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