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annotate dwtx/draw2d/AncestorHelper.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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 dwtx.draw2d.AncestorHelper;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Bean;
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17
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18 import dwtx.draw2d.IFigure;
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19 import dwtx.draw2d.FigureListener;
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20 import dwtx.draw2d.AncestorListener;
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21
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22 /**
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23 * A helper object which tracks the parent chain hierarchy.
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24 * @since 2.1
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25 */
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26 class AncestorHelper
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27 : PropertyChangeListener, FigureListener
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28 {
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29
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30 /**
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31 * The base figure whose ancestor chain is being observed.
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32 */
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33 protected final IFigure base;
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34 /**
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35 * The array of ancestor listeners.
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36 */
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37 protected AncestorListener[] listeners;
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38
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39 /**
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40 * Constructs a new helper on the given base figure and starts listening to figure and
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41 * property changes on the base figure's parent chain. When no longer needed, the helper
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42 * should be disposed.
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43 * @since 2.1
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44 * @param baseFigure
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45 */
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46 public this(IFigure baseFigure) {
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47 this.base = baseFigure;
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48 addAncestors(baseFigure);
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49 }
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50
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51 /**
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52 * Appends a new listener to the list of listeners.
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53 * @param listener the listener
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54 */
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55 public void addAncestorListener(AncestorListener listener) {
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56 if (listeners is null) {
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57 listeners = new AncestorListener[1];
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58 listeners[0] = listener;
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59 } else {
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60 int oldSize = listeners.length;
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61 AncestorListener newListeners[] = new AncestorListener[oldSize + 1];
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62 SimpleType!(AncestorListener).arraycopy(listeners, 0, newListeners, 0, oldSize);
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63 newListeners[oldSize] = listener;
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64 listeners = newListeners;
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65 }
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66 }
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67
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68 /**
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69 * Hooks up internal listeners used for maintaining the proper figure listeners.
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70 * @param rootFigure the root figure
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71 */
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72 protected void addAncestors(IFigure rootFigure) {
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73 for (IFigure ancestor = rootFigure;
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74 ancestor !is null;
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75 ancestor = ancestor.getParent()) {
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76 ancestor.addFigureListener(this);
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77 ancestor.addPropertyChangeListener("parent", this); //$NON-NLS-1$
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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 * Removes all internal listeners.
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83 */
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84 public void dispose() {
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85 removeAncestors(base);
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86 listeners = null;
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87 }
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88
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89 /**
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90 * @see dwtx.draw2d.FigureListener#figureMoved(dwtx.draw2d.IFigure)
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91 */
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92 public void figureMoved(IFigure ancestor) {
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93 fireAncestorMoved(ancestor);
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94 }
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95
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96 /**
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97 * Fires notification to the listener list
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98 * @param ancestor the figure which moved
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99 */
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100 protected void fireAncestorMoved(IFigure ancestor) {
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101 if (listeners is null)
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102 return;
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103 for (int i = 0; i < listeners.length; i++)
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104 listeners[i].ancestorMoved(ancestor);
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105 }
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106
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107 /**
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108 * Fires notification to the listener list
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109 * @param ancestor the figure which moved
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110 */
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111 protected void fireAncestorAdded(IFigure ancestor) {
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112 if (listeners is null)
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113 return;
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114 for (int i = 0; i < listeners.length; i++)
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115 listeners[i].ancestorAdded(ancestor);
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116 }
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117
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118 /**
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119 * Fires notification to the listener list
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120 * @param ancestor the figure which moved
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121 */
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122 protected void fireAncestorRemoved(IFigure ancestor) {
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123 if (listeners is null)
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124 return;
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125 for (int i = 0; i < listeners.length; i++)
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126 listeners[i].ancestorRemoved(ancestor);
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127 }
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128
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129 /**
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130 * Returns the total number of listeners.
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131 * @return the number of listeners
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132 */
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133 public bool isEmpty() {
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134 return listeners is null;
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135 }
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136
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137 /**
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138 * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
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139 */
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140 public void propertyChange(PropertyChangeEvent event) {
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141 if (event.getPropertyName().equals("parent")) { //$NON-NLS-1$
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142 IFigure oldParent = cast(IFigure)event.getOldValue();
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143 IFigure newParent = cast(IFigure)event.getNewValue();
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144 if (oldParent !is null) {
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145 removeAncestors(oldParent);
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146 fireAncestorRemoved(oldParent);
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147 }
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148 if (newParent !is null) {
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149 addAncestors(newParent);
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150 fireAncestorAdded(newParent);
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151 }
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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 * Removes the first occurence of the given listener
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157 * @param listener the listener to remove
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158 */
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159 public void removeAncestorListener(AncestorListener listener) {
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160 if (listeners is null)
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161 return;
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162 for (int index = 0; index < listeners.length; index++)
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163 if (listeners[index] is listener) {
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164 int newSize = listeners.length - 1;
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165 AncestorListener newListeners[] = null;
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166 if (newSize !is 0) {
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167 newListeners = new AncestorListener[newSize];
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168 SimpleType!(AncestorListener).arraycopy(listeners, 0, newListeners, 0, index);
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169 SimpleType!(AncestorListener).arraycopy(listeners, index + 1, newListeners, index, newSize - index);
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170 }
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171 listeners = newListeners;
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172 return;
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173 }
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174 }
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175
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176 /**
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177 * Unhooks listeners starting at the given figure
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178 * @param rootFigure
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179 */
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180 protected void removeAncestors(IFigure rootFigure) {
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181 for (IFigure ancestor = rootFigure;
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182 ancestor !is null;
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183 ancestor = ancestor.getParent()) {
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184 ancestor.removeFigureListener(this);
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185 ancestor.removePropertyChangeListener("parent", this); //$NON-NLS-1$
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186 }
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187 }
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188
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189 }