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annotate dwt/widgets/ExpandItem.d @ 0:380af2bdd8e5

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Upload of whole dwt tree
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Sat, 09 Aug 2008 17:00:02 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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 module dwt.widgets.ExpandItem;
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12
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13 import dwt.dwthelper.utils;
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14
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15 import dwt.DWT;
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16 import dwt.DWTException;
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17 import dwt.graphics.GC;
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18 import dwt.graphics.Image;
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19 import dwt.graphics.Point;
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20 import dwt.graphics.Rectangle;
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21
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22 /**
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23 * Instances of this class represent a selectable user interface object
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24 * that represents a expandable item in a expand bar.
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25 * <p>
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26 * <dl>
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27 * <dt><b>Styles:</b></dt>
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28 * <dd>(none)</dd>
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29 * <dt><b>Events:</b></dt>
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30 * <dd>(none)</dd>
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31 * </dl>
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32 * </p><p>
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33 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
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34 * </p>
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35 *
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36 * @see ExpandBar
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37 *
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38 * @since 3.2
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39 */
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40 public class ExpandItem extends Item {
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41 ExpandBar parent;
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42 Control control;
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43 bool expanded;
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44 int x, y, width, height;
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45 int imageHeight, imageWidth;
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46 static final int TEXT_INSET = 6;
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47 static final int BORDER = 1;
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48 static final int CHEVRON_SIZE = 24;
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49
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50 /**
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51 * Constructs a new instance of this class given its parent
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52 * and a style value describing its behavior and appearance.
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53 * <p>
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54 * The style value is either one of the style constants defined in
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55 * class <code>DWT</code> which is applicable to instances of this
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56 * class, or must be built by <em>bitwise OR</em>'ing together
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57 * (that is, using the <code>int</code> "|" operator) two or more
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58 * of those <code>DWT</code> style constants. The class description
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59 * lists the style constants that are applicable to the class.
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60 * Style bits are also inherited from superclasses.
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61 * </p>
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62 *
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63 * @param parent a composite control which will be the parent of the new instance (cannot be null)
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64 * @param style the style of control to construct
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65 *
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66 * @exception IllegalArgumentException <ul>
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67 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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68 * </ul>
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69 * @exception DWTException <ul>
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70 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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71 * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
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72 * </ul>
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73 *
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74 * @see Widget#checkSubclass
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75 * @see Widget#getStyle
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76 */
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77 public ExpandItem (ExpandBar parent, int style) {
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78 this (parent, style, checkNull (parent).getItemCount ());
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79 }
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80
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81 /**
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82 * Constructs a new instance of this class given its parent, a
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83 * style value describing its behavior and appearance, and the index
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84 * at which to place it in the items maintained by its parent.
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85 * <p>
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86 * The style value is either one of the style constants defined in
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87 * class <code>DWT</code> which is applicable to instances of this
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88 * class, or must be built by <em>bitwise OR</em>'ing together
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89 * (that is, using the <code>int</code> "|" operator) two or more
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90 * of those <code>DWT</code> style constants. The class description
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91 * lists the style constants that are applicable to the class.
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92 * Style bits are also inherited from superclasses.
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93 * </p>
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94 *
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95 * @param parent a composite control which will be the parent of the new instance (cannot be null)
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96 * @param style the style of control to construct
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97 * @param index the zero-relative index to store the receiver in its parent
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98 *
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99 * @exception IllegalArgumentException <ul>
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100 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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101 * <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the parent (inclusive)</li>
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102 * </ul>
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103 * @exception DWTException <ul>
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104 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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105 * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
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106 * </ul>
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107 *
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108 * @see Widget#checkSubclass
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109 * @see Widget#getStyle
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110 */
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111 public ExpandItem (ExpandBar parent, int style, int index) {
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112 super (parent, style);
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113 this.parent = parent;
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114 parent.createItem (this, style, index);
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115 }
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116
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117 static ExpandBar checkNull (ExpandBar control) {
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118 if (control is null) DWT.error (DWT.ERROR_NULL_ARGUMENT);
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119 return control;
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120 }
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121
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122 public void dispose () {
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123 if (isDisposed ()) return;
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124 //if (!isValidThread ()) error (DWT.ERROR_THREAD_INVALID_ACCESS);
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125 parent.destroyItem (this);
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126 super.dispose();
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127 parent = null;
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128 control = null;
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129 }
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130
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131 void drawChevron (GC gc, int x, int y) {
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132 int [] polyline1, polyline2;
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133 if (expanded) {
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134 int px = x + 4 + 5;
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135 int py = y + 4 + 7;
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136 polyline1 = new int [] {
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137 px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3,
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138 px+3,py-2, px+4,py-2, px+4,py-1, px+5,py-1, px+5,py, px+6,py};
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139 py += 4;
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140 polyline2 = new int [] {
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141 px,py, px+1,py, px+1,py-1, px+2,py-1, px+2,py-2, px+3,py-2, px+3,py-3,
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142 px+3,py-2, px+4,py-2, px+4,py-1, px+5,py-1, px+5,py, px+6,py};
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143 } else {
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144 int px = x + 4 + 5;
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145 int py = y + 4 + 4;
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146 polyline1 = new int[] {
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147 px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3,
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148 px+3,py+2, px+4,py+2, px+4,py+1, px+5,py+1, px+5,py, px+6,py};
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149 py += 4;
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150 polyline2 = new int [] {
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151 px,py, px+1,py, px+1,py+1, px+2,py+1, px+2,py+2, px+3,py+2, px+3,py+3,
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152 px+3,py+2, px+4,py+2, px+4,py+1, px+5,py+1, px+5,py, px+6,py};
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153 }
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154 gc.setForeground (display.getSystemColor (DWT.COLOR_TITLE_FOREGROUND));
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155 gc.drawPolyline (polyline1);
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156 gc.drawPolyline (polyline2);
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157 }
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158
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159 void drawItem (GC gc, bool drawFocus) {
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160 int headerHeight = parent.getBandHeight ();
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161 Display display = getDisplay ();
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162 gc.setForeground (display.getSystemColor (DWT.COLOR_TITLE_BACKGROUND));
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163 gc.setBackground (display.getSystemColor (DWT.COLOR_TITLE_BACKGROUND_GRADIENT));
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164 gc.fillGradientRectangle (x, y, width, headerHeight, true);
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165 if (expanded) {
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166 gc.setForeground (display.getSystemColor (DWT.COLOR_TITLE_BACKGROUND_GRADIENT));
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167 gc.drawLine (x, y + headerHeight, x, y + headerHeight + height - 1);
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168 gc.drawLine (x, y + headerHeight + height - 1, x + width - 1, y + headerHeight + height - 1);
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169 gc.drawLine (x + width - 1, y + headerHeight + height - 1, x + width - 1, y + headerHeight);
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170 }
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171 int drawX = x;
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172 if (image !is null) {
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173 drawX += ExpandItem.TEXT_INSET;
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174 if (imageHeight > headerHeight) {
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175 gc.drawImage (image, drawX, y + headerHeight - imageHeight);
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176 } else {
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177 gc.drawImage (image, drawX, y + (headerHeight - imageHeight) / 2);
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178 }
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179 drawX += imageWidth;
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180 }
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181 if (text.length() > 0) {
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182 drawX += ExpandItem.TEXT_INSET;
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183 Point size = gc.stringExtent (text);
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184 gc.setForeground (parent.getForeground ());
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185 gc.drawString (text, drawX, y + (headerHeight - size.y) / 2, true);
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186 }
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187 int chevronSize = ExpandItem.CHEVRON_SIZE;
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188 drawChevron (gc, x + width - chevronSize, y + (headerHeight - chevronSize) / 2);
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189 if (drawFocus) {
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190 gc.drawFocus (x + 1, y + 1, width - 2, headerHeight - 2);
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191 }
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192 }
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193
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194 /**
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195 * Returns the control that is shown when the item is expanded.
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196 * If no control has been set, return <code>null</code>.
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197 *
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198 * @return the control
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199 *
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200 * @exception DWTException <ul>
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201 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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202 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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203 * </ul>
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204 */
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205 public Control getControl() {
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206 checkWidget ();
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207 return control;
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208 }
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209
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210 /**
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211 * Returns <code>true</code> if the receiver is expanded,
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212 * and false otherwise.
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213 *
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214 * @return the expanded state
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215 *
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216 * @exception DWTException <ul>
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217 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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218 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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219 * </ul>
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220 */
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221 public bool getExpanded() {
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222 checkWidget ();
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223 return expanded;
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224 }
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225
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226 /**
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227 * Returns the height of the receiver's header
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228 *
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229 * @return the height of the header
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230 *
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231 * @exception DWTException <ul>
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232 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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233 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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234 * </ul>
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235 */
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236 public int getHeaderHeight () {
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237 checkWidget ();
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238 return Math.max (parent.getBandHeight (), imageHeight);
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239 }
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240
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241 /**
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242 * Gets the height of the receiver.
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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243 *
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244 * @return the height
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245 *
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246 * @exception DWTException <ul>
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247 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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248 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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249 * </ul>
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250 */
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251 public int getHeight () {
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252 checkWidget ();
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253 return height;
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254 }
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255
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256 /**
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257 * Returns the receiver's parent, which must be a <code>ExpandBar</code>.
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258 *
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259 * @return the receiver's parent
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260 *
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261 * @exception DWTException <ul>
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262 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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263 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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264 * </ul>
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265 */
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266 public ExpandBar getParent () {
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267 checkWidget ();
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268 return parent;
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269 }
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270
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271 int getPreferredWidth (GC gc) {
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272 int width = ExpandItem.TEXT_INSET * 2 + ExpandItem.CHEVRON_SIZE;
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273 if (image !is null) {
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274 width += ExpandItem.TEXT_INSET + imageWidth;
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275 }
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276 if (text.length() > 0) {
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277 width += gc.stringExtent (text).x;
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278 }
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279 return width;
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280 }
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281
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282 void redraw () {
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283 int headerHeight = parent.getBandHeight ();
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284 if (imageHeight > headerHeight) {
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285 parent.redraw (x + ExpandItem.TEXT_INSET, y + headerHeight - imageHeight, imageWidth, imageHeight, false);
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286 }
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287 parent.redraw (x, y, width, headerHeight + height, false);
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288 }
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289
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290 void setBounds (int x, int y, int width, int height, bool move, bool size) {
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291 redraw ();
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292 int headerHeight = parent.getBandHeight ();
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293 if (move) {
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294 if (imageHeight > headerHeight) {
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295 y += (imageHeight - headerHeight);
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296 }
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297 this.x = x;
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298 this.y = y;
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299 redraw ();
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300 }
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301 if (size) {
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302 this.width = width;
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303 this.height = height;
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304 redraw ();
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305 }
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306 if (control !is null && !control.isDisposed ()) {
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307 if (move) control.setLocation (x + BORDER, y + headerHeight);
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308 if (size) control.setSize (Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER));
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309 }
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310 }
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311
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312 /**
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313 * Sets the control that is shown when the item is expanded.
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314 *
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315 * @param control the new control (or null)
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316 *
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317 * @exception IllegalArgumentException <ul>
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318 * <li>ERROR_INVALID_ARGUMENT - if the control has been disposed</li>
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parents:
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319 * <li>ERROR_INVALID_PARENT - if the control is not in the same widget tree</li>
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parents:
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320 * </ul>
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parents:
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321 * @exception DWTException <ul>
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parents:
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322 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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parents:
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323 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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parents:
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324 * </ul>
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parents:
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325 */
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parents:
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326 public void setControl(Control control) {
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parents:
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327 checkWidget ();
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parents:
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328 if (control !is null) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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329 if (control.isDisposed ()) error (DWT.ERROR_INVALID_ARGUMENT);
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parents:
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330 if (control.parent !is parent) error (DWT.ERROR_INVALID_PARENT);
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parents:
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331 }
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parents:
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332 this.control = control;
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parents:
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333 if (control !is null) {
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334 control.setVisible (expanded);
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parents:
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335 int headerHeight = parent.getBandHeight ();
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336 control.setBounds (x + BORDER, y + headerHeight, Math.max (0, width - 2 * BORDER), Math.max (0, height - BORDER));
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337 }
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338 }
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parents:
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339
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parents:
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340 /**
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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341 * Sets the expanded state of the receiver.
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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342 *
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parents:
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343 * @param expanded the new expanded state
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parents:
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344 *
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345 * @exception DWTException <ul>
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parents:
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346 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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parents:
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347 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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parents:
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348 * </ul>
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349 */
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350 public void setExpanded (bool expanded) {
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351 checkWidget ();
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352 this.expanded = expanded;
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353 parent.showItem (this);
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parents:
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354 }
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355
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356 public void setImage (Image image) {
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parents:
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357 super.setImage (image);
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358 int oldImageHeight = imageHeight;
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parents:
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359 if (image !is null) {
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360 Rectangle bounds = image.getBounds ();
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361 imageHeight = bounds.height;
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362 imageWidth = bounds.width;
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363 } else {
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364 imageHeight = imageWidth = 0;
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parents:
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365 }
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366 if (oldImageHeight !is imageHeight) {
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parents:
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367 parent.layoutItems (parent.indexOf (this), true);
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parents:
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368 } else {
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parents:
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369 redraw ();
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parents:
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370 }
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parents:
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371 }
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parents:
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372
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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373 /**
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parents:
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374 * Sets the height of the receiver. This is height of the item when it is expanded,
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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375 * excluding the height of the header.
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
diff changeset
376 *
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
parents:
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377 * @param height the new height
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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378 *
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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379 * @exception DWTException <ul>
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380 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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381 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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382 * </ul>
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383 */
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384 public void setHeight (int height) {
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385 checkWidget ();
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386 if (height < 0) return;
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387 setBounds (0, 0, width, height, false, true);
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388 if (expanded) parent.layoutItems (parent.indexOf (this) + 1, true);
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389 }
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390
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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391 public void setText (String string) {
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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392 super.setText (string);
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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393 redraw ();
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394 }
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395 }