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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/AutomaticRouter.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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children dbfb303e8fb0
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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.AutomaticRouter;
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14
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15 import java.lang.all;
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16
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17 import org.eclipse.draw2d.geometry.Point;
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18 import org.eclipse.draw2d.geometry.PointList;
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19 import org.eclipse.draw2d.internal.MultiValueMap;
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20 import org.eclipse.draw2d.AbstractRouter;
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21 import org.eclipse.draw2d.ConnectionRouter;
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22 import org.eclipse.draw2d.ConnectionAnchor;
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23 import org.eclipse.draw2d.Connection;
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24
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25 /**
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26 * An abstract router implementation which detects when multiple connections are
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27 * overlapping. Two connections overlap if the combination of source and target
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28 * anchors are equal. Subclasses must implement {@link #handleCollision(PointList, int)}
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29 * to determine how to avoid the overlap.
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30 * <p>
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31 * This router can delegate to another connection router. The wrappered router will route
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32 * the connections first, after which overlapping will be determined.
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33 */
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34 public abstract class AutomaticRouter
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35 : AbstractRouter
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36 {
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37
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38 private ConnectionRouter nextRouter;
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39 private MultiValueMap connections;
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40
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41 public this(){
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42 connections = new MultiValueMap();
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43 }
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44
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45 private class HashKey {
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46
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47 private ConnectionAnchor anchor1, anchor2;
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48
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49 this(Connection conn) {
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50 anchor1 = conn.getSourceAnchor();
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51 anchor2 = conn.getTargetAnchor();
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52 }
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53
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54 public override int opEquals(Object object) {
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55 bool isEqual = false;
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56 HashKey hashKey;
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57
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58 if (auto hashKey = cast(HashKey)object ) {
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59 ConnectionAnchor hkA1 = hashKey.getFirstAnchor();
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60 ConnectionAnchor hkA2 = hashKey.getSecondAnchor();
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61
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62 isEqual = ((cast(Object)hkA1).opEquals(cast(Object)anchor1) && (cast(Object)hkA2).opEquals(cast(Object)anchor2))
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63 || ((cast(Object)hkA1).opEquals(cast(Object)anchor2) && (cast(Object)hkA2).opEquals(cast(Object)anchor1));
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64 }
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65 return isEqual;
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66 }
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67
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68 public ConnectionAnchor getFirstAnchor() {
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69 return anchor1;
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70 }
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71
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72 public ConnectionAnchor getSecondAnchor() {
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73 return anchor2;
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74 }
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75
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76 public override hash_t toHash() {
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77 return (cast(Object)anchor1).toHash() ^ (cast(Object)anchor2).toHash();
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78 }
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79 }
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80
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81 /**
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82 * @see org.eclipse.draw2d.ConnectionRouter#getConstraint(Connection)
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83 */
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84 public Object getConstraint(Connection connection) {
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85 if (next() !is null)
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86 return next().getConstraint(connection);
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87 return null;
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88 }
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89
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90 /**
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91 * Handles collisions between 2 or more Connections. Collisions are currently defined as 2
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92 * connections with no bendpoints and whose start and end points coincide. In other
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93 * words, the 2 connections are the exact same line.
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94 *
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95 * @param list The PointList of a connection that collides with another connection
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96 * @param index The index of the current connection in the list of colliding connections
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97 */
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98 protected abstract void handleCollision(PointList list, int index);
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99
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100 /**
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101 * @see org.eclipse.draw2d.ConnectionRouter#invalidate(Connection)
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102 */
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103 public void invalidate(Connection conn) {
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104 if (next() !is null)
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105 next().invalidate(conn);
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106 if (conn.getSourceAnchor() is null || conn.getTargetAnchor() is null)
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107 return;
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108 HashKey connectionKey = new HashKey(conn);
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109 ArrayList connectionList = connections.get(connectionKey);
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110 int affected = connections.remove(connectionKey, cast(Object)conn);
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111 if (affected !is -1) {
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112 for (int i = affected; i < connectionList.size(); i++)
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113 (cast(Connection)connectionList.get(i)).revalidate();
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114 } else
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115 connections.removeValue(cast(Object)conn);
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116
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117 }
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118
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119 /**
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120 * Returns the next router in the chain.
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121 * @return The next router
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122 * @since 2.0
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123 */
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124 protected ConnectionRouter next() {
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125 return nextRouter;
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126 }
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127
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128
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129
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130 /**
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131 * @see org.eclipse.draw2d.ConnectionRouter#remove(Connection)
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132 */
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133 public void remove(Connection conn) {
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134 if (conn.getSourceAnchor() is null || conn.getTargetAnchor() is null)
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135 return;
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136 HashKey connectionKey = new HashKey(conn);
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137 ArrayList connectionList = connections.get(connectionKey);
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138 if (connectionList !is null) {
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139 int index = connections.remove(connectionKey,cast(Object) conn);
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140 for (int i = index + 1; i < connectionList.size(); i++)
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141 (cast(Connection)connectionList.get(i)).revalidate();
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142 }
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143 if (next() !is null)
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144 next().remove(conn);
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145 }
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146
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147 /**
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148 * Routes the given connection. Calls the 'next' router first (if one exists) and if no
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149 * bendpoints were added by the next router, collisions are dealt with by calling
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150 * {@link #handleCollision(PointList, int)}.
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151 * @param conn The connection to route
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152 */
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153 public void route(Connection conn) {
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154 if (next() !is null)
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155 next().route(conn);
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156 else {
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157 conn.getPoints().removeAllPoints();
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158 setEndPoints(conn);
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159 }
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160
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161 if (conn.getPoints().size() is 2) {
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162 PointList points = conn.getPoints();
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163 HashKey connectionKey = new HashKey(conn);
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164 ArrayList connectionList = connections.get(connectionKey);
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165
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166 if (connectionList !is null) {
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167
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168 int index;
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169
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170 if (connectionList.contains(cast(Object)conn)) {
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171 index = connectionList.indexOf(cast(Object)conn) + 1;
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172 } else {
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173 index = connectionList.size() + 1;
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174 connections.put(connectionKey, cast(Object)conn);
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175 }
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176
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177 handleCollision(points, index);
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178 conn.setPoints(points);
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179 } else {
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180 connections.put(connectionKey, cast(Object)conn);
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181 }
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182 }
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183 }
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184
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185 /**
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186 * An AutomaticRouter needs no constraints for the connections it routes. This method
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187 * invalidates the connections and calls {@link #setConstraint(Connection, Object)} on the
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188 * {@link #next()} router.
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189 * @see org.eclipse.draw2d.ConnectionRouter#setConstraint(Connection, Object)
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190 */
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191 public void setConstraint(Connection connection, Object constraint) {
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192 invalidate(connection);
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193 if (next() !is null)
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194 next().setConstraint(connection, constraint);
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195 }
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196
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197 /**
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198 * Sets the start and end points for the given connection.
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199 * @param conn The connection
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200 */
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201 protected void setEndPoints(Connection conn) {
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202 PointList points = conn.getPoints();
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203 points.removeAllPoints();
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204 Point start = getStartPoint(conn);
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205 Point end = getEndPoint(conn);
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206 conn.translateToRelative(start);
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207 conn.translateToRelative(end);
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208 points.addPoint(start);
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209 points.addPoint(end);
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210 conn.setPoints(points);
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211 }
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212
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213 /**
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214 * Sets the next router.
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215 * @param router The ConnectionRouter
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216 * @since 2.0
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217 */
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218 public void setNextRouter(ConnectionRouter router) {
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219 nextRouter = router;
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220 }
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221
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222 }