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annotate dwt/widgets/EventTable.d @ 213:36f5cb12e1a2

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Update to SWT 3.4M7
author Frank Benoit <benoit@tionex.de>
date Sat, 17 May 2008 17:34:28 +0200
parents 92c102dd64a3
children fd9c62a2998e
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31
92c102dd64a3 Added all widgets modules as dummy. Most modules of accessible are equal to the linux version, except Accessible.
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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 dwt.widgets.EventTable;
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14
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15 import dwt.widgets.Listener;
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16 import dwt.widgets.Event;
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17 import dwt.widgets.Listener;
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18 import dwt.widgets.TypedListener;
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19 import dwt.internal.DWTEventListener;
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20 import dwt.dwthelper.System;
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21 import dwt.DWT;
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22 import dwt.internal.DWTEventListener;
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23
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24 /**
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25 * Instances of this class implement a simple
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26 * look up mechanism that maps an event type
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27 * to a listener. Multiple listeners for the
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28 * same event type are supported.
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29 */
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30
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31 class EventTable {
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32 int [] types;
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33 Listener [] listeners;
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34 int level;
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35 static final int GROW_SIZE = 4;
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36
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37 public Listener [] getListeners (int eventType) {
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38 if (types is null) return new Listener [0];
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39 int count = 0;
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40 for (int i=0; i<types.length; i++) {
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41 if (types [i] is eventType) count++;
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42 }
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43 if (count is 0) return new Listener [0];
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44 Listener [] result = new Listener [count];
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45 count = 0;
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46 for (int i=0; i<types.length; i++) {
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47 if (types [i] is eventType) {
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48 result [count++] = listeners [i];
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49 }
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50 }
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51 return result;
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52 }
31
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53
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54 public void hook (int eventType, Listener listener) {
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55 if (types is null) types = new int [GROW_SIZE];
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56 if (listeners is null) listeners = new Listener [GROW_SIZE];
31
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57 int length = types.length, index = length - 1;
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58 while (index >= 0) {
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59 if (types [index] !is 0) break;
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60 --index;
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61 }
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62 index++;
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63 if (index is length) {
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64 int [] newTypes = new int [length + GROW_SIZE];
31
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65 System.arraycopy (types, 0, newTypes, 0, length);
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66 types = newTypes;
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67 Listener [] newListeners = new Listener [length + GROW_SIZE];
31
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68 SimpleType!(Listener).arraycopy (listeners, 0, newListeners, 0, length);
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69 listeners = newListeners;
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70 }
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71 types [index] = eventType;
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72 listeners [index] = listener;
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73 }
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74
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75 public bool hooks (int eventType) {
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76 if (types is null) return false;
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77 for (int i=0; i<types.length; i++) {
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78 if (types [i] is eventType) return true;
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79 }
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80 return false;
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81 }
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82
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83 public void sendEvent (Event event) {
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84 if (types is null) return;
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85 level += level >= 0 ? 1 : -1;
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86 try {
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87 for (int i=0; i<types.length; i++) {
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88 if (event.type is DWT.None) return;
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89 if (types [i] is event.type) {
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90 Listener listener = listeners [i];
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91 if (listener !is null) listener.handleEvent (event);
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92 }
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93 }
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94 } finally {
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95 bool compact = level < 0;
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96 level -= level >= 0 ? 1 : -1;
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97 if (compact && level is 0) {
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98 int index = 0;
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99 for (int i=0; i<types.length; i++) {
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100 if (types [i] !is 0) {
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101 types [index] = types [i];
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102 listeners [index] = listeners [i];
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103 index++;
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104 }
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105 }
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106 for (int i=index; i<types.length; i++) {
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107 types [i] = 0;
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108 listeners [i] = null;
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109 }
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110 }
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111 }
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112 }
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113
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114 public int size () {
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115 if (types is null) return 0;
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116 int count = 0;
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117 for (int i=0; i<types.length; i++) {
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118 if (types [i] !is 0) count++;
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119 }
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120 return count;
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121 }
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122
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123 void remove (int index) {
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124 if (level is 0) {
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125 int end = types.length - 1;
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126 System.arraycopy (types, index + 1, types, index, end - index);
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127 SimpleType!(Listener).arraycopy (listeners, index + 1, listeners, index, end - index);
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128 index = end;
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129 } else {
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130 if (level > 0) level = -level;
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131 }
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132 types [index] = 0;
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133 listeners [index] = null;
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134 }
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135
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136 public void unhook (int eventType, Listener listener) {
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137 if (types is null) return;
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138 for (int i=0; i<types.length; i++) {
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139 if (types [i] is eventType && listeners [i] is listener) {
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140 remove (i);
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141 return;
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142 }
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143 }
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144 }
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145
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146 public void unhook (int eventType, DWTEventListener listener) {
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147 if (types is null) return;
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148 for (int i=0; i<types.length; i++) {
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149 if (types [i] is eventType) {
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150 if ( auto typedListener = cast(TypedListener) listeners [i] ) {
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151 if (typedListener.getEventListener () is listener) {
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152 remove (i);
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153 return;
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154 }
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155 }
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156 }
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157 }
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158 }
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159
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160 }