bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/EventHandlerStack.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 /*
  13  *
  14  * @author Toni Kalajainen
  15  */
  16 package org.simantics.scenegraph.g2d.events;
  17
  18 import java.util.concurrent.atomic.AtomicBoolean;
  19
  20 import org.simantics.utils.datastructures.prioritystack.PriorityStack;
  21 import org.simantics.utils.threads.CurrentThread;
  22 import org.simantics.utils.threads.IThreadWorkQueue;
  23 import org.simantics.utils.threads.ThreadUtils;
  24
  25 /**
  26  * @see IEventHandlerStack
  27  *
  28  * @author Toni Kalajainen
  29  */
  30 public class EventHandlerStack extends PriorityStack<IEventHandler> implements IEventHandlerStack {
  31
  32     IThreadWorkQueue thread;
  33
  34     /**
  35      * Creates a new event handler stack.
  36      *
  37      * Any event handled with this stack is handled in current thread.
  38      */
  39     public EventHandlerStack() {
  40         super(IEventHandler.class);
  41         this.thread = CurrentThread.getThreadAccess();
  42     }
  43
  44     /**
  45      * Creates a new event handler stack. Any event handled with this stack is
  46      * handled in the given thread.
  47      *
  48      * @param eventHandlingThread
  49      */
  50     public EventHandlerStack(IThreadWorkQueue eventHandlingThread) {
  51         super(IEventHandler.class);
  52         this.thread = eventHandlingThread;
  53     }
  54
  55     @Override
  56     public int getEventMask() {
  57         return EventTypes.AnyMask;
  58     }
  59
  60     @Override
  61     public boolean handleEvent(final Event e) {
  62         final int eventType = EventTypes.toTypeMask(e);
  63         if (thread.currentThreadAccess()) {
  64             // Send event through interactor stack
  65             IEventHandler list[] = toArray();
  66             for (int i = list.length - 1; i >= 0; i--)
  67                 if (EventTypes.passes(list[i], eventType) && list[i].handleEvent(e))
  68                     return true;
  69             return false;
  70         } else {
  71             final AtomicBoolean result = new AtomicBoolean(false);
  72             Runnable run = new Runnable() {
  73                 @Override
  74                 public void run() {
  75                     // Send event through interactor stack
  76                     IEventHandler list[] = toArray();
  77                     for (int i = list.length - 1; i >= 0; i--)
  78                         if (EventTypes.passes(list[i], eventType) && list[i].handleEvent(e)) {
  79                             result.set(true);
  80                             return;
  81                         }
  82                 }
  83             };
  84             ThreadUtils.syncExec(thread, run);
  85             return result.get();
  86         }
  87     }
  88
  89 }