bundles/org.simantics.g2d/src/org/simantics/g2d/participant/CanvasGrab.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.participant;
  13
  14 import java.awt.geom.Point2D;
  15 import java.util.HashMap;
  16 import java.util.Map;
  17
  18 import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
  19 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;
  20
  21 /**
  22  * Participant that enables grabbing of canvas.
  23  *
  24  * @See {@link HandPainter} Paints grabbing of canvas
  25  * @author Toni Kalajainen
  26  */
  27 public class CanvasGrab extends AbstractCanvasParticipant {
  28
  29         @Dependency TransformUtil util;
  30
  31     public Map<Integer, PointerInfo> grabInfo = new HashMap<Integer, PointerInfo>();
  32
  33     public PointerInfo grabCanvas(int id, Point2D pos)
  34     {
  35         PointerInfo result = new PointerInfo(pos, id);
  36         result.currentPos = pos;
  37         grabInfo.put(id, result);
  38         return result;
  39     }
  40
  41     public void releaseCanvas(int id)
  42     {
  43         grabInfo.remove(id);
  44     }
  45
  46     /** Info of pointers with left button down */
  47     public static final class PointerInfo {
  48         public final int mouseId;
  49         // Anchoring position in control coordinates
  50         public Point2D anchorPos;
  51         public Point2D currentPos;
  52         public PointerInfo(Point2D anchorPos, int mouseId) {
  53             this.anchorPos = anchorPos;
  54             this.mouseId = mouseId;
  55         }
  56     }
  57
  58     public Map<Integer, PointerInfo> getGrabInfo()
  59     {
  60         return grabInfo;
  61     }
  62
  63 }