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annotate dwt/widgets/Item.d @ 45:d8635bb48c7c

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Merge with SWT 3.5
author Jacob Carlborg <doob@me.com>
date Mon, 01 Dec 2008 17:07:00 +0100
parents 5b53d338c709
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <doob@me.com>
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13 *******************************************************************************/
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14 module dwt.widgets.Item;
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16
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17 import dwt.DWT;
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18 import dwt.DWTException;
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19 import dwt.graphics.Image;
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21 import dwt.dwthelper.utils;
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22 import dwt.widgets.Widget;
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23
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24 /**
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25 * This class is the abstract superclass of all non-windowed
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26 * user interface objects that occur within specific controls.
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27 * For example, a tree will contain tree items.
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28 * <dl>
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29 * <dt><b>Styles:</b></dt>
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30 * <dd>(none)</dd>
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31 * <dt><b>Events:</b></dt>
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32 * <dd>(none)</dd>
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33 * </dl>
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34 *
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35 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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36 */
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37
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38 public abstract class Item : Widget {
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39 String text;
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40 Image image;
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41
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42 /**
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43 * Constructs a new instance of this class given its parent
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44 * and a style value describing its behavior and appearance.
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45 * The item is added to the end of the items maintained by its parent.
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46 * <p>
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47 * The style value is either one of the style constants defined in
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48 * class <code>DWT</code> which is applicable to instances of this
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49 * class, or must be built by <em>bitwise OR</em>'ing together
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50 * (that is, using the <code>int</code> "|" operator) two or more
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51 * of those <code>DWT</code> style constants. The class description
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52 * lists the style constants that are applicable to the class.
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53 * Style bits are also inherited from superclasses.
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54 * </p>
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55 *
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56 * @param parent a widget which will be the parent of the new instance (cannot be null)
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57 * @param style the style of item to construct
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58 *
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59 * @exception IllegalArgumentException <ul>
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60 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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61 * </ul>
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62 * @exception DWTException <ul>
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63 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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64 * </ul>
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65 *
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66 * @see DWT
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67 * @see Widget#getStyle
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68 */
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69 public this (Widget parent, int style) {
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70 super (parent, style);
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71 text = "";
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72 }
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73
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74 /**
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75 * Constructs a new instance of this class given its parent
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76 * and a style value describing its behavior and appearance,
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77 * and the index at which to place it in the items maintained
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78 * by its parent.
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79 * <p>
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80 * The style value is either one of the style constants defined in
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81 * class <code>DWT</code> which is applicable to instances of this
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82 * class, or must be built by <em>bitwise OR</em>'ing together
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83 * (that is, using the <code>int</code> "|" operator) two or more
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84 * of those <code>DWT</code> style constants. The class description
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85 * lists the style constants that are applicable to the class.
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86 * Style bits are also inherited from superclasses.
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87 * </p>
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88 *
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89 * @param parent a widget which will be the parent of the new instance (cannot be null)
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90 * @param style the style of item to construct
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91 * @param index the zero-relative index at which to store the receiver in its parent
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92 *
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93 * @exception IllegalArgumentException <ul>
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94 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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95 * <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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96 * </ul>
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97 * @exception DWTException <ul>
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98 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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99 * </ul>
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100 *
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101 * @see DWT
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102 * @see Widget#getStyle
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103 */
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104 public this (Widget parent, int style, int index) {
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105 this (parent, style);
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106 }
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107
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108 protected void checkSubclass () {
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109 /* Do Nothing - Subclassing is allowed */
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110 }
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111
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112 /**
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113 * Returns the receiver's image if it has one, or null
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114 * if it does not.
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115 *
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116 * @return the receiver's image
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117 *
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118 * @exception DWTException <ul>
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119 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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120 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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121 * </ul>
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122 */
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123 public Image getImage () {
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124 checkWidget ();
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125 return image;
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126 }
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127
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128 String getNameText () {
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129 return getText ();
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130 }
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131
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132 /**
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133 * Returns the receiver's text, which will be an empty
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134 * string if it has never been set.
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135 *
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136 * @return the receiver's text
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137 *
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138 * @exception DWTException <ul>
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139 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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140 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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141 * </ul>
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142 */
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143 public String getText () {
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144 checkWidget();
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145 return text;
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146 }
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147
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148 void releaseWidget () {
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149 super.releaseWidget ();
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150 text = null;
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151 image = null;
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152 }
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153
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154 /**
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155 * Sets the receiver's image to the argument, which may be
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156 * null indicating that no image should be displayed.
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157 *
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158 * @param image the image to display on the receiver (may be null)
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159 *
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160 * @exception IllegalArgumentException <ul>
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161 * <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
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162 * </ul>
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163 * @exception DWTException <ul>
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164 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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165 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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166 * </ul>
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167 */
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168 public void setImage (Image image) {
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169 checkWidget ();
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170 if (image !is null && image.isDisposed()) error(DWT.ERROR_INVALID_ARGUMENT);
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171 this.image = image;
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172 }
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173
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174 /**
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175 * Sets the receiver's text.
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176 *
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177 * @param string the new text
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178 *
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179 * @exception IllegalArgumentException <ul>
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180 * <li>ERROR_NULL_ARGUMENT - if the text is null</li>
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181 * </ul>
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182 * @exception DWTException <ul>
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183 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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184 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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185 * </ul>
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186 */
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187 public void setText (String string) {
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188 checkWidget ();
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189 //if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
0
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190 text = string;
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191 }
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192
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193 }