Mercurial > projects > dwt-win
annotate dwt/widgets/Scrollable.d @ 212:ab60f3309436
reverted the char[] to String and use the an alias.
author | Frank Benoit <benoit@tionex.de> |
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date | Mon, 05 May 2008 00:12:38 +0200 |
parents | 6f75fdfa1bcd |
children | 36f5cb12e1a2 |
rev | line source |
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92c102dd64a3
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2007 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 |
77 | 10 * Port to the D programming language: |
11 * Frank Benoit <benoit@tionex.de> | |
31
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12 *******************************************************************************/ |
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13 module dwt.widgets.Scrollable; |
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14 |
36 | 15 import dwt.widgets.Widget; |
16 import dwt.widgets.Event; | |
31
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17 import dwt.widgets.Control; |
36 | 18 import dwt.widgets.ScrollBar; |
31
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19 import dwt.widgets.Composite; |
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20 import dwt.DWT; |
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21 import dwt.DWTException; |
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22 import dwt.graphics.Rectangle; |
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23 import dwt.internal.win32.OS; |
36 | 24 |
25 import dwt.dwthelper.utils; | |
104 | 26 import tango.util.log.Trace; |
27 void trc( long line ){ | |
28 //Trace.formatln( "Scrollable {}", line ); | |
29 } | |
31
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30 |
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31 /** |
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32 * This class is the abstract superclass of all classes which |
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33 * represent controls that have standard scroll bars. |
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34 * <dl> |
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35 * <dt><b>Styles:</b></dt> |
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36 * <dd>H_SCROLL, V_SCROLL</dd> |
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37 * <dt><b>Events:</b> |
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38 * <dd>(none)</dd> |
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39 * </dl> |
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40 * <p> |
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41 * IMPORTANT: This class is intended to be subclassed <em>only</em> |
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42 * within the DWT implementation. |
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43 * </p> |
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44 */ |
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45 |
36 | 46 public abstract class Scrollable : Control { |
38 | 47 |
48 alias Control.windowProc windowProc; | |
49 | |
31
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50 ScrollBar horizontalBar, verticalBar; |
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51 |
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52 /** |
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53 * Prevents uninitialized instances from being created outside the package. |
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54 */ |
36 | 55 this () { |
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56 } |
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57 |
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58 /** |
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59 * Constructs a new instance of this class given its parent |
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60 * and a style value describing its behavior and appearance. |
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61 * <p> |
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62 * The style value is either one of the style constants defined in |
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63 * class <code>DWT</code> which is applicable to instances of this |
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64 * class, or must be built by <em>bitwise OR</em>'ing together |
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65 * (that is, using the <code>int</code> "|" operator) two or more |
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66 * of those <code>DWT</code> style constants. The class description |
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67 * lists the style constants that are applicable to the class. |
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68 * Style bits are also inherited from superclasses. |
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69 * </p> |
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70 * |
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71 * @param parent a composite control which will be the parent of the new instance (cannot be null) |
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72 * @param style the style of control to construct |
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73 * |
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74 * @exception IllegalArgumentException <ul> |
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75 * <li>ERROR_NULL_ARGUMENT - if the parent is null</li> |
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76 * </ul> |
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77 * @exception DWTException <ul> |
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78 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the parent</li> |
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79 * <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li> |
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80 * </ul> |
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81 * |
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82 * @see DWT#H_SCROLL |
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83 * @see DWT#V_SCROLL |
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84 * @see Widget#checkSubclass |
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85 * @see Widget#getStyle |
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86 */ |
36 | 87 public this (Composite parent, int style) { |
31
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88 super (parent, style); |
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89 } |
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90 |
108
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91 override int callWindowProc (HWND hwnd, int msg, int wParam, int lParam) { |
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92 if (handle is null) return 0; |
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93 return OS.DefWindowProc (hwnd, msg, wParam, lParam); |
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94 } |
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95 |
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96 /** |
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97 * Given a desired <em>client area</em> for the receiver |
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98 * (as described by the arguments), returns the bounding |
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99 * rectangle which would be required to produce that client |
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100 * area. |
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101 * <p> |
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102 * In other words, it returns a rectangle such that, if the |
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103 * receiver's bounds were set to that rectangle, the area |
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104 * of the receiver which is capable of displaying data |
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105 * (that is, not covered by the "trimmings") would be the |
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106 * rectangle described by the arguments (relative to the |
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107 * receiver's parent). |
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108 * </p> |
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109 * |
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110 * @param x the desired x coordinate of the client area |
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111 * @param y the desired y coordinate of the client area |
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112 * @param width the desired width of the client area |
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113 * @param height the desired height of the client area |
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114 * @return the required bounds to produce the given client area |
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115 * |
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116 * @exception DWTException <ul> |
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117 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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118 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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119 * </ul> |
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120 * |
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121 * @see #getClientArea |
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122 */ |
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123 public Rectangle computeTrim (int x, int y, int width, int height) { |
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124 checkWidget (); |
36 | 125 auto scrolledHandle_ = scrolledHandle (); |
126 RECT rect; | |
127 OS.SetRect (&rect, x, y, x + width, y + height); | |
128 int bits1 = OS.GetWindowLong (scrolledHandle_, OS.GWL_STYLE); | |
129 int bits2 = OS.GetWindowLong (scrolledHandle_, OS.GWL_EXSTYLE); | |
130 OS.AdjustWindowRectEx (&rect, bits1, false, bits2); | |
31
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131 if (horizontalBar !is null) rect.bottom += OS.GetSystemMetrics (OS.SM_CYHSCROLL); |
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132 if (verticalBar !is null) rect.right += OS.GetSystemMetrics (OS.SM_CXVSCROLL); |
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133 int nWidth = rect.right - rect.left, nHeight = rect.bottom - rect.top; |
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134 return new Rectangle (rect.left, rect.top, nWidth, nHeight); |
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135 } |
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136 |
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137 ScrollBar createScrollBar (int type) { |
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138 ScrollBar bar = new ScrollBar (this, type); |
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139 if ((state & CANVAS) !is 0) { |
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140 bar.setMaximum (100); |
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141 bar.setThumb (10); |
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142 } |
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143 return bar; |
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144 } |
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145 |
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146 override void createWidget () { |
31
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147 super.createWidget (); |
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148 if ((style & DWT.H_SCROLL) !is 0) horizontalBar = createScrollBar (DWT.H_SCROLL); |
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149 if ((style & DWT.V_SCROLL) !is 0) verticalBar = createScrollBar (DWT.V_SCROLL); |
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150 } |
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151 |
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152 /** |
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153 * Returns a rectangle which describes the area of the |
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154 * receiver which is capable of displaying data (that is, |
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155 * not covered by the "trimmings"). |
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156 * |
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157 * @return the client area |
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158 * |
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159 * @exception DWTException <ul> |
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160 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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161 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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162 * </ul> |
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163 * |
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164 * @see #computeTrim |
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165 */ |
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166 public Rectangle getClientArea () { |
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167 checkWidget (); |
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168 forceResize (); |
36 | 169 RECT rect; |
170 auto scrolledHandle_ = scrolledHandle (); | |
171 OS.GetClientRect (scrolledHandle_, &rect); | |
31
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172 int x = rect.left, y = rect.top; |
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173 int width = rect.right - rect.left; |
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174 int height = rect.bottom - rect.top; |
36 | 175 if (scrolledHandle_ !is handle) { |
176 OS.GetClientRect (handle, &rect); | |
177 OS.MapWindowPoints(handle, scrolledHandle_, cast(POINT*)&rect, 2); | |
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178 x = -rect.left; |
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179 y = -rect.top; |
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180 } |
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181 return new Rectangle (x, y, width, height); |
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182 } |
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183 |
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184 /** |
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185 * Returns the receiver's horizontal scroll bar if it has |
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186 * one, and null if it does not. |
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187 * |
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188 * @return the horizontal scroll bar (or null) |
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189 * |
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190 * @exception DWTException <ul> |
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191 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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192 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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193 * </ul> |
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194 */ |
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195 public ScrollBar getHorizontalBar () { |
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196 checkWidget (); |
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197 return horizontalBar; |
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198 } |
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199 |
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200 /** |
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201 * Returns the receiver's vertical scroll bar if it has |
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202 * one, and null if it does not. |
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203 * |
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204 * @return the vertical scroll bar (or null) |
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205 * |
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206 * @exception DWTException <ul> |
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207 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li> |
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208 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> |
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209 * </ul> |
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210 */ |
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211 public ScrollBar getVerticalBar () { |
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212 checkWidget (); |
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213 return verticalBar; |
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214 } |
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215 |
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216 override void releaseChildren (bool destroy) { |
31
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217 if (horizontalBar !is null) { |
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218 horizontalBar.release (false); |
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219 horizontalBar = null; |
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220 } |
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221 if (verticalBar !is null) { |
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222 verticalBar.release (false); |
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223 verticalBar = null; |
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224 } |
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225 super.releaseChildren (destroy); |
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226 } |
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227 |
36 | 228 HANDLE scrolledHandle () { |
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229 return handle; |
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230 } |
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231 |
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232 override int widgetExtStyle () { |
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233 return super.widgetExtStyle (); |
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234 /* |
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235 * This code is intentionally commented. In future, |
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236 * we may wish to support different standard Windows |
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237 * edge styles. The issue here is that not all of |
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238 * these styles are available on the other platforms |
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239 * this would need to be a hint. |
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240 */ |
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241 // if ((style & DWT.BORDER) !is 0) return OS.WS_EX_CLIENTEDGE; |
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242 // if ((style & DWT.SHADOW_IN) !is 0) return OS.WS_EX_STATICEDGE; |
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243 // return super.widgetExtStyle (); |
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244 } |
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245 |
54
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246 override int widgetStyle () { |
31
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247 int bits = super.widgetStyle () | OS.WS_TABSTOP; |
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248 if ((style & DWT.H_SCROLL) !is 0) bits |= OS.WS_HSCROLL; |
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249 if ((style & DWT.V_SCROLL) !is 0) bits |= OS.WS_VSCROLL; |
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250 return bits; |
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251 } |
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252 |
212
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reverted the char[] to String and use the an alias.
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253 override String windowClass () { |
36 | 254 return display.windowClass(); |
31
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255 } |
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256 |
36 | 257 override int windowProc () { |
31
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258 return display.windowProc; |
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259 } |
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260 |
36 | 261 override LRESULT WM_HSCROLL (int wParam, int lParam) { |
104 | 262 trc(__LINE__); |
31
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263 LRESULT result = super.WM_HSCROLL (wParam, lParam); |
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264 if (result !is null) return result; |
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265 |
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266 /* |
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267 * Bug on WinCE. lParam should be NULL when the message is not sent |
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268 * by a scroll bar control, but it contains the handle to the window. |
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269 * When the message is sent by a scroll bar control, it correctly |
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270 * contains the handle to the scroll bar. The fix is to check for |
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271 * both. |
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272 */ |
36 | 273 if (horizontalBar !is null && (lParam is 0 || lParam is cast(int)handle)) { |
31
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274 return wmScroll (horizontalBar, (state & CANVAS) !is 0, handle, OS.WM_HSCROLL, wParam, lParam); |
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275 } |
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276 return result; |
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277 } |
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278 |
36 | 279 override LRESULT WM_MOUSEWHEEL (int wParam, int lParam) { |
104 | 280 trc(__LINE__); |
31
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281 LRESULT result = super.WM_MOUSEWHEEL (wParam, lParam); |
108
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282 if (result !is null) return result; |
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283 |
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284 /* |
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285 * Translate WM_MOUSEWHEEL to WM_VSCROLL or WM_HSCROLL. |
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286 */ |
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287 if ((state & CANVAS) !is 0) { |
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288 if ((wParam & (OS.MK_SHIFT | OS.MK_CONTROL)) !is 0) return result; |
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289 bool vertical = verticalBar !is null && verticalBar.getEnabled (); |
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290 bool horizontal = horizontalBar !is null && horizontalBar.getEnabled (); |
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291 int msg = (vertical) ? OS.WM_VSCROLL : (horizontal) ? OS.WM_HSCROLL : 0; |
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292 if (msg is 0) return result; |
36 | 293 int value; |
294 OS.SystemParametersInfo (OS.SPI_GETWHEELSCROLLLINES, 0, &value, 0); | |
295 int delta = cast(short) (wParam >> 16); | |
31
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296 int code = 0, count = 0; |
36 | 297 if (value is OS.WHEEL_PAGESCROLL) { |
31
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298 code = delta < 0 ? OS.SB_PAGEDOWN : OS.SB_PAGEUP; |
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299 count = Math.abs (delta / OS.WHEEL_DELTA); |
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300 } else { |
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301 code = delta < 0 ? OS.SB_LINEDOWN : OS.SB_LINEUP; |
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302 delta = Math.abs (delta); |
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303 if (delta < OS.WHEEL_DELTA) return result; |
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304 if (msg is OS.WM_VSCROLL) { |
36 | 305 count = value * delta / OS.WHEEL_DELTA; |
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306 } else { |
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307 count = delta / OS.WHEEL_DELTA; |
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308 } |
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309 } |
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310 for (int i=0; i<count; i++) { |
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311 OS.SendMessage (handle, msg, code, 0); |
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312 } |
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313 return LRESULT.ZERO; |
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314 } |
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315 |
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316 /* |
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317 * When the native widget scrolls inside WM_MOUSEWHEEL, it |
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318 * may or may not send a WM_VSCROLL or WM_HSCROLL to do the |
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319 * actual scrolling. This depends on the implementation of |
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320 * each native widget. In order to ensure that application |
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321 * code is notified when the scroll bar moves, compare the |
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322 * scroll bar position before and after the WM_MOUSEWHEEL. |
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323 * If the native control sends a WM_VSCROLL or WM_HSCROLL, |
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324 * then the application has already been notified. If not |
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325 * explicitly send the event. |
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326 */ |
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327 int vPosition = verticalBar is null ? 0 : verticalBar.getSelection (); |
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328 int hPosition = horizontalBar is null ? 0 : horizontalBar.getSelection (); |
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329 int code = callWindowProc (handle, OS.WM_MOUSEWHEEL, wParam, lParam); |
31
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330 if (verticalBar !is null) { |
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331 int position = verticalBar.getSelection (); |
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332 if (position !is vPosition) { |
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333 Event event = new Event (); |
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334 event.detail = position < vPosition ? DWT.PAGE_UP : DWT.PAGE_DOWN; |
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335 verticalBar.sendEvent (DWT.Selection, event); |
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336 } |
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337 } |
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338 if (horizontalBar !is null) { |
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339 int position = horizontalBar.getSelection (); |
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340 if (position !is hPosition) { |
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341 Event event = new Event (); |
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342 event.detail = position < hPosition ? DWT.PAGE_UP : DWT.PAGE_DOWN; |
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343 horizontalBar.sendEvent (DWT.Selection, event); |
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344 } |
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345 } |
108
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346 return new LRESULT (code); |
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347 } |
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348 |
36 | 349 override LRESULT WM_SIZE (int wParam, int lParam) { |
104 | 350 trc(__LINE__); |
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351 int code = callWindowProc (handle, OS.WM_SIZE, wParam, lParam); |
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352 super.WM_SIZE (wParam, lParam); |
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353 // widget may be disposed at this point |
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354 if (code is 0) return LRESULT.ZERO; |
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355 return new LRESULT (code); |
31
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356 } |
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357 |
36 | 358 override LRESULT WM_VSCROLL (int wParam, int lParam) { |
104 | 359 trc(__LINE__); |
31
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360 LRESULT result = super.WM_VSCROLL (wParam, lParam); |
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361 if (result !is null) return result; |
31
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362 /* |
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363 * Bug on WinCE. lParam should be NULL when the message is not sent |
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364 * by a scroll bar control, but it contains the handle to the window. |
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365 * When the message is sent by a scroll bar control, it correctly |
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366 * contains the handle to the scroll bar. The fix is to check for |
92c102dd64a3
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367 * both. |
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368 */ |
36 | 369 if (verticalBar !is null && (lParam is 0 || lParam is cast(int)handle)) { |
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370 return wmScroll (verticalBar, (state & CANVAS) !is 0, handle, OS.WM_VSCROLL, wParam, lParam); |
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371 } |
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372 return result; |
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373 } |
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374 |
36 | 375 LRESULT wmScroll (ScrollBar bar, bool update, HWND hwnd, int msg, int wParam, int lParam) { |
104 | 376 trc(__LINE__); |
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377 LRESULT result = null; |
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378 if (update) { |
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379 int type = msg is OS.WM_HSCROLL ? OS.SB_HORZ : OS.SB_VERT; |
36 | 380 SCROLLINFO info; |
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381 info.cbSize = SCROLLINFO.sizeof; |
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382 info.fMask = OS.SIF_TRACKPOS | OS.SIF_POS | OS.SIF_RANGE; |
36 | 383 OS.GetScrollInfo (hwnd, type, &info); |
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384 info.fMask = OS.SIF_POS; |
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385 int code = wParam & 0xFFFF; |
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386 switch (code) { |
108
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387 case OS.SB_ENDSCROLL: return null; |
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388 case OS.SB_THUMBPOSITION: |
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389 case OS.SB_THUMBTRACK: |
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390 /* |
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391 * Note: On WinCE, the value in SB_THUMBPOSITION is relative to nMin. |
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392 * Same for SB_THUMBPOSITION 'except' for the very first thumb track |
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393 * message which has the actual value of nMin. This is a problem when |
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394 * nMin is not zero. |
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395 */ |
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396 info.nPos = info.nTrackPos; |
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397 break; |
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398 case OS.SB_TOP: |
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399 info.nPos = info.nMin; |
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400 break; |
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401 case OS.SB_BOTTOM: |
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402 info.nPos = info.nMax; |
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403 break; |
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404 case OS.SB_LINEDOWN: |
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405 info.nPos += bar.getIncrement (); |
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406 break; |
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407 case OS.SB_LINEUP: |
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408 int increment = bar.getIncrement (); |
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409 info.nPos = Math.max (info.nMin, info.nPos - increment); |
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410 break; |
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411 case OS.SB_PAGEDOWN: |
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412 info.nPos += bar.getPageIncrement (); |
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413 break; |
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414 case OS.SB_PAGEUP: |
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415 int pageIncrement = bar.getPageIncrement (); |
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416 info.nPos = Math.max (info.nMin, info.nPos - pageIncrement); |
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417 break; |
82 | 418 default: |
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419 } |
36 | 420 OS.SetScrollInfo (hwnd, type, &info, true); |
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421 } else { |
108
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422 int code = callWindowProc (hwnd, msg, wParam, lParam); |
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423 result = code is 0 ? LRESULT.ZERO : new LRESULT (code); |
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424 } |
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425 bar.wmScrollChild (wParam, lParam); |
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426 return result; |
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427 } |
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428 |
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429 } |
36 | 430 |