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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2010, 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 java.awt; | |
| 27 | + | |
| 28 | +import java.awt.event.InputEvent; | |
| 29 | +import java.awt.event.MouseEvent; | |
| 30 | +import java.awt.event.ActionEvent; | |
| 31 | +import java.awt.event.WindowEvent; | |
| 32 | +import java.lang.reflect.Method; | |
| 33 | +import java.security.AccessController; | |
| 34 | +import sun.security.action.GetPropertyAction; | |
| 35 | +import sun.awt.AWTAutoShutdown; | |
| 36 | +import sun.awt.SunToolkit; | |
| 37 | + | |
| 38 | +import java.util.Vector; | |
| 39 | +import sun.util.logging.PlatformLogger; | |
| 40 | + | |
| 41 | +import sun.awt.dnd.SunDragSourceContextPeer; | |
| 42 | +import sun.awt.EventQueueDelegate; | |
| 43 | + | |
| 44 | +/** | |
| 45 | + * EventDispatchThread is a package-private AWT class which takes | |
| 46 | + * events off the EventQueue and dispatches them to the appropriate | |
| 47 | + * AWT components. | |
| 48 | + * | |
| 49 | + * The Thread starts a "permanent" event pump with a call to | |
| 50 | + * pumpEvents(Conditional) in its run() method. Event handlers can choose to | |
| 51 | + * block this event pump at any time, but should start a new pump (<b>not</b> | |
| 52 | + * a new EventDispatchThread) by again calling pumpEvents(Conditional). This | |
| 53 | + * secondary event pump will exit automatically as soon as the Condtional | |
| 54 | + * evaluate()s to false and an additional Event is pumped and dispatched. | |
| 55 | + * | |
| 56 | + * @author Tom Ball | |
| 57 | + * @author Amy Fowler | |
| 58 | + * @author Fred Ecks | |
| 59 | + * @author David Mendenhall | |
| 60 | + * | |
| 61 | + * @since 1.1 | |
| 62 | + */ | |
| 63 | +class EventDispatchThread extends Thread { | |
| 64 | + | |
| 65 | + private static final PlatformLogger eventLog = PlatformLogger.getLogger("java.awt.event.EventDispatchThread"); | |
| 66 | + | |
| 67 | + private EventQueue theQueue; | |
| 68 | + private boolean doDispatch = true; | |
| 69 | + private boolean threadDeathCaught = false; | |
| 70 | + | |
| 71 | + private static final int ANY_EVENT = -1; | |
| 72 | + | |
| 73 | + private Vector<EventFilter> eventFilters = new Vector<EventFilter>(); | |
| 74 | + | |
| 75 | + EventDispatchThread(ThreadGroup group, String name, EventQueue queue) { | |
| 76 | + super(group, name); | |
| 77 | + setEventQueue(queue); | |
| 78 | + } | |
| 79 | + | |
| 80 | + /* | |
| 81 | + * Must be called on EDT only, that's why no synchronization | |
| 82 | + */ | |
| 83 | + public void stopDispatching() { | |
| 84 | + doDispatch = false; | |
| 85 | + } | |
| 86 | + | |
| 87 | + public void run() { | |
| 88 | + while (true) { | |
| 89 | + try { | |
| 90 | + pumpEvents(new Conditional() { | |
| 91 | + public boolean evaluate() { | |
| 92 | + return true; | |
| 93 | + } | |
| 94 | + }); | |
| 95 | + } finally { | |
| 96 | + EventQueue eq = getEventQueue(); | |
| 97 | + if (eq.detachDispatchThread(this) || threadDeathCaught) { | |
| 98 | + break; | |
| 99 | + } | |
| 100 | + } | |
| 101 | + } | |
| 102 | + } | |
| 103 | + | |
| 104 | + void pumpEvents(Conditional cond) { | |
| 105 | + pumpEvents(ANY_EVENT, cond); | |
| 106 | + } | |
| 107 | + | |
| 108 | + void pumpEventsForHierarchy(Conditional cond, Component modalComponent) { | |
| 109 | + pumpEventsForHierarchy(ANY_EVENT, cond, modalComponent); | |
| 110 | + } | |
| 111 | + | |
| 112 | + void pumpEvents(int id, Conditional cond) { | |
| 113 | + pumpEventsForHierarchy(id, cond, null); | |
| 114 | + } | |
| 115 | + | |
| 116 | + void pumpEventsForHierarchy(int id, Conditional cond, Component modalComponent) { | |
| 117 | + pumpEventsForFilter(id, cond, new HierarchyEventFilter(modalComponent)); | |
| 118 | + } | |
| 119 | + | |
| 120 | + void pumpEventsForFilter(Conditional cond, EventFilter filter) { | |
| 121 | + pumpEventsForFilter(ANY_EVENT, cond, filter); | |
| 122 | + } | |
| 123 | + | |
| 124 | + void pumpEventsForFilter(int id, Conditional cond, EventFilter filter) { | |
| 125 | + addEventFilter(filter); | |
| 126 | + doDispatch = true; | |
| 127 | + while (doDispatch && cond.evaluate()) { | |
| 128 | + if (isInterrupted() || !pumpOneEventForFilters(id)) { | |
| 129 | + doDispatch = false; | |
| 130 | + } | |
| 131 | + } | |
| 132 | + removeEventFilter(filter); | |
| 133 | + } | |
| 134 | + | |
| 135 | + void addEventFilter(EventFilter filter) { | |
| 136 | + eventLog.finest("adding the event filter: " + filter); | |
| 137 | + synchronized (eventFilters) { | |
| 138 | + if (!eventFilters.contains(filter)) { | |
| 139 | + if (filter instanceof ModalEventFilter) { | |
| 140 | + ModalEventFilter newFilter = (ModalEventFilter)filter; | |
| 141 | + int k = 0; | |
| 142 | + for (k = 0; k < eventFilters.size(); k++) { | |
| 143 | + EventFilter f = eventFilters.get(k); | |
| 144 | + if (f instanceof ModalEventFilter) { | |
| 145 | + ModalEventFilter cf = (ModalEventFilter)f; | |
| 146 | + if (cf.compareTo(newFilter) > 0) { | |
| 147 | + break; | |
| 148 | + } | |
| 149 | + } | |
| 150 | + } | |
| 151 | + eventFilters.add(k, filter); | |
| 152 | + } else { | |
| 153 | + eventFilters.add(filter); | |
| 154 | + } | |
| 155 | + } | |
| 156 | + } | |
| 157 | + } | |
| 158 | + | |
| 159 | + void removeEventFilter(EventFilter filter) { | |
| 160 | + eventLog.finest("removing the event filter: " + filter); | |
| 161 | + synchronized (eventFilters) { | |
| 162 | + eventFilters.remove(filter); | |
| 163 | + } | |
| 164 | + } | |
| 165 | + | |
| 166 | + boolean pumpOneEventForFilters(int id) { | |
| 167 | + AWTEvent event = null; | |
| 168 | + boolean eventOK = false; | |
| 169 | + try { | |
| 170 | + EventQueue eq = null; | |
| 171 | + EventQueueDelegate.Delegate delegate = null; | |
| 172 | + do { | |
| 173 | + // EventQueue may change during the dispatching | |
| 174 | + eq = getEventQueue(); | |
| 175 | + delegate = EventQueueDelegate.getDelegate(); | |
| 176 | + | |
| 177 | + if (delegate != null && id == ANY_EVENT) { | |
| 178 | + event = delegate.getNextEvent(eq); | |
| 179 | + } else { | |
| 180 | + event = (id == ANY_EVENT) ? eq.getNextEvent() : eq.getNextEvent(id); | |
| 181 | + } | |
| 182 | + | |
| 183 | + eventOK = true; | |
| 184 | + synchronized (eventFilters) { | |
| 185 | + for (int i = eventFilters.size() - 1; i >= 0; i--) { | |
| 186 | + EventFilter f = eventFilters.get(i); | |
| 187 | + EventFilter.FilterAction accept = f.acceptEvent(event); | |
| 188 | + if (accept == EventFilter.FilterAction.REJECT) { | |
| 189 | + eventOK = false; | |
| 190 | + break; | |
| 191 | + } else if (accept == EventFilter.FilterAction.ACCEPT_IMMEDIATELY) { | |
| 192 | + break; | |
| 193 | + } | |
| 194 | + } | |
| 195 | + } | |
| 196 | + eventOK = eventOK && SunDragSourceContextPeer.checkEvent(event); | |
| 197 | + if (!eventOK) { | |
| 198 | + event.consume(); | |
| 199 | + } | |
| 200 | + } | |
| 201 | + while (eventOK == false); | |
| 202 | + | |
| 203 | + if (eventLog.isLoggable(PlatformLogger.FINEST)) { | |
| 204 | + eventLog.finest("Dispatching: " + event); | |
| 205 | + } | |
| 206 | + | |
| 207 | + Object handle = null; | |
| 208 | + if (delegate != null) { | |
| 209 | + handle = delegate.beforeDispatch(event); | |
| 210 | + } | |
| 211 | + eq.dispatchEvent(event); | |
| 212 | + if (delegate != null) { | |
| 213 | + delegate.afterDispatch(event, handle); | |
| 214 | + } | |
| 215 | + | |
| 216 | + return true; | |
| 217 | + } | |
| 218 | + catch (ThreadDeath death) { | |
| 219 | + threadDeathCaught = true; | |
| 220 | + return false; | |
| 221 | + | |
| 222 | + } | |
| 223 | + catch (InterruptedException interruptedException) { | |
| 224 | + return false; // AppContext.dispose() interrupts all | |
| 225 | + // Threads in the AppContext | |
| 226 | + | |
| 227 | + } | |
| 228 | + catch (Throwable e) { | |
| 229 | + processException(e); | |
| 230 | + } | |
| 231 | + | |
| 232 | + return true; | |
| 233 | + } | |
| 234 | + | |
| 235 | + private void processException(Throwable e) { | |
| 236 | + if (eventLog.isLoggable(PlatformLogger.FINE)) { | |
| 237 | + eventLog.fine("Processing exception: " + e); | |
| 238 | + } | |
| 239 | + getUncaughtExceptionHandler().uncaughtException(this, e); | |
| 240 | + } | |
| 241 | + | |
| 242 | + public synchronized EventQueue getEventQueue() { | |
| 243 | + return theQueue; | |
| 244 | + } | |
| 245 | + public synchronized void setEventQueue(EventQueue eq) { | |
| 246 | + theQueue = eq; | |
| 247 | + } | |
| 248 | + | |
| 249 | + private static class HierarchyEventFilter implements EventFilter { | |
| 250 | + private Component modalComponent; | |
| 251 | + public HierarchyEventFilter(Component modalComponent) { | |
| 252 | + this.modalComponent = modalComponent; | |
| 253 | + } | |
| 254 | + public FilterAction acceptEvent(AWTEvent event) { | |
| 255 | + if (modalComponent != null) { | |
| 256 | + int eventID = event.getID(); | |
| 257 | + boolean mouseEvent = (eventID >= MouseEvent.MOUSE_FIRST) && | |
| 258 | + (eventID <= MouseEvent.MOUSE_LAST); | |
| 259 | + boolean actionEvent = (eventID >= ActionEvent.ACTION_FIRST) && | |
| 260 | + (eventID <= ActionEvent.ACTION_LAST); | |
| 261 | + boolean windowClosingEvent = (eventID == WindowEvent.WINDOW_CLOSING); | |
| 262 | + /* | |
| 263 | + * filter out MouseEvent and ActionEvent that's outside | |
| 264 | + * the modalComponent hierarchy. | |
| 265 | + * KeyEvent is handled by using enqueueKeyEvent | |
| 266 | + * in Dialog.show | |
| 267 | + */ | |
| 268 | + if (Component.isInstanceOf(modalComponent, "javax.swing.JInternalFrame")) { | |
| 269 | + /* | |
| 270 | + * Modal internal frames are handled separately. If event is | |
| 271 | + * for some component from another heavyweight than modalComp, | |
| 272 | + * it is accepted. If heavyweight is the same - we still accept | |
| 273 | + * event and perform further filtering in LightweightDispatcher | |
| 274 | + */ | |
| 275 | + return windowClosingEvent ? FilterAction.REJECT : FilterAction.ACCEPT; | |
| 276 | + } | |
| 277 | + if (mouseEvent || actionEvent || windowClosingEvent) { | |
| 278 | + Object o = event.getSource(); | |
| 279 | + if (o instanceof sun.awt.ModalExclude) { | |
| 280 | + // Exclude this object from modality and | |
| 281 | + // continue to pump it's events. | |
| 282 | + return FilterAction.ACCEPT; | |
| 283 | + } else if (o instanceof Component) { | |
| 284 | + Component c = (Component) o; | |
| 285 | + // 5.0u3 modal exclusion | |
| 286 | + boolean modalExcluded = false; | |
| 287 | + if (modalComponent instanceof Container) { | |
| 288 | + while (c != modalComponent && c != null) { | |
| 289 | + if ((c instanceof Window) && | |
| 290 | + (sun.awt.SunToolkit.isModalExcluded((Window)c))) { | |
| 291 | + // Exclude this window and all its children from | |
| 292 | + // modality and continue to pump it's events. | |
| 293 | + modalExcluded = true; | |
| 294 | + break; | |
| 295 | + } | |
| 296 | + c = c.getParent(); | |
| 297 | + } | |
| 298 | + } | |
| 299 | + if (!modalExcluded && (c != modalComponent)) { | |
| 300 | + return FilterAction.REJECT; | |
| 301 | + } | |
| 302 | + } | |
| 303 | + } | |
| 304 | + } | |
| 305 | + return FilterAction.ACCEPT; | |
| 306 | + } | |
| 307 | + } | |
| 308 | +} | |