bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/MouseCaptureContext.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 package org.simantics.g2d.canvas.impl;
  13
  14 import java.lang.reflect.Method;
  15 import java.util.HashMap;
  16 import java.util.HashSet;
  17 import java.util.Map;
  18 import java.util.Set;
  19
  20 import org.simantics.g2d.canvas.IMouseCaptureContext;
  21 import org.simantics.g2d.canvas.IMouseCaptureHandle;
  22 import org.simantics.g2d.canvas.IMouseCaptureHandleListener;
  23 import org.simantics.g2d.canvas.IMouseCaptureListener;
  24 import org.simantics.utils.threads.IThreadWorkQueue;
  25 import org.simantics.utils.threads.SyncListenerList;
  26
  27 /**
  28  * @author Toni Kalajainen
  29  */
  30 public class MouseCaptureContext implements IMouseCaptureContext {
  31
  32     protected Map<Integer, Set<IMouseCaptureHandle>> mouseCapture =
  33         new HashMap<Integer, Set<IMouseCaptureHandle>>();
  34
  35     protected SyncListenerList<IMouseCaptureListener> mouseCaptureListeners =
  36         new SyncListenerList<IMouseCaptureListener>(IMouseCaptureListener.class);
  37
  38     public void addMouseCaptureListener(IMouseCaptureListener listener) {
  39         mouseCaptureListeners.add(listener);
  40     }
  41     public void addMouseCaptureListener(IMouseCaptureListener listener, IThreadWorkQueue thread) {
  42         mouseCaptureListeners.add(thread, listener);
  43     }
  44     public void removeMouseCaptureListener(IMouseCaptureListener listener) {
  45         mouseCaptureListeners.remove(listener);
  46     }
  47     public void removeMouseCaptureListener(IMouseCaptureListener listener, IThreadWorkQueue thread) {
  48         mouseCaptureListeners.remove(thread, listener);
  49     }
  50
  51     private final static Method onMouseCaptured = SyncListenerList.getMethod(IMouseCaptureListener.class, "onMouseCaptured");
  52     private final static Method onMouseReleased = SyncListenerList.getMethod(IMouseCaptureListener.class, "onMouseReleased");
  53     protected void fireMouseCaptured(int mouseId) {
  54         mouseCaptureListeners.fireEventSync(onMouseCaptured, this, mouseId);
  55     }
  56     protected void fireAsyncMouseCaptured(int mouseId) {
  57         mouseCaptureListeners.fireEventAsync(onMouseCaptured, this, mouseId);
  58     }
  59     protected void fireMouseReleased(int mouseId) {
  60         mouseCaptureListeners.fireEventSync(onMouseReleased, this, mouseId);
  61     }
  62     protected void fireAsyncMouseReleased(int mouseId) {
  63         mouseCaptureListeners.fireEventAsync(onMouseReleased, this, mouseId);
  64     }
  65
  66     public synchronized IMouseCaptureHandle captureMouse(int mouseId) {
  67         Set<IMouseCaptureHandle> captures = mouseCapture.get(mouseId);
  68         IMouseCaptureHandle capture = new MouseCaptureHandle(mouseId);
  69         capture.addMouseCaptureHandleListener(new IMouseCaptureHandleListener() {
  70             @Override
  71             public void onCaptureReleased(IMouseCaptureHandle sender) {
  72                 synchronized(MouseCaptureContext.this)
  73                 {
  74                     Set<IMouseCaptureHandle> captures = mouseCapture.get(sender.mouseId());
  75                     if (!captures.contains(this)) return;
  76                     captures.remove(this);
  77                     if (captures.isEmpty()) {
  78                         mouseCapture.remove(captures);
  79                         fireMouseReleased(sender.mouseId());
  80                     }
  81                 }
  82             }});
  83         if (captures==null) {
  84             captures = new HashSet<IMouseCaptureHandle>();
  85             mouseCapture.put(mouseId, captures);
  86             fireMouseCaptured(mouseId);
  87         }
  88         captures.add(capture);
  89         return capture;
  90     }
  91
  92
  93
  94 }