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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/ConnectionLocator.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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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.ConnectionLocator;
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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.Dimension;
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18 import org.eclipse.draw2d.geometry.Point;
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19 import org.eclipse.draw2d.geometry.PointList;
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20 import org.eclipse.draw2d.AbstractLocator;
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21 import org.eclipse.draw2d.Connection;
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22
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23 /**
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24 * Repositions a {@link Figure} attached to a {@link Connection} when the Connection is
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25 * moved. Provides for alignment at the start (source), middle, or end (target) of the
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26 * Connection.
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27 */
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28 public class ConnectionLocator
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29 : AbstractLocator
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30 {
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31
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32 /** @deprecated Use {@link #SOURCE} */
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33 public static const int START = 2;
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34 /** The start (or source) of the Connection */
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35 public static const int SOURCE = 2;
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36
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37 /** @deprecated Use {@link #TARGET} */
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38 public static const int END = 3;
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39 /** The end (or target) of the Connection */
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40 public static const int TARGET = 3;
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41
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42 /**
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43 * @deprecated Use {@link #MIDDLE} instead, since the location is not the midpoint of a
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44 * line-segment, but the middle of a polyline.
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45 */
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46 public static const int MIDPOINT = 4;
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47 /** The middle of the Connection */
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48 public static const int MIDDLE = 4;
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49
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50 private Connection connection;
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51 private int alignment;
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52
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53 /**
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54 * Constructs a ConnectionLocator with the passed connection and {@link #MIDDLE}
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55 * alignment.
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56 *
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57 * @param connection The Connection
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58 * @since 2.0
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59 */
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60 public this(Connection connection) {
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61 this(connection, MIDDLE);
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62 }
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63
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64 /**
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65 * Constructs a ConnectionLocator with the passed Connection and alignment. Valid values
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66 * for the alignment are integer constants {@link #SOURCE}, {@link #MIDDLE}, and
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67 * {@link #TARGET}.
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68 *
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69 * @param connection The Connection
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70 * @param align The alignment
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71 *
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72 * @since 2.0
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73 */
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74 public this(Connection connection, int align_) {
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75 setConnection(connection);
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76 setAlignment(align_);
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77 }
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78
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79 /**
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80 * Returns the alignment of ConnectionLocator.
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81 *
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82 * @return The alignment
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83 * @since 2.0
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84 */
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85 public int getAlignment() {
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86 return alignment;
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87 }
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88
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89 /**
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90 * Returns connection associated with ConnectionLocator.
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91 *
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92 * @return The Connection
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93 * @since 2.0
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94 */
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95 protected Connection getConnection() {
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96 return connection;
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97 }
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98
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99 /**
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100 * Returns ConnectionLocator's reference point in absolute coordinates.
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101 *
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102 * @return The reference point
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103 * @since 2.0
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104 */
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105 protected Point getReferencePoint() {
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106 Point p = getLocation(getConnection().getPoints());
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107 getConnection().translateToAbsolute(p);
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108 return p;
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109 }
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110
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111 /**
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112 * Returns a point from the passed PointList, dependent on ConnectionLocator's alignment.
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113 * If the alignment is {@link #SOURCE}, it returns the first point in <i>points</i>. If
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114 * {@link #TARGET}, it returns the last point in <i>points</i>. If {@link #MIDDLE}, it
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115 * returns the middle of line represented by <i>points</i>.
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116 *
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117 * @param points The points in the Connection
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118 * @return The location
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119 * @since 2.0
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120 */
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121 protected Point getLocation(PointList points) {
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122 switch (getAlignment()) {
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123 case SOURCE:
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124 return points.getPoint(Point.SINGLETON, 0);
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125 case TARGET:
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126 return points.getPoint(Point.SINGLETON, points.size() - 1);
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127 case MIDDLE:
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128 if (points.size() % 2 is 0) {
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129 int i = points.size() / 2;
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130 int j = i - 1;
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131 Point p1 = points.getPoint(j);
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132 Point p2 = points.getPoint(i);
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133 Dimension d = p2.getDifference(p1);
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134 return Point.SINGLETON.setLocation(p1.x + d.width / 2,
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135 p1.y + d.height / 2);
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136 }
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137 int i = (points.size() - 1) / 2;
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138 return points.getPoint(Point.SINGLETON, i);
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139 default:
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140 return new Point();
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141 }
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142 }
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143
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144 /**
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145 * Sets the alignment. Possible values are {@link #SOURCE}, {@link #MIDDLE}, and
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146 * {@link #TARGET}.
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147 *
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148 * @param align The alignment
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149 * @since 2.0
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150 */
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151 protected void setAlignment(int align_) {
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152 alignment = align_;
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153 }
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154
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155 /**
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156 * Sets the Connection to be associated with this ConnectionLocator.
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157 *
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158 * @param connection The Connection
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159 * @since 2.0
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160 */
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161 protected void setConnection(Connection connection) {
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162 this.connection = connection;
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163 }
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164
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165 }