bundles/org.simantics.g2d/src/org/simantics/g2d/participant/KeyUtil.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.g2d.participant;
  17
  18 import java.util.HashSet;
  19 import java.util.Set;
  20
  21 import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
  22 import org.simantics.scenegraph.g2d.events.KeyEvent;
  23 import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;
  24 import org.simantics.scenegraph.g2d.events.KeyEvent.KeyPressedEvent;
  25 import org.simantics.scenegraph.g2d.events.KeyEvent.KeyReleasedEvent;
  26
  27
  28 /**
  29  * KeyStatus monitors statuses of keys.
  30  * @see java.awt.event.KeyEvent
  31  */
  32 public class KeyUtil extends AbstractCanvasParticipant {
  33
  34         /** Key info */
  35     private Set<Integer> pressedByKeyCode = new HashSet<Integer>();
  36     private Set<Character> pressedByChar = new HashSet<Character>();
  37
  38     @EventHandler(priority = Integer.MAX_VALUE)
  39     public boolean handleClick(KeyEvent e) {
  40         if (e instanceof KeyPressedEvent) {
  41             pressedByKeyCode.add(e.keyCode);
  42             pressedByChar.add(e.character);
  43         } else
  44         if (e instanceof KeyReleasedEvent) {
  45             pressedByKeyCode.remove(e.keyCode);
  46             pressedByChar.remove(e.character);
  47         }
  48         return false;
  49     }
  50
  51     public boolean isCharPressed(char c)
  52     {
  53         return pressedByChar.contains(c);
  54     }
  55
  56     /**
  57      * See awt key event
  58      * @see java.awt.event.KeyEvent
  59      * @param keyCode
  60      * @return
  61      */
  62     public boolean isKeyPressed(int keyCode)
  63     {
  64         return pressedByKeyCode.contains(keyCode);
  65     }
  66
  67 }