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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/ShortestPathConnectionRouter.d @ 104:88652073d1c2

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More work on icu
author Frank Benoit <benoit@tionex.de>
date Sat, 02 May 2009 11:27:24 +0200
parents dbfb303e8fb0
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.draw2d.ShortestPathConnectionRouter;
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14
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15 import java.lang.all;
16
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16 import java.util.Collections;
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17 import java.util.HashSet;
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18 import java.util.HashMap;
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19 import java.util.Set;
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20 import java.util.Iterator;
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21 import java.util.List;
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22 import java.util.Map;
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23
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24 import org.eclipse.draw2d.geometry.Point;
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25 import org.eclipse.draw2d.geometry.PointList;
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26 import org.eclipse.draw2d.geometry.PrecisionPoint;
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27 import org.eclipse.draw2d.geometry.Rectangle;
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28 import org.eclipse.draw2d.graph.Path;
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29 import org.eclipse.draw2d.graph.ShortestPathRouter;
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30 import org.eclipse.draw2d.AbstractRouter;
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31 import org.eclipse.draw2d.IFigure;
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32 import org.eclipse.draw2d.LayoutListener;
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33 import org.eclipse.draw2d.FigureListener;
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34 import org.eclipse.draw2d.Connection;
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35 import org.eclipse.draw2d.Bendpoint;
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36
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37 /**
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38 * Routes multiple connections around the children of a given container figure.
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39 * @author Whitney Sorenson
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40 * @author Randy Hudson
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41 * @since 3.1
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42 */
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43 public final class ShortestPathConnectionRouter
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44 : AbstractRouter
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45 {
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46
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47 private class LayoutTracker : LayoutListenerStub {
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48 public void postLayout(IFigure container) {
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49 processLayout();
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50 }
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51 public void remove(IFigure child) {
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52 removeChild(child);
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53 }
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54 public void setConstraint(IFigure child, Object constraint) {
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55 addChild(child);
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56 }
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57 }
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58
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59 private Map constraintMap;
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60 private Map figuresToBounds;
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61 private Map connectionToPaths;
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62 private bool isDirty;
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63 private ShortestPathRouter algorithm;
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64 private IFigure container;
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65 private Set staleConnections;
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66 private LayoutListener listener;
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67
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68 private FigureListener figureListener;
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69 private void initFigureListener(){
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70 figureListener = new class() FigureListener {
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71 public void figureMoved(IFigure source) {
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72 Rectangle newBounds = source.getBounds().getCopy();
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73 if (algorithm.updateObstacle(cast(Rectangle)figuresToBounds.get(cast(Object)source), newBounds)) {
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74 queueSomeRouting();
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75 isDirty = true;
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76 }
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77
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78 figuresToBounds.put(cast(Object)source, newBounds);
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79 }
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80 };
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81 }
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82 private bool ignoreInvalidate;
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83
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84 /**
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85 * Creates a new shortest path router with the given container. The container
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86 * contains all the figure's which will be treated as obstacles for the connections to
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87 * avoid. Any time a child of the container moves, one or more connections will be
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88 * revalidated to process the new obstacle locations. The connections being routed must
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89 * not be contained within the container.
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90 *
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91 * @param container the container
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92 */
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93 public this(IFigure container) {
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94 initFigureListener();
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95 constraintMap = new HashMap();
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96 algorithm = new ShortestPathRouter();
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97 staleConnections = new HashSet();
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98 listener = new LayoutTracker();
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99 isDirty = false;
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100 algorithm = new ShortestPathRouter();
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101 this.container = container;
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102 }
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103
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104 void addChild(IFigure child) {
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105 if (connectionToPaths is null)
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106 return;
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107 if (figuresToBounds.containsKey(cast(Object)child))
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108 return;
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109 Rectangle bounds = child.getBounds().getCopy();
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110 algorithm.addObstacle(bounds);
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111 figuresToBounds.put(cast(Object)child, bounds);
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112 child.addFigureListener(figureListener);
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113 isDirty = true;
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114 }
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115
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116 private void hookAll() {
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117 figuresToBounds = new HashMap();
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118 for (int i = 0; i < container.getChildren().size(); i++)
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119 addChild(cast(IFigure)container.getChildren().get(i));
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120 container.addLayoutListener(listener);
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121 }
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122
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123 private void unhookAll() {
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124 container.removeLayoutListener(listener);
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125 if (figuresToBounds !is null) {
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126 Iterator figureItr = figuresToBounds.keySet().iterator();
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127 while (figureItr.hasNext()) {
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128 //Must use iterator's remove to avoid concurrent modification
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129 IFigure child = cast(IFigure)figureItr.next();
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130 figureItr.remove();
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131 removeChild(child);
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132 }
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133 figuresToBounds = null;
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134 }
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135 }
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136
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137 /**
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138 * Gets the constraint for the given {@link Connection}. The constraint is the paths
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139 * list of bend points for this connection.
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140 *
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141 * @param connection The connection whose constraint we are retrieving
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142 * @return The constraint
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143 */
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144 public Object getConstraint(Connection connection) {
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145 return constraintMap.get(cast(Object)connection);
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146 }
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147
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148 /**
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149 * Returns the default spacing maintained on either side of a connection. The default
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150 * value is 4.
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151 * @return the connection spacing
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152 * @since 3.2
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153 */
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154 public int getSpacing() {
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155 return algorithm.getSpacing();
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156 }
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157
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158 /**
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159 * @see ConnectionRouter#invalidate(Connection)
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160 */
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161 public void invalidate(Connection connection) {
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162 if (ignoreInvalidate)
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163 return;
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164 staleConnections.add(cast(Object)connection);
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165 isDirty = true;
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166 }
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167
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168 private void processLayout() {
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169 if (staleConnections.isEmpty())
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170 return;
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171 (cast(Connection)staleConnections.iterator().next()).revalidate();
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172 }
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173
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174 private void processStaleConnections() {
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175 Iterator iter = staleConnections.iterator();
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176 if (iter.hasNext() && connectionToPaths is null) {
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177 connectionToPaths = new HashMap();
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178 hookAll();
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179 }
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180
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181 while (iter.hasNext()) {
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182 Connection conn = cast(Connection)iter.next();
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183
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184 Path path = cast(Path)connectionToPaths.get(cast(Object)conn);
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185 if (path is null) {
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186 path = new Path(cast(Object)conn);
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187 connectionToPaths.put(cast(Object)conn, path);
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188 algorithm.addPath(path);
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189 }
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190
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191 List constraint = cast(List)getConstraint(conn);
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192 if (constraint is null)
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193 constraint = Collections.EMPTY_LIST;
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194
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195 Point start = conn.getSourceAnchor().getReferencePoint().getCopy();
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196 Point end = conn.getTargetAnchor().getReferencePoint().getCopy();
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197
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198 container.translateToRelative(start);
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199 container.translateToRelative(end);
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200
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201 path.setStartPoint(start);
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202 path.setEndPoint(end);
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203
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204 if (!constraint.isEmpty()) {
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205 PointList bends = new PointList(constraint.size());
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206 for (int i = 0; i < constraint.size(); i++) {
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207 Bendpoint bp = cast(Bendpoint)constraint.get(i);
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208 bends.addPoint(bp.getLocation());
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209 }
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210 path.setBendPoints(bends);
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211 } else
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212 path.setBendPoints(null);
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213
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214 isDirty |= path.isDirty;
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215 }
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216 staleConnections.clear();
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217 }
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218
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219 void queueSomeRouting() {
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220 if (connectionToPaths is null || connectionToPaths.isEmpty())
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221 return;
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222 try {
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223 ignoreInvalidate = true;
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224 (cast(Connection)connectionToPaths.keySet().iterator().next())
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225 .revalidate();
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226 } finally {
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227 ignoreInvalidate = false;
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228 }
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229 }
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230
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231 /**
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232 * @see ConnectionRouter#remove(Connection)
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233 */
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234 public void remove(Connection connection) {
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235 staleConnections.remove(cast(Object)connection);
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236 constraintMap.remove(cast(Object)connection);
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237 if (connectionToPaths is null)
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238 return;
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239 Path path = cast(Path)connectionToPaths.remove(cast(Object)connection);
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240 algorithm.removePath(path);
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241 isDirty = true;
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242 if (connectionToPaths.isEmpty()) {
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243 unhookAll();
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244 connectionToPaths = null;
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245 } else {
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246 //Make sure one of the remaining is revalidated so that we can re-route again.
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247 queueSomeRouting();
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248 }
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249 }
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250
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251 void removeChild(IFigure child) {
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252 if (connectionToPaths is null)
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253 return;
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254 Rectangle bounds = child.getBounds().getCopy();
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255 bool change = algorithm.removeObstacle(bounds);
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256 figuresToBounds.remove(cast(Object)child);
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257 child.removeFigureListener(figureListener);
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258 if (change) {
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259 isDirty = true;
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260 queueSomeRouting();
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261 }
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262 }
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263
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264 /**
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265 * @see ConnectionRouter#route(Connection)
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266 */
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267 public void route(Connection conn) {
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268 if (isDirty) {
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269 ignoreInvalidate = true;
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270 processStaleConnections();
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271 isDirty = false;
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272 List updated = algorithm.solve();
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273 Connection current;
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274 for (int i = 0; i < updated.size(); i++) {
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275 Path path = cast(Path) updated.get(i);
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276 current = cast(Connection)path.data;
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277 current.revalidate();
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278
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279 PointList points = path.getPoints().getCopy();
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diff changeset
280 Point ref1, ref2, start, end;
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281 ref1 = new PrecisionPoint(points.getPoint(1));
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282 ref2 = new PrecisionPoint(points.getPoint(points.size() - 2));
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diff changeset
283 current.translateToAbsolute(ref1);
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diff changeset
284 current.translateToAbsolute(ref2);
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285
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286 start = current.getSourceAnchor().getLocation(ref1).getCopy();
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287 end = current.getTargetAnchor().getLocation(ref2).getCopy();
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288
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289 current.translateToRelative(start);
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290 current.translateToRelative(end);
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diff changeset
291 points.setPoint(start, 0);
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diff changeset
292 points.setPoint(end, points.size() - 1);
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diff changeset
293
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diff changeset
294 current.setPoints(points);
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295 }
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296 ignoreInvalidate = false;
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297 }
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298 }
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299
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300 /**
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301 * @see ConnectionRouter#setConstraint(Connection, Object)
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302 */
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303 public void setConstraint(Connection connection, Object constraint) {
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304 //Connection.setConstraint() already calls revalidate, so we know that a
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305 // route() call will follow.
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306 staleConnections.add(cast(Object)connection);
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307 constraintMap.put(cast(Object)connection, constraint);
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308 isDirty = true;
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309 }
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310
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311 /**
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312 * Sets the default space that should be maintained on either side of a connection. This
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313 * causes the connections to be separated from each other and from the obstacles. The
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314 * default value is 4.
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315 *
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316 * @param spacing the connection spacing
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317 * @since 3.2
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318 */
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319 public void setSpacing(int spacing) {
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320 algorithm.setSpacing(spacing);
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321 }
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322
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323 }