Mercurial > projects > dwt-mac
annotate dwt/widgets/Slider.d @ 76:3f1bfbd329c0
Ported dwt.widgets.Slider
author | Jacob Carlborg <doob@me.com> |
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date | Wed, 24 Dec 2008 12:32:20 +0100 |
parents | cfa563df4fdd |
children | c7f7f4d7091a |
rev | line source |
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45 | 1 /******************************************************************************* |
2 * Copyright (c) 2000, 2008 IBM Corporation and others. | |
0
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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 |
76 | 10 * |
11 * Port to the D programming language: | |
12 * Jacob Carlborg <doob@me.com> | |
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13 *******************************************************************************/ |
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14 module dwt.widgets.Slider; |
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15 |
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16 import dwt.dwthelper.utils; |
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17 |
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18 |
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19 import dwt.DWT; |
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20 import dwt.DWTException; |
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21 import dwt.events.SelectionEvent; |
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22 import dwt.events.SelectionListener; |
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23 import dwt.graphics.Point; |
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24 import dwt.internal.cocoa.NSRect; |
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25 import dwt.internal.cocoa.NSScroller; |
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26 import dwt.internal.cocoa.OS; |
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27 import dwt.internal.cocoa.SWTScroller; |
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28 |
76 | 29 import dwt.widgets.Composite; |
30 import dwt.widgets.Control; | |
31 import dwt.widgets.Event; | |
32 import dwt.widgets.TypedListener; | |
33 | |
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34 /** |
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35 * Instances of this class are selectable user interface |
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36 * objects that represent a range of positive, numeric values. |
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37 * <p> |
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38 * At any given moment, a given slider will have a |
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39 * single 'selection' that is considered to be its |
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40 * value, which is constrained to be within the range of |
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41 * values the slider represents (that is, between its |
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42 * <em>minimum</em> and <em>maximum</em> values). |
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43 * </p><p> |
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44 * Typically, sliders will be made up of five areas: |
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45 * <ol> |
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46 * <li>an arrow button for decrementing the value</li> |
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47 * <li>a page decrement area for decrementing the value by a larger amount</li> |
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48 * <li>a <em>thumb</em> for modifying the value by mouse dragging</li> |
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49 * <li>a page increment area for incrementing the value by a larger amount</li> |
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50 * <li>an arrow button for incrementing the value</li> |
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51 * </ol> |
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52 * Based on their style, sliders are either <code>HORIZONTAL</code> |
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53 * (which have a left facing button for decrementing the value and a |
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54 * right facing button for incrementing it) or <code>VERTICAL</code> |
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55 * (which have an upward facing button for decrementing the value |
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56 * and a downward facing buttons for incrementing it). |
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57 * </p><p> |
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58 * On some platforms, the size of the slider's thumb can be |
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59 * varied relative to the magnitude of the range of values it |
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60 * represents (that is, relative to the difference between its |
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61 * maximum and minimum values). Typically, this is used to |
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62 * indicate some proportional value such as the ratio of the |
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63 * visible area of a document to the total amount of space that |
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64 * it would take to display it. DWT supports setting the thumb |
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65 * size even if the underlying platform does not, but in this |
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66 * case the appearance of the slider will not change. |
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67 * </p> |
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68 * <dl> |
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69 * <dt><b>Styles:</b></dt> |
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70 * <dd>HORIZONTAL, VERTICAL</dd> |
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71 * <dt><b>Events:</b></dt> |
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72 * <dd>Selection</dd> |
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73 * </dl> |
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74 * <p> |
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75 * Note: Only one of the styles HORIZONTAL and VERTICAL may be specified. |
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76 * </p><p> |
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77 * IMPORTANT: This class is <em>not</em> intended to be subclassed. |
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78 * </p> |
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79 * |
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80 * @see ScrollBar |
45 | 81 * @see <a href="http://www.eclipse.org/swt/snippets/#slider">Slider snippets</a> |
82 * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Example: ControlExample</a> | |
83 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> | |
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84 */ |
3 | 85 public class Slider : Control { |
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86 bool dragging; |
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87 int minimum, maximum, thumb; |
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88 int increment = 1; |
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89 int pageIncrement = 10; |
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90 |
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91 /** |
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92 * Constructs a new instance of this class given its parent |
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93 * and a style value describing its behavior and appearance. |
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94 * <p> |
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95 * The style value is either one of the style constants defined in |
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96 * class <code>DWT</code> which is applicable to instances of this |
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97 * class, or must be built by <em>bitwise OR</em>'ing together |
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98 * (that is, using the <code>int</code> "|" operator) two or more |
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99 * of those <code>DWT</code> style constants. The class description |
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100 * lists the style constants that are applicable to the class. |
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101 * Style bits are also inherited from superclasses. |
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102 * </p> |
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103 * |
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104 * @param parent a composite control which will be the parent of the new instance (cannot be null) |
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105 * @param style the style of control to construct |
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106 * |
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107 * @exception IllegalArgumentException <ul> |
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108 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
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109 * </ul> |
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110 * @exception DWTException <ul> |
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111 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
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112 * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
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113 * </ul> |
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114 * |
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115 * @see DWT#HORIZONTAL |
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116 * @see DWT#VERTICAL |
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117 * @see Widget#checkSubclass |
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118 * @see Widget#getStyle |
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119 */ |
5 | 120 public this (Composite parent, int style) { |
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121 super (parent, checkStyle (style)); |
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122 } |
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123 |
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124 /** |
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125 * Adds the listener to the collection of listeners who will |
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126 * be notified when the user changes the receiver's value, by sending |
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127 * it one of the messages defined in the <code>SelectionListener</code> |
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128 * interface. |
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129 * <p> |
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130 * When <code>widgetSelected</code> is called, the event object detail field contains one of the following values: |
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131 * <code>DWT.NONE</code> - for the end of a drag. |
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132 * <code>DWT.DRAG</code>. |
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133 * <code>DWT.HOME</code>. |
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134 * <code>DWT.END</code>. |
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135 * <code>DWT.ARROW_DOWN</code>. |
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136 * <code>DWT.ARROW_UP</code>. |
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137 * <code>DWT.PAGE_DOWN</code>. |
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138 * <code>DWT.PAGE_UP</code>. |
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139 * <code>widgetDefaultSelected</code> is not called. |
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140 * </p> |
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141 * |
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142 * @param listener the listener which should be notified when the user changes the receiver's value |
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143 * |
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144 * @exception IllegalArgumentException <ul> |
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145 * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
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146 * </ul> |
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147 * @exception DWTException <ul> |
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148 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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149 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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150 * </ul> |
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151 * |
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152 * @see SelectionListener |
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153 * @see #removeSelectionListener |
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154 * @see SelectionEvent |
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155 */ |
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156 public void addSelectionListener(SelectionListener listener) { |
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157 checkWidget(); |
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158 if (listener is null) error (DWT.ERROR_NULL_ARGUMENT); |
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159 TypedListener typedListener = new TypedListener(listener); |
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160 addListener(DWT.Selection,typedListener); |
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161 addListener(DWT.DefaultSelection,typedListener); |
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162 } |
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163 |
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164 static int checkStyle (int style) { |
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165 return checkBits (style, DWT.HORIZONTAL, DWT.VERTICAL, 0, 0, 0, 0); |
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166 } |
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167 |
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168 public Point computeSize (int wHint, int hHint, bool changed) { |
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169 checkWidget(); |
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170 int width = 0, height = 0; |
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171 if ((style & DWT.HORIZONTAL) !is 0) { |
7 | 172 height = cast(int)NSScroller.scrollerWidth(); |
0
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173 width = height * 10; |
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174 } else { |
7 | 175 width = cast(int)NSScroller.scrollerWidth(); |
0
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176 height = width * 10; |
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177 } |
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178 if (wHint !is DWT.DEFAULT) width = wHint; |
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179 if (hHint !is DWT.DEFAULT) height = hHint; |
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180 return new Point (width, height); |
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181 } |
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182 |
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183 void createHandle () { |
76 | 184 NSScroller widget = cast(NSScroller)(new SWTScroller()).alloc(); |
46
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185 NSRect rect = NSRect(); |
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186 if ((style & DWT.HORIZONTAL) !is 0) { |
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187 rect.width = 1; |
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188 } else { |
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189 rect.height = 1; |
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190 } |
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191 widget.initWithFrame(rect); |
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192 widget.setEnabled(true); |
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193 widget.setTarget(widget); |
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194 widget.setAction(OS.sel_sendSelection); |
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195 view = widget; |
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196 updateBar(0, minimum, maximum, thumb); |
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197 } |
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198 |
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199 void createWidget () { |
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200 maximum = 100; |
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201 thumb = 10; |
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202 super.createWidget(); |
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203 } |
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204 |
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205 /** |
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206 * Returns the amount that the receiver's value will be |
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207 * modified by when the up/down (or right/left) arrows |
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208 * are pressed. |
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209 * |
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210 * @return the increment |
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211 * |
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212 * @exception DWTException <ul> |
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213 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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214 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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215 * </ul> |
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216 */ |
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217 public int getIncrement () { |
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218 checkWidget(); |
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219 return increment; |
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220 } |
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221 |
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222 /** |
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223 * Returns the maximum value which the receiver will allow. |
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224 * |
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225 * @return the maximum |
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226 * |
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227 * @exception DWTException <ul> |
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228 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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229 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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230 * </ul> |
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231 */ |
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232 public int getMaximum () { |
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233 checkWidget(); |
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234 return maximum; |
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235 } |
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236 |
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237 /** |
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238 * Returns the minimum value which the receiver will allow. |
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239 * |
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240 * @return the minimum |
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241 * |
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242 * @exception DWTException <ul> |
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243 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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244 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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245 * </ul> |
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246 */ |
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247 public int getMinimum () { |
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248 checkWidget(); |
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249 return minimum; |
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250 } |
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251 |
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252 /** |
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253 * Returns the amount that the receiver's value will be |
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254 * modified by when the page increment/decrement areas |
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255 * are selected. |
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256 * |
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257 * @return the page increment |
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258 * |
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259 * @exception DWTException <ul> |
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260 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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261 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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262 * </ul> |
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263 */ |
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264 public int getPageIncrement () { |
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265 checkWidget(); |
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266 return pageIncrement; |
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267 } |
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268 |
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269 /** |
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270 * Returns the 'selection', which is the receiver's value. |
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271 * |
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272 * @return the selection |
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273 * |
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274 * @exception DWTException <ul> |
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275 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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276 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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277 * </ul> |
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278 */ |
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279 public int getSelection () { |
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280 checkWidget(); |
7 | 281 NSScroller widget = cast(NSScroller)view; |
45 | 282 double value = widget.doubleValue(); |
7 | 283 return cast(int)((maximum - thumb - minimum) * value + minimum); |
0
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284 } |
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285 |
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286 /** |
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287 * Returns the size of the receiver's thumb relative to the |
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288 * difference between its maximum and minimum values. |
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289 * |
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290 * @return the thumb value |
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291 * |
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292 * @exception DWTException <ul> |
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293 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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294 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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295 * </ul> |
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296 */ |
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297 public int getThumb () { |
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298 checkWidget(); |
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299 return thumb; |
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300 } |
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301 |
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302 /** |
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303 * Removes the listener from the collection of listeners who will |
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304 * be notified when the user changes the receiver's value. |
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305 * |
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306 * @param listener the listener which should no longer be notified |
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307 * |
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308 * @exception IllegalArgumentException <ul> |
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309 * <li>ERROR_NULL_ARGUMENT - if the listener is null</li> |
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310 * </ul> |
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311 * @exception DWTException <ul> |
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312 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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313 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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314 * </ul> |
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315 * |
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316 * @see SelectionListener |
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317 * @see #addSelectionListener |
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318 */ |
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319 public void removeSelectionListener(SelectionListener listener) { |
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320 checkWidget(); |
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321 if (listener is null) error (DWT.ERROR_NULL_ARGUMENT); |
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322 if (eventTable is null) return; |
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323 eventTable.unhook(DWT.Selection, listener); |
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324 eventTable.unhook(DWT.DefaultSelection,listener); |
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325 } |
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326 |
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327 void sendSelection () { |
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328 Event event = new Event(); |
76 | 329 NSScrollerPart hitPart = (cast(NSScroller)view).hitPart(); |
0
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330 int value = getSelection (); |
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331 switch (hitPart) { |
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332 case OS.NSScrollerDecrementLine: |
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333 event.detail = DWT.ARROW_UP; |
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334 value -= increment; |
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335 break; |
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336 case OS.NSScrollerDecrementPage: |
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337 value -= pageIncrement; |
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338 event.detail = DWT.PAGE_UP; |
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339 break; |
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340 case OS.NSScrollerIncrementLine: |
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341 value += increment; |
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342 event.detail = DWT.PAGE_DOWN; |
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343 break; |
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344 case OS.NSScrollerIncrementPage: |
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345 value += pageIncrement; |
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346 event.detail = DWT.ARROW_DOWN; |
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347 break; |
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348 case OS.NSScrollerKnob: |
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349 event.detail = DWT.DRAG; |
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350 break; |
76 | 351 default: |
0
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352 } |
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353 if (event.detail !is DWT.DRAG) { |
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354 setSelection(value); |
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355 } |
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356 sendEvent(DWT.Selection, event); |
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357 } |
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358 |
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359 /** |
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360 * Sets the amount that the receiver's value will be |
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361 * modified by when the up/down (or right/left) arrows |
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362 * are pressed to the argument, which must be at least |
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363 * one. |
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364 * |
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365 * @param value the new increment (must be greater than zero) |
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366 * |
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367 * @exception DWTException <ul> |
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368 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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369 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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370 * </ul> |
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371 */ |
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372 public void setIncrement (int value) { |
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373 checkWidget(); |
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374 if (value < 1) return; |
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375 increment = value; |
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376 } |
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377 |
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378 /** |
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379 * Sets the maximum. If this value is negative or less than or |
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380 * equal to the minimum, the value is ignored. If necessary, first |
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381 * the thumb and then the selection are adjusted to fit within the |
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382 * new range. |
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383 * |
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384 * @param value the new maximum, which must be greater than the current minimum |
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385 * |
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386 * @exception DWTException <ul> |
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387 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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388 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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389 * </ul> |
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390 */ |
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391 public void setMaximum (int value) { |
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392 checkWidget(); |
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393 if (value < 0) return; |
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394 if (value <= minimum) return; |
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395 if (value - minimum < thumb) { |
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396 thumb = value - minimum; |
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397 } |
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398 int selection = Math.max(minimum, Math.min (getSelection (), value - thumb)); |
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399 this.maximum = value; |
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400 updateBar(selection, minimum, value, thumb); |
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401 } |
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402 |
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403 /** |
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404 * Sets the minimum value. If this value is negative or greater |
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405 * than or equal to the maximum, the value is ignored. If necessary, |
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406 * first the thumb and then the selection are adjusted to fit within |
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407 * the new range. |
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408 * |
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409 * @param value the new minimum |
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410 * |
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411 * @exception DWTException <ul> |
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412 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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413 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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414 * </ul> |
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415 */ |
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416 public void setMinimum (int value) { |
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417 checkWidget(); |
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418 if (value < 0) return; |
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419 if (value >= maximum) return; |
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420 if (maximum - value < thumb) { |
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421 thumb = maximum - value; |
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422 } |
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423 int selection = Math.min(maximum - thumb, Math.max (getSelection (), value)); |
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424 this.minimum = value; |
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425 updateBar(selection, value, maximum, thumb); |
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426 } |
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427 |
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428 /** |
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429 * Sets the amount that the receiver's value will be |
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430 * modified by when the page increment/decrement areas |
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431 * are selected to the argument, which must be at least |
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432 * one. |
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433 * |
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434 * @param value the page increment (must be greater than zero) |
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435 * |
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436 * @exception DWTException <ul> |
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437 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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438 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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439 * </ul> |
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440 */ |
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441 public void setPageIncrement (int value) { |
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442 checkWidget(); |
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443 if (value < 1) return; |
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444 pageIncrement = value; |
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445 } |
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446 |
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447 /** |
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448 * Sets the 'selection', which is the receiver's |
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449 * value, to the argument which must be greater than or equal |
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450 * to zero. |
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451 * |
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452 * @param value the new selection (must be zero or greater) |
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453 * |
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454 * @exception DWTException <ul> |
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455 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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456 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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457 * </ul> |
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458 */ |
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459 public void setSelection (int value) { |
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460 checkWidget(); |
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461 updateBar(value, minimum, maximum, thumb); |
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462 } |
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463 |
45 | 464 void updateBar (int selection, int minimum, int maximum, int thumb) { |
7 | 465 NSScroller widget = cast(NSScroller)view; |
45 | 466 selection = Math.max (minimum, Math.min (maximum - thumb, selection)); |
467 int range = maximum - thumb - minimum; | |
468 float fraction = range <= 0 ? 1 : cast(float)(selection - minimum) / range; | |
469 CGFloat knob = range <= 0 ? 1 : cast(CGFloat)thumb / (maximum - minimum); | |
470 widget.setFloatValue (fraction, knob); | |
0
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471 } |
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472 |
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473 /** |
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474 * Sets the size of the receiver's thumb relative to the |
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475 * difference between its maximum and minimum values. This new |
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476 * value will be ignored if it is less than one, and will be |
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477 * clamped if it exceeds the receiver's current range. |
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478 * |
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479 * @param value the new thumb value, which must be at least one and not |
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480 * larger than the size of the current range |
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481 * |
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482 * @exception DWTException <ul> |
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483 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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484 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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485 * </ul> |
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486 */ |
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487 public void setThumb (int value) { |
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488 checkWidget(); |
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489 if (value < 1) return; |
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490 value = Math.min (value, maximum - minimum); |
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491 this.thumb = value; |
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492 updateBar(getSelection(), minimum, maximum, value); |
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493 } |
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494 |
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495 /** |
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496 * Sets the receiver's selection, minimum value, maximum |
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497 * value, thumb, increment and page increment all at once. |
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498 * <p> |
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499 * Note: This is similar to setting the values individually |
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500 * using the appropriate methods, but may be implemented in a |
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501 * more efficient fashion on some platforms. |
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502 * </p> |
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503 * |
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504 * @param selection the new selection value |
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505 * @param minimum the new minimum value |
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506 * @param maximum the new maximum value |
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507 * @param thumb the new thumb value |
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508 * @param increment the new increment value |
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509 * @param pageIncrement the new pageIncrement value |
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510 * |
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511 * @exception DWTException <ul> |
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512 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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513 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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514 * </ul> |
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515 */ |
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516 public void setValues (int selection, int minimum, int maximum, int thumb, int increment, int pageIncrement) { |
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517 checkWidget(); |
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518 if (minimum < 0) return; |
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519 if (maximum < 0) return; |
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520 if (thumb < 1) return; |
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521 if (increment < 1) return; |
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522 if (pageIncrement < 1) return; |
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523 thumb = Math.min (thumb, maximum - minimum); |
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524 this.increment = increment; |
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525 this.pageIncrement = pageIncrement; |
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526 updateBar(selection, minimum, maximum, thumb); |
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527 } |
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528 |
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529 } |