bundles/org.simantics.g2d/src/org/simantics/g2d/participant/CanvasBoundsParticipant.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.g2d.participant;\r
  13 \r
  14 import java.awt.Rectangle;\r
  15 import java.awt.Shape;\r
  16 import java.awt.geom.AffineTransform;\r
  17 import java.awt.geom.Rectangle2D;\r
  18 \r
  19 import org.simantics.g2d.canvas.Hints;\r
  20 import org.simantics.g2d.canvas.ICanvasContext;\r
  21 import org.simantics.g2d.canvas.SGDesignation;\r
  22 import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;\r
  23 import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
  24 import org.simantics.g2d.canvas.impl.HintReflection.HintListener;\r
  25 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGCleanup;\r
  26 import org.simantics.g2d.canvas.impl.SGNodeReflection.SGInit;\r
  27 import org.simantics.g2d.utils.GeometryUtils;\r
  28 import org.simantics.scenegraph.g2d.G2DParentNode;\r
  29 import org.simantics.scenegraph.g2d.nodes.BoundsNode;\r
  30 import org.simantics.utils.datastructures.hints.IHintContext;\r
  31 import org.simantics.utils.datastructures.hints.IHintObservable;\r
  32 import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
  33 \r
  34 /**\r
  35  * A canvas participant that stores the current control and canvas boundaries\r
  36  * and detects their changes.\r
  37  * \r
  38  * @author Tuukka Lehtonen\r
  39  */\r
  40 public class CanvasBoundsParticipant extends AbstractCanvasParticipant {\r
  41 \r
  42     BoundsNode.ResizeListener resizeListener = new BoundsNode.ResizeListener() {\r
  43         @Override\r
  44         public void controlResized(Rectangle2D bounds) {\r
  45             controlBoundsUpdated(bounds);\r
  46         }\r
  47     };\r
  48 \r
  49     @Dependency\r
  50     private TransformUtil   util;\r
  51 \r
  52     private BoundsNode        boundsNode     = null;\r
  53 \r
  54     private Rectangle2D       controlBounds  = new Rectangle2D.Double();\r
  55 \r
  56     private Rectangle2D       canvasBounds   = new Rectangle2D.Double();\r
  57 \r
  58     @HintListener(Class=Hints.class, Field="KEY_CANVAS_TRANSFORM")\r
  59     public void selectionChanged(IHintObservable sender, Key key, Object oldValue, Object newValue) {\r
  60         // Update canvas bounds whenever canvas transform changes.\r
  61         AffineTransform inv = util.getInverseTransform((AffineTransform) newValue);\r
  62         if (inv != null) {\r
  63             canvasTransformUpdated(controlBounds, inv);\r
  64         } else {\r
  65             // TODO: what should be done here? Leave canvas bounds as they are or mark them invalid somehow ??\r
  66         }\r
  67     }\r
  68 \r
  69     @Override\r
  70     public void addedToContext(ICanvasContext ctx) {\r
  71         super.addedToContext(ctx);\r
  72         IHintContext hctx = ctx.getDefaultHintContext();\r
  73         hctx.setHint(Hints.KEY_CONTROL_BOUNDS, controlBounds);\r
  74         hctx.setHint(Hints.KEY_CANVAS_BOUNDS, canvasBounds);\r
  75     }\r
  76 \r
  77     @SGInit(designation = SGDesignation.CONTROL)\r
  78     public void initSG(G2DParentNode parent) {\r
  79         boundsNode = parent.addNode("canvasBounds", BoundsNode.class);\r
  80         boundsNode.setZIndex(Integer.MIN_VALUE);\r
  81         boundsNode.setResizeListener(resizeListener);\r
  82     }\r
  83 \r
  84     @SGCleanup\r
  85     public void cleanupSG() {\r
  86         if (boundsNode != null) {\r
  87             boundsNode.setResizeListener(null);\r
  88             boundsNode.remove();\r
  89             boundsNode = null;\r
  90         }\r
  91     }\r
  92 \r
  93     private void controlBoundsUpdated(Rectangle2D bounds) {\r
  94         if (!controlBounds.equals(bounds)) {\r
  95             setControlBounds(bounds.getBounds());\r
  96         }\r
  97         AffineTransform invTr = util.getInverseTransform();\r
  98         if (invTr != null)\r
  99             canvasTransformUpdated(controlBounds, invTr);\r
 100     }\r
 101 \r
 102     private void canvasTransformUpdated(Rectangle2D controlBounds, AffineTransform inverseViewTr) {\r
 103         Shape shape = GeometryUtils.transformShape(controlBounds, inverseViewTr);\r
 104         Rectangle2D visibleCanvasBounds = shape.getBounds2D();\r
 105         if (!canvasBounds.equals(visibleCanvasBounds)) {\r
 106             setCanvasBounds(visibleCanvasBounds);\r
 107         }\r
 108     }\r
 109 \r
 110     private void setControlBounds(Rectangle bounds) {\r
 111         //System.out.println("Set control bounds: " + bounds);\r
 112         this.controlBounds = bounds;\r
 113         IHintContext ctx = getContext().getDefaultHintContext();\r
 114         ctx.setHint(Hints.KEY_CONTROL_BOUNDS, controlBounds);\r
 115     }\r
 116 \r
 117     private void setCanvasBounds(Rectangle2D bounds) {\r
 118         //System.out.println("Set canvas bounds: " + bounds);\r
 119         this.canvasBounds = bounds;\r
 120         IHintContext ctx = getContext().getDefaultHintContext();\r
 121         ctx.setHint(Hints.KEY_CANVAS_BOUNDS, canvasBounds);\r
 122     }\r
 123 \r
 124     /**\r
 125      * @return control bounds. Returns internal state, do not modify.\r
 126      *         If the current rendering surface is pixel based, the returned\r
 127      *         {@link Rectangle2D} may also be a {@link Rectangle}.\r
 128      */\r
 129     public Rectangle2D getControlBounds() {\r
 130         return controlBounds;\r
 131     }\r
 132 \r
 133     /**\r
 134      * @return visible canvas area bounds in canvas space coordinates. Returns\r
 135      *         internal state, do not modify.\r
 136      */\r
 137     public Rectangle2D getCanvasBounds() {\r
 138         return canvasBounds;\r
 139     }\r
 140 \r
 141 }\r