bundles/org.simantics.g2d/src/org/simantics/g2d/participant/BackgroundPainter.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.Color;
  15 import java.awt.Paint;
  16
  17 import org.simantics.g2d.canvas.Hints;
  18 import org.simantics.g2d.canvas.SGDesignation;
  19 import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;
  20 import org.simantics.g2d.canvas.impl.HintReflection.HintListener;
  21 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;
  22 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;
  23 import org.simantics.scenegraph.g2d.G2DParentNode;
  24 import org.simantics.scenegraph.g2d.nodes.BackgroundNode;
  25 import org.simantics.utils.datastructures.hints.IHintContext.Key;
  26 import org.simantics.utils.datastructures.hints.IHintObservable;
  27
  28 /**
  29  * Paints background wither with KEY_BACKGROUND_COLOR or KEY_BACKGROUND_PAINT.
  30  *
  31  * @see Hints#KEY_BACKGROUND_COLOR
  32  * @see Hints#KEY_BACKGROUND_PAINT
  33  * @author Toni Kalajainen
  34  */
  35 public class BackgroundPainter extends AbstractCanvasParticipant {
  36
  37     protected BackgroundNode node = null;
  38
  39     @HintListener(Class=Hints.class, Field="KEY_BACKGROUND_COLOR")
  40     public void colorChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
  41         if (node != null) {
  42             Color c = getHint(Hints.KEY_BACKGROUND_COLOR);
  43             node.setColor(c);
  44             setDirty();
  45         }
  46     }
  47
  48     @HintListener(Class=Hints.class, Field="KEY_BACKGROUND_PAINT")
  49     public void paintChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {
  50         if (node != null) {
  51             Paint p = getHint(Hints.KEY_BACKGROUND_PAINT);
  52             node.setPaint(p);
  53             setDirty();
  54         }
  55     }
  56
  57     @SGInit(designation = SGDesignation.CONTROL)
  58     public void initSG(G2DParentNode parent) {
  59         node = parent.addNode("background", BackgroundNode.class);
  60         node.setZIndex(Integer.MIN_VALUE / 2);
  61
  62         Color c = getHint(Hints.KEY_BACKGROUND_COLOR);
  63         Paint p = getHint(Hints.KEY_BACKGROUND_PAINT);
  64         node.setColor(c);
  65         node.setPaint(p);
  66     }
  67
  68     @SGCleanup
  69     public void cleanupSG() {
  70         if (node != null) {
  71             node.remove();
  72             node = null;
  73         }
  74     }
  75
  76 }