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annotate dwtx/draw2d/ButtonGroup.d @ 172:d994a8b2cdf7

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again compile fixes
author Frank Benoit <benoit@tionex.de>
date Wed, 10 Sep 2008 23:14:02 +0200
parents 95307ad235d9
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 dwtx.draw2d.ButtonGroup;
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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 import dwtx.dwtxhelper.Collection;
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18
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19 import dwtx.draw2d.ButtonModel;
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20
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21 /**
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22 * A ButtonGroup holds a group of {@link Clickable Clickable's} models and provides unique
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23 * selection in them. There is capability to add a default selection. Models who want to
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24 * belong to the group should just add themselves to this group. By doing so they listen
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25 * to this group for changes.
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26 * <p>
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27 * Setting of the default selection results in its being selected any time
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28 * {@link #setSelected(ButtonModel, bool)} is called. If no default selection is set,
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29 * the last entry selected is not allowed to deselect.
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30 */
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31 public class ButtonGroup {
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32
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33 private ButtonModel selectedModel;
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34 private ButtonModel defaultModel;
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35 private List members;
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36 private List listeners;
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37
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38 /**
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39 * Constructs a ButtonGroup with no default selection.
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40 *
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41 * @since 2.0
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42 */
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43 public this() {
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44 members = new ArrayList();
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45 listeners = new ArrayList();
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46 }
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47
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48 /**
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49 * Adds the passed ButtonModel to the ButtonGroup.
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50 *
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51 * @param model ButtonModel to be added to this group
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52 * @since 2.0
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53 */
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54 public void add(ButtonModel model) {
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55 if (!members.contains(model)) {
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56 model.setGroup(this);
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57 members.add(model);
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58 }
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59 }
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60
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61 /**
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62 * Adds the passed listener. ButtonGroups use PropertyChangeListeners to react to
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63 * selection changes in the ButtonGroup.
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64 *
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65 * @param listener Listener to be added to this group
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66 * @since 2.0
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67 */
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68 public void addPropertyChangeListener(PropertyChangeListener listener) {
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69 listeners.add(cast(Object)listener);
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70 }
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71
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72 /**
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73 * Fires a PropertyChangeEvent to all PropertyChangeListeners added to this ButtonGroup.
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74 *
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75 * @param oldValue Old selection value
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76 * @param newValue New selection value
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77 * @since 2.0
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78 */
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79 protected void firePropertyChange(Object oldValue, Object newValue) {
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80 PropertyChangeEvent event = new PropertyChangeEvent(
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81 this, ButtonModel.SELECTED_PROPERTY, oldValue, newValue);
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82 for (int i = 0; i < listeners.size(); i++)
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83 (cast(PropertyChangeListener)listeners.get(i)).propertyChange(event);
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84 }
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85
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86 /**
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87 * Returns the ButtonModel which is selected by default for this ButtonGroup.
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88 *
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89 * @return The default ButtonModel
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90 * @since 2.0
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91 */
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92 public ButtonModel getDefault() {
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93 return defaultModel;
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94 }
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95
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96 /**
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97 * Returns a List which contains all of the {@link ButtonModel ButtonModels} added to this
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98 * ButtonGroup.
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99 *
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100 * @return The List of ButtonModels in this ButtonGroup
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101 * @since 2.0
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102 */
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103 public List getElements() {
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104 return members;
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105 }
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106
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107 /**
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108 * Returns the ButtonModel for the currently selected button.
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109 *
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110 * @return The ButtonModel for the currently selected button
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111 * @since 2.0
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112 */
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113 public ButtonModel getSelected() {
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114 return selectedModel;
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115 }
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116
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117 /**
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118 * Determines if the given ButtonModel is selected or not.
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119 *
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120 * @param model Model being tested for selected status
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121 * @return Selection state of the given model
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122 * @since 2.0
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123 */
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124 public bool isSelected(ButtonModel model) {
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125 return (model is getSelected());
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126 }
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127
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128 /**
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129 * Removes the given ButtonModel from this ButtonGroup.
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130 *
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131 * @param model ButtonModel being removed
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132 * @since 2.0
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133 */
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134 public void remove(ButtonModel model) {
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135 if (getSelected() is model)
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136 setSelected(getDefault(), true);
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137 if (defaultModel is model)
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138 defaultModel = null;
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139 members.remove(model);
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140 }
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141
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142 /**
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143 * Removes the passed PropertyChangeListener from this ButtonGroup.
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144 *
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145 * @param listener PropertyChangeListener to be removed
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146 * @since 2.0
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147 */
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148 public void removePropertyChangeListener(PropertyChangeListener listener) {
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149 listeners.remove(cast(Object)listener);
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150 }
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151
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152 /**
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153 * Sets the passed ButtonModel to be the currently selected ButtonModel of this
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154 * ButtonGroup. Fires a property change.
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155 *
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156 * @param model ButtonModel to be selected
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157 * @since 2.0
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158 */
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159 protected void selectNewModel(ButtonModel model) {
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160 ButtonModel oldModel = selectedModel;
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161 selectedModel = model;
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162 if (oldModel !is null)
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163 oldModel.setSelected(false);
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164 firePropertyChange(oldModel, model);
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165 }
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166
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167 /**
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168 * Sets the default selection of this ButtonGroup. Does nothing if it is not present in
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169 * the group. Sets selection to the passed ButtonModel.
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170 *
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171 * @param model ButtonModel which is to be the default selection.
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172 * @since 2.0
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173 */
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174 public void setDefault(ButtonModel model) {
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175 defaultModel = model;
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176 if (getSelected() is null && defaultModel !is null)
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177 defaultModel.setSelected(true);
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178 }
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179
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180 /**
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181 * Sets the button with the given ButtonModel to be selected.
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182 *
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183 * @param model The ButtonModel to be selected
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184 * @since 2.0
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185 */
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186 public void setSelected(ButtonModel model) {
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187 if (model is null)
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188 selectNewModel(null);
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189 else
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190 model.setSelected(true);
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191 }
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192
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193 /**
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194 * Sets model to the passed state.
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195 * <p>
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196 * If <i>value</i> is
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197 * <ul>
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198 * <li><code>true</code>:
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199 * <ul>
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200 * <li>The passed ButtonModel will own selection.
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201 * </ul>
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202 * <li><code>false</code>:
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203 * <ul>
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204 * <li>If the passed model owns selection, it will lose selection, and
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205 * selection will be given to the default ButonModel. If no default
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206 * ButtonModel was set, selection will remain as it was, as one ButtonModel
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207 * must own selection at all times.
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208 * <li>If the passed model does not own selection, then selection will remain
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209 * as it was.
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210 * </ul>
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211 * </ul>
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212 *
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213 * @param model The model to be affected
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214 * @param value The selected state
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215 * @since 2.0
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216 */
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217 public void setSelected(ButtonModel model, bool value) {
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218 if (value) {
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219 if (model is getSelected())
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220 return;
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221 selectNewModel(model);
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222 } else {
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223 if (model !is getSelected())
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224 return;
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225 if (getDefault() is null)
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226 return;
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227 getDefault().setSelected(true);
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228 }
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229 }
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230
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231 }