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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
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10 *******************************************************************************/
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11 module dwt.widgets.ScrollBar;
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12
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13 import dwt.widgets.Control;
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14 import dwt.widgets.Scrollable;
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15 import dwt.internal.gtk.c.gtktypes;
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16
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17 class ScrollBar : Control {
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18 GtkAdjustment* adjustmentHandle;
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19 Scrollable parent;
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20 }
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21
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22 /+
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23 import dwt.SWT;
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24 import dwt.internal.gtk.*;
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25 import dwt.graphics.*;
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26 import dwt.events.*;
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27
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28 /**
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29 * Instances of this class are selectable user interface
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30 * objects that represent a range of positive, numeric values.
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31 * <p>
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32 * At any given moment, a given scroll bar will have a
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33 * single 'selection' that is considered to be its
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34 * value, which is constrained to be within the range of
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35 * values the scroll bar represents (that is, between its
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36 * <em>minimum</em> and <em>maximum</em> values).
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37 * </p><p>
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38 * Typically, scroll bars will be made up of five areas:
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39 * <ol>
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40 * <li>an arrow button for decrementing the value</li>
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41 * <li>a page decrement area for decrementing the value by a larger amount</li>
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42 * <li>a <em>thumb</em> for modifying the value by mouse dragging</li>
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43 * <li>a page increment area for incrementing the value by a larger amount</li>
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44 * <li>an arrow button for incrementing the value</li>
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45 * </ol>
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46 * Based on their style, scroll bars are either <code>HORIZONTAL</code>
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47 * (which have a left facing button for decrementing the value and a
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48 * right facing button for incrementing it) or <code>VERTICAL</code>
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49 * (which have an upward facing button for decrementing the value
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50 * and a downward facing buttons for incrementing it).
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51 * </p><p>
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52 * On some platforms, the size of the scroll bar's thumb can be
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53 * varied relative to the magnitude of the range of values it
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54 * represents (that is, relative to the difference between its
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55 * maximum and minimum values). Typically, this is used to
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56 * indicate some proportional value such as the ratio of the
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57 * visible area of a document to the total amount of space that
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58 * it would take to display it. SWT supports setting the thumb
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59 * size even if the underlying platform does not, but in this
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60 * case the appearance of the scroll bar will not change.
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61 * </p><p>
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62 * Scroll bars are created by specifying either <code>H_SCROLL</code>,
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63 * <code>V_SCROLL</code> or both when creating a <code>Scrollable</code>.
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64 * They are accessed from the <code>Scrollable</code> using
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65 * <code>getHorizontalBar</code> and <code>getVerticalBar</code>.
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66 * </p><p>
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67 * Note: Scroll bars are not Controls. On some platforms, scroll bars
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68 * that appear as part of some standard controls such as a text or list
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69 * have no operating system resources and are not children of the control.
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70 * For this reason, scroll bars are treated specially. To create a control
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71 * that looks like a scroll bar but has operating system resources, use
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72 * <code>Slider</code>.
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73 * </p>
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74 * <dl>
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75 * <dt><b>Styles:</b></dt>
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76 * <dd>HORIZONTAL, VERTICAL</dd>
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77 * <dt><b>Events:</b></dt>
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78 * <dd>Selection</dd>
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79 * </dl>
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80 * <p>
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81 * Note: Only one of the styles HORIZONTAL and VERTICAL may be specified.
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82 * </p><p>
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83 * IMPORTANT: This class is <em>not</em> intended to be subclassed.
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84 * </p>
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85 *
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86 * @see Slider
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87 * @see Scrollable
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88 * @see Scrollable#getHorizontalBar
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89 * @see Scrollable#getVerticalBar
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90 */
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91 public class ScrollBar extends Widget {
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92 Scrollable parent;
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93 int /*long*/ adjustmentHandle;
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94 int detail;
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95 boolean dragSent;
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96
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97 ScrollBar () {
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98 }
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99
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100 /**
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101 * Creates a new instance of the widget.
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102 */
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103 ScrollBar (Scrollable parent, int style) {
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104 super (parent, checkStyle (style));
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105 this.parent = parent;
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106 createWidget (0);
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107 }
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108
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109 /**
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110 * Adds the listener to the collection of listeners who will
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111 * be notified when the user changes the receiver's value, by sending
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112 * it one of the messages defined in the <code>SelectionListener</code>
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113 * interface.
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114 * <p>
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115 * When <code>widgetSelected</code> is called, the event object detail field contains one of the following values:
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116 * <code>SWT.NONE</code> - for the end of a drag.
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117 * <code>SWT.DRAG</code>.
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118 * <code>SWT.HOME</code>.
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119 * <code>SWT.END</code>.
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120 * <code>SWT.ARROW_DOWN</code>.
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121 * <code>SWT.ARROW_UP</code>.
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122 * <code>SWT.PAGE_DOWN</code>.
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123 * <code>SWT.PAGE_UP</code>.
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124 * <code>widgetDefaultSelected</code> is not called.
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125 * </p>
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126 *
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127 * @param listener the listener which should be notified when the user changes the receiver's value
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128 *
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129 * @exception IllegalArgumentException <ul>
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130 * <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
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131 * </ul>
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132 * @exception SWTException <ul>
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133 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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134 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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135 * </ul>
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136 *
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137 * @see SelectionListener
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138 * @see #removeSelectionListener
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139 * @see SelectionEvent
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140 */
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141 public void addSelectionListener (SelectionListener listener) {
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142 checkWidget ();
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143 if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
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144 TypedListener typedListener = new TypedListener (listener);
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145 addListener (SWT.Selection,typedListener);
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146 addListener (SWT.DefaultSelection,typedListener);
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147 }
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148
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149 static int checkStyle (int style) {
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150 return checkBits (style, SWT.HORIZONTAL, SWT.VERTICAL, 0, 0, 0, 0);
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151 }
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152
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153 void deregister () {
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154 super.deregister ();
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155 if (adjustmentHandle != 0) display.removeWidget (adjustmentHandle);
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156 }
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157
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158 /**
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159 * Returns <code>true</code> if the receiver is enabled, and
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160 * <code>false</code> otherwise. A disabled control is typically
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161 * not selectable from the user interface and draws with an
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162 * inactive or "grayed" look.
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163 *
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164 * @return the receiver's enabled state
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165 *
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166 * @exception SWTException <ul>
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167 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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168 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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169 * </ul>
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170 *
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171 * @see #isEnabled
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172 */
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173 public boolean getEnabled () {
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174 checkWidget ();
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175 if (handle != 0) return OS.GTK_WIDGET_SENSITIVE (handle);
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176 return true;
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177 }
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178
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179 /**
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180 * Returns the amount that the receiver's value will be
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181 * modified by when the up/down (or right/left) arrows
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182 * are pressed.
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183 *
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184 * @return the increment
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185 *
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186 * @exception SWTException <ul>
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187 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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188 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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189 * </ul>
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190 */
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191 public int getIncrement () {
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192 checkWidget ();
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193 GtkAdjustment adjustment = new GtkAdjustment ();
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194 OS.memmove (adjustment, adjustmentHandle);
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195 return (int) adjustment.step_increment;
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196 }
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197
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198 /**
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199 * Returns the maximum value which the receiver will allow.
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200 *
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201 * @return the maximum
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202 *
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203 * @exception SWTException <ul>
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204 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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205 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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206 * </ul>
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207 */
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208 public int getMaximum () {
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209 checkWidget ();
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210 GtkAdjustment adjustment = new GtkAdjustment ();
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211 OS.memmove (adjustment, adjustmentHandle);
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212 return (int) adjustment.upper;
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213 }
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214
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215 /**
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216 * Returns the minimum value which the receiver will allow.
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217 *
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218 * @return the minimum
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219 *
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220 * @exception SWTException <ul>
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221 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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222 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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223 * </ul>
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224 */
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225 public int getMinimum () {
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226 checkWidget ();
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227 GtkAdjustment adjustment = new GtkAdjustment ();
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228 OS.memmove (adjustment, adjustmentHandle);
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229 return (int) adjustment.lower;
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230 }
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231
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232 /**
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233 * Returns the amount that the receiver's value will be
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234 * modified by when the page increment/decrement areas
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235 * are selected.
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236 *
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237 * @return the page increment
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238 *
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239 * @exception SWTException <ul>
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240 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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241 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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242 * </ul>
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243 */
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244 public int getPageIncrement () {
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245 checkWidget ();
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246 GtkAdjustment adjustment = new GtkAdjustment ();
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247 OS.memmove (adjustment, adjustmentHandle);
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248 return (int) adjustment.page_increment;
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249 }
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250
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251 /**
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252 * Returns the receiver's parent, which must be a Scrollable.
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253 *
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254 * @return the receiver's parent
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255 *
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256 * @exception SWTException <ul>
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257 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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258 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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259 * </ul>
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260 */
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261 public Scrollable getParent () {
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262 checkWidget ();
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263 return parent;
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264 }
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265
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266 /**
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267 * Returns the single 'selection' that is the receiver's value.
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268 *
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269 * @return the selection
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270 *
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271 * @exception SWTException <ul>
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272 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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273 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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274 * </ul>
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275 */
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276 public int getSelection () {
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277 checkWidget ();
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278 GtkAdjustment adjustment = new GtkAdjustment ();
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279 OS.memmove (adjustment, adjustmentHandle);
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280 return (int) adjustment.value;
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281 }
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282
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283 /**
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284 * Returns a point describing the receiver's size. The
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285 * x coordinate of the result is the width of the receiver.
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286 * The y coordinate of the result is the height of the
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287 * receiver.
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288 *
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289 * @return the receiver's size
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290 *
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291 * @exception SWTException <ul>
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292 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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293 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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294 * </ul>
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295 */
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296 public Point getSize () {
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297 checkWidget ();
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298 if (handle == 0) return new Point (0,0);
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299 GtkRequisition requisition = new GtkRequisition ();
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300 OS.gtk_widget_size_request (handle, requisition);
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301 return new Point (requisition.width, requisition.height);
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302 }
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303
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304 /**
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305 * Returns the size of the receiver's thumb relative to the
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306 * difference between its maximum and minimum values.
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307 *
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308 * @return the thumb value
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309 *
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310 * @exception SWTException <ul>
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311 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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312 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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313 * </ul>
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314 *
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315 * @see ScrollBar
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316 */
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317 public int getThumb () {
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318 checkWidget ();
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319 GtkAdjustment adjustment = new GtkAdjustment ();
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320 OS.memmove (adjustment, adjustmentHandle);
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321 return (int) adjustment.page_size;
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322 }
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323
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324 /**
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325 * Returns <code>true</code> if the receiver is visible, and
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326 * <code>false</code> otherwise.
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327 * <p>
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328 * If one of the receiver's ancestors is not visible or some
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329 * other condition makes the receiver not visible, this method
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330 * may still indicate that it is considered visible even though
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331 * it may not actually be showing.
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332 * </p>
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333 *
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334 * @return the receiver's visibility state
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335 *
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336 * @exception SWTException <ul>
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337 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
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338 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
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339 * </ul>
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340 */
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341 public boolean getVisible () {
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342 checkWidget ();
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343 int /*long*/ scrolledHandle = parent.scrolledHandle;
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344 int [] hsp = new int [1], vsp = new int [1];
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345 OS.gtk_scrolled_window_get_policy (scrolledHandle, hsp, vsp);
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346 if ((style & SWT.HORIZONTAL) != 0) {
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347 return hsp [0] != OS.GTK_POLICY_NEVER;
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348 } else {
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349 return vsp [0] != OS.GTK_POLICY_NEVER;
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350 }
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351 }
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352
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353 int /*long*/ gtk_button_press_event (int /*long*/ widget, int /*long*/ eventPtr) {
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354 int /*long*/ result = super.gtk_button_press_event (widget, eventPtr);
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355 if (result != 0) return result;
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356 detail = OS.GTK_SCROLL_NONE;
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357 dragSent = false;
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358 return result;
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359 }
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360
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361 int /*long*/ gtk_change_value (int /*long*/ widget, int /*long*/ scroll, int /*long*/ value1, int /*long*/ value2) {
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362 detail = (int)/*64*/scroll;
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363 return 0;
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364 }
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365
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366 int /*long*/ gtk_value_changed (int /*long*/ adjustment) {
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367 Event event = new Event ();
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368 dragSent = detail == OS.GTK_SCROLL_JUMP;
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369 switch (detail) {
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370 case OS.GTK_SCROLL_NONE: event.detail = SWT.NONE; break;
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371 case OS.GTK_SCROLL_JUMP: event.detail = SWT.DRAG; break;
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372 case OS.GTK_SCROLL_START: event.detail = SWT.HOME; break;
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373 case OS.GTK_SCROLL_END: event.detail = SWT.END; break;
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374 case OS.GTK_SCROLL_PAGE_DOWN:
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375 case OS.GTK_SCROLL_PAGE_RIGHT:
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376 case OS.GTK_SCROLL_PAGE_FORWARD: event.detail = SWT.PAGE_DOWN; break;
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377 case OS.GTK_SCROLL_PAGE_UP:
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378 case OS.GTK_SCROLL_PAGE_LEFT:
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379 case OS.GTK_SCROLL_PAGE_BACKWARD: event.detail = SWT.PAGE_UP; break;
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380 case OS.GTK_SCROLL_STEP_DOWN:
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381 case OS.GTK_SCROLL_STEP_RIGHT:
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382 case OS.GTK_SCROLL_STEP_FORWARD: event.detail = SWT.ARROW_DOWN; break;
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383 case OS.GTK_SCROLL_STEP_UP:
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384 case OS.GTK_SCROLL_STEP_LEFT:
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385 case OS.GTK_SCROLL_STEP_BACKWARD: event.detail = SWT.ARROW_UP; break;
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386 }
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387 detail = OS.GTK_SCROLL_NONE;
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388 if (!dragSent) detail = OS.GTK_SCROLL_NONE;
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389 postEvent (SWT.Selection, event);
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|
|
390 parent.updateScrollBarValue (this);
|
|
|
391 return 0;
|
|
|
392 }
|
|
|
393
|
|
|
394 int /*long*/ gtk_event_after (int /*long*/ widget, int /*long*/ gdkEvent) {
|
|
|
395 GdkEvent gtkEvent = new GdkEvent ();
|
|
|
396 OS.memmove (gtkEvent, gdkEvent, GdkEvent.sizeof);
|
|
|
397 switch (gtkEvent.type) {
|
|
|
398 case OS.GDK_BUTTON_RELEASE: {
|
|
|
399 GdkEventButton gdkEventButton = new GdkEventButton ();
|
|
|
400 OS.memmove (gdkEventButton, gdkEvent, GdkEventButton.sizeof);
|
|
|
401 if (gdkEventButton.button == 1 && detail == SWT.DRAG) {
|
|
|
402 if (!dragSent) {
|
|
|
403 Event event = new Event ();
|
|
|
404 event.detail = SWT.DRAG;
|
|
|
405 postEvent (SWT.Selection, event);
|
|
|
406 }
|
|
|
407 postEvent (SWT.Selection);
|
|
|
408 }
|
|
|
409 detail = OS.GTK_SCROLL_NONE;
|
|
|
410 dragSent = false;
|
|
|
411 break;
|
|
|
412 }
|
|
|
413 }
|
|
|
414 return super.gtk_event_after (widget, gdkEvent);
|
|
|
415 }
|
|
|
416
|
|
|
417 void hookEvents () {
|
|
|
418 super.hookEvents ();
|
|
|
419 if (OS.GTK_VERSION >= OS.VERSION (2, 6, 0)) {
|
|
|
420 OS.g_signal_connect_closure (handle, OS.change_value, display.closures [CHANGE_VALUE], false);
|
|
|
421 }
|
|
|
422 OS.g_signal_connect_closure (adjustmentHandle, OS.value_changed, display.closures [VALUE_CHANGED], false);
|
|
|
423 OS.g_signal_connect_closure_by_id (handle, display.signalIds [EVENT_AFTER], 0, display.closures [EVENT_AFTER], false);
|
|
|
424 OS.g_signal_connect_closure_by_id (handle, display.signalIds [BUTTON_PRESS_EVENT], 0, display.closures [BUTTON_PRESS_EVENT], false);
|
|
|
425 }
|
|
|
426
|
|
|
427 /**
|
|
|
428 * Returns <code>true</code> if the receiver is enabled and all
|
|
|
429 * of the receiver's ancestors are enabled, and <code>false</code>
|
|
|
430 * otherwise. A disabled control is typically not selectable from the
|
|
|
431 * user interface and draws with an inactive or "grayed" look.
|
|
|
432 *
|
|
|
433 * @return the receiver's enabled state
|
|
|
434 *
|
|
|
435 * @exception SWTException <ul>
|
|
|
436 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
437 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
438 * </ul>
|
|
|
439 *
|
|
|
440 * @see #getEnabled
|
|
|
441 */
|
|
|
442 public boolean isEnabled () {
|
|
|
443 checkWidget ();
|
|
|
444 return getEnabled () && getParent ().getEnabled ();
|
|
|
445 }
|
|
|
446
|
|
|
447 /**
|
|
|
448 * Returns <code>true</code> if the receiver is visible and all
|
|
|
449 * of the receiver's ancestors are visible and <code>false</code>
|
|
|
450 * otherwise.
|
|
|
451 *
|
|
|
452 * @return the receiver's visibility state
|
|
|
453 *
|
|
|
454 * @exception SWTException <ul>
|
|
|
455 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
456 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
457 * </ul>
|
|
|
458 *
|
|
|
459 * @see #getVisible
|
|
|
460 */
|
|
|
461 public boolean isVisible () {
|
|
|
462 checkWidget ();
|
|
|
463 return getVisible () && getParent ().isVisible ();
|
|
|
464 }
|
|
|
465
|
|
|
466 void register () {
|
|
|
467 super.register ();
|
|
|
468 if (adjustmentHandle != 0) display.addWidget (adjustmentHandle, this);
|
|
|
469 }
|
|
|
470
|
|
|
471 void releaseParent () {
|
|
|
472 super.releaseParent ();
|
|
|
473 if (parent.horizontalBar == this) parent.horizontalBar = null;
|
|
|
474 if (parent.verticalBar == this) parent.verticalBar = null;
|
|
|
475 }
|
|
|
476
|
|
|
477 void releaseWidget () {
|
|
|
478 super.releaseWidget ();
|
|
|
479 parent = null;
|
|
|
480 }
|
|
|
481
|
|
|
482 /**
|
|
|
483 * Removes the listener from the collection of listeners who will
|
|
|
484 * be notified when the user changes the receiver's value.
|
|
|
485 *
|
|
|
486 * @param listener the listener which should no longer be notified
|
|
|
487 *
|
|
|
488 * @exception IllegalArgumentException <ul>
|
|
|
489 * <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
|
|
|
490 * </ul>
|
|
|
491 * @exception SWTException <ul>
|
|
|
492 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
493 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
494 * </ul>
|
|
|
495 *
|
|
|
496 * @see SelectionListener
|
|
|
497 * @see #addSelectionListener
|
|
|
498 */
|
|
|
499 public void removeSelectionListener (SelectionListener listener) {
|
|
|
500 checkWidget ();
|
|
|
501 if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
|
|
|
502 if (eventTable == null) return;
|
|
|
503 eventTable.unhook (SWT.Selection, listener);
|
|
|
504 eventTable.unhook (SWT.DefaultSelection,listener);
|
|
|
505 }
|
|
|
506
|
|
|
507 /**
|
|
|
508 * Enables the receiver if the argument is <code>true</code>,
|
|
|
509 * and disables it otherwise. A disabled control is typically
|
|
|
510 * not selectable from the user interface and draws with an
|
|
|
511 * inactive or "grayed" look.
|
|
|
512 *
|
|
|
513 * @param enabled the new enabled state
|
|
|
514 *
|
|
|
515 * @exception SWTException <ul>
|
|
|
516 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
517 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
518 * </ul>
|
|
|
519 */
|
|
|
520 public void setEnabled (boolean enabled) {
|
|
|
521 checkWidget ();
|
|
|
522 if (handle != 0) OS.gtk_widget_set_sensitive (handle, enabled);
|
|
|
523 }
|
|
|
524
|
|
|
525 /**
|
|
|
526 * Sets the amount that the receiver's value will be
|
|
|
527 * modified by when the up/down (or right/left) arrows
|
|
|
528 * are pressed to the argument, which must be at least
|
|
|
529 * one.
|
|
|
530 *
|
|
|
531 * @param value the new increment (must be greater than zero)
|
|
|
532 *
|
|
|
533 * @exception SWTException <ul>
|
|
|
534 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
535 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
536 * </ul>
|
|
|
537 */
|
|
|
538 public void setIncrement (int value) {
|
|
|
539 checkWidget ();
|
|
|
540 if (value < 1) return;
|
|
|
541 GtkAdjustment adjustment = new GtkAdjustment ();
|
|
|
542 OS.memmove (adjustment, adjustmentHandle);
|
|
|
543 adjustment.step_increment = (float) value;
|
|
|
544 OS.memmove (adjustmentHandle, adjustment);
|
|
|
545 OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
546 OS.gtk_adjustment_changed (adjustmentHandle);
|
|
|
547 OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
548 }
|
|
|
549
|
|
|
550 /**
|
|
|
551 * Sets the maximum. If this value is negative or less than or
|
|
|
552 * equal to the minimum, the value is ignored. If necessary, first
|
|
|
553 * the thumb and then the selection are adjusted to fit within the
|
|
|
554 * new range.
|
|
|
555 *
|
|
|
556 * @param value the new maximum
|
|
|
557 *
|
|
|
558 * @exception SWTException <ul>
|
|
|
559 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
560 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
561 * </ul>
|
|
|
562 */
|
|
|
563 public void setMaximum (int value) {
|
|
|
564 checkWidget ();
|
|
|
565 GtkAdjustment adjustment = new GtkAdjustment ();
|
|
|
566 OS.memmove (adjustment, adjustmentHandle);
|
|
|
567 int minimum = (int) adjustment.lower;
|
|
|
568 if (value <= minimum) return;
|
|
|
569 adjustment.upper = value;
|
|
|
570 adjustment.page_size = Math.min ((int)adjustment.page_size, value - minimum);
|
|
|
571 adjustment.value = Math.min ((int)adjustment.value, (int)(value - adjustment.page_size));
|
|
|
572 OS.memmove (adjustmentHandle, adjustment);
|
|
|
573 OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
574 OS.gtk_adjustment_changed (adjustmentHandle);
|
|
|
575 OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
576 }
|
|
|
577
|
|
|
578 /**
|
|
|
579 * Sets the minimum value. If this value is negative or greater
|
|
|
580 * than or equal to the maximum, the value is ignored. If necessary,
|
|
|
581 * first the thumb and then the selection are adjusted to fit within
|
|
|
582 * the new range.
|
|
|
583 *
|
|
|
584 * @param value the new minimum
|
|
|
585 *
|
|
|
586 * @exception SWTException <ul>
|
|
|
587 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
588 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
589 * </ul>
|
|
|
590 */
|
|
|
591 public void setMinimum (int value) {
|
|
|
592 checkWidget ();
|
|
|
593 if (value < 0) return;
|
|
|
594 GtkAdjustment adjustment = new GtkAdjustment ();
|
|
|
595 OS.memmove (adjustment, adjustmentHandle);
|
|
|
596 int maximum = (int) adjustment.upper;
|
|
|
597 if (value >= maximum) return;
|
|
|
598 adjustment.lower = value;
|
|
|
599 adjustment.page_size = Math.min ((int)adjustment.page_size, maximum - value);
|
|
|
600 adjustment.value = Math.max ((int)adjustment.value, value);
|
|
|
601 OS.memmove (adjustmentHandle, adjustment);
|
|
|
602 OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
603 OS.gtk_adjustment_changed (adjustmentHandle);
|
|
|
604 OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
605 }
|
|
|
606
|
|
|
607 /**
|
|
|
608 * Sets the amount that the receiver's value will be
|
|
|
609 * modified by when the page increment/decrement areas
|
|
|
610 * are selected to the argument, which must be at least
|
|
|
611 * one.
|
|
|
612 *
|
|
|
613 * @param value the page increment (must be greater than zero)
|
|
|
614 *
|
|
|
615 * @exception SWTException <ul>
|
|
|
616 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
617 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
618 * </ul>
|
|
|
619 */
|
|
|
620 public void setPageIncrement (int value) {
|
|
|
621 checkWidget ();
|
|
|
622 if (value < 1) return;
|
|
|
623 GtkAdjustment adjustment = new GtkAdjustment ();
|
|
|
624 OS.memmove (adjustment, adjustmentHandle);
|
|
|
625 adjustment.page_increment = (float) value;
|
|
|
626 OS.memmove (adjustmentHandle, adjustment);
|
|
|
627 OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
628 OS.gtk_adjustment_changed (adjustmentHandle);
|
|
|
629 OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
630 }
|
|
|
631
|
|
|
632 /**
|
|
|
633 * Sets the single <em>selection</em> that is the receiver's
|
|
|
634 * value to the argument which must be greater than or equal
|
|
|
635 * to zero.
|
|
|
636 *
|
|
|
637 * @param selection the new selection (must be zero or greater)
|
|
|
638 *
|
|
|
639 * @exception SWTException <ul>
|
|
|
640 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
641 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
642 * </ul>
|
|
|
643 */
|
|
|
644 public void setSelection (int value) {
|
|
|
645 checkWidget ();
|
|
|
646 value = Math.min (value, getMaximum() - getThumb());
|
|
|
647 OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
648 OS.gtk_adjustment_set_value (adjustmentHandle, value);
|
|
|
649 OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
650 }
|
|
|
651
|
|
|
652 /**
|
|
|
653 * Sets the size of the receiver's thumb relative to the
|
|
|
654 * difference between its maximum and minimum values. This new
|
|
|
655 * value will be ignored if it is less than one, and will be
|
|
|
656 * clamped if it exceeds the receiver's current range.
|
|
|
657 *
|
|
|
658 * @param value the new thumb value, which must be at least one and not
|
|
|
659 * larger than the size of the current range
|
|
|
660 *
|
|
|
661 * @exception SWTException <ul>
|
|
|
662 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
663 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
664 * </ul>
|
|
|
665 */
|
|
|
666 public void setThumb (int value) {
|
|
|
667 checkWidget ();
|
|
|
668 if (value < 1) return;
|
|
|
669 GtkAdjustment adjustment = new GtkAdjustment ();
|
|
|
670 OS.memmove (adjustment, adjustmentHandle);
|
|
|
671 value = (int) Math.min (value, (int)(adjustment.upper - adjustment.lower));
|
|
|
672 adjustment.page_size = (double) value;
|
|
|
673 adjustment.value = Math.min ((int)adjustment.value, (int)(adjustment.upper - value));
|
|
|
674 OS.memmove (adjustmentHandle, adjustment);
|
|
|
675 OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
676 OS.gtk_adjustment_changed (adjustmentHandle);
|
|
|
677 OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
678 }
|
|
|
679
|
|
|
680 /**
|
|
|
681 * Sets the receiver's selection, minimum value, maximum
|
|
|
682 * value, thumb, increment and page increment all at once.
|
|
|
683 * <p>
|
|
|
684 * Note: This is similar to setting the values individually
|
|
|
685 * using the appropriate methods, but may be implemented in a
|
|
|
686 * more efficient fashion on some platforms.
|
|
|
687 * </p>
|
|
|
688 *
|
|
|
689 * @param selection the new selection value
|
|
|
690 * @param minimum the new minimum value
|
|
|
691 * @param maximum the new maximum value
|
|
|
692 * @param thumb the new thumb value
|
|
|
693 * @param increment the new increment value
|
|
|
694 * @param pageIncrement the new pageIncrement value
|
|
|
695 *
|
|
|
696 * @exception SWTException <ul>
|
|
|
697 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
698 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
699 * </ul>
|
|
|
700 */
|
|
|
701 public void setValues (int selection, int minimum, int maximum, int thumb, int increment, int pageIncrement) {
|
|
|
702 checkWidget ();
|
|
|
703 if (minimum < 0) return;
|
|
|
704 if (maximum < 0) return;
|
|
|
705 if (thumb < 1) return;
|
|
|
706 if (increment < 1) return;
|
|
|
707 if (pageIncrement < 1) return;
|
|
|
708 thumb = Math.min (thumb, maximum - minimum);
|
|
|
709 GtkAdjustment adjustment = new GtkAdjustment ();
|
|
|
710 OS.memmove (adjustment, adjustmentHandle);
|
|
|
711 adjustment.lower = minimum;
|
|
|
712 adjustment.upper = maximum;
|
|
|
713 adjustment.step_increment = increment;
|
|
|
714 adjustment.page_increment = pageIncrement;
|
|
|
715 adjustment.page_size = thumb;
|
|
|
716 adjustment.value = Math.min (Math.max (selection, minimum), maximum - thumb);
|
|
|
717 OS.memmove (adjustmentHandle, adjustment);
|
|
|
718 OS.g_signal_handlers_block_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
719 OS.gtk_adjustment_changed (adjustmentHandle);
|
|
|
720 OS.gtk_adjustment_value_changed (adjustmentHandle);
|
|
|
721 OS.g_signal_handlers_unblock_matched (adjustmentHandle, OS.G_SIGNAL_MATCH_DATA, 0, 0, 0, 0, VALUE_CHANGED);
|
|
|
722 }
|
|
|
723
|
|
|
724 /**
|
|
|
725 * Marks the receiver as visible if the argument is <code>true</code>,
|
|
|
726 * and marks it invisible otherwise.
|
|
|
727 * <p>
|
|
|
728 * If one of the receiver's ancestors is not visible or some
|
|
|
729 * other condition makes the receiver not visible, marking
|
|
|
730 * it visible may not actually cause it to be displayed.
|
|
|
731 * </p>
|
|
|
732 *
|
|
|
733 * @param visible the new visibility state
|
|
|
734 *
|
|
|
735 * @exception SWTException <ul>
|
|
|
736 * <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
|
|
|
737 * <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
|
|
|
738 * </ul>
|
|
|
739 */
|
|
|
740 public void setVisible (boolean visible) {
|
|
|
741 checkWidget ();
|
|
|
742 parent.setScrollBarVisible (this, visible);
|
|
|
743 }
|
|
|
744
|
|
|
745 }
|
|
|
746 +/ |
