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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, 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 *******************************************************************************/
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11 module dwt.widgets.Dialog;
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12
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13 import dwt.dwthelper.utils;
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14
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15
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16 import dwt.DWT;
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17 import dwt.DWTException;
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18
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19 /**
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20 * This class is the abstract superclass of the classes
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21 * that represent the built in platform dialogs.
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22 * A <code>Dialog</code> typically contains other widgets
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23 * that are not accessible. A <code>Dialog</code> is not
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24 * a <code>Widget</code>.
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25 * <p>
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26 * This class can also be used as the abstract superclass
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27 * for user-designed dialogs. Such dialogs usually consist
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28 * of a Shell with child widgets. The basic template for a
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29 * user-defined dialog typically looks something like this:
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30 * <pre><code>
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31 * public class MyDialog extends Dialog {
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32 * Object result;
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33 *
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34 * public MyDialog (Shell parent, int style) {
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35 * super (parent, style);
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36 * }
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37 * public MyDialog (Shell parent) {
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38 * this (parent, 0); // your default style bits go here (not the Shell's style bits)
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39 * }
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40 * public Object open () {
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41 * Shell parent = getParent();
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42 * Shell shell = new Shell(parent, DWT.DIALOG_TRIM | DWT.APPLICATION_MODAL);
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43 * shell.setText(getText());
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44 * // Your code goes here (widget creation, set result, etc).
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45 * shell.open();
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46 * Display display = parent.getDisplay();
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47 * while (!shell.isDisposed()) {
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48 * if (!display.readAndDispatch()) display.sleep();
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49 * }
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50 * return result;
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51 * }
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52 * }
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53 * </pre></code>
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54 * <p>
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55 * Note: The <em>modality</em> styles supported by this class
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56 * are treated as <em>HINT</em>s, because not all are supported
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57 * by every subclass on every platform. If a modality style is
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58 * not supported, it is "upgraded" to a more restrictive modality
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59 * style that is supported. For example, if <code>PRIMARY_MODAL</code>
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60 * is not supported by a particular dialog, it would be upgraded to
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61 * <code>APPLICATION_MODAL</code>. In addition, as is the case
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62 * for shells, the window manager for the desktop on which the
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63 * instance is visible has ultimate control over the appearance
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64 * and behavior of the instance, including its modality.
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65 * <dl>
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66 * <dt><b>Styles:</b></dt>
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67 * <dd>APPLICATION_MODAL, PRIMARY_MODAL, SYSTEM_MODAL</dd>
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68 * <dt><b>Events:</b></dt>
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69 * <dd>(none)</dd>
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70 * </dl>
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71 * <p>
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72 * Note: Only one of the styles APPLICATION_MODAL, PRIMARY_MODAL,
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73 * and SYSTEM_MODAL may be specified.
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74 * </p>
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75 *
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76 * @see Shell
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77 */
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78
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79 public abstract class Dialog {
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80 int style;
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81 Shell parent;
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82 String title;
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83
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84 /**
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85 * Constructs a new instance of this class given only its
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86 * parent.
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87 *
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88 * @param parent a shell which will be the parent of the new instance
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89 *
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90 * @exception IllegalArgumentException <ul>
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91 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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92 * </ul>
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93 * @exception DWTException <ul>
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94 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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95 * </ul>
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96 */
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97 public Dialog (Shell parent) {
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98 this (parent, DWT.PRIMARY_MODAL);
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99 }
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100
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101 /**
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102 * Constructs a new instance of this class given its parent
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103 * and a style value describing its behavior and appearance.
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104 * <p>
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105 * The style value is either one of the style constants defined in
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106 * class <code>DWT</code> which is applicable to instances of this
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107 * class, or must be built by <em>bitwise OR</em>'ing together
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108 * (that is, using the <code>int</code> "|" operator) two or more
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109 * of those <code>DWT</code> style constants. The class description
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110 * lists the style constants that are applicable to the class.
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111 * Style bits are also inherited from superclasses.
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112 *
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113 * @param parent a shell which will be the parent of the new instance
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114 * @param style the style of dialog to construct
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115 *
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116 * @exception IllegalArgumentException <ul>
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117 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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118 * </ul>
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119 * @exception DWTException <ul>
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120 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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121 * </ul>
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122 *
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123 * @see DWT#PRIMARY_MODAL
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124 * @see DWT#APPLICATION_MODAL
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125 * @see DWT#SYSTEM_MODAL
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126 */
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127 public Dialog (Shell parent, int style) {
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128 checkParent (parent);
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129 this.parent = parent;
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130 this.style = style;
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131 title = "";
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132 }
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133
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134 /**
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135 * Checks that this class can be subclassed.
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136 * <p>
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137 * IMPORTANT: See the comment in <code>Widget.checkSubclass()</code>.
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138 * </p>
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139 *
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140 * @exception DWTException <ul>
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141 * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
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142 * </ul>
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143 *
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144 * @see Widget#checkSubclass
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145 */
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146 protected void checkSubclass () {
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147 if (!Display.isValidClass (getClass ())) {
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148 error (DWT.ERROR_INVALID_SUBCLASS);
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149 }
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150 }
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151
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152 /**
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153 * Throws an exception if the specified widget can not be
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154 * used as a parent for the receiver.
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155 *
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156 * @exception IllegalArgumentException <ul>
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157 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
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158 * <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</li>
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159 * </ul>
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160 * @exception DWTException <ul>
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161 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li>
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162 * </ul>
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163 */
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164 void checkParent (Shell parent) {
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165 if (parent is null) error (DWT.ERROR_NULL_ARGUMENT);
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166 parent.checkWidget ();
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167 }
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168
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169 static int checkStyle (Shell parent, int style) {
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170 style &= ~DWT.MIRRORED;
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171 if ((style & (DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT)) is 0) {
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172 if (parent !is null) {
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173 if ((parent.style & DWT.LEFT_TO_RIGHT) !is 0) style |= DWT.LEFT_TO_RIGHT;
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174 if ((parent.style & DWT.RIGHT_TO_LEFT) !is 0) style |= DWT.RIGHT_TO_LEFT;
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175 }
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176 }
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177 return Widget.checkBits (style, DWT.LEFT_TO_RIGHT, DWT.RIGHT_TO_LEFT, 0, 0, 0, 0);
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178 }
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179
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180 /**
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181 * Does whatever dialog specific cleanup is required, and then
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182 * uses the code in <code>DWTError.error</code> to handle the error.
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183 *
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184 * @param code the descriptive error code
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185 *
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186 * @see DWT#error(int)
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187 */
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188 void error (int code) {
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189 DWT.error(code);
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190 }
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191
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192 /**
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193 * Returns the receiver's parent, which must be a <code>Shell</code>
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194 * or null.
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195 *
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196 * @return the receiver's parent
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197 *
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198 * @exception DWTException <ul>
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199 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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200 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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201 * </ul>
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202 */
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203 public Shell getParent () {
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204 return parent;
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205 }
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206
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207 /**
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208 * Returns the receiver's style information.
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209 * <p>
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210 * Note that, the value which is returned by this method <em>may
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211 * not match</em> the value which was provided to the constructor
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212 * when the receiver was created.
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213 * </p>
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214 *
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215 * @return the style bits
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216 *
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217 * @exception DWTException <ul>
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218 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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219 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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220 * </ul>
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221 */
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222 public int getStyle () {
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223 return style;
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224 }
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225
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226 /**
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227 * Returns the receiver's text, which is the string that the
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228 * window manager will typically display as the receiver's
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229 * <em>title</em>. If the text has not previously been set,
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230 * returns an empty string.
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231 *
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232 * @return the text
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233 *
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234 * @exception DWTException <ul>
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235 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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236 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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237 * </ul>
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238 */
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239 public String getText () {
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240 return title;
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241 }
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242
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243 /**
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244 * Sets the receiver's text, which is the string that the
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245 * window manager will typically display as the receiver's
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246 * <em>title</em>, to the argument, which must not be null.
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247 *
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248 * @param string the new text
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249 *
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250 * @exception IllegalArgumentException <ul>
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251 * <li>ERROR_NULL_ARGUMENT - if the text is null</li>
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252 * </ul>
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253 * @exception DWTException <ul>
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254 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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255 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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256 * </ul>
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257 */
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258 public void setText (String string) {
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259 if (string is null) error (DWT.ERROR_NULL_ARGUMENT);
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260 title = string;
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261 }
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262
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263 }