bundles/org.simantics.graphviz.ui/src/org/simantics/graphviz/ui/GraphvizComponent2.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.graphviz.ui;
  13
  14 import java.awt.Canvas;
  15 import java.awt.Frame;
  16 import java.util.concurrent.atomic.AtomicBoolean;
  17
  18 import javax.swing.SwingUtilities;
  19
  20 import org.eclipse.swt.SWT;
  21 import org.eclipse.swt.awt.SWT_AWT;
  22 import org.eclipse.swt.widgets.Composite;
  23 import org.simantics.graphviz.Graph;
  24 import org.simantics.graphviz.continuation.Computation;
  25 import org.simantics.graphviz.continuation.Continuation;
  26 import org.simantics.graphviz.drawable.GraphDrawable2;
  27 import org.simantics.graphviz.drawable.ViewerCanvas;
  28
  29 public class GraphvizComponent2 extends Composite {
  30
  31     Canvas canvas;
  32     GraphDrawable2 drawable;
  33     Graph graph;
  34     AtomicBoolean initialized = new AtomicBoolean(false);
  35     Frame frame;
  36
  37     public GraphvizComponent2(Composite parent, int style) {
  38         super(parent, style | SWT.EMBEDDED | SWT.NO_BACKGROUND);
  39
  40         frame = SWT_AWT.new_Frame(this);
  41
  42         SwingUtilities.invokeLater(new Runnable() {
  43
  44             @Override
  45             public void run() {
  46                 try {
  47                     drawable = new GraphDrawable2();
  48                     canvas = new ViewerCanvas(drawable);
  49                     frame.add(canvas);
  50                 } finally {
  51                     synchronized (initialized) {
  52                         initialized.set(true);
  53                         initialized.notifyAll();
  54                     }
  55                 }
  56             }
  57
  58         });
  59     }
  60
  61     public void waitUntilInitialized() {
  62         try {
  63             synchronized (initialized) {
  64                 while (!initialized.get())
  65                     initialized.wait();
  66             }
  67         } catch (InterruptedException e) {
  68             throw new Error("GraphvizComponent AWT population interrupted for class " + this, e); //$NON-NLS-1$
  69         }
  70     }
  71
  72     /**
  73      * Sets a new graph to be drawn. This operation may take a while. It can
  74      * be called from any thread. Automatically redraws the component.
  75      * @param graph
  76      */
  77     public Computation<Graph> setGraph(Graph graph) {
  78         return setGraph(graph, "dot"); //$NON-NLS-1$
  79     }
  80
  81     /**
  82      * Sets a new graph to be drawn. This operation may take a while. It can
  83      * be called from any thread. Automatically redraws the component.
  84      * @param graph
  85      */
  86     public Computation<Graph> setGraph(Graph graph, String algorithm) {
  87         Computation<Graph> computation = drawable.setGraph(graph, algorithm);
  88         computation.addContinuation(new Continuation<Graph>() {
  89
  90             @Override
  91             public void succeeded(Graph result) {
  92                 if (isDisposed())
  93                     return;
  94
  95                 fit();
  96             }
  97
  98             @Override
  99             public void failed(Exception exception) {
 100             }
 101         });
 102         return computation;
 103     }
 104
 105     /**
 106      * Fits the content of the canvas to the component.
 107      * Can be called from any thread.
 108      */
 109     public void fit() {
 110         ((ViewerCanvas)canvas).fit();
 111         getDisplay().asyncExec(new Runnable() {
 112
 113             @Override
 114             public void run() {
 115                 redraw();
 116             }
 117
 118         });
 119         SwingUtilities.invokeLater(new Runnable() {
 120
 121             @Override
 122             public void run() {
 123                 canvas.repaint();
 124             }
 125
 126         });
 127
 128
 129     }
 130
 131     public void requestFocus() {
 132         if(canvas != null)
 133             canvas.requestFocus();
 134     }
 135
 136     public Frame getFrame() {
 137         return frame;
 138     }
 139
 140     public Canvas getCanvas() {
 141         return canvas;
 142     }
 143
 144     public GraphDrawable2 getDrawable() {
 145         return drawable;
 146     }
 147
 148 }