1 /*
2 * Copyright (c) 1997, 2012, 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 @SuppressWarnings("deprecation")
195 public abstract FontPeer getFontPeer(String name, int style);
196
197 public abstract RobotPeer createRobot(Robot target, GraphicsDevice screen)
198 throws AWTException;
199
200 public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
201 throws HeadlessException;
202
203 /**
204 * The AWT lock is typically only used on Unix platforms to synchronize
205 * access to Xlib, OpenGL, etc. However, these methods are implemented
206 * in SunToolkit so that they can be called from shared code (e.g.
207 * from the OGL pipeline) or from the X11 pipeline regardless of whether
208 * XToolkit or MToolkit is currently in use. There are native macros
209 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
210 * methods is changed, make sure it is compatible with the native macros.
211 *
212 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
213 * used in place of:
214 * synchronized (getAWTLock()) {
215 * ...
216 * }
217 *
218 * By factoring these methods out specially, we are able to change the
219 * implementation of these methods (e.g. use more advanced locking
220 * mechanisms) without impacting calling code.
221 *
222 * Sample usage:
223 * private void doStuffWithXlib() {
224 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
225 * SunToolkit.awtLock();
226 * try {
227 * ...
228 * XlibWrapper.XDoStuff();
229 * } finally {
230 * SunToolkit.awtUnlock();
231 * }
232 * }
233 */
234
235 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
236 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
237
238 public static final void awtLock() {
239 AWT_LOCK.lock();
240 }
241
242 public static final boolean awtTryLock() {
243 return AWT_LOCK.tryLock();
244 }
245
246 public static final void awtUnlock() {
247 AWT_LOCK.unlock();
248 }
249
250 public static final void awtLockWait()
251 throws InterruptedException
252 {
253 AWT_LOCK_COND.await();
254 }
255
256 public static final void awtLockWait(long timeout)
257 throws InterruptedException
258 {
259 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
260 }
261
262 public static final void awtLockNotify() {
263 AWT_LOCK_COND.signal();
264 }
265
266 public static final void awtLockNotifyAll() {
267 AWT_LOCK_COND.signalAll();
268 }
269
270 public static final boolean isAWTLockHeldByCurrentThread() {
271 return AWT_LOCK.isHeldByCurrentThread();
272 }
273
274 /*
275 * Create a new AppContext, along with its EventQueue, for a
276 * new ThreadGroup. Browser code, for example, would use this
277 * method to create an AppContext & EventQueue for an Applet.
278 */
279 public static AppContext createNewAppContext() {
280 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
281 // Create appContext before initialization of EventQueue, so all
282 // the calls to AppContext.getAppContext() from EventQueue ctor
283 // return correct values
284 AppContext appContext = new AppContext(threadGroup);
285
286 initEQ(appContext);
287
288 return appContext;
289 }
290
291 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
292 AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
293 }
294
295 /*
296 * Fetch the peer associated with the given target (as specified
297 * in the peer creation method). This can be used to determine
298 * things like what the parent peer is. If the target is null
299 * or the target can't be found (either because the a peer was
300 * never created for it or the peer was disposed), a null will
301 * be returned.
302 */
303 protected static Object targetToPeer(Object target) {
304 if (target != null && !GraphicsEnvironment.isHeadless()) {
305 return AWTAutoShutdown.getInstance().getPeer(target);
306 }
307 return null;
308 }
309
310 protected static void targetCreatedPeer(Object target, Object peer) {
311 if (target != null && peer != null &&
312 !GraphicsEnvironment.isHeadless())
313 {
314 AWTAutoShutdown.getInstance().registerPeer(target, peer);
315 }
316 }
317
318 protected static void targetDisposedPeer(Object target, Object peer) {
319 if (target != null && peer != null &&
320 !GraphicsEnvironment.isHeadless())
321 {
322 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
323 }
324 }
325
326 // Maps from non-Component/MenuComponent to AppContext.
327 // WeakHashMap<Component,AppContext>
328 private static final Map<Object, AppContext> appContextMap =
329 Collections.synchronizedMap(new WeakHashMap<Object, AppContext>());
330
331 /**
332 * Sets the appContext field of target. If target is not a Component or
333 * MenuComponent, this returns false.
334 */
335 private static boolean setAppContext(Object target,
336 AppContext context) {
337 if (target instanceof Component) {
338 AWTAccessor.getComponentAccessor().
339 setAppContext((Component)target, context);
340 } else if (target instanceof MenuComponent) {
341 AWTAccessor.getMenuComponentAccessor().
342 setAppContext((MenuComponent)target, context);
343 } else {
344 return false;
345 }
346 return true;
347 }
348
349 /**
350 * Returns the appContext field for target. If target is not a
351 * Component or MenuComponent this returns null.
352 */
353 private static AppContext getAppContext(Object target) {
354 if (target instanceof Component) {
355 return AWTAccessor.getComponentAccessor().
356 getAppContext((Component)target);
357 } else if (target instanceof MenuComponent) {
358 return AWTAccessor.getMenuComponentAccessor().
359 getAppContext((MenuComponent)target);
360 } else {
361 return null;
362 }
363 }
364
365 /*
366 * Fetch the AppContext associated with the given target.
367 * This can be used to determine things like which EventQueue
368 * to use for posting events to a Component. If the target is
369 * null or the target can't be found, a null with be returned.
370 */
371 public static AppContext targetToAppContext(Object target) {
372 if (target == null || GraphicsEnvironment.isHeadless()) {
373 return null;
374 }
375 AppContext context = getAppContext(target);
376 if (context == null) {
377 // target is not a Component/MenuComponent, try the
378 // appContextMap.
379 context = appContextMap.get(target);
380 }
381 return context;
382 }
383
384 /**
385 * Sets the synchronous status of focus requests on lightweight
386 * components in the specified window to the specified value.
387 * If the boolean parameter is <code>true</code> then the focus
388 * requests on lightweight components will be performed
389 * synchronously, if it is <code>false</code>, then asynchronously.
390 * By default, all windows have their lightweight request status
391 * set to asynchronous.
392 * <p>
393 * The application can only set the status of lightweight focus
394 * requests to synchronous for any of its windows if it doesn't
395 * perform focus transfers between different heavyweight containers.
396 * In this case the observable focus behaviour is the same as with
397 * asynchronous status.
398 * <p>
399 * If the application performs focus transfer between different
400 * heavyweight containers and sets the lightweight focus request
401 * status to synchronous for any of its windows, then further focus
402 * behaviour is unspecified.
403 * <p>
404 * @param w window for which the lightweight focus request status
405 * should be set
406 * @param status the value of lightweight focus request status
407 */
408
409 public static void setLWRequestStatus(Window changed,boolean status){
410 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
411 };
412
413 public static void checkAndSetPolicy(Container cont) {
414 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
415 getCurrentKeyboardFocusManager().
416 getDefaultFocusTraversalPolicy();
417
418 cont.setFocusTraversalPolicy(defaultPolicy);
419 }
420
421 private static FocusTraversalPolicy createLayoutPolicy() {
422 FocusTraversalPolicy policy = null;
423 try {
424 Class<?> layoutPolicyClass =
425 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
426 policy = (FocusTraversalPolicy)layoutPolicyClass.newInstance();
427 }
428 catch (ClassNotFoundException e) {
429 assert false;
430 }
431 catch (InstantiationException e) {
432 assert false;
433 }
434 catch (IllegalAccessException e) {
435 assert false;
436 }
437
438 return policy;
439 }
440
441 /*
442 * Insert a mapping from target to AppContext, for later retrieval
443 * via targetToAppContext() above.
444 */
445 public static void insertTargetMapping(Object target, AppContext appContext) {
446 if (!GraphicsEnvironment.isHeadless()) {
447 if (!setAppContext(target, appContext)) {
448 // Target is not a Component/MenuComponent, use the private Map
449 // instead.
450 appContextMap.put(target, appContext);
451 }
452 }
453 }
454
455 /*
456 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
457 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
458 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
459 * not be called under another lock since it locks the EventQueue.
460 * See bugids 4632918, 4526597.
461 */
462 public static void postEvent(AppContext appContext, AWTEvent event) {
463 if (event == null) {
464 throw new NullPointerException();
465 }
466
467 AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
468 if (sea != null && sea.isSequencedEvent(event)) {
469 AWTEvent nested = sea.getNested(event);
470 if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
471 nested instanceof TimedWindowEvent)
472 {
473 TimedWindowEvent twe = (TimedWindowEvent)nested;
474 ((SunToolkit)Toolkit.getDefaultToolkit()).
475 setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
476 }
477 }
478
479 // All events posted via this method are system-generated.
480 // Placing the following call here reduces considerably the
481 // number of places throughout the toolkit that would
482 // otherwise have to be modified to precisely identify
483 // system-generated events.
484 setSystemGenerated(event);
485 AppContext eventContext = targetToAppContext(event.getSource());
486 if (eventContext != null && !eventContext.equals(appContext)) {
487 log.fine("Event posted on wrong app context : " + event);
488 }
489 PostEventQueue postEventQueue =
490 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
491 if (postEventQueue != null) {
492 postEventQueue.postEvent(event);
493 }
494 }
495
496 /*
497 * Post AWTEvent of high priority.
498 */
499 public static void postPriorityEvent(final AWTEvent e) {
500 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
501 public void run() {
502 AWTAccessor.getAWTEventAccessor().setPosted(e);
503 ((Component)e.getSource()).dispatchEvent(e);
504 }
505 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
506 postEvent(targetToAppContext(e.getSource()), pe);
507 }
508
509 protected static final Lock flushLock = new ReentrantLock();
510 private static boolean isFlushingPendingEvents = false;
511
512 /*
513 * Flush any pending events which haven't been posted to the AWT
514 * EventQueue yet.
515 */
516 public static void flushPendingEvents() {
517 flushLock.lock();
518 try {
519 // Don't call flushPendingEvents() recursively
520 if (!isFlushingPendingEvents) {
521 isFlushingPendingEvents = true;
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 flushLock.unlock();
532 }
533 }
534
535 public static boolean isPostEventQueueEmpty() {
536 AppContext appContext = AppContext.getAppContext();
537 PostEventQueue postEventQueue =
538 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
539 if (postEventQueue != null) {
540 return postEventQueue.noEvents();
541 } else {
542 return true;
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 SecurityManager sm = System.getSecurityManager();
722 if (sm != null) {
723 try {
724 java.security.Permission perm =
725 url.openConnection().getPermission();
726 if (perm != null) {
727 try {
728 sm.checkPermission(perm);
729 } catch (SecurityException se) {
730 // fallback to checkRead/checkConnect for pre 1.2
731 // security managers
732 if ((perm instanceof java.io.FilePermission) &&
733 perm.getActions().indexOf("read") != -1) {
734 sm.checkRead(perm.getName());
735 } else if ((perm instanceof
736 java.net.SocketPermission) &&
737 perm.getActions().indexOf("connect") != -1) {
738 sm.checkConnect(url.getHost(), url.getPort());
739 } else {
740 throw se;
741 }
742 }
743 }
744 } catch (java.io.IOException ioe) {
745 sm.checkConnect(url.getHost(), url.getPort());
746 }
747 }
748 synchronized (imgCache) {
749 Image img = (Image)imgCache.get(url);
750 if (img == null) {
751 try {
752 img = tk.createImage(new URLImageSource(url));
753 imgCache.put(url, img);
754 } catch (Exception e) {
755 }
756 }
757 return img;
758 }
759 }
760
761 static Image getImageFromHash(Toolkit tk,
762 String filename) {
763 SecurityManager security = System.getSecurityManager();
764 if (security != null) {
765 security.checkRead(filename);
766 }
767 synchronized (imgCache) {
768 Image img = (Image)imgCache.get(filename);
769 if (img == null) {
770 try {
771 img = tk.createImage(new FileImageSource(filename));
772 imgCache.put(filename, img);
773 } catch (Exception e) {
774 }
775 }
776 return img;
777 }
778 }
779
780 public Image getImage(String filename) {
781 return getImageFromHash(this, filename);
782 }
783
784 public Image getImage(URL url) {
785 return getImageFromHash(this, url);
786 }
787
788 public Image createImage(String filename) {
789 SecurityManager security = System.getSecurityManager();
790 if (security != null) {
791 security.checkRead(filename);
792 }
793 return createImage(new FileImageSource(filename));
794 }
795
796 public Image createImage(URL url) {
797 SecurityManager sm = System.getSecurityManager();
798 if (sm != null) {
799 try {
800 java.security.Permission perm =
801 url.openConnection().getPermission();
802 if (perm != null) {
803 try {
804 sm.checkPermission(perm);
805 } catch (SecurityException se) {
806 // fallback to checkRead/checkConnect for pre 1.2
807 // security managers
808 if ((perm instanceof java.io.FilePermission) &&
809 perm.getActions().indexOf("read") != -1) {
810 sm.checkRead(perm.getName());
811 } else if ((perm instanceof
812 java.net.SocketPermission) &&
813 perm.getActions().indexOf("connect") != -1) {
814 sm.checkConnect(url.getHost(), url.getPort());
815 } else {
816 throw se;
817 }
818 }
819 }
820 } catch (java.io.IOException ioe) {
821 sm.checkConnect(url.getHost(), url.getPort());
822 }
823 }
824 return createImage(new URLImageSource(url));
825 }
826
827 public Image createImage(byte[] data, int offset, int length) {
828 return createImage(new ByteArrayImageSource(data, offset, length));
829 }
830
831 public Image createImage(ImageProducer producer) {
832 return new ToolkitImage(producer);
833 }
834
835 public int checkImage(Image img, int w, int h, ImageObserver o) {
836 if (!(img instanceof ToolkitImage)) {
837 return ImageObserver.ALLBITS;
838 }
839
840 ToolkitImage tkimg = (ToolkitImage)img;
841 int repbits;
842 if (w == 0 || h == 0) {
843 repbits = ImageObserver.ALLBITS;
844 } else {
845 repbits = tkimg.getImageRep().check(o);
846 }
847 return tkimg.check(o) | repbits;
848 }
849
850 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
851 if (w == 0 || h == 0) {
852 return true;
853 }
854
855 // Must be a ToolkitImage
856 if (!(img instanceof ToolkitImage)) {
857 return true;
858 }
859
860 ToolkitImage tkimg = (ToolkitImage)img;
861 if (tkimg.hasError()) {
862 if (o != null) {
863 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
864 -1, -1, -1, -1);
865 }
866 return false;
867 }
868 ImageRepresentation ir = tkimg.getImageRep();
869 return ir.prepare(o);
870 }
871
872 /**
873 * Scans {@code imageList} for best-looking image of specified dimensions.
874 * Image can be scaled and/or padded with transparency.
875 */
876 public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
877 if (width == 0 || height == 0) {
878 return null;
879 }
880 Image bestImage = null;
881 int bestWidth = 0;
882 int bestHeight = 0;
883 double bestSimilarity = 3; //Impossibly high value
884 double bestScaleFactor = 0;
885 for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
886 //Iterate imageList looking for best matching image.
887 //'Similarity' measure is defined as good scale factor and small insets.
888 //best possible similarity is 0 (no scale, no insets).
889 //It's found while the experiments that good-looking result is achieved
890 //with scale factors x1, x3/4, x2/3, xN, x1/N.
891 Image im = i.next();
892 if (im == null) {
893 if (log.isLoggable(PlatformLogger.FINER)) {
894 log.finer("SunToolkit.getScaledIconImage: " +
895 "Skipping the image passed into Java because it's null.");
896 }
897 continue;
898 }
899 if (im instanceof ToolkitImage) {
900 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
901 ir.reconstruct(ImageObserver.ALLBITS);
902 }
903 int iw;
904 int ih;
905 try {
906 iw = im.getWidth(null);
907 ih = im.getHeight(null);
908 } catch (Exception e){
909 if (log.isLoggable(PlatformLogger.FINER)) {
910 log.finer("SunToolkit.getScaledIconImage: " +
911 "Perhaps the image passed into Java is broken. Skipping this icon.");
912 }
913 continue;
914 }
915 if (iw > 0 && ih > 0) {
916 //Calc scale factor
917 double scaleFactor = Math.min((double)width / (double)iw,
918 (double)height / (double)ih);
919 //Calculate scaled image dimensions
920 //adjusting scale factor to nearest "good" value
921 int adjw = 0;
922 int adjh = 0;
923 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
924 if (scaleFactor >= 2) {
925 //Need to enlarge image more than twice
926 //Round down scale factor to multiply by integer value
927 scaleFactor = Math.floor(scaleFactor);
928 adjw = iw * (int)scaleFactor;
929 adjh = ih * (int)scaleFactor;
930 scaleMeasure = 1.0 - 0.5 / scaleFactor;
931 } else if (scaleFactor >= 1) {
932 //Don't scale
933 scaleFactor = 1.0;
934 adjw = iw;
935 adjh = ih;
936 scaleMeasure = 0;
937 } else if (scaleFactor >= 0.75) {
938 //Multiply by 3/4
939 scaleFactor = 0.75;
940 adjw = iw * 3 / 4;
941 adjh = ih * 3 / 4;
942 scaleMeasure = 0.3;
943 } else if (scaleFactor >= 0.6666) {
944 //Multiply by 2/3
945 scaleFactor = 0.6666;
946 adjw = iw * 2 / 3;
947 adjh = ih * 2 / 3;
948 scaleMeasure = 0.33;
949 } else {
950 //Multiply size by 1/scaleDivider
951 //where scaleDivider is minimum possible integer
952 //larger than 1/scaleFactor
953 double scaleDivider = Math.ceil(1.0 / scaleFactor);
954 scaleFactor = 1.0 / scaleDivider;
955 adjw = (int)Math.round((double)iw / scaleDivider);
956 adjh = (int)Math.round((double)ih / scaleDivider);
957 scaleMeasure = 1.0 - 1.0 / scaleDivider;
958 }
959 double similarity = ((double)width - (double)adjw) / (double)width +
960 ((double)height - (double)adjh) / (double)height + //Large padding is bad
961 scaleMeasure; //Large rescale is bad
962 if (similarity < bestSimilarity) {
963 bestSimilarity = similarity;
964 bestScaleFactor = scaleFactor;
965 bestImage = im;
966 bestWidth = adjw;
967 bestHeight = adjh;
968 }
969 if (similarity == 0) break;
970 }
971 }
972 if (bestImage == null) {
973 //No images were found, possibly all are broken
974 return null;
975 }
976 BufferedImage bimage =
977 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
978 Graphics2D g = bimage.createGraphics();
979 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
980 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
981 try {
982 int x = (width - bestWidth) / 2;
983 int y = (height - bestHeight) / 2;
984 if (log.isLoggable(PlatformLogger.FINER)) {
985 log.finer("WWindowPeer.getScaledIconData() result : " +
986 "w : " + width + " h : " + height +
987 " iW : " + bestImage.getWidth(null) + " iH : " + bestImage.getHeight(null) +
988 " sim : " + bestSimilarity + " sf : " + bestScaleFactor +
989 " adjW : " + bestWidth + " adjH : " + bestHeight +
990 " x : " + x + " y : " + y);
991 }
992 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
993 } finally {
994 g.dispose();
995 }
996 return bimage;
997 }
998
999 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
1000 BufferedImage bimage = getScaledIconImage(imageList, width, height);
1001 if (bimage == null) {
1002 if (log.isLoggable(PlatformLogger.FINER)) {
1003 log.finer("SunToolkit.getScaledIconData: " +
1004 "Perhaps the image passed into Java is broken. Skipping this icon.");
1005 }
1006 return null;
1007 }
1008 Raster raster = bimage.getRaster();
1009 DataBuffer buffer = raster.getDataBuffer();
1010 return (DataBufferInt)buffer;
1011 }
1012
1013 protected EventQueue getSystemEventQueueImpl() {
1014 return getSystemEventQueueImplPP();
1015 }
1016
1017 // Package private implementation
1018 static EventQueue getSystemEventQueueImplPP() {
1019 return getSystemEventQueueImplPP(AppContext.getAppContext());
1020 }
1021
1022 public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1023 EventQueue theEventQueue =
1024 (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1025 return theEventQueue;
1026 }
1027
1028 /**
1029 * Give native peers the ability to query the native container
1030 * given a native component (eg the direct parent may be lightweight).
1031 */
1032 public static Container getNativeContainer(Component c) {
1033 return Toolkit.getNativeContainer(c);
1034 }
1035
1036 /**
1037 * Gives native peers the ability to query the closest HW component.
1038 * If the given component is heavyweight, then it returns this. Otherwise,
1039 * it goes one level up in the hierarchy and tests next component.
1040 */
1041 public static Component getHeavyweightComponent(Component c) {
1042 while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1043 c = AWTAccessor.getComponentAccessor().getParent(c);
1044 }
1045 return c;
1046 }
1047
1048 /**
1049 * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1050 */
1051 public int getFocusAcceleratorKeyMask() {
1052 return InputEvent.ALT_MASK;
1053 }
1054
1055 /**
1056 * Tests whether specified key modifiers mask can be used to enter a printable
1057 * character. This is a default implementation of this method, which reflects
1058 * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1059 * characters from the extended character set (like euro sign or math symbols)
1060 */
1061 public boolean isPrintableCharacterModifiersMask(int mods) {
1062 return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1063 }
1064
1065 /**
1066 * Returns whether popup is allowed to be shown above the task bar.
1067 * This is a default implementation of this method, which checks
1068 * corresponding security permission.
1069 */
1070 public boolean canPopupOverlapTaskBar() {
1071 boolean result = true;
1072 try {
1073 SecurityManager sm = System.getSecurityManager();
1074 if (sm != null) {
1075 sm.checkPermission(
1076 SecurityConstants.AWT.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1077 }
1078 } catch (SecurityException se) {
1079 // There is no permission to show popups over the task bar
1080 result = false;
1081 }
1082 return result;
1083 }
1084
1085 /**
1086 * Returns a new input method window, with behavior as specified in
1087 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1088 * If the inputContext is not null, the window should return it from its
1089 * getInputContext() method. The window needs to implement
1090 * sun.awt.im.InputMethodWindow.
1091 * <p>
1092 * SunToolkit subclasses can override this method to return better input
1093 * method windows.
1094 */
1095 public Window createInputMethodWindow(String title, InputContext context) {
1096 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1097 }
1098
1099 /**
1100 * Returns whether enableInputMethods should be set to true for peered
1101 * TextComponent instances on this platform. False by default.
1102 */
1103 public boolean enableInputMethodsForTextComponent() {
1104 return false;
1105 }
1106
1107 private static Locale startupLocale = null;
1108
1109 /**
1110 * Returns the locale in which the runtime was started.
1111 */
1112 public static Locale getStartupLocale() {
1113 if (startupLocale == null) {
1114 String language, region, country, variant;
1115 language = AccessController.doPrivileged(
1116 new GetPropertyAction("user.language", "en"));
1117 // for compatibility, check for old user.region property
1118 region = AccessController.doPrivileged(
1119 new GetPropertyAction("user.region"));
1120 if (region != null) {
1121 // region can be of form country, country_variant, or _variant
1122 int i = region.indexOf('_');
1123 if (i >= 0) {
1124 country = region.substring(0, i);
1125 variant = region.substring(i + 1);
1126 } else {
1127 country = region;
1128 variant = "";
1129 }
1130 } else {
1131 country = AccessController.doPrivileged(
1132 new GetPropertyAction("user.country", ""));
1133 variant = AccessController.doPrivileged(
1134 new GetPropertyAction("user.variant", ""));
1135 }
1136 startupLocale = new Locale(language, country, variant);
1137 }
1138 return startupLocale;
1139 }
1140
1141 /**
1142 * Returns the default keyboard locale of the underlying operating system
1143 */
1144 public Locale getDefaultKeyboardLocale() {
1145 return getStartupLocale();
1146 }
1147
1148 private static String dataTransfererClassName = null;
1149
1150 protected static void setDataTransfererClassName(String className) {
1151 dataTransfererClassName = className;
1152 }
1153
1154 public static String getDataTransfererClassName() {
1155 if (dataTransfererClassName == null) {
1156 Toolkit.getDefaultToolkit(); // transferer set during toolkit init
1157 }
1158 return dataTransfererClassName;
1159 }
1160
1161 // Support for window closing event notifications
1162 private transient WindowClosingListener windowClosingListener = null;
1163 /**
1164 * @see sun.awt.WindowClosingSupport#getWindowClosingListener
1165 */
1166 public WindowClosingListener getWindowClosingListener() {
1167 return windowClosingListener;
1168 }
1169 /**
1170 * @see sun.awt.WindowClosingSupport#setWindowClosingListener
1171 */
1172 public void setWindowClosingListener(WindowClosingListener wcl) {
1173 windowClosingListener = wcl;
1174 }
1175
1176 /**
1177 * @see sun.awt.WindowClosingListener#windowClosingNotify
1178 */
1179 public RuntimeException windowClosingNotify(WindowEvent event) {
1180 if (windowClosingListener != null) {
1181 return windowClosingListener.windowClosingNotify(event);
1182 } else {
1183 return null;
1184 }
1185 }
1186 /**
1187 * @see sun.awt.WindowClosingListener#windowClosingDelivered
1188 */
1189 public RuntimeException windowClosingDelivered(WindowEvent event) {
1190 if (windowClosingListener != null) {
1191 return windowClosingListener.windowClosingDelivered(event);
1192 } else {
1193 return null;
1194 }
1195 }
1196
1197 private static DefaultMouseInfoPeer mPeer = null;
1198
1199 protected synchronized MouseInfoPeer getMouseInfoPeer() {
1200 if (mPeer == null) {
1201 mPeer = new DefaultMouseInfoPeer();
1202 }
1203 return mPeer;
1204 }
1205
1206
1207 /**
1208 * Returns whether default toolkit needs the support of the xembed
1209 * from embedding host(if any).
1210 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1211 */
1212 public static boolean needsXEmbed() {
1213 String noxembed = AccessController.
1214 doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1215 if ("true".equals(noxembed)) {
1216 return false;
1217 }
1218
1219 Toolkit tk = Toolkit.getDefaultToolkit();
1220 if (tk instanceof SunToolkit) {
1221 // SunToolkit descendants should override this method to specify
1222 // concrete behavior
1223 return ((SunToolkit)tk).needsXEmbedImpl();
1224 } else {
1225 // Non-SunToolkit doubtly might support XEmbed
1226 return false;
1227 }
1228 }
1229
1230 /**
1231 * Returns whether this toolkit needs the support of the xembed
1232 * from embedding host(if any).
1233 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1234 */
1235 protected boolean needsXEmbedImpl() {
1236 return false;
1237 }
1238
1239 private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1240
1241 /**
1242 * Returns whether the XEmbed server feature is requested by
1243 * developer. If true, Toolkit should return an
1244 * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1245 */
1246 protected final boolean isXEmbedServerRequested() {
1247 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1248 }
1249
1250 /**
1251 * Returns whether the modal exclusion API is supported by the current toolkit.
1252 * When it isn't supported, calling <code>setModalExcluded</code> has no
1253 * effect, and <code>isModalExcluded</code> returns false for all windows.
1254 *
1255 * @return true if modal exclusion is supported by the toolkit, false otherwise
1256 *
1257 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1258 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1259 *
1260 * @since 1.5
1261 */
1262 public static boolean isModalExcludedSupported()
1263 {
1264 Toolkit tk = Toolkit.getDefaultToolkit();
1265 return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1266 }
1267 /*
1268 * Default implementation for isModalExcludedSupportedImpl(), returns false.
1269 *
1270 * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1271 * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1272 *
1273 * @since 1.5
1274 */
1275 protected boolean isModalExcludedSupportedImpl()
1276 {
1277 return false;
1278 }
1279
1280 /*
1281 * Sets this window to be excluded from being modally blocked. When the
1282 * toolkit supports modal exclusion and this method is called, input
1283 * events, focus transfer and z-order will continue to work for the
1284 * window, it's owned windows and child components, even in the
1285 * presence of a modal dialog.
1286 * For details on which <code>Window</code>s are normally blocked
1287 * by modal dialog, see {@link java.awt.Dialog}.
1288 * Invoking this method when the modal exclusion API is not supported by
1289 * the current toolkit has no effect.
1290 * @param window Window to be marked as not modally blocked
1291 * @see java.awt.Dialog
1292 * @see java.awt.Dialog#setModal(boolean)
1293 * @see sun.awt.SunToolkit#isModalExcludedSupported
1294 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1295 */
1296 public static void setModalExcluded(Window window)
1297 {
1298 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1299 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1300 }
1301 window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1302 }
1303
1304 /*
1305 * Returns whether the specified window is blocked by modal dialogs.
1306 * If the modal exclusion API isn't supported by the current toolkit,
1307 * it returns false for all windows.
1308 *
1309 * @param window Window to test for modal exclusion
1310 *
1311 * @return true if the window is modal excluded, false otherwise. If
1312 * the modal exclusion isn't supported by the current Toolkit, false
1313 * is returned
1314 *
1315 * @see sun.awt.SunToolkit#isModalExcludedSupported
1316 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1317 *
1318 * @since 1.5
1319 */
1320 public static boolean isModalExcluded(Window window)
1321 {
1322 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1323 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1324 }
1325 return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1326 }
1327
1328 /**
1329 * Overridden in XToolkit and WToolkit
1330 */
1331 public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1332 return (modalityType == Dialog.ModalityType.MODELESS) ||
1333 (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1334 }
1335
1336 /**
1337 * Overridden in XToolkit and WToolkit
1338 */
1339 public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1340 return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1341 }
1342
1343 ///////////////////////////////////////////////////////////////////////////
1344 //
1345 // The following is used by the Java Plug-in to coordinate dialog modality
1346 // between containing applications (browsers, ActiveX containers etc) and
1347 // the AWT.
1348 //
1349 ///////////////////////////////////////////////////////////////////////////
1350
1351 private ModalityListenerList modalityListeners = new ModalityListenerList();
1352
1353 public void addModalityListener(ModalityListener listener) {
1354 modalityListeners.add(listener);
1355 }
1356
1357 public void removeModalityListener(ModalityListener listener) {
1358 modalityListeners.remove(listener);
1359 }
1360
1361 public void notifyModalityPushed(Dialog dialog) {
1362 notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1363 }
1364
1365 public void notifyModalityPopped(Dialog dialog) {
1366 notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1367 }
1368
1369 final void notifyModalityChange(int id, Dialog source) {
1370 ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1371 ev.dispatch();
1372 }
1373
1374 static class ModalityListenerList implements ModalityListener {
1375
1376 Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1377
1378 void add(ModalityListener listener) {
1379 listeners.addElement(listener);
1380 }
1381
1382 void remove(ModalityListener listener) {
1383 listeners.removeElement(listener);
1384 }
1385
1386 public void modalityPushed(ModalityEvent ev) {
1387 Iterator<ModalityListener> it = listeners.iterator();
1388 while (it.hasNext()) {
1389 it.next().modalityPushed(ev);
1390 }
1391 }
1392
1393 public void modalityPopped(ModalityEvent ev) {
1394 Iterator<ModalityListener> it = listeners.iterator();
1395 while (it.hasNext()) {
1396 it.next().modalityPopped(ev);
1397 }
1398 }
1399 } // end of class ModalityListenerList
1400
1401 ///////////////////////////////////////////////////////////////////////////
1402 // End Plug-in code
1403 ///////////////////////////////////////////////////////////////////////////
1404
1405 public static boolean isLightweightOrUnknown(Component comp) {
1406 if (comp.isLightweight()
1407 || !(getDefaultToolkit() instanceof SunToolkit))
1408 {
1409 return true;
1410 }
1411 return !(comp instanceof Button
1412 || comp instanceof Canvas
1413 || comp instanceof Checkbox
1414 || comp instanceof Choice
1415 || comp instanceof Label
1416 || comp instanceof java.awt.List
1417 || comp instanceof Panel
1418 || comp instanceof Scrollbar
1419 || comp instanceof ScrollPane
1420 || comp instanceof TextArea
1421 || comp instanceof TextField
1422 || comp instanceof Window);
1423 }
1424
1425 @SuppressWarnings("serial")
1426 public static class OperationTimedOut extends RuntimeException {
1427 public OperationTimedOut(String msg) {
1428 super(msg);
1429 }
1430 public OperationTimedOut() {
1431 }
1432 }
1433
1434 @SuppressWarnings("serial")
1435 public static class InfiniteLoop extends RuntimeException {
1436 }
1437
1438 @SuppressWarnings("serial")
1439 public static class IllegalThreadException extends RuntimeException {
1440 public IllegalThreadException(String msg) {
1441 super(msg);
1442 }
1443 public IllegalThreadException() {
1444 }
1445 }
1446
1447 public static final int DEFAULT_WAIT_TIME = 10000;
1448 private static final int MAX_ITERS = 20;
1449 private static final int MIN_ITERS = 0;
1450 private static final int MINIMAL_EDELAY = 0;
1451
1452 /**
1453 * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1454 */
1455 public void realSync() throws OperationTimedOut, InfiniteLoop {
1456 realSync(DEFAULT_WAIT_TIME);
1457 }
1458
1459 /**
1460 * Forces toolkit to synchronize with the native windowing
1461 * sub-system, flushing all pending work and waiting for all the
1462 * events to be processed. This method guarantees that after
1463 * return no additional Java events will be generated, unless
1464 * cause by user. Obviously, the method cannot be used on the
1465 * event dispatch thread (EDT). In case it nevertheless gets
1466 * invoked on this thread, the method throws the
1467 * IllegalThreadException runtime exception.
1468 *
1469 * <p> This method allows to write tests without explicit timeouts
1470 * or wait for some event. Example:
1471 * <code>
1472 * Frame f = ...;
1473 * f.setVisible(true);
1474 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1475 * </code>
1476 *
1477 * <p> After realSync, <code>f</code> will be completely visible
1478 * on the screen, its getLocationOnScreen will be returning the
1479 * right result and it will be the focus owner.
1480 *
1481 * <p> Another example:
1482 * <code>
1483 * b.requestFocus();
1484 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1485 * </code>
1486 *
1487 * <p> After realSync, <code>b</code> will be focus owner.
1488 *
1489 * <p> Notice that realSync isn't guaranteed to work if recurring
1490 * actions occur, such as if during processing of some event
1491 * another request which may generate some events occurs. By
1492 * default, sync tries to perform as much as {@value MAX_ITERS}
1493 * cycles of event processing, allowing for roughly {@value
1494 * MAX_ITERS} additional requests.
1495 *
1496 * <p> For example, requestFocus() generates native request, which
1497 * generates one or two Java focus events, which then generate a
1498 * serie of paint events, a serie of Java focus events, which then
1499 * generate a serie of paint events which then are processed -
1500 * three cycles, minimum.
1501 *
1502 * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1503 */
1504 public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1505 {
1506 if (EventQueue.isDispatchThread()) {
1507 throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1508 }
1509 int bigLoop = 0;
1510 do {
1511 // Let's do sync first
1512 sync();
1513
1514 // During the wait process, when we were processing incoming
1515 // events, we could have made some new request, which can
1516 // generate new events. Example: MapNotify/XSetInputFocus.
1517 // Therefore, we dispatch them as long as there is something
1518 // to dispatch.
1519 int iters = 0;
1520 while (iters < MIN_ITERS) {
1521 syncNativeQueue(timeout);
1522 iters++;
1523 }
1524 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1525 iters++;
1526 }
1527 if (iters >= MAX_ITERS) {
1528 throw new InfiniteLoop();
1529 }
1530
1531 // native requests were dispatched by X/Window Manager or Windows
1532 // Moreover, we processed them all on Toolkit thread
1533 // Now wait while EDT processes them.
1534 //
1535 // During processing of some events (focus, for example),
1536 // some other events could have been generated. So, after
1537 // waitForIdle, we may end up with full EventQueue
1538 iters = 0;
1539 while (iters < MIN_ITERS) {
1540 waitForIdle(timeout);
1541 iters++;
1542 }
1543 while (waitForIdle(timeout) && iters < MAX_ITERS) {
1544 iters++;
1545 }
1546 if (iters >= MAX_ITERS) {
1547 throw new InfiniteLoop();
1548 }
1549
1550 bigLoop++;
1551 // Again, for Java events, it was simple to check for new Java
1552 // events by checking event queue, but what if Java events
1553 // resulted in native requests? Therefor, check native events again.
1554 } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1555 }
1556
1557 /**
1558 * Platform toolkits need to implement this method to perform the
1559 * sync of the native queue. The method should wait until native
1560 * requests are processed, all native events are processed and
1561 * corresponding Java events are generated. Should return
1562 * <code>true</code> if some events were processed,
1563 * <code>false</code> otherwise.
1564 */
1565 protected abstract boolean syncNativeQueue(final long timeout);
1566
1567 private boolean eventDispatched = false;
1568 private boolean queueEmpty = false;
1569 private final Object waitLock = "Wait Lock";
1570
1571 private boolean isEQEmpty() {
1572 EventQueue queue = getSystemEventQueueImpl();
1573 return AWTAccessor.getEventQueueAccessor().noEvents(queue);
1574 }
1575
1576 /**
1577 * Waits for the Java event queue to empty. Ensures that all
1578 * events are processed (including paint events), and that if
1579 * recursive events were generated, they are also processed.
1580 * Should return <code>true</code> if more processing is
1581 * necessary, <code>false</code> otherwise.
1582 */
1583 @SuppressWarnings("serial")
1584 protected final boolean waitForIdle(final long timeout) {
1585 flushPendingEvents();
1586 boolean queueWasEmpty = isEQEmpty();
1587 queueEmpty = false;
1588 eventDispatched = false;
1589 synchronized(waitLock) {
1590 postEvent(AppContext.getAppContext(),
1591 new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1592 public void dispatch() {
1593 // Here we block EDT. It could have some
1594 // events, it should have dispatched them by
1595 // now. So native requests could have been
1596 // generated. First, dispatch them. Then,
1597 // flush Java events again.
1598 int iters = 0;
1599 while (iters < MIN_ITERS) {
1600 syncNativeQueue(timeout);
1601 iters++;
1602 }
1603 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1604 iters++;
1605 }
1606 flushPendingEvents();
1607
1608 synchronized(waitLock) {
1609 queueEmpty = isEQEmpty();
1610 eventDispatched = true;
1611 waitLock.notifyAll();
1612 }
1613 }
1614 });
1615 try {
1616 while (!eventDispatched) {
1617 waitLock.wait();
1618 }
1619 } catch (InterruptedException ie) {
1620 return false;
1621 }
1622 }
1623
1624 try {
1625 Thread.sleep(MINIMAL_EDELAY);
1626 } catch (InterruptedException ie) {
1627 throw new RuntimeException("Interrupted");
1628 }
1629
1630 flushPendingEvents();
1631
1632 // Lock to force write-cache flush for queueEmpty.
1633 synchronized (waitLock) {
1634 return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1635 }
1636 }
1637
1638 /**
1639 * Grabs the mouse input for the given window. The window must be
1640 * visible. The window or its children do not receive any
1641 * additional mouse events besides those targeted to them. All
1642 * other events will be dispatched as before - to the respective
1643 * targets. This Window will receive UngrabEvent when automatic
1644 * ungrab is about to happen. The event can be listened to by
1645 * installing AWTEventListener with WINDOW_EVENT_MASK. See
1646 * UngrabEvent class for the list of conditions when ungrab is
1647 * about to happen.
1648 * @see UngrabEvent
1649 */
1650 public abstract void grab(Window w);
1651
1652 /**
1653 * Forces ungrab. No event will be sent.
1654 */
1655 public abstract void ungrab(Window w);
1656
1657
1658 /**
1659 * Locates the splash screen library in a platform dependent way and closes
1660 * the splash screen. Should be invoked on first top-level frame display.
1661 * @see java.awt.SplashScreen
1662 * @since 1.6
1663 */
1664 public static native void closeSplashScreen();
1665
1666 /* The following methods and variables are to support retrieving
1667 * desktop text anti-aliasing settings
1668 */
1669
1670 /* Need an instance method because setDesktopProperty(..) is protected. */
1671 private void fireDesktopFontPropertyChanges() {
1672 setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1673 SunToolkit.getDesktopFontHints());
1674 }
1675
1676 private static boolean checkedSystemAAFontSettings;
1677 private static boolean useSystemAAFontSettings;
1678 private static boolean lastExtraCondition = true;
1679 private static RenderingHints desktopFontHints;
1680
1681 /* Since Swing is the reason for this "extra condition" logic its
1682 * worth documenting it in some detail.
1683 * First, a goal is for Swing and applications to both retrieve and
1684 * use the same desktop property value so that there is complete
1685 * consistency between the settings used by JDK's Swing implementation
1686 * and 3rd party custom Swing components, custom L&Fs and any general
1687 * text rendering that wants to be consistent with these.
1688 * But by default on Solaris & Linux Swing will not use AA text over
1689 * remote X11 display (unless Xrender can be used which is TBD and may not
1690 * always be available anyway) as that is a noticeable performance hit.
1691 * So there needs to be a way to express that extra condition so that
1692 * it is seen by all clients of the desktop property API.
1693 * If this were the only condition it could be handled here as it would
1694 * be the same for any L&F and could reasonably be considered to be
1695 * a static behaviour of those systems.
1696 * But GTK currently has an additional test based on locale which is
1697 * not applied by Metal. So mixing GTK in a few locales with Metal
1698 * would mean the last one wins.
1699 * This could be stored per-app context which would work
1700 * for different applets, but wouldn't help for a single application
1701 * using GTK and some other L&F concurrently.
1702 * But it is expected this will be addressed within GTK and the font
1703 * system so is a temporary and somewhat unlikely harmless corner case.
1704 */
1705 public static void setAAFontSettingsCondition(boolean extraCondition) {
1706 if (extraCondition != lastExtraCondition) {
1707 lastExtraCondition = extraCondition;
1708 if (checkedSystemAAFontSettings) {
1709 /* Someone already asked for this info, under a different
1710 * condition.
1711 * We'll force re-evaluation instead of replicating the
1712 * logic, then notify any listeners of any change.
1713 */
1714 checkedSystemAAFontSettings = false;
1715 Toolkit tk = Toolkit.getDefaultToolkit();
1716 if (tk instanceof SunToolkit) {
1717 ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1718 }
1719 }
1720 }
1721 }
1722
1723 /* "false", "off", ""default" aren't explicitly tested, they
1724 * just fall through to produce a null return which all are equated to
1725 * "false".
1726 */
1727 private static RenderingHints getDesktopAAHintsByName(String hintname) {
1728 Object aaHint = null;
1729 hintname = hintname.toLowerCase(Locale.ENGLISH);
1730 if (hintname.equals("on")) {
1731 aaHint = VALUE_TEXT_ANTIALIAS_ON;
1732 } else if (hintname.equals("gasp")) {
1733 aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1734 } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1735 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1736 } else if (hintname.equals("lcd_hbgr")) {
1737 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1738 } else if (hintname.equals("lcd_vrgb")) {
1739 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1740 } else if (hintname.equals("lcd_vbgr")) {
1741 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1742 }
1743 if (aaHint != null) {
1744 RenderingHints map = new RenderingHints(null);
1745 map.put(KEY_TEXT_ANTIALIASING, aaHint);
1746 return map;
1747 } else {
1748 return null;
1749 }
1750 }
1751
1752 /* This method determines whether to use the system font settings,
1753 * or ignore them if a L&F has specified they should be ignored, or
1754 * to override both of these with a system property specified value.
1755 * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1756 * system property isn't applied as desktop properties are considered
1757 * to be inapplicable in that case. In that headless case although
1758 * this method will return "true" the toolkit will return a null map.
1759 */
1760 private static boolean useSystemAAFontSettings() {
1761 if (!checkedSystemAAFontSettings) {
1762 useSystemAAFontSettings = true; /* initially set this true */
1763 String systemAAFonts = null;
1764 Toolkit tk = Toolkit.getDefaultToolkit();
1765 if (tk instanceof SunToolkit) {
1766 systemAAFonts =
1767 AccessController.doPrivileged(
1768 new GetPropertyAction("awt.useSystemAAFontSettings"));
1769 }
1770 if (systemAAFonts != null) {
1771 useSystemAAFontSettings =
1772 Boolean.valueOf(systemAAFonts).booleanValue();
1773 /* If it is anything other than "true", then it may be
1774 * a hint name , or it may be "off, "default", etc.
1775 */
1776 if (!useSystemAAFontSettings) {
1777 desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1778 }
1779 }
1780 /* If its still true, apply the extra condition */
1781 if (useSystemAAFontSettings) {
1782 useSystemAAFontSettings = lastExtraCondition;
1783 }
1784 checkedSystemAAFontSettings = true;
1785 }
1786 return useSystemAAFontSettings;
1787 }
1788
1789 /* A variable defined for the convenience of JDK code */
1790 public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1791
1792 /* Overridden by subclasses to return platform/desktop specific values */
1793 protected RenderingHints getDesktopAAHints() {
1794 return null;
1795 }
1796
1797 /* Subclass desktop property loading methods call this which
1798 * in turn calls the appropriate subclass implementation of
1799 * getDesktopAAHints() when system settings are being used.
1800 * Its public rather than protected because subclasses may delegate
1801 * to a helper class.
1802 */
1803 public static RenderingHints getDesktopFontHints() {
1804 if (useSystemAAFontSettings()) {
1805 Toolkit tk = Toolkit.getDefaultToolkit();
1806 if (tk instanceof SunToolkit) {
1807 Object map = ((SunToolkit)tk).getDesktopAAHints();
1808 return (RenderingHints)map;
1809 } else { /* Headless Toolkit */
1810 return null;
1811 }
1812 } else if (desktopFontHints != null) {
1813 /* cloning not necessary as the return value is cloned later, but
1814 * its harmless.
1815 */
1816 return (RenderingHints)(desktopFontHints.clone());
1817 } else {
1818 return null;
1819 }
1820 }
1821
1822
1823 public abstract boolean isDesktopSupported();
1824
1825 /*
1826 * consumeNextKeyTyped() method is not currently used,
1827 * however Swing could use it in the future.
1828 */
1829 public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1830 try {
1831 AWTAccessor.getDefaultKeyboardFocusManagerAccessor().consumeNextKeyTyped(
1832 (DefaultKeyboardFocusManager)KeyboardFocusManager.
1833 getCurrentKeyboardFocusManager(),
1834 keyEvent);
1835 } catch (ClassCastException cce) {
1836 cce.printStackTrace();
1837 }
1838 }
1839
1840 protected static void dumpPeers(final PlatformLogger aLog) {
1841 AWTAutoShutdown.getInstance().dumpPeers(aLog);
1842 }
1843
1844 /**
1845 * Returns the <code>Window</code> ancestor of the component <code>comp</code>.
1846 * @return Window ancestor of the component or component by itself if it is Window;
1847 * null, if component is not a part of window hierarchy
1848 */
1849 public static Window getContainingWindow(Component comp) {
1850 while (comp != null && !(comp instanceof Window)) {
1851 comp = comp.getParent();
1852 }
1853 return (Window)comp;
1854 }
1855
1856 private static Boolean sunAwtDisableMixing = null;
1857
1858 /**
1859 * Returns the value of "sun.awt.disableMixing" property. Default
1860 * value is {@code false}.
1861 */
1862 public synchronized static boolean getSunAwtDisableMixing() {
1863 if (sunAwtDisableMixing == null) {
1864 sunAwtDisableMixing = AccessController.doPrivileged(
1865 new GetBooleanAction("sun.awt.disableMixing"));
1866 }
1867 return sunAwtDisableMixing.booleanValue();
1868 }
1869
1870 /**
1871 * Returns true if the native GTK libraries are available. The
1872 * default implementation returns false, but UNIXToolkit overrides this
1873 * method to provide a more specific answer.
1874 */
1875 public boolean isNativeGTKAvailable() {
1876 return false;
1877 }
1878
1879 private static final Object DEACTIVATION_TIMES_MAP_KEY = new Object();
1880
1881 public synchronized void setWindowDeactivationTime(Window w, long time) {
1882 AppContext ctx = getAppContext(w);
1883 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1884 if (map == null) {
1885 map = new WeakHashMap<Window, Long>();
1886 ctx.put(DEACTIVATION_TIMES_MAP_KEY, map);
1887 }
1888 map.put(w, time);
1889 }
1890
1891 public synchronized long getWindowDeactivationTime(Window w) {
1892 AppContext ctx = getAppContext(w);
1893 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1894 if (map == null) {
1895 return -1;
1896 }
1897 Long time = map.get(w);
1898 return time == null ? -1 : time;
1899 }
1900
1901 // Cosntant alpha
1902 public boolean isWindowOpacitySupported() {
1903 return false;
1904 }
1905
1906 // Shaping
1907 public boolean isWindowShapingSupported() {
1908 return false;
1909 }
1910
1911 // Per-pixel alpha
1912 public boolean isWindowTranslucencySupported() {
1913 return false;
1914 }
1915
1916 public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1917 return false;
1918 }
1919
1920 /**
1921 * Returns true if swing backbuffer should be translucent.
1922 */
1923 public boolean isSwingBackbufferTranslucencySupported() {
1924 return false;
1925 }
1926
1927 /**
1928 * Returns whether or not a containing top level window for the passed
1929 * component is
1930 * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1931 *
1932 * @param c a Component which toplevel's to check
1933 * @return {@code true} if the passed component is not null and has a
1934 * containing toplevel window which is opaque (so per-pixel translucency
1935 * is not enabled), {@code false} otherwise
1936 * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1937 */
1938 public static boolean isContainingTopLevelOpaque(Component c) {
1939 Window w = getContainingWindow(c);
1940 return w != null && w.isOpaque();
1941 }
1942
1943 /**
1944 * Returns whether or not a containing top level window for the passed
1945 * component is
1946 * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1947 *
1948 * @param c a Component which toplevel's to check
1949 * @return {@code true} if the passed component is not null and has a
1950 * containing toplevel window which has opacity less than
1951 * 1.0f (which means that it is translucent), {@code false} otherwise
1952 * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1953 */
1954 public static boolean isContainingTopLevelTranslucent(Component c) {
1955 Window w = getContainingWindow(c);
1956 return w != null && w.getOpacity() < 1.0f;
1957 }
1958
1959 /**
1960 * Returns whether the native system requires using the peer.updateWindow()
1961 * method to update the contents of a non-opaque window, or if usual
1962 * painting procedures are sufficient. The default return value covers
1963 * the X11 systems. On MS Windows this method is overriden in WToolkit
1964 * to return true.
1965 */
1966 public boolean needUpdateWindow() {
1967 return false;
1968 }
1969
1970 /**
1971 * Descendants of the SunToolkit should override and put their own logic here.
1972 */
1973 public int getNumberOfButtons(){
1974 return 3;
1975 }
1976
1977 /**
1978 * Checks that the given object implements/extends the given
1979 * interface/class.
1980 *
1981 * Note that using the instanceof operator causes a class to be loaded.
1982 * Using this method doesn't load a class and it can be used instead of
1983 * the instanceof operator for performance reasons.
1984 *
1985 * @param obj Object to be checked
1986 * @param type The name of the interface/class. Must be
1987 * fully-qualified interface/class name.
1988 * @return true, if this object implements/extends the given
1989 * interface/class, false, otherwise, or if obj or type is null
1990 */
1991 public static boolean isInstanceOf(Object obj, String type) {
1992 if (obj == null) return false;
1993 if (type == null) return false;
1994
1995 return isInstanceOf(obj.getClass(), type);
1996 }
1997
1998 private static boolean isInstanceOf(Class<?> cls, String type) {
1999 if (cls == null) return false;
2000
2001 if (cls.getName().equals(type)) {
2002 return true;
2003 }
2004
2005 for (Class<?> c : cls.getInterfaces()) {
2006 if (c.getName().equals(type)) {
2007 return true;
2008 }
2009 }
2010 return isInstanceOf(cls.getSuperclass(), type);
2011 }
2012
2013 ///////////////////////////////////////////////////////////////////////////
2014 //
2015 // The following methods help set and identify whether a particular
2016 // AWTEvent object was produced by the system or by user code. As of this
2017 // writing the only consumer is the Java Plug-In, although this information
2018 // could be useful to more clients and probably should be formalized in
2019 // the public API.
2020 //
2021 ///////////////////////////////////////////////////////////////////////////
2022
2023 public static void setSystemGenerated(AWTEvent e) {
2024 AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2025 }
2026
2027 public static boolean isSystemGenerated(AWTEvent e) {
2028 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2029 }
2030
2031 } // class SunToolkit
2032
2033
2034 /*
2035 * PostEventQueue is a Thread that runs in the same AppContext as the
2036 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2037 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2038 * events to this queue, which then calls EventQueue.postEvent().
2039 *
2040 * We do this because EventQueue.postEvent() may be overridden by client
2041 * code, and we mustn't ever call client code from the toolkit thread.
2042 */
2043 class PostEventQueue {
2044 private EventQueueItem queueHead = null;
2045 private EventQueueItem queueTail = null;
2046 private final EventQueue eventQueue;
2047
2048 // For the case when queue is cleared but events are not posted
2049 private volatile boolean isFlushing = false;
2050
2051 PostEventQueue(EventQueue eq) {
2052 eventQueue = eq;
2053 }
2054
2055 public synchronized boolean noEvents() {
2056 return queueHead == null && !isFlushing;
2057 }
2058
2059 /*
2060 * Continually post pending AWTEvents to the Java EventQueue. The method
2061 * is synchronized to ensure the flush is completed before a new event
2062 * can be posted to this queue.
2063 *
2064 * 7177040: The method couldn't be wholly synchronized because of calls
2065 * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2066 * potentially lead to deadlock
2067 */
2068 public void flush() {
2069 EventQueueItem tempQueue;
2070 synchronized (this) {
2071 tempQueue = queueHead;
2072 queueHead = queueTail = null;
2073 isFlushing = true;
2074 }
2075 try {
2076 while (tempQueue != null) {
2077 eventQueue.postEvent(tempQueue.event);
2078 tempQueue = tempQueue.next;
2079 }
2080 }
2081 finally {
2082 isFlushing = false;
2083 }
2084 }
2085
2086 /*
2087 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2088 */
2089 void postEvent(AWTEvent event) {
2090 EventQueueItem item = new EventQueueItem(event);
2091
2092 synchronized (this) {
2093 if (queueHead == null) {
2094 queueHead = queueTail = item;
2095 } else {
2096 queueTail.next = item;
2097 queueTail = item;
2098 }
2099 }
2100 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2101 }
2102 } // class PostEventQueue