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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/AncestorHelper.d @ 16:dbfb303e8fb0

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first complete successful compile (win-only)
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 08:56:47 +0100
parents bc29606a740c
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.AncestorHelper;
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14
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15 import java.lang.all;
16
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16 import java.beans.PropertyChangeEvent;
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17 import java.beans.PropertyChangeListener;
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18
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19 import org.eclipse.draw2d.IFigure;
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20 import org.eclipse.draw2d.FigureListener;
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21 import org.eclipse.draw2d.AncestorListener;
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22
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23 /**
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24 * A helper object which tracks the parent chain hierarchy.
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25 * @since 2.1
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26 */
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27 class AncestorHelper
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28 : PropertyChangeListener, FigureListener
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29 {
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30
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31 /**
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32 * The base figure whose ancestor chain is being observed.
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33 */
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34 protected final IFigure base;
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35 /**
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36 * The array of ancestor listeners.
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37 */
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38 protected AncestorListener[] listeners;
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39
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40 /**
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41 * Constructs a new helper on the given base figure and starts listening to figure and
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42 * property changes on the base figure's parent chain. When no longer needed, the helper
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43 * should be disposed.
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44 * @since 2.1
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45 * @param baseFigure
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46 */
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47 public this(IFigure baseFigure) {
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48 this.base = baseFigure;
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49 addAncestors(baseFigure);
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50 }
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51
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52 /**
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53 * Appends a new listener to the list of listeners.
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54 * @param listener the listener
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55 */
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56 public void addAncestorListener(AncestorListener listener) {
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57 if (listeners is null) {
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58 listeners = new AncestorListener[1];
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59 listeners[0] = listener;
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60 } else {
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61 int oldSize = listeners.length;
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62 AncestorListener newListeners[] = new AncestorListener[oldSize + 1];
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63 SimpleType!(AncestorListener).arraycopy(listeners, 0, newListeners, 0, oldSize);
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64 newListeners[oldSize] = listener;
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65 listeners = newListeners;
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66 }
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67 }
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68
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69 /**
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70 * Hooks up internal listeners used for maintaining the proper figure listeners.
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71 * @param rootFigure the root figure
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72 */
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73 protected void addAncestors(IFigure rootFigure) {
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74 for (IFigure ancestor = rootFigure;
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75 ancestor !is null;
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76 ancestor = ancestor.getParent()) {
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77 ancestor.addFigureListener(this);
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78 ancestor.addPropertyChangeListener("parent", this); //$NON-NLS-1$
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79 }
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80 }
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81
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82 /**
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83 * Removes all internal listeners.
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84 */
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85 public void dispose() {
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86 removeAncestors(base);
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87 listeners = null;
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88 }
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89
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90 /**
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91 * @see org.eclipse.draw2d.FigureListener#figureMoved(org.eclipse.draw2d.IFigure)
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92 */
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93 public void figureMoved(IFigure ancestor) {
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94 fireAncestorMoved(ancestor);
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95 }
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96
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97 /**
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98 * Fires notification to the listener list
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99 * @param ancestor the figure which moved
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100 */
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101 protected void fireAncestorMoved(IFigure ancestor) {
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102 if (listeners is null)
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103 return;
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104 for (int i = 0; i < listeners.length; i++)
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105 listeners[i].ancestorMoved(ancestor);
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106 }
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107
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108 /**
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109 * Fires notification to the listener list
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110 * @param ancestor the figure which moved
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111 */
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112 protected void fireAncestorAdded(IFigure ancestor) {
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113 if (listeners is null)
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114 return;
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115 for (int i = 0; i < listeners.length; i++)
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116 listeners[i].ancestorAdded(ancestor);
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117 }
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118
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119 /**
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120 * Fires notification to the listener list
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121 * @param ancestor the figure which moved
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122 */
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123 protected void fireAncestorRemoved(IFigure ancestor) {
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124 if (listeners is null)
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125 return;
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126 for (int i = 0; i < listeners.length; i++)
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127 listeners[i].ancestorRemoved(ancestor);
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128 }
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129
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130 /**
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131 * Returns the total number of listeners.
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132 * @return the number of listeners
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133 */
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134 public bool isEmpty() {
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135 return listeners is null;
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136 }
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137
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138 /**
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139 * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
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140 */
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141 public void propertyChange(PropertyChangeEvent event) {
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142 if (event.getPropertyName().equals("parent")) { //$NON-NLS-1$
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143 IFigure oldParent = cast(IFigure)event.getOldValue();
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144 IFigure newParent = cast(IFigure)event.getNewValue();
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145 if (oldParent !is null) {
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146 removeAncestors(oldParent);
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147 fireAncestorRemoved(oldParent);
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148 }
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149 if (newParent !is null) {
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150 addAncestors(newParent);
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151 fireAncestorAdded(newParent);
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152 }
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153 }
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154 }
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155
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156 /**
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157 * Removes the first occurence of the given listener
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158 * @param listener the listener to remove
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159 */
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160 public void removeAncestorListener(AncestorListener listener) {
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161 if (listeners is null)
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162 return;
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163 for (int index = 0; index < listeners.length; index++)
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164 if (listeners[index] is listener) {
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165 int newSize = listeners.length - 1;
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166 AncestorListener newListeners[] = null;
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167 if (newSize !is 0) {
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168 newListeners = new AncestorListener[newSize];
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169 SimpleType!(AncestorListener).arraycopy(listeners, 0, newListeners, 0, index);
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170 SimpleType!(AncestorListener).arraycopy(listeners, index + 1, newListeners, index, newSize - index);
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171 }
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172 listeners = newListeners;
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173 return;
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174 }
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175 }
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176
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177 /**
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178 * Unhooks listeners starting at the given figure
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179 * @param rootFigure
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180 */
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181 protected void removeAncestors(IFigure rootFigure) {
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182 for (IFigure ancestor = rootFigure;
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183 ancestor !is null;
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184 ancestor = ancestor.getParent()) {
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185 ancestor.removeFigureListener(this);
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186 ancestor.removePropertyChangeListener("parent", this); //$NON-NLS-1$
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187 }
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188 }
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189
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190 }