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annotate dwtx/draw2d/Clickable.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.Clickable;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.dwtxhelper.Collection;
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18
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19 import dwtx.draw2d.geometry.Rectangle;
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20 import dwtx.draw2d.Figure;
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21 import dwtx.draw2d.ActionListener;
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22 import dwtx.draw2d.ActionEvent;
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23 import dwtx.draw2d.ChangeListener;
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24 import dwtx.draw2d.ClickableEventHandler;
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25 import dwtx.draw2d.IFigure;
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26 import dwtx.draw2d.ButtonModel;
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27 import dwtx.draw2d.ChangeEvent;
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28 import dwtx.draw2d.Graphics;
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29 import dwtx.draw2d.ToggleModel;
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30 import dwtx.draw2d.StackLayout;
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31 import dwtx.draw2d.ColorConstants;
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32 import dwtx.draw2d.ButtonBorder;
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33
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34
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35 /**
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36 * A Clickable responds to mouse clicks in some way (determined by a ClickBehavior) and
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37 * fires action events. No visual appearance of feedback is offered. Depends on a model
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38 * holder and an event handler which understands the model and updates the model
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39 * accordingly. {@link ButtonModel} is used by default. Any figure can be set as contents
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40 * to a Clickable. Clickable->EventHandler->Model->ModelObserver->Listeners of actions.
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41 */
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42 public class Clickable
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43 : Figure
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44 {
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45
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46 private static const int
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47 ROLLOVER_ENABLED_FLAG = Figure.MAX_FLAG << 1,
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48 STYLE_BUTTON_FLAG = Figure.MAX_FLAG << 2,
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49 STYLE_TOGGLE_FLAG = Figure.MAX_FLAG << 3;
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50
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51 /**
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52 * The highest reserved flag used by this class
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53 */
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54 protected static int
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55 MAX_FLAG = STYLE_TOGGLE_FLAG;
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56
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57 /**
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58 * Style constant that defines a push button. The button will be pressed when the mouse is
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59 * pressed on top of it. The button will be released when the mouse is released or is move
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60 * off of the button.
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61 *
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62 */
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63 public static const int STYLE_BUTTON = STYLE_BUTTON_FLAG;
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64
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65 /**
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66 * Style constant that defines a toggle button. The button will toggle between 2 states
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67 * when the mouse is clicked on the button.
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68 */
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69 public static const int STYLE_TOGGLE = STYLE_TOGGLE_FLAG;
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70
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71 /**
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72 * An action is performed every time the mouse is released.
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73 */
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74 public static const int DEFAULT_FIRING = 0;
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75
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76 /**
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77 * Firing starts as soon as the mouse is pressed on this Clickable, and keeps firing at
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78 * prefixed intervals until the mouse is released.
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79 */
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80 public static const int REPEAT_FIRING = 1;
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81
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82 /**
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83 * Observes the model for action and state changes.
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84 *
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85 * @see ActionListener
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86 * @see ChangeListener
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87 */
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88 /+static+/ interface ModelObserver
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89 : ActionListener, ChangeListener
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90 { }
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91
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92 private ClickableEventHandler eventHandler;
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93
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94 private ButtonModel model;
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95
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96 private ModelObserver modelObserver;
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97
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98 private void instanceInit(){
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99 init();
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100 setRequestFocusEnabled(true);
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101 setFocusTraversable(true);
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102 }
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103
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104 /**
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105 * Constructs a Clickable with no contents.
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106 */
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107 public this() {
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108 instanceInit();
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109 }
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110
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111 /**
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112 * Constructs a Clickable whose contents are provided as input. The content figure
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113 * occupies the entire region of the Clickable.
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114 *
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115 * @param contents The content figure
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116 */
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117 public this(IFigure contents) {
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118 this(contents, 0);
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119 }
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120
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121 /**
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122 * Constructs a Clickable whose contents are provided as input. The content figure
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123 * occupies the entire region of the Clickable. Sets the style to the given <i>style</i>
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124 * (either {@link #STYLE_BUTTON} or {@link #STYLE_TOGGLE}).
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125 *
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126 * @param contents The content figure
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127 * @param style The button style
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128 */
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129 public this(IFigure contents, int style) {
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130 instanceInit();
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131 setContents(contents);
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132 setStyle(style);
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133 }
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134
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135 /**
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136 * Adds the given listener to the list of action listeners of this Figure. Listener is
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137 * called whenever an action is performed.
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138 *
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139 * @param listener The ActionListener to be added
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140 * @since 2.0
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141 */
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142 public void addActionListener(ActionListener listener) {
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143 addListener(ActionListener.classinfo, cast(Object)listener);
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144 }
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145
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146 /**
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147 * Adds the given listener to the list of state change listeners of this figure. A
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148 * ChangeListener is informed if there is any state change in the model requiring action
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149 * by the listener.
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150 *
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151 * @param listener The ChangeListener to be added
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152 * @since 2.0
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153 */
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154 public void addChangeListener(ChangeListener listener) {
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155 addListener(ChangeListener.classinfo, cast(Object)listener);
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156 }
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157
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158 /**
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159 * Returns a newly created ButtonModel as the default model to be used by this Clickable
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160 * based on the button style.
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161 *
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162 * @return The model to be used by default
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163 * @since 2.0
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164 */
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165 protected ButtonModel createDefaultModel() {
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166 if (isStyle(STYLE_TOGGLE))
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167 return new ToggleModel();
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168 else
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169 return new ButtonModel();
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170 }
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171
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172 /**
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173 * Returns a newly created event handler for this Clickable and its model.
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174 *
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175 * @return The event handler
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176 * @since 2.0
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177 */
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178 protected ClickableEventHandler createEventHandler() {
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179 return new ClickableEventHandler();
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180 }
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181
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182 /**
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183 * Returns a newly created model observer which listens to the model, and fires any action
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184 * or state changes. A ModelObserver holds both an action listener and a state change
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185 * listener.
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186 *
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187 * @return The newly created model observer
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188 * @since 2.0
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189 */
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190 protected ModelObserver createModelObserver() {
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191 return new class() ModelObserver {
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192 public void actionPerformed(ActionEvent action) {
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193 fireActionPerformed();
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194 }
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195 public void handleStateChanged(ChangeEvent change) {
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196 fireStateChanged(change);
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197 }
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198 };
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199 }
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200
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201 /**
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202 * Fires an action performed event.
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203 *
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204 * @since 2.0
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205 */
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206 public void doClick() {
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207 fireActionPerformed();
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208 }
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209
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210 /**
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211 * Called when there has been an action performed by this Clickable, which is determined
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212 * by the model. Notifies all ActionListener type listeners of an action performed.
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213 *
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214 * @since 2.0
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215 */
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216 protected void fireActionPerformed() {
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217 ActionEvent action = new ActionEvent(this);
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218 Iterator listeners = getListeners(ActionListener.classinfo);
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219 while (listeners.hasNext())
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220 (cast(ActionListener)listeners.next()) //Leave newline for debug stepping
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221 .actionPerformed(action);
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222 }
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223
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224 /**
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225 * Called when there has been a change of state in the model of this clickable. Notifies
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226 * all ChangeListener type listeners of the state change.
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227 *
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228 * @param modelChange The ChangeEvent
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229 * @since 2.0
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230 */
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231 protected void fireStateChanged(ChangeEvent modelChange) {
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232 ChangeEvent change = new ChangeEvent(this, modelChange.getPropertyName());
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233 Iterator listeners = getListeners(ChangeListener.classinfo);
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234 while (listeners.hasNext())
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235 (cast(ChangeListener)listeners.next()) //Leave newline for debug stepping
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236 .handleStateChanged(change);
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237 }
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238
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239 /**
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240 * Returns the behavior model used by this Clickable.
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241 *
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242 * @return The model used by this Clickable
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243 * @since 2.0
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244 */
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245 public ButtonModel getModel() {
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246 return model;
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247 }
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248
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249 /**
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250 * Adds the given ClickableEventHandler to this clickable. A ClickableEventHandler
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251 * should be a MouseListener, MouseMotionListener, ChangeListener, KeyListener, and
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252 * FocusListener.
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253 *
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254 * @param handler The new event handler
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255 * @since 2.0
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256 */
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257 protected void hookEventHandler(ClickableEventHandler handler) {
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258 if (handler is null)
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259 return;
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260 addMouseListener(handler);
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261 addMouseMotionListener(handler);
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262 addChangeListener(handler);
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263 addKeyListener(handler);
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264 addFocusListener(handler);
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265 }
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266
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267 /**
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268 * Initializes this Clickable by setting a default model and adding a clickable event
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269 * handler for that model.
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270 *
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271 * @since 2.0
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272 */
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273 protected void init() {
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274 setModel(createDefaultModel());
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275 setEventHandler(createEventHandler());
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276 }
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277
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278 /**
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279 * Returns <code>true</code> if rollover feedback is enabled.
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280 *
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281 * @return <code>true</code> rollover feedback is enabled
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282 * @since 2.0
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283 */
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284 public bool isRolloverEnabled() {
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285 return (flags & ROLLOVER_ENABLED_FLAG) !is 0;
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286 }
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287
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288 /**
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289 * Returns <code>true</code> if this Clickable is in a selected state. The model is the
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290 * one which holds all this state based information.
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291 *
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292 * @return <code>true</code> if this Clickable is in a selected state
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293 * @since 2.0
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294 */
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295 public bool isSelected() {
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296 return getModel().isSelected();
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297 }
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298
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299 /**
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300 * Returns <code>true</code> if this Clickable's style is the same as the passed style.
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301 *
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302 * @param style The style to be checked
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303 * @return <code>true</code> if this Clickable's style is the same as the passed style
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304 * @since 2.0
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305 */
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306 public bool isStyle(int style) {
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307 return ((style & flags) is style);
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308 }
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309
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310 /**
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311 * If this Clickable has focus, this method paints a focus rectangle.
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312 *
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313 * @param graphics Graphics handle for painting
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314 */
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315 protected void paintBorder(Graphics graphics) {
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316 super.paintBorder(graphics);
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317 if (hasFocus()) {
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318 graphics.setForegroundColor(ColorConstants.black);
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319 graphics.setBackgroundColor(ColorConstants.white);
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320
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321 Rectangle area = getClientArea();
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322 if (isStyle(STYLE_BUTTON))
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323 graphics.drawFocus(area.x, area.y, area.width, area.height);
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324 else
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325 graphics.drawFocus(area.x, area.y, area.width - 1, area.height - 1);
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326 }
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327 }
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328
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329 /**
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330 * Paints the area of this figure excluded by the borders. Induces a (1,1) pixel shift in
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331 * the painting if the mouse is armed, giving it the pressed appearance.
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332 *
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333 * @param graphics Graphics handle for painting
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334 * @since 2.0
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335 */
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336 protected void paintClientArea(Graphics graphics) {
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337 if (isStyle(STYLE_BUTTON) && (getModel().isArmed() || getModel().isSelected())) {
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338 graphics.translate(1, 1);
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339 graphics.pushState();
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340 super.paintClientArea(graphics);
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341 graphics.popState();
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342 graphics.translate(-1, -1);
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343 } else
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344 super.paintClientArea(graphics);
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345 }
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346
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347 /**
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348 * Removes the given listener from the list of ActionListener's of this Clickable.
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349 *
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350 * @param listener Listener to be removed from this figure
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351 * @since 2.0
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352 */
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353 public void removeActionListener(ActionListener listener) {
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354 removeListener(ActionListener.classinfo, cast(Object)listener);
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355 }
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356
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357 /**
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358 * Removes the given listener from the list of ChangeListener's of this clickable.
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359 *
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360 * @param listener Listener to be removed from this figure
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361 * @since 2.0
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362 */
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363 public void removeChangeListener(ChangeListener listener) {
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364 removeListener(ChangeListener.classinfo, cast(Object)listener);
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365 }
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366
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367 /**
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368 * Sets the Figure which is the contents of this Clickable. This Figure occupies the
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369 * entire clickable region.
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370 *
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371 * @param contents Contents of the clickable
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372 * @since 2.0
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373 */
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374 protected void setContents(IFigure contents) {
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375 setLayoutManager(new StackLayout());
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376 if (getChildren().size() > 0)
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377 remove(cast(IFigure)getChildren().get(0));
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378 add(contents);
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379 }
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380
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381 /**
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382 * @see dwtx.draw2d.IFigure#setEnabled(bool)
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383 */
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384 public void setEnabled(bool value) {
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385 if (isEnabled() is value)
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386 return;
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387 super.setEnabled(value);
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388 getModel().setEnabled(value);
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389 setChildrenEnabled(value);
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390 }
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391
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parents:
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392 /**
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393 * Sets the event handler which interacts with the model to determine the behavior of this
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parents:
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394 * Clickable.
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parents:
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395 *
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396 * @param h Event handler for this clickable
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parents:
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397 * @since 2.0
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diff changeset
398 */
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parents:
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399 public void setEventHandler(ClickableEventHandler h) {
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400 if (eventHandler !is null)
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diff changeset
401 unhookEventHandler(eventHandler);
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diff changeset
402 eventHandler = h;
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diff changeset
403 if (eventHandler !is null)
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diff changeset
404 hookEventHandler(eventHandler);
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405 }
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parents:
diff changeset
406
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parents:
diff changeset
407 /**
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408 * Determines how this clickable is to fire notifications to its listeners. In the default
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409 * firing method ({@link #DEFAULT_FIRING}), an action is performed every time the mouse
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410 * is released. In the repeat firing method ({@link #REPEAT_FIRING}), firing starts as
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parents:
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411 * soon as it is pressed on this clickable, and keeps firing at prefixed intervals until
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parents:
diff changeset
412 * the mouse is released.
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parents:
diff changeset
413 *
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parents:
diff changeset
414 * @param type Type of firing
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parents:
diff changeset
415 * @since 2.0
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416 */
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parents:
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417 public void setFiringMethod(int type) {
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418 getModel().setFiringBehavior(type);
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419 }
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parents:
diff changeset
420
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parents:
diff changeset
421 /**
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diff changeset
422 * Sets the model to be used by this clickable for its state and behavior determination.
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423 * This clickable removes any observers from the previous model before adding new ones to
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parents:
diff changeset
424 * the new model.
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parents:
diff changeset
425 *
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parents:
diff changeset
426 * @param model The new model of this Clickable
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parents:
diff changeset
427 * @since 2.0
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428 */
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parents:
diff changeset
429 public void setModel(ButtonModel model) {
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430 if (this.model !is null) {
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diff changeset
431 this.model.removeChangeListener(modelObserver);
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diff changeset
432 this.model.removeActionListener(modelObserver);
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433 modelObserver = null;
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parents:
diff changeset
434 }
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diff changeset
435 this.model = model;
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diff changeset
436 if (model !is null) {
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parents:
diff changeset
437 modelObserver = createModelObserver();
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diff changeset
438 model.addActionListener(modelObserver);
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parents:
diff changeset
439 model.addChangeListener(modelObserver);
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parents:
diff changeset
440 }
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parents:
diff changeset
441 }
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parents:
diff changeset
442
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parents:
diff changeset
443 /**
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parents:
diff changeset
444 * Enables or disables rollover feedback of this figure. Generally used in conjunction
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parents:
diff changeset
445 * with the model to determine if feedback is to be shown.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
446 *
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parents:
diff changeset
447 * @param value The rollover state to be set
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parents:
diff changeset
448 * @since 2.0
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parents:
diff changeset
449 */
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parents:
diff changeset
450 public void setRolloverEnabled(bool value) {
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parents:
diff changeset
451 if (isRolloverEnabled() is value)
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parents:
diff changeset
452 return;
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parents:
diff changeset
453 setFlag(ROLLOVER_ENABLED_FLAG, value);
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parents:
diff changeset
454 repaint();
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parents:
diff changeset
455 }
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parents:
diff changeset
456
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parents:
diff changeset
457 /**
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parents:
diff changeset
458 * Sets the selected state of this Clickable. Since the model is responsible for all state
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parents:
diff changeset
459 * based information, it is informed of the state change. Extending classes can choose
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parents:
diff changeset
460 * selection information, if they do not represent any selection.
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parents:
diff changeset
461 *
95307ad235d9 Added Draw2d code, still work in progress
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parents:
diff changeset
462 * @param value New selected state of this clickable.
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parents:
diff changeset
463 * @see #isSelected()
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parents:
diff changeset
464 * @since 2.0
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parents:
diff changeset
465 */
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parents:
diff changeset
466 public void setSelected(bool value) {
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parents:
diff changeset
467 getModel().setSelected(value);
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parents:
diff changeset
468 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
469
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parents:
diff changeset
470 /**
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parents:
diff changeset
471 * Sets this Clickable's style to the passed value, either {@link #STYLE_BUTTON} or
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parents:
diff changeset
472 * {@link #STYLE_TOGGLE}.
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parents:
diff changeset
473 *
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parents:
diff changeset
474 * @param style The button style
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parents:
diff changeset
475 * @since 2.0
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parents:
diff changeset
476 */
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parents:
diff changeset
477 public void setStyle(int style) {
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parents:
diff changeset
478 if ((style & STYLE_BUTTON) !is 0) {
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parents:
diff changeset
479 setFlag(STYLE_BUTTON_FLAG, true);
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parents:
diff changeset
480 if (!(null !is cast(ButtonBorder)getBorder() ))
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Frank Benoit <benoit@tionex.de>
parents:
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481 setBorder(new ButtonBorder());
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482 setOpaque(true);
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483 } else {
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484 setFlag(STYLE_BUTTON_FLAG, false);
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485 setOpaque(false);
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486 }
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487
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488 if ((style & STYLE_TOGGLE) !is 0) {
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489 setFlag(STYLE_TOGGLE_FLAG, true);
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490 setModel(createDefaultModel());
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491 }
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492 }
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493
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494 /**
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495 * Removes the given ClickableEventHandler containing listeners from this Clickable.
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496 *
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497 * @param handler The event handler to be removed
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498 * @since 2.0
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499 */
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500 protected void unhookEventHandler(ClickableEventHandler handler) {
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501 if (handler is null)
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502 return;
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503 removeMouseListener(handler);
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504 removeMouseMotionListener(handler);
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505 removeChangeListener(handler);
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506 }
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507
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508 }