Mercurial > projects > dwt-mac
annotate dwt/events/TraverseEvent.d @ 156:969e7de37c3d default tip
Fixes to get dwt to work with dmd and ldc
author | Jacob Carlborg <doob@me.com> |
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date | Wed, 08 Jul 2009 21:56:44 +0200 |
parents | d8635bb48c7c |
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rev | line source |
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45 | 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 * 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 dwt.events.TraverseEvent; |
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14 |
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15 |
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16 import dwt.widgets.Event; |
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17 import dwt.events.KeyEvent; |
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18 |
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19 import tango.text.convert.Format; |
39 | 20 import dwt.dwthelper.utils; |
21 | |
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22 /** |
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23 * Instances of this class are sent as a result of |
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24 * widget traversal actions. |
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25 * <p> |
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26 * The traversal event allows fine control over keyboard traversal |
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27 * in a control both to implement traversal and override the default |
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28 * traversal behavior defined by the system. This is achieved using |
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29 * two fields, <code>detail</code> and <code>doit</code>. |
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30 * </p><p> |
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31 * When a control is traversed, a traverse event is sent. The detail |
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32 * describes the type of traversal and the doit field indicates the default |
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33 * behavior of the system. For example, when a right arrow key is pressed |
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34 * in a text control, the detail field is <code>TRAVERSE_ARROW_NEXT</code> |
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35 * and the doit field is <code>false</code>, indicating that the system |
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36 * will not traverse to the next tab item and the arrow key will be |
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37 * delivered to the text control. If the same key is pressed in a radio |
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38 * button, the doit field will be <code>true</code>, indicating that |
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39 * traversal is to proceed to the next tab item, possibly another radio |
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40 * button in the group and that the arrow key is not to be delivered |
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41 * to the radio button. |
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42 * </p><p> |
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43 * How can the traversal event be used to implement traversal? |
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44 * When a tab key is pressed in a canvas, the detail field will be |
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45 * <code>TRAVERSE_TAB_NEXT</code> and the doit field will be |
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46 * <code>false</code>. The default behavior of the system is to |
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47 * provide no traversal for canvas controls. This means that by |
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48 * default in a canvas, a key listener will see every key that the |
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49 * user types, including traversal keys. To understand why this |
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50 * is so, it is important to understand that only the widget implementor |
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51 * can decide which traversal is appropriate for the widget. Returning |
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52 * to the <code>TRAVERSE_TAB_NEXT</code> example, a text widget implemented |
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53 * by a canvas would typically want to use the tab key to insert a |
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54 * tab character into the widget. A list widget implementation, on the |
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55 * other hand, would like the system default traversal behavior. Using |
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56 * only the doit flag, both implementations are possible. The text widget |
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57 * implementor sets doit to <code>false</code>, ensuring that the system |
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58 * will not traverse and that the tab key will be delivered to key listeners. |
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59 * The list widget implementor sets doit to <code>true</code>, indicating |
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60 * that the system should perform tab traversal and that the key should not |
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61 * be delivered to the list widget. |
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62 * </p><p> |
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63 * How can the traversal event be used to override system traversal? |
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64 * When the return key is pressed in a single line text control, the |
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65 * detail field is <code>TRAVERSE_RETURN</code> and the doit field |
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66 * is <code>true</code>. This means that the return key will be processed |
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67 * by the default button, not the text widget. If the text widget has |
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68 * a default selection listener, it will not run because the return key |
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69 * will be processed by the default button. Imagine that the text control |
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70 * is being used as an in-place editor and return is used to dispose the |
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71 * widget. Setting doit to <code>false</code> will stop the system from |
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72 * activating the default button but the key will be delivered to the text |
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73 * control, running the key and selection listeners for the text. How |
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74 * can <code>TRAVERSE_RETURN</code> be implemented so that the default button |
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75 * will not be activated and the text widget will not see the return key? |
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76 * This is achieved by setting doit to <code>true</code>, and the detail |
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77 * to <code>TRAVERSE_NONE</code>. |
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78 * </p><p> |
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79 * Note: A widget implementor will typically implement traversal using |
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80 * only the doit flag to either enable or disable system traversal. |
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81 * </p> |
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82 * |
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83 * @see TraverseListener |
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84 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> |
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85 */ |
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86 |
3 | 87 public final class TraverseEvent : KeyEvent { |
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88 |
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89 /** |
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90 * The traversal type. |
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91 * <p><ul> |
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92 * <li>{@link dwt.DWT#TRAVERSE_NONE}</li> |
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93 * <li>{@link dwt.DWT#TRAVERSE_ESCAPE}</li> |
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94 * <li>{@link dwt.DWT#TRAVERSE_RETURN}</li> |
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95 * <li>{@link dwt.DWT#TRAVERSE_TAB_NEXT}</li> |
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96 * <li>{@link dwt.DWT#TRAVERSE_TAB_PREVIOUS}</li> |
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97 * <li>{@link dwt.DWT#TRAVERSE_ARROW_NEXT}</li> |
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98 * <li>{@link dwt.DWT#TRAVERSE_ARROW_PREVIOUS}</li> |
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99 * <li>{@link dwt.DWT#TRAVERSE_MNEMONIC}</li> |
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100 * <li>{@link dwt.DWT#TRAVERSE_PAGE_NEXT}</li> |
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101 * <li>{@link dwt.DWT#TRAVERSE_PAGE_PREVIOUS}</li> |
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102 * </ul></p> |
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103 * |
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104 * Setting this field will change the type of traversal. |
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105 * For example, setting the detail to <code>TRAVERSE_NONE</code> |
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106 * causes no traversal action to be taken. |
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107 * |
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108 * When used in conjunction with the <code>doit</code> field, the |
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109 * traversal detail field can be useful when overriding the default |
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110 * traversal mechanism for a control. For example, setting the doit |
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111 * field to <code>false</code> will cancel the operation and allow |
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112 * the traversal key stroke to be delivered to the control. Setting |
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113 * the doit field to <code>true</code> indicates that the traversal |
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114 * described by the detail field is to be performed. |
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115 */ |
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116 public int detail; |
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117 |
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118 //static final long serialVersionUID = 3257565105301239349L; |
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119 |
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120 /** |
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121 * Constructs a new instance of this class based on the |
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122 * information in the given untyped event. |
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123 * |
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124 * @param e the untyped event containing the information |
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125 */ |
5 | 126 public this(Event e) { |
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127 super(e); |
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128 this.detail = e.detail; |
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129 } |
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130 |
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131 /** |
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132 * Returns a string containing a concise, human-readable |
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133 * description of the receiver. |
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134 * |
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135 * @return a string representation of the event |
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136 */ |
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137 public override String toString() { |
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138 return Format( "{} detail={}}", super.toString[ 0 .. $-2 ], detail ); |
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139 } |
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140 } |