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annotate dwt/widgets/EventTable.d @ 15:2952d5604c0a

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Ported some widgets, added some stuff to the runtime bindings
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Fri, 29 Aug 2008 21:46:05 +0200
parents 380af2bdd8e5
children 5b53d338c709
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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 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.widgets.EventTable;
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16
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17 import dwt.DWT;
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18 import dwt.internal.DWTEventListener;
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19
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20 import dwt.dwthelper.System;
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21 import dwt.dwthelper.utils;
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23 import dwt.widgets.Event;
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24 import dwt.widgets.Listener;
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25 import dwt.widgets.TypedListener;
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26
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27 /**
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28 * Instances of this class implement a simple
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29 * look up mechanism that maps an event type
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30 * to a listener. Multiple listeners for the
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31 * same event type are supported.
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32 */
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33
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34 class EventTable {
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35 int [] types;
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36 Listener [] listeners;
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37 int level;
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38 static const int GROW_SIZE = 4;
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39
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40 public Listener [] getListeners (int eventType) {
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41 if (types is null) return new Listener [0];
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42 int count = 0;
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43 for (int i=0; i<types.length; i++) {
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44 if (types [i] is eventType) count++;
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45 }
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46 if (count is 0) return new Listener [0];
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47 Listener [] result = new Listener [count];
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48 count = 0;
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49 for (int i=0; i<types.length; i++) {
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50 if (types [i] is eventType) {
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51 result [count++] = listeners [i];
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52 }
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53 }
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54 return result;
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55 }
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56
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57 public void hook (int eventType, Listener listener) {
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58 if (types is null) types = new int [GROW_SIZE];
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59 if (listeners is null) listeners = new Listener [GROW_SIZE];
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60 int length = types.length, index = length - 1;
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61 while (index >= 0) {
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62 if (types [index] !is 0) break;
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63 --index;
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64 }
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65 index++;
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66 if (index is length) {
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67 int [] newTypes = new int [length + GROW_SIZE];
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68 System.arraycopy (types, 0, newTypes, 0, length);
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69 types = newTypes;
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70 Listener [] newListeners = new Listener [length + GROW_SIZE];
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71 SimpleType!(Listener).arraycopy (listeners, 0, newListeners, 0, length);
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72 listeners = newListeners;
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73 }
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74 types [index] = eventType;
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75 listeners [index] = listener;
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76 }
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77
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78 public bool hooks (int eventType) {
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79 if (types is null) return false;
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80 for (int i=0; i<types.length; i++) {
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81 if (types [i] is eventType) return true;
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82 }
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83 return false;
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84 }
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85
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86 public void sendEvent (Event event) {
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87 if (types is null) return;
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88 level += level >= 0 ? 1 : -1;
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89 try {
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90 for (int i=0; i<types.length; i++) {
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91 if (event.type is DWT.None) return;
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92 if (types [i] is event.type) {
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93 Listener listener = listeners [i];
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94 if (listener !is null) listener.handleEvent (event);
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95 }
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96 }
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97 } finally {
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98 bool compact = level < 0;
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99 level -= level >= 0 ? 1 : -1;
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100 if (compact && level is 0) {
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101 int index = 0;
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102 for (int i=0; i<types.length; i++) {
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103 if (types [i] !is 0) {
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104 types [index] = types [i];
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105 listeners [index] = listeners [i];
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106 index++;
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107 }
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108 }
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109 for (int i=index; i<types.length; i++) {
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110 types [i] = 0;
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111 listeners [i] = null;
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112 }
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113 }
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114 }
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115 }
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116
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117 public int size () {
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118 if (types is null) return 0;
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119 int count = 0;
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120 for (int i=0; i<types.length; i++) {
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121 if (types [i] !is 0) count++;
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122 }
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123 return count;
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124 }
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125
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126 void remove (int index) {
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127 if (level is 0) {
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128 int end = types.length - 1;
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129 System.arraycopy (types, index + 1, types, index, end - index);
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130 SimpleType!(Listener).arraycopy (listeners, index + 1, listeners, index, end - index);
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131 index = end;
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132 } else {
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133 if (level > 0) level = -level;
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134 }
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135 types [index] = 0;
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136 listeners [index] = null;
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137 }
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138
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139 public void unhook (int eventType, Listener listener) {
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140 if (types is null) return;
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141 for (int i=0; i<types.length; i++) {
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142 if (types [i] is eventType && listeners [i] is listener) {
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143 remove (i);
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144 return;
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145 }
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146 }
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147 }
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148
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149 public void unhook (int eventType, DWTEventListener listener) {
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150 if (types is null) return;
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151 for (int i=0; i<types.length; i++) {
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152 if (types [i] is eventType) {
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153 if (cast(TypedListener) listeners [i]) {
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154 TypedListener typedListener = cast(TypedListener) listeners [i];
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155 if (typedListener.getEventListener () is listener) {
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156 remove (i);
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157 return;
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158 }
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159 }
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160 }
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161 }
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162 }
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163
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164 }