bundles/org.simantics.scenegraph/src/org/simantics/scenegraph/g2d/events/MouseEventCoalescer.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.scenegraph.g2d.events;
  13
  14 import org.simantics.scenegraph.g2d.events.IEventQueue.EventCoalescer;
  15 import org.simantics.scenegraph.g2d.events.MouseEvent.MouseMovedEvent;
  16
  17 /**
  18  * Coalescales mouse events
  19  *
  20  * @author Toni Kalajainen
  21  */
  22 public class MouseEventCoalescer implements EventCoalescer {
  23
  24     public static final MouseEventCoalescer INSTANCE = new MouseEventCoalescer();
  25
  26     @Override
  27     public Event coalesce(Event apriori, Event aposterior) {
  28         if (!(apriori instanceof MouseMovedEvent)) return null;
  29         if (!(aposterior instanceof MouseMovedEvent)) return null;
  30         MouseMovedEvent m1 = (MouseMovedEvent) apriori;
  31         MouseMovedEvent m2 = (MouseMovedEvent) aposterior;
  32         if (m1.mouseId!=m2.mouseId) return null;
  33         return aposterior;
  34     }
  35
  36 }