 * perform focus transfers between different heavyweight containers.
395 * In this case the observable focus behaviour is the same as with
396 * asynchronous status.
397 * <p>
398 * If the application performs focus transfer between different
399 * heavyweight containers and sets the lightweight focus request
400 * status to synchronous for any of its windows, then further focus
401 * behaviour is unspecified.
402 * <p>
403 * @param w window for which the lightweight focus request status
404 * should be set
405 * @param status the value of lightweight focus request status
406 */
407
408 public static void setLWRequestStatus(Window changed,boolean status){
409 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
410 };
411
412 public static void checkAndSetPolicy(Container cont) {
413 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
414 getCurrentKeyboardFocusManager().
415 getDefaultFocusTraversalPolicy();
416
417 cont.setFocusTraversalPolicy(defaultPolicy);
418 }
419
420 private static FocusTraversalPolicy createLayoutPolicy() {
421 FocusTraversalPolicy policy = null;
422 try {
423 Class layoutPolicyClass =
424 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
425 policy = (FocusTraversalPolicy) layoutPolicyClass.newInstance();
426 }
427 catch (ClassNotFoundException e) {
428 assert false;
429 }
430 catch (InstantiationException e) {
431 assert false;
432 }
433 catch (IllegalAccessException e) {
434 assert false;
435 }
436
437 return policy;
438 }
439
440 /*
441 * Insert a mapping from target to AppContext, for later retrieval
442 * via targetToAppContext() above.
443 */
444 public static void insertTargetMapping(Object target, AppContext appContext) {
445 if (!GraphicsEnvironment.isHeadless()) {
446 if (!setAppContext(target, appContext)) {
447 // Target is not a Component/MenuComponent, use the private Map
448 // instead.
449 appContextMap.put(target, appContext);
450 }
451 }
452 }
453
454 /*
455 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
456 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
457 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
458 * not be called under another lock since it locks the EventQueue.
459 * See bugids 4632918, 4526597.
460 */
461 public static void postEvent(AppContext appContext, AWTEvent event) {
462 if (event == null) {
463 throw new NullPointerException();
464 }
465
466 AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
467 if (sea != null && sea.isSequencedEvent(event)) {
468 AWTEvent nested = sea.getNested(event);
469 if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
470 nested instanceof TimedWindowEvent)
471 {
472 TimedWindowEvent twe = (TimedWindowEvent)nested;
473 ((SunToolkit)Toolkit.getDefaultToolkit()).
474 setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
475 }
476 }
477
478 // All events posted via this method are system-generated.
479 // Placing the following call here reduces considerably the
480 // number of places throughout the toolkit that would
481 // otherwise have to be modified to precisely identify
482 // system-generated events.
483 setSystemGenerated(event);
484 AppContext eventContext = targetToAppContext(event.getSource());
485 if (eventContext != null && !eventContext.equals(appContext)) {
486 log.fine("Event posted on wrong app context : " + event);
487 }
488 PostEventQueue postEventQueue =
489 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
490 if (postEventQueue != null) {
491 postEventQueue.postEvent(event);
492 }
493 }
494
495 /*
496 * Post AWTEvent of high priority.
497 */
498 public static void postPriorityEvent(final AWTEvent e) {
499 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
500 public void run() {
501 AWTAccessor.getAWTEventAccessor().setPosted(e);
502 ((Component)e.getSource()).dispatchEvent(e);
503 }
504 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
505 postEvent(targetToAppContext(e.getSource()), pe);
506 }
507
508 protected static final Lock flushLock = new ReentrantLock();
509 private static boolean isFlushingPendingEvents = false;
510
511 /*
512 * Flush any pending events which haven't been posted to the AWT
513 * EventQueue yet.
514 */
515 public static void flushPendingEvents() {
516 flushLock.lock();
517 try {
518 // Don't call flushPendingEvents() recursively
519 if (!isFlushingPendingEvents) {
520 isFlushingPendingEvents = true;
521 try {
522 AppContext appContext = AppContext.getAppContext();
523 PostEventQueue postEventQueue =
524 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
525 if (postEventQueue != null) {
526 postEventQueue.flush();
527 }
528 }
529 finally {
530 isFlushingPendingEvents = false;
531 }
532 }
533 } finally {
534 flushLock.unlock();
535 }
536 }
537
538 public static boolean isPostEventQueueEmpty() {
539 AppContext appContext = AppContext.getAppContext();
540 PostEventQueue postEventQueue =
541 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
542 if (postEventQueue != null) {
543 return postEventQueue.noEvents();
544 } else {
545 return true;
546 }
547 }
548
549 /*
550 * Execute a chunk of code on the Java event handler thread for the
551 * given target. Does not wait for the execution to occur before
552 * returning to the caller.
553 */
554 public static void executeOnEventHandlerThread(Object target,
555 Runnable runnable) {
556 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
557 }
558
559 /*
560 * Fixed 5064013: the InvocationEvent time should be equals
561 * the time of the ActionEvent
562 */
563 public static void executeOnEventHandlerThread(Object target,
564 Runnable runnable,
565 final long when) {
566 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT){
567 public long getWhen(){
568 return when;
569 }
570 });
571 }
572
573 /*
574 * Execute a chunk of code on the Java event handler thread for the
575 * given target. Does not wait for the execution to occur before
576 * returning to the caller.
577 */
578 public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
579 postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
580 }
581
582 /*
583 * Execute a chunk of code on the Java event handler thread. The
584 * method takes into account provided AppContext and sets
585 * <code>SunToolkit.getDefaultToolkit()</code> as a target of the
586 * event. See 6451487 for detailes.
587 * Does not wait for the execution to occur before returning to
588 * the caller.
589 */
590 public static void invokeLaterOnAppContext(
591 AppContext appContext, Runnable dispatcher)
592 {
593 postEvent(appContext,
594 new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
595 PeerEvent.PRIORITY_EVENT));
596 }
597
598 /*
599 * Execute a chunk of code on the Java event handler thread for the
600 * given target. Waits for the execution to occur before returning
601 * to the caller.
602 */
603 public static void executeOnEDTAndWait(Object target, Runnable runnable)
604 throws InterruptedException, InvocationTargetException
605 {
606 if (EventQueue.isDispatchThread()) {
607 throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
608 }
609
610 class AWTInvocationLock {}
611 Object lock = new AWTInvocationLock();
612
613 PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
614
615 synchronized (lock) {
616 executeOnEventHandlerThread(event);
617 while(!event.isDispatched()) {
618 lock.wait();
619 }
620 }
621
622 Throwable eventThrowable = event.getThrowable();
623 if (eventThrowable != null) {
624 throw new InvocationTargetException(eventThrowable);
625 }
626 }
627
628 /*
629 * Returns true if the calling thread is the event dispatch thread
630 * contained within AppContext which associated with the given target.
631 * Use this call to ensure that a given task is being executed
632 * (or not being) on the event dispatch thread for the given target.
633 */
634 public static boolean isDispatchThreadForAppContext(Object target) {
635 AppContext appContext = targetToAppContext(target);
636 EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
637
638 AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
639 return accessor.isDispatchThreadImpl(eq);
640 }
641
642 public Dimension getScreenSize() {
643 return new Dimension(getScreenWidth(), getScreenHeight());
644 }
645 protected abstract int getScreenWidth();
646 protected abstract int getScreenHeight();
647
648 public FontMetrics getFontMetrics(Font font) {
649 return FontDesignMetrics.getMetrics(font);
650 }
651
652 public String[] getFontList() {
653 String[] hardwiredFontList = {
654 Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
655 Font.DIALOG_INPUT
656
657 // -- Obsolete font names from 1.0.2. It was decided that
658 // -- getFontList should not return these old names:
659 // "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
660 };
661 return hardwiredFontList;
662 }
663
664 public PanelPeer createPanel(Panel target) {
665 return (PanelPeer)createComponent(target);
666 }
667
668 public CanvasPeer createCanvas(Canvas target) {
669 return (CanvasPeer)createComponent(target);
670 }
671
672 /**
673 * Disables erasing of background on the canvas before painting if
674 * this is supported by the current toolkit. It is recommended to
675 * call this method early, before the Canvas becomes displayable,
676 * because some Toolkit implementations do not support changing
677 * this property once the Canvas becomes displayable.
678 */
679 public void disableBackgroundErase(Canvas canvas) {
680 disableBackgroundEraseImpl(canvas);
681 }
682
683 /**
684 * Disables the native erasing of the background on the given
685 * component before painting if this is supported by the current
686 * toolkit. This only has an effect for certain components such as
687 * Canvas, Panel and Window. It is recommended to call this method
688 * early, before the Component becomes displayable, because some
689 * Toolkit implementations do not support changing this property
690 * once the Component becomes displayable.
691 */
692 public void disableBackgroundErase(Component component) {
693 disableBackgroundEraseImpl(component);
694 }
695
696 private void disableBackgroundEraseImpl(Component component) {
697 AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
698 }
699
700 /**
701 * Returns the value of "sun.awt.noerasebackground" property. Default
702 * value is {@code false}.
703 */
704 public static boolean getSunAwtNoerasebackground() {
705 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
706 }
707
708 /**
709 * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
710 * value is {@code false}.
711 */
712 public static boolean getSunAwtErasebackgroundonresize() {
713 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
714 }
715
716
717 static final SoftCache imgCache = new SoftCache();
718
719 static Image getImageFromHash(Toolkit tk, URL url) {
720 SecurityManager sm = System.getSecurityManager();
721 if (sm != null) {
722 try {
723 java.security.Permission perm =
724 url.openConnection().getPermission();
725 if (perm != null) {
726 try {
727 sm.checkPermission(perm);
728 } catch (SecurityException se) {
729 // fallback to checkRead/checkConnect for pre 1.2
730 // security managers
731 if ((perm instanceof java.io.FilePermission) &&
732 perm.getActions().indexOf("read") != -1) {
733 sm.checkRead(perm.getName());
734 } else if ((perm instanceof
735 java.net.SocketPermission) &&
736 perm.getActions().indexOf("connect") != -1) {
737 sm.checkConnect(url.getHost(), url.getPort());
738 } else {
739 throw se;
740 }
741 }
742 }
743 } catch (java.io.IOException ioe) {
744 sm.checkConnect(url.getHost(), url.getPort());
745 }
746 }
747 synchronized (imgCache) {
748 Image img = (Image)imgCache.get(url);
749 if (img == null) {
750 try {
751 img = tk.createImage(new URLImageSource(url));
752 imgCache.put(url, img);
753 } catch (Exception e) {
754 }
755 }
756 return img;
757 }
758 }
759
760 static Image getImageFromHash(Toolkit tk,
761 String filename) {
762 SecurityManager security = System.getSecurityManager();
763 if (security != null) {
764 security.checkRead(filename);
765 }
766 synchronized (imgCache) {
767 Image img = (Image)imgCache.get(filename);
768 if (img == null) {
769 try {
770 img = tk.createImage(new FileImageSource(filename));
771 imgCache.put(filename, img);
772 } catch (Exception e) {
773 }
774 }
775 return img;
776 }
777 }
778
779 public Image getImage(String filename) {
780 return getImageFromHash(this, filename);
781 }
782
783 public Image getImage(URL url) {
784 return getImageFromHash(this, url);
785 }
786
787 public Image createImage(String filename) {
788 SecurityManager security = System.getSecurityManager();
789 if (security != null) {
790 security.checkRead(filename);
791 }
792 return createImage(new FileImageSource(filename));
793 }
794
795 public Image createImage(URL url) {
796 SecurityManager sm = System.getSecurityManager();
797 if (sm != null) {
798 try {
799 java.security.Permission perm =
800 url.openConnection().getPermission();
801 if (perm != null) {
802 try {
803 sm.checkPermission(perm);
804 } catch (SecurityException se) {
805 // fallback to checkRead/checkConnect for pre 1.2
806 // security managers
807 if ((perm instanceof java.io.FilePermission) &&
808 perm.getActions().indexOf("read") != -1) {
809 sm.checkRead(perm.getName());
810 } else if ((perm instanceof
811 java.net.SocketPermission) &&
812 perm.getActions().indexOf("connect") != -1) {
813 sm.checkConnect(url.getHost(), url.getPort());
814 } else {
815 throw se;
816 }
817 }
818 }
819 } catch (java.io.IOException ioe) {
820 sm.checkConnect(url.getHost(), url.getPort());
821 }
822 }
823 return createImage(new URLImageSource(url));
824 }
825
826 public Image createImage(byte[] data, int offset, int length) {
827 return createImage(new ByteArrayImageSource(data, offset, length));
828 }
829
830 public Image createImage(ImageProducer producer) {
831 return new ToolkitImage(producer);
832 }
833
834 public int checkImage(Image img, int w, int h, ImageObserver o) {
835 if (!(img instanceof ToolkitImage)) {
836 return ImageObserver.ALLBITS;
837 }
838
839 ToolkitImage tkimg = (ToolkitImage)img;
840 int repbits;
841 if (w == 0 || h == 0) {
842 repbits = ImageObserver.ALLBITS;
843 } else {
844 repbits = tkimg.getImageRep().check(o);
845 }
846 return tkimg.check(o) | repbits;
847 }
848
849 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
850 if (w == 0 || h == 0) {
851 return true;
852 }
853
854 // Must be a ToolkitImage
855 if (!(img instanceof ToolkitImage)) {
856 return true;
857 }
858
859 ToolkitImage tkimg = (ToolkitImage)img;
860 if (tkimg.hasError()) {
861 if (o != null) {
862 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
863 -1, -1, -1, -1);
864 }
865 return false;
866 }
867 ImageRepresentation ir = tkimg.getImageRep();
868 return ir.prepare(o);
869 }
870
871 /**
872 * Scans {@code imageList} for best-looking image of specified dimensions.
873 * Image can be scaled and/or padded with transparency.
874 */
875 public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
876 if (width == 0 || height == 0) {
877 return null;
878 }
879 Image bestImage = null;
880 int bestWidth = 0;
881 int bestHeight = 0;
882 double bestSimilarity = 3; //Impossibly high value
883 double bestScaleFactor = 0;
884 for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
885 //Iterate imageList looking for best matching image.
886 //'Similarity' measure is defined as good scale factor and small insets.
887 //best possible similarity is 0 (no scale, no insets).
888 //It's found while the experiments that good-looking result is achieved
889 //with scale factors x1, x3/4, x2/3, xN, x1/N.
890 Image im = i.next();
891 if (im == null) {
892 if (log.isLoggable(PlatformLogger.FINER)) {
893 log.finer("SunToolkit.getScaledIconImage: " +
894 "Skipping the image passed into Java because it's null.");
895 }
896 continue;
897 }
898 if (im instanceof ToolkitImage) {
899 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
900 ir.reconstruct(ImageObserver.ALLBITS);
901 }
902 int iw;
903 int ih;
904 try {
905 iw = im.getWidth(null);
906 ih = im.getHeight(null);
907 } catch (Exception e){
908 if (log.isLoggable(PlatformLogger.FINER)) {
909 log.finer("SunToolkit.getScaledIconImage: " +
910 "Perhaps the image passed into Java is broken. Skipping this icon.");
911 }
912 continue;
913 }
914 if (iw > 0 && ih > 0) {
915 //Calc scale factor
916 double scaleFactor = Math.min((double)width / (double)iw,
917 (double)height / (double)ih);
918 //Calculate scaled image dimensions
919 //adjusting scale factor to nearest "good" value
920 int adjw = 0;
921 int adjh = 0;
922 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
923 if (scaleFactor >= 2) {
924 //Need to enlarge image more than twice
925 //Round down scale factor to multiply by integer value
926 scaleFactor = Math.floor(scaleFactor);
927 adjw = iw * (int)scaleFactor;
928 adjh = ih * (int)scaleFactor;
929 scaleMeasure = 1.0 - 0.5 / scaleFactor;
930 } else if (scaleFactor >= 1) {
931 //Don't scale
932 scaleFactor = 1.0;
933 adjw = iw;
934 adjh = ih;
935 scaleMeasure = 0;
936 } else if (scaleFactor >= 0.75) {
937 //Multiply by 3/4
938 scaleFactor = 0.75;
939 adjw = iw * 3 / 4;
940 adjh = ih * 3 / 4;
941 scaleMeasure = 0.3;
942 } else if (scaleFactor >= 0.6666) {
943 //Multiply by 2/3
944 scaleFactor = 0.6666;
945 adjw = iw * 2 / 3;
946 adjh = ih * 2 / 3;
947 scaleMeasure = 0.33;
948 } else {
949 //Multiply size by 1/scaleDivider
950 //where scaleDivider is minimum possible integer
951 //larger than 1/scaleFactor
952 double scaleDivider = Math.ceil(1.0 / scaleFactor);
953 scaleFactor = 1.0 / scaleDivider;
954 adjw = (int)Math.round((double)iw / scaleDivider);
955 adjh = (int)Math.round((double)ih / scaleDivider);
956 scaleMeasure = 1.0 - 1.0 / scaleDivider;
957 }
958 double similarity = ((double)width - (double)adjw) / (double)width +
959 ((double)height - (double)adjh) / (double)height + //Large padding is bad
960 scaleMeasure; //Large rescale is bad
961 if (similarity < bestSimilarity) {
962 bestSimilarity = similarity;
963 bestScaleFactor = scaleFactor;
964 bestImage = im;
965 bestWidth = adjw;
966 bestHeight = adjh;
967 }
968 if (similarity == 0) break;
969 }
970 }
971 if (bestImage == null) {
972 //No images were found, possibly all are broken
973 return null;
974 }
975 BufferedImage bimage =
976 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
977 Graphics2D g = bimage.createGraphics();
978 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
979 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
980 try {
981 int x = (width - bestWidth) / 2;
982 int y = (height - bestHeight) / 2;
983 if (log.isLoggable(PlatformLogger.FINER)) {
984 log.finer("WWindowPeer.getScaledIconData() result : " +
985 "w : " + width + " h : " + height +
986 " iW : " + bestImage.getWidth(null) + " iH : " + bestImage.getHeight(null) +
987 " sim : " + bestSimilarity + " sf : " + bestScaleFactor +
988 " adjW : " + bestWidth + " adjH : " + bestHeight +
989 " x : " + x + " y : " + y);
990 }
991 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
992 } finally {
993 g.dispose();
994 }
995 return bimage;
996 }
997
998 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
999 BufferedImage bimage = getScaledIconImage(imageList, width, height);
1000 if (bimage == null) {
1001 if (log.isLoggable(PlatformLogger.FINER)) {
1002 log.finer("SunToolkit.getScaledIconData: " +
1003 "Perhaps the image passed into Java is broken. Skipping this icon.");
1004 }
1005 return null;
1006 }
1007 Raster raster = bimage.getRaster();
1008 DataBuffer buffer = raster.getDataBuffer();
1009 return (DataBufferInt)buffer;
1010 }
1011
1012 protected EventQueue getSystemEventQueueImpl() {
1013 return getSystemEventQueueImplPP();
1014 }
1015
1016 // Package private implementation
1017 static EventQueue getSystemEventQueueImplPP() {
1018 return getSystemEventQueueImplPP(AppContext.getAppContext());
1019 }
1020
1021 public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1022 EventQueue theEventQueue =
1023 (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1024 return theEventQueue;
1025 }
1026
1027 /**
1028 * Give native peers the ability to query the native container
1029 * given a native component (eg the direct parent may be lightweight).
1030 */
1031 public static Container getNativeContainer(Component c) {
1032 return Toolkit.getNativeContainer(c);
1033 }
1034
1035 /**
1036 * Gives native peers the ability to query the closest HW component.
1037 * If the given component is heavyweight, then it returns this. Otherwise,
1038 * it goes one level up in the hierarchy and tests next component.
1039 */
1040 public static Component getHeavyweightComponent(Component c) {
1041 while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1042 c = AWTAccessor.getComponentAccessor().getParent(c);
1043 }
1044 return c;
1045 }
1046
1047 /**
1048 * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1049 */
1050 public int getFocusAcceleratorKeyMask() {
1051 return InputEvent.ALT_MASK;
1052 }
1053
1054 /**
1055 * Tests whether specified key modifiers mask can be used to enter a printable
1056 * character. This is a default implementation of this method, which reflects
1057 * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1058 * characters from the extended character set (like euro sign or math symbols)
1059 */
1060 public boolean isPrintableCharacterModifiersMask(int mods) {
1061 return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1062 }
1063
1064 /**
1065 * Returns whether popup is allowed to be shown above the task bar.
1066 * This is a default implementation of this method, which checks
1067 * corresponding security permission.
1068 */
1069 public boolean canPopupOverlapTaskBar() {
1070 boolean result = true;
1071 try {
1072 SecurityManager sm = System.getSecurityManager();
1073 if (sm != null) {
1074 sm.checkPermission(
1075 SecurityConstants.AWT.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1076 }
1077 } catch (SecurityException se) {
1078 // There is no permission to show popups over the task bar
1079 result = false;
1080 }
1081 return result;
1082 }
1083
1084 /**
1085 * Returns a new input method window, with behavior as specified in
1086 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1087 * If the inputContext is not null, the window should return it from its
1088 * getInputContext() method. The window needs to implement
1089 * sun.awt.im.InputMethodWindow.
1090 * <p>
1091 * SunToolkit subclasses can override this method to return better input
1092 * method windows.
1093 */
1094 public Window createInputMethodWindow(String title, InputContext context) {
1095 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1096 }
1097
1098 /**
1099 * Returns whether enableInputMethods should be set to true for peered
1100 * TextComponent instances on this platform. False by default.
1101 */
1102 public boolean enableInputMethodsForTextComponent() {
1103 return false;
1104 }
1105
1106 private static Locale startupLocale = null;
1107
1108 /**
1109 * Returns the locale in which the runtime was started.
1110 */
1111 public static Locale getStartupLocale() {
1112 if (startupLocale == null) {
1113 String language, region, country, variant;
1114 language = (String) AccessController.doPrivileged(
1115 new GetPropertyAction("user.language", "en"));
1116 // for compatibility, check for old user.region property
1117 region = (String) AccessController.doPrivileged(
1118 new GetPropertyAction("user.region"));
1119 if (region != null) {
1120 // region can be of form country, country_variant, or _variant
1121 int i = region.indexOf('_');
1122 if (i >= 0) {
1123 country = region.substring(0, i);
1124 variant = region.substring(i + 1);
1125 } else {
1126 country = region;
1127 variant = "";
1128 }
1129 } else {
1130 country = (String) AccessController.doPrivileged(
1131 new GetPropertyAction("user.country", ""));
1132 variant = (String) AccessController.doPrivileged(
1133 new GetPropertyAction("user.variant", ""));
1134 }
1135 startupLocale = new Locale(language, country, variant);
1136 }
1137 return startupLocale;
1138 }
1139
1140 /**
1141 * Returns the default keyboard locale of the underlying operating system
1142 */
1143 public Locale getDefaultKeyboardLocale() {
1144 return getStartupLocale();
1145 }
1146
1147 private static String dataTransfererClassName = null;
1148
1149 protected static void setDataTransfererClassName(String className) {
1150 dataTransfererClassName = className;
1151 }
1152
1153 public static String getDataTransfererClassName() {
1154 if (dataTransfererClassName == null) {
1155 Toolkit.getDefaultToolkit(); // transferer set during toolkit init
1156 }
1157 return dataTransfererClassName;
1158 }
1159
1160 // Support for window closing event notifications
1161 private transient WindowClosingListener windowClosingListener = null;
1162 /**
1163 * @see sun.awt.WindowClosingSupport#getWindowClosingListener
1164 */
1165 public WindowClosingListener getWindowClosingListener() {
1166 return windowClosingListener;
1167 }
1168 /**
1169 * @see sun.awt.WindowClosingSupport#setWindowClosingListener
1170 */
1171 public void setWindowClosingListener(WindowClosingListener wcl) {
1172 windowClosingListener = wcl;
1173 }
1174
1175 /**
1176 * @see sun.awt.WindowClosingListener#windowClosingNotify
1177 */
1178 public RuntimeException windowClosingNotify(WindowEvent event) {
1179 if (windowClosingListener != null) {
1180 return windowClosingListener.windowClosingNotify(event);
1181 } else {
1182 return null;
1183 }
1184 }
1185 /**
1186 * @see sun.awt.WindowClosingListener#windowClosingDelivered
1187 */
1188 public RuntimeException windowClosingDelivered(WindowEvent event) {
1189 if (windowClosingListener != null) {
1190 return windowClosingListener.windowClosingDelivered(event);
1191 } else {
1192 return null;
1193 }
1194 }
1195
1196 private static DefaultMouseInfoPeer mPeer = null;
1197
1198 protected synchronized MouseInfoPeer getMouseInfoPeer() {
1199 if (mPeer == null) {
1200 mPeer = new DefaultMouseInfoPeer();
1201 }
1202 return mPeer;
1203 }
1204
1205
1206 /**
1207 * Returns whether default toolkit needs the support of the xembed
1208 * from embedding host(if any).
1209 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1210 */
1211 public static boolean needsXEmbed() {
1212 String noxembed = (String) AccessController.
1213 doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1214 if ("true".equals(noxembed)) {
1215 return false;
1216 }
1217
1218 Toolkit tk = Toolkit.getDefaultToolkit();
1219 if (tk instanceof SunToolkit) {
1220 // SunToolkit descendants should override this method to specify
1221 // concrete behavior
1222 return ((SunToolkit)tk).needsXEmbedImpl();
1223 } else {
1224 // Non-SunToolkit doubtly might support XEmbed
1225 return false;
1226 }
1227 }
1228
1229 /**
1230 * Returns whether this toolkit needs the support of the xembed
1231 * from embedding host(if any).
1232 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1233 */
1234 protected boolean needsXEmbedImpl() {
1235 return false;
1236 }
1237
1238 private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1239
1240 /**
1241 * Returns whether the XEmbed server feature is requested by
1242 * developer. If true, Toolkit should return an
1243 * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1244 */
1245 protected final boolean isXEmbedServerRequested() {
1246 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1247 }
1248
1249 /**
1250 * Returns whether the modal exclusion API is supported by the current toolkit.
1251 * When it isn't supported, calling <code>setModalExcluded</code> has no
1252 * effect, and <code>isModalExcluded</code> returns false for all windows.
1253 *
1254 * @return true if modal exclusion is supported by the toolkit, false otherwise
1255 *
1256 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1257 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1258 *
1259 * @since 1.5
1260 */
1261 public static boolean isModalExcludedSupported()
1262 {
1263 Toolkit tk = Toolkit.getDefaultToolkit();
1264 return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1265 }
1266 /*
1267 * Default implementation for isModalExcludedSupportedImpl(), returns false.
1268 *
1269 * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1270 * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1271 *
1272 * @since 1.5
1273 */
1274 protected boolean isModalExcludedSupportedImpl()
1275 {
1276 return false;
1277 }
1278
1279 /*
1280 * Sets this window to be excluded from being modally blocked. When the
1281 * toolkit supports modal exclusion and this method is called, input
1282 * events, focus transfer and z-order will continue to work for the
1283 * window, it's owned windows and child components, even in the
1284 * presence of a modal dialog.
1285 * For details on which <code>Window</code>s are normally blocked
1286 * by modal dialog, see {@link java.awt.Dialog}.
1287 * Invoking this method when the modal exclusion API is not supported by
1288 * the current toolkit has no effect.
1289 * @param window Window to be marked as not modally blocked
1290 * @see java.awt.Dialog
1291 * @see java.awt.Dialog#setModal(boolean)
1292 * @see sun.awt.SunToolkit#isModalExcludedSupported
1293 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1294 */
1295 public static void setModalExcluded(Window window)
1296 {
1297 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1298 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1299 }
1300 window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1301 }
1302
1303 /*
1304 * Returns whether the specified window is blocked by modal dialogs.
1305 * If the modal exclusion API isn't supported by the current toolkit,
1306 * it returns false for all windows.
1307 *
1308 * @param window Window to test for modal exclusion
1309 *
1310 * @return true if the window is modal excluded, false otherwise. If
1311 * the modal exclusion isn't supported by the current Toolkit, false
1312 * is returned
1313 *
1314 * @see sun.awt.SunToolkit#isModalExcludedSupported
1315 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1316 *
1317 * @since 1.5
1318 */
1319 public static boolean isModalExcluded(Window window)
1320 {
1321 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1322 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1323 }
1324 return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1325 }
1326
1327 /**
1328 * Overridden in XToolkit and WToolkit
1329 */
1330 public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1331 return (modalityType == Dialog.ModalityType.MODELESS) ||
1332 (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1333 }
1334
1335 /**
1336 * Overridden in XToolkit and WToolkit
1337 */
1338 public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1339 return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1340 }
1341
1342 ///////////////////////////////////////////////////////////////////////////
1343 //
1344 // The following is used by the Java Plug-in to coordinate dialog modality
1345 // between containing applications (browsers, ActiveX containers etc) and
1346 // the AWT.
1347 //
1348 ///////////////////////////////////////////////////////////////////////////
1349
1350 private ModalityListenerList modalityListeners = new ModalityListenerList();
1351
1352 public void addModalityListener(ModalityListener listener) {
1353 modalityListeners.add(listener);
1354 }
1355
1356 public void removeModalityListener(ModalityListener listener) {
1357 modalityListeners.remove(listener);
1358 }
1359
1360 public void notifyModalityPushed(Dialog dialog) {
1361 notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1362 }
1363
1364 public void notifyModalityPopped(Dialog dialog) {
1365 notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1366 }
1367
1368 final void notifyModalityChange(int id, Dialog source) {
1369 ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1370 ev.dispatch();
1371 }
1372
1373 static class ModalityListenerList implements ModalityListener {
1374
1375 Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1376
1377 void add(ModalityListener listener) {
1378 listeners.addElement(listener);
1379 }
1380
1381 void remove(ModalityListener listener) {
1382 listeners.removeElement(listener);
1383 }
1384
1385 public void modalityPushed(ModalityEvent ev) {
1386 Iterator<ModalityListener> it = listeners.iterator();
1387 while (it.hasNext()) {
1388 it.next().modalityPushed(ev);
1389 }
1390 }
1391
1392 public void modalityPopped(ModalityEvent ev) {
1393 Iterator<ModalityListener> it = listeners.iterator();
1394 while (it.hasNext()) {
1395 it.next().modalityPopped(ev);
1396 }
1397 }
1398 } // end of class ModalityListenerList
1399
1400 ///////////////////////////////////////////////////////////////////////////
1401 // End Plug-in code
1402 ///////////////////////////////////////////////////////////////////////////
1403
1404 public static boolean isLightweightOrUnknown(Component comp) {
1405 if (comp.isLightweight()
1406 || !(getDefaultToolkit() instanceof SunToolkit))
1407 {
1408 return true;
1409 }
1410 return !(comp instanceof Button
1411 || comp instanceof Canvas
1412 || comp instanceof Checkbox
1413 || comp instanceof Choice
1414 || comp instanceof Label
1415 || comp instanceof java.awt.List
1416 || comp instanceof Panel
1417 || comp instanceof Scrollbar
1418 || comp instanceof ScrollPane
1419 || comp instanceof TextArea
1420 || comp instanceof TextField
1421 || comp instanceof Window);
1422 }
1423
1424 public static class OperationTimedOut extends RuntimeException {
1425 public OperationTimedOut(String msg) {
1426 super(msg);
1427 }
1428 public OperationTimedOut() {
1429 }
1430 }
1431 public static class InfiniteLoop extends RuntimeException {
1432 }
1433
1434 public static class IllegalThreadException extends RuntimeException {
1435 public IllegalThreadException(String msg) {
1436 super(msg);
1437 }
1438 public IllegalThreadException() {
1439 }
1440 }
1441
1442 public static final int DEFAULT_WAIT_TIME = 10000;
1443 private static final int MAX_ITERS = 20;
1444 private static final int MIN_ITERS = 0;
1445 private static final int MINIMAL_EDELAY = 0;
1446
1447 /**
1448 * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1449 */
1450 public void realSync() throws OperationTimedOut, InfiniteLoop {
1451 realSync(DEFAULT_WAIT_TIME);
1452 }
1453
1454 /**
1455 * Forces toolkit to synchronize with the native windowing
1456 * sub-system, flushing all pending work and waiting for all the
1457 * events to be processed. This method guarantees that after
1458 * return no additional Java events will be generated, unless
1459 * cause by user. Obviously, the method cannot be used on the
1460 * event dispatch thread (EDT). In case it nevertheless gets
1461 * invoked on this thread, the method throws the
1462 * IllegalThreadException runtime exception.
1463 *
1464 * <p> This method allows to write tests without explicit timeouts
1465 * or wait for some event. Example:
1466 * <code>
1467 * Frame f = ...;
1468 * f.setVisible(true);
1469 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1470 * </code>
1471 *
1472 * <p> After realSync, <code>f</code> will be completely visible
1473 * on the screen, its getLocationOnScreen will be returning the
1474 * right result and it will be the focus owner.
1475 *
1476 * <p> Another example:
1477 * <code>
1478 * b.requestFocus();
1479 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1480 * </code>
1481 *
1482 * <p> After realSync, <code>b</code> will be focus owner.
1483 *
1484 * <p> Notice that realSync isn't guaranteed to work if recurring
1485 * actions occur, such as if during processing of some event
1486 * another request which may generate some events occurs. By
1487 * default, sync tries to perform as much as {@value MAX_ITERS}
1488 * cycles of event processing, allowing for roughly {@value
1489 * MAX_ITERS} additional requests.
1490 *
1491 * <p> For example, requestFocus() generates native request, which
1492 * generates one or two Java focus events, which then generate a
1493 * serie of paint events, a serie of Java focus events, which then
1494 * generate a serie of paint events which then are processed -
1495 * three cycles, minimum.
1496 *
1497 * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1498 */
1499 public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1500 {
1501 if (EventQueue.isDispatchThread()) {
1502 throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1503 }
1504 int bigLoop = 0;
1505 do {
1506 // Let's do sync first
1507 sync();
1508
1509 // During the wait process, when we were processing incoming
1510 // events, we could have made some new request, which can
1511 // generate new events. Example: MapNotify/XSetInputFocus.
1512 // Therefore, we dispatch them as long as there is something
1513 // to dispatch.
1514 int iters = 0;
1515 while (iters < MIN_ITERS) {
1516 syncNativeQueue(timeout);
1517 iters++;
1518 }
1519 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1520 iters++;
1521 }
1522 if (iters >= MAX_ITERS) {
1523 throw new InfiniteLoop();
1524 }
1525
1526 // native requests were dispatched by X/Window Manager or Windows
1527 // Moreover, we processed them all on Toolkit thread
1528 // Now wait while EDT processes them.
1529 //
1530 // During processing of some events (focus, for example),
1531 // some other events could have been generated. So, after
1532 // waitForIdle, we may end up with full EventQueue
1533 iters = 0;
1534 while (iters < MIN_ITERS) {
1535 waitForIdle(timeout);
1536 iters++;
1537 }
1538 while (waitForIdle(timeout) && iters < MAX_ITERS) {
1539 iters++;
1540 }
1541 if (iters >= MAX_ITERS) {
1542 throw new InfiniteLoop();
1543 }
1544
1545 bigLoop++;
1546 // Again, for Java events, it was simple to check for new Java
1547 // events by checking event queue, but what if Java events
1548 // resulted in native requests? Therefor, check native events again.
1549 } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1550 }
1551
1552 /**
1553 * Platform toolkits need to implement this method to perform the
1554 * sync of the native queue. The method should wait until native
1555 * requests are processed, all native events are processed and
1556 * corresponding Java events are generated. Should return
1557 * <code>true</code> if some events were processed,
1558 * <code>false</code> otherwise.
1559 */
1560 protected abstract boolean syncNativeQueue(final long timeout);
1561
1562 private boolean eventDispatched = false;
1563 private boolean queueEmpty = false;
1564 private final Object waitLock = "Wait Lock";
1565
1566 private boolean isEQEmpty() {
1567 EventQueue queue = getSystemEventQueueImpl();
1568 return AWTAccessor.getEventQueueAccessor().noEvents(queue);
1569 }
1570
1571 /**
1572 * Waits for the Java event queue to empty. Ensures that all
1573 * events are processed (including paint events), and that if
1574 * recursive events were generated, they are also processed.
1575 * Should return <code>true</code> if more processing is
1576 * necessary, <code>false</code> otherwise.
1577 */
1578 protected final boolean waitForIdle(final long timeout) {
1579 flushPendingEvents();
1580 boolean queueWasEmpty = isEQEmpty();
1581 queueEmpty = false;
1582 eventDispatched = false;
1583 synchronized(waitLock) {
1584 postEvent(AppContext.getAppContext(),
1585 new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1586 public void dispatch() {
1587 // Here we block EDT. It could have some
1588 // events, it should have dispatched them by
1589 // now. So native requests could have been
1590 // generated. First, dispatch them. Then,
1591 // flush Java events again.
1592 int iters = 0;
1593 while (iters < MIN_ITERS) {
1594 syncNativeQueue(timeout);
1595 iters++;
1596 }
1597 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1598 iters++;
1599 }
1600 flushPendingEvents();
1601
1602 synchronized(waitLock) {
1603 queueEmpty = isEQEmpty();
1604 eventDispatched = true;
1605 waitLock.notifyAll();
1606 }
1607 }
1608 });
1609 try {
1610 while (!eventDispatched) {
1611 waitLock.wait();
1612 }
1613 } catch (InterruptedException ie) {
1614 return false;
1615 }
1616 }
1617
1618 try {
1619 Thread.sleep(MINIMAL_EDELAY);
1620 } catch (InterruptedException ie) {
1621 throw new RuntimeException("Interrupted");
1622 }
1623
1624 flushPendingEvents();
1625
1626 // Lock to force write-cache flush for queueEmpty.
1627 synchronized (waitLock) {
1628 return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1629 }
1630 }
1631
1632 /**
1633 * Grabs the mouse input for the given window. The window must be
1634 * visible. The window or its children do not receive any
1635 * additional mouse events besides those targeted to them. All
1636 * other events will be dispatched as before - to the respective
1637 * targets. This Window will receive UngrabEvent when automatic
1638 * ungrab is about to happen. The event can be listened to by
1639 * installing AWTEventListener with WINDOW_EVENT_MASK. See
1640 * UngrabEvent class for the list of conditions when ungrab is
1641 * about to happen.
1642 * @see UngrabEvent
1643 */
1644 public abstract void grab(Window w);
1645
1646 /**
1647 * Forces ungrab. No event will be sent.
1648 */
1649 public abstract void ungrab(Window w);
1650
1651
1652 /**
1653 * Locates the splash screen library in a platform dependent way and closes
1654 * the splash screen. Should be invoked on first top-level frame display.
1655 * @see java.awt.SplashScreen
1656 * @since 1.6
1657 */
1658 public static native void closeSplashScreen();
1659
1660 /* The following methods and variables are to support retrieving
1661 * desktop text anti-aliasing settings
1662 */
1663
1664 /* Need an instance method because setDesktopProperty(..) is protected. */
1665 private void fireDesktopFontPropertyChanges() {
1666 setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1667 SunToolkit.getDesktopFontHints());
1668 }
1669
1670 private static boolean checkedSystemAAFontSettings;
1671 private static boolean useSystemAAFontSettings;
1672 private static boolean lastExtraCondition = true;
1673 private static RenderingHints desktopFontHints;
1674
1675 /* Since Swing is the reason for this "extra condition" logic its
1676 * worth documenting it in some detail.
1677 * First, a goal is for Swing and applications to both retrieve and
1678 * use the same desktop property value so that there is complete
1679 * consistency between the settings used by JDK's Swing implementation
1680 * and 3rd party custom Swing components, custom L&Fs and any general
1681 * text rendering that wants to be consistent with these.
1682 * But by default on Solaris & Linux Swing will not use AA text over
1683 * remote X11 display (unless Xrender can be used which is TBD and may not
1684 * always be available anyway) as that is a noticeable performance hit.
1685 * So there needs to be a way to express that extra condition so that
1686 * it is seen by all clients of the desktop property API.
1687 * If this were the only condition it could be handled here as it would
1688 * be the same for any L&F and could reasonably be considered to be
1689 * a static behaviour of those systems.
1690 * But GTK currently has an additional test based on locale which is
1691 * not applied by Metal. So mixing GTK in a few locales with Metal
1692 * would mean the last one wins.
1693 * This could be stored per-app context which would work
1694 * for different applets, but wouldn't help for a single application
1695 * using GTK and some other L&F concurrently.
1696 * But it is expected this will be addressed within GTK and the font
1697 * system so is a temporary and somewhat unlikely harmless corner case.
1698 */
1699 public static void setAAFontSettingsCondition(boolean extraCondition) {
1700 if (extraCondition != lastExtraCondition) {
1701 lastExtraCondition = extraCondition;
1702 if (checkedSystemAAFontSettings) {
1703 /* Someone already asked for this info, under a different
1704 * condition.
1705 * We'll force re-evaluation instead of replicating the
1706 * logic, then notify any listeners of any change.
1707 */
1708 checkedSystemAAFontSettings = false;
1709 Toolkit tk = Toolkit.getDefaultToolkit();
1710 if (tk instanceof SunToolkit) {
1711 ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1712 }
1713 }
1714 }
1715 }
1716
1717 /* "false", "off", ""default" aren't explicitly tested, they
1718 * just fall through to produce a null return which all are equated to
1719 * "false".
1720 */
1721 private static RenderingHints getDesktopAAHintsByName(String hintname) {
1722 Object aaHint = null;
1723 hintname = hintname.toLowerCase(Locale.ENGLISH);
1724 if (hintname.equals("on")) {
1725 aaHint = VALUE_TEXT_ANTIALIAS_ON;
1726 } else if (hintname.equals("gasp")) {
1727 aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1728 } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1729 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1730 } else if (hintname.equals("lcd_hbgr")) {
1731 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1732 } else if (hintname.equals("lcd_vrgb")) {
1733 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1734 } else if (hintname.equals("lcd_vbgr")) {
1735 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1736 }
1737 if (aaHint != null) {
1738 RenderingHints map = new RenderingHints(null);
1739 map.put(KEY_TEXT_ANTIALIASING, aaHint);
1740 return map;
1741 } else {
1742 return null;
1743 }
1744 }
1745
1746 /* This method determines whether to use the system font settings,
1747 * or ignore them if a L&F has specified they should be ignored, or
1748 * to override both of these with a system property specified value.
1749 * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1750 * system property isn't applied as desktop properties are considered
1751 * to be inapplicable in that case. In that headless case although
1752 * this method will return "true" the toolkit will return a null map.
1753 */
1754 private static boolean useSystemAAFontSettings() {
1755 if (!checkedSystemAAFontSettings) {
1756 useSystemAAFontSettings = true; /* initially set this true */
1757 String systemAAFonts = null;
1758 Toolkit tk = Toolkit.getDefaultToolkit();
1759 if (tk instanceof SunToolkit) {
1760 systemAAFonts =
1761 (String)AccessController.doPrivileged(
1762 new GetPropertyAction("awt.useSystemAAFontSettings"));
1763 }
1764 if (systemAAFonts != null) {
1765 useSystemAAFontSettings =
1766 Boolean.valueOf(systemAAFonts).booleanValue();
1767 /* If it is anything other than "true", then it may be
1768 * a hint name , or it may be "off, "default", etc.
1769 */
1770 if (!useSystemAAFontSettings) {
1771 desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1772 }
1773 }
1774 /* If its still true, apply the extra condition */
1775 if (useSystemAAFontSettings) {
1776 useSystemAAFontSettings = lastExtraCondition;
1777 }
1778 checkedSystemAAFontSettings = true;
1779 }
1780 return useSystemAAFontSettings;
1781 }
1782
1783 /* A variable defined for the convenience of JDK code */
1784 public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1785
1786 /* Overridden by subclasses to return platform/desktop specific values */
1787 protected RenderingHints getDesktopAAHints() {
1788 return null;
1789 }
1790
1791 /* Subclass desktop property loading methods call this which
1792 * in turn calls the appropriate subclass implementation of
1793 * getDesktopAAHints() when system settings are being used.
1794 * Its public rather than protected because subclasses may delegate
1795 * to a helper class.
1796 */
1797 public static RenderingHints getDesktopFontHints() {
1798 if (useSystemAAFontSettings()) {
1799 Toolkit tk = Toolkit.getDefaultToolkit();
1800 if (tk instanceof SunToolkit) {
1801 Object map = ((SunToolkit)tk).getDesktopAAHints();
1802 return (RenderingHints)map;
1803 } else { /* Headless Toolkit */
1804 return null;
1805 }
1806 } else if (desktopFontHints != null) {
1807 /* cloning not necessary as the return value is cloned later, but
1808 * its harmless.
1809 */
1810 return (RenderingHints)(desktopFontHints.clone());
1811 } else {
1812 return null;
1813 }
1814 }
1815
1816
1817 public abstract boolean isDesktopSupported();
1818
1819 /*
1820 * consumeNextKeyTyped() method is not currently used,
1821 * however Swing could use it in the future.
1822 */
1823 public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1824 try {
1825 AWTAccessor.getDefaultKeyboardFocusManagerAccessor().consumeNextKeyTyped(
1826 (DefaultKeyboardFocusManager)KeyboardFocusManager.
1827 getCurrentKeyboardFocusManager(),
1828 keyEvent);
1829 } catch (ClassCastException cce) {
1830 cce.printStackTrace();
1831 }
1832 }
1833
1834 protected static void dumpPeers(final PlatformLogger aLog) {
1835 AWTAutoShutdown.getInstance().dumpPeers(aLog);
1836 }
1837
1838 /**
1839 * Returns the <code>Window</code> ancestor of the component <code>comp</code>.
1840 * @return Window ancestor of the component or component by itself if it is Window;
1841 * null, if component is not a part of window hierarchy
1842 */
1843 public static Window getContainingWindow(Component comp) {
1844 while (comp != null && !(comp instanceof Window)) {
1845 comp = comp.getParent();
1846 }
1847 return (Window)comp;
1848 }
1849
1850 private static Boolean sunAwtDisableMixing = null;
1851
1852 /**
1853 * Returns the value of "sun.awt.disableMixing" property. Default
1854 * value is {@code false}.
1855 */
1856 public synchronized static boolean getSunAwtDisableMixing() {
1857 if (sunAwtDisableMixing == null) {
1858 sunAwtDisableMixing = AccessController.doPrivileged(
1859 new GetBooleanAction("sun.awt.disableMixing"));
1860 }
1861 return sunAwtDisableMixing.booleanValue();
1862 }
1863
1864 /**
1865 * Returns true if the native GTK libraries are available. The
1866 * default implementation returns false, but UNIXToolkit overrides this
1867 * method to provide a more specific answer.
1868 */
1869 public boolean isNativeGTKAvailable() {
1870 return false;
1871 }
1872
1873 private static final Object DEACTIVATION_TIMES_MAP_KEY = new Object();
1874
1875 public synchronized void setWindowDeactivationTime(Window w, long time) {
1876 AppContext ctx = getAppContext(w);
1877 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1878 if (map == null) {
1879 map = new WeakHashMap<Window, Long>();
1880 ctx.put(DEACTIVATION_TIMES_MAP_KEY, map);
1881 }
1882 map.put(w, time);
1883 }
1884
1885 public synchronized long getWindowDeactivationTime(Window w) {
1886 AppContext ctx = getAppContext(w);
1887 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1888 if (map == null) {
1889 return -1;
1890 }
1891 Long time = map.get(w);
1892 return time == null ? -1 : time;
1893 }
1894
1895 // Cosntant alpha
1896 public boolean isWindowOpacitySupported() {
1897 return false;
1898 }
1899
1900 // Shaping
1901 public boolean isWindowShapingSupported() {
1902 return false;
1903 }
1904
1905 // Per-pixel alpha
1906 public boolean isWindowTranslucencySupported() {
1907 return false;
1908 }
1909
1910 public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1911 return false;
1912 }
1913
1914 /**
1915 * Returns true if swing backbuffer should be translucent.
1916 */
1917 public boolean isSwingBackbufferTranslucencySupported() {
1918 return false;
1919 }
1920
1921 /**
1922 * Returns whether or not a containing top level window for the passed
1923 * component is
1924 * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1925 *
1926 * @param c a Component which toplevel's to check
1927 * @return {@code true} if the passed component is not null and has a
1928 * containing toplevel window which is opaque (so per-pixel translucency
1929 * is not enabled), {@code false} otherwise
1930 * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1931 */
1932 public static boolean isContainingTopLevelOpaque(Component c) {
1933 Window w = getContainingWindow(c);
1934 return w != null && w.isOpaque();
1935 }
1936
1937 /**
1938 * Returns whether or not a containing top level window for the passed
1939 * component is
1940 * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1941 *
1942 * @param c a Component which toplevel's to check
1943 * @return {@code true} if the passed component is not null and has a
1944 * containing toplevel window which has opacity less than
1945 * 1.0f (which means that it is translucent), {@code false} otherwise
1946 * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1947 */
1948 public static boolean isContainingTopLevelTranslucent(Component c) {
1949 Window w = getContainingWindow(c);
1950 return w != null && ((Window)w).getOpacity() < 1.0f;
1951 }
1952
1953 /**
1954 * Returns whether the native system requires using the peer.updateWindow()
1955 * method to update the contents of a non-opaque window, or if usual
1956 * painting procedures are sufficient. The default return value covers
1957 * the X11 systems. On MS Windows this method is overriden in WToolkit
1958 * to return true.
1959 */
1960 public boolean needUpdateWindow() {
1961 return false;
1962 }
1963
1964 /**
1965 * Descendants of the SunToolkit should override and put their own logic here.
1966 */
1967 public int getNumberOfButtons(){
1968 return 3;
1969 }
1970
1971 /**
1972 * Checks that the given object implements/extends the given
1973 * interface/class.
1974 *
1975 * Note that using the instanceof operator causes a class to be loaded.
1976 * Using this method doesn't load a class and it can be used instead of
1977 * the instanceof operator for performance reasons.
1978 *
1979 * @param obj Object to be checked
1980 * @param type The name of the interface/class. Must be
1981 * fully-qualified interface/class name.
1982 * @return true, if this object implements/extends the given
1983 * interface/class, false, otherwise, or if obj or type is null
1984 */
1985 public static boolean isInstanceOf(Object obj, String type) {
1986 if (obj == null) return false;
1987 if (type == null) return false;
1988
1989 return isInstanceOf(obj.getClass(), type);
1990 }
1991
1992 private static boolean isInstanceOf(Class cls, String type) {
1993 if (cls == null) return false;
1994
1995 if (cls.getName().equals(type)) {
1996 return true;
1997 }
1998
1999 for (Class c : cls.getInterfaces()) {
2000 if (c.getName().equals(type)) {
2001 return true;
2002 }
2003 }
2004 return isInstanceOf(cls.getSuperclass(), type);
2005 }
2006
2007 ///////////////////////////////////////////////////////////////////////////
2008 //
2009 // The following methods help set and identify whether a particular
2010 // AWTEvent object was produced by the system or by user code. As of this
2011 // writing the only consumer is the Java Plug-In, although this information
2012 // could be useful to more clients and probably should be formalized in
2013 // the public API.
2014 //
2015 ///////////////////////////////////////////////////////////////////////////
2016
2017 public static void setSystemGenerated(AWTEvent e) {
2018 AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2019 }
2020
2021 public static boolean isSystemGenerated(AWTEvent e) {
2022 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2023 }
2024
2025 } // class SunToolkit
2026
2027
2028 /*
2029 * PostEventQueue is a Thread that runs in the same AppContext as the
2030 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2031 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2032 * events to this queue, which then calls EventQueue.postEvent().
2033 *
2034 * We do this because EventQueue.postEvent() may be overridden by client
2035 * code, and we mustn't ever call client code from the toolkit thread.
2036 */
2037 class PostEventQueue {
2038 private EventQueueItem queueHead = null;
2039 private EventQueueItem queueTail = null;
2040 private final EventQueue eventQueue;
2041
2042 // For the case when queue is cleared but events are not posted
2043 private volatile boolean isFlushing = false;
2044
2045 PostEventQueue(EventQueue eq) {
2046 eventQueue = eq;
2047 }
2048
2049 public synchronized boolean noEvents() {
2050 return queueHead == null && !isFlushing;
2051 }
2052
2053 /*
2054 * Continually post pending AWTEvents to the Java EventQueue. The method
2055 * is synchronized to ensure the flush is completed before a new event
2056 * can be posted to this queue.
2057 *
2058 * 7177040: The method couldn't be wholly synchronized because of calls
2059 * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2060 * potentially lead to deadlock
2061 */
2062 public void flush() {
2063 EventQueueItem tempQueue;
2064 synchronized (this) {
2065 tempQueue = queueHead;
2066 queueHead = queueTail = null;
2067 isFlushing = (tempQueue != null);
2068 }
2069 try {
2070 while (tempQueue != null) {
2071 eventQueue.postEvent(tempQueue.event);
2072 tempQueue = tempQueue.next;
2073 }
2074 }
2075 finally {
2076 isFlushing = false;
2077 }
2078 }
2079
2080 /*
2081 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2082 */
2083 void postEvent(AWTEvent event) {
2084 EventQueueItem item = new EventQueueItem(event);
2085
2086 synchronized (this) {
2087 if (queueHead == null) {
2088 queueHead = queueTail = item;
2089 } else {
2090 queueTail.next = item;
2091 queueTail = item;
2092 }
2093 }
2094 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2095 }
2096 } // class PostEventQueue