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annotate dwt/custom/ControlEditor.d @ 13:f565d3a95c0a

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Ported dwt.internal
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Fri, 22 Aug 2008 16:46:34 +0200
parents 380af2bdd8e5
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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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f565d3a95c0a Ported dwt.internal
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11 * Port to the D programming language:
0
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.custom.ControlEditor;
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15
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16 import Math = tango.math.Math;
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17
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18 import dwt.DWT;
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19 import dwt.graphics.Rectangle;
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20 import dwt.widgets.Composite;
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21 import dwt.widgets.Control;
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22 import dwt.widgets.Event;
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23 import dwt.widgets.Listener;
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24 import dwt.widgets.ScrollBar;
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25
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26 /**
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27 *
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28 * A ControlEditor is a manager for a Control that appears above a composite and tracks with the
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29 * moving and resizing of that composite. It can be used to display one control above
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30 * another control. This could be used when editing a control that does not have editing
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31 * capabilities by using a text editor or for launching a dialog by placing a button
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32 * above a control.
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33 *
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34 * <p> Here is an example of using a ControlEditor:
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35 *
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36 * <code><pre>
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37 * Canvas canvas = new Canvas(shell, DWT.BORDER);
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38 * canvas.setBounds(10, 10, 300, 300);
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39 * Color color = new Color(null, 255, 0, 0);
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40 * canvas.setBackground(color);
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41 * ControlEditor editor = new ControlEditor (canvas);
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42 * // The editor will be a button in the bottom right corner of the canvas.
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43 * // When selected, it will launch a Color dialog that will change the background
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44 * // of the canvas.
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45 * Button button = new Button(canvas, DWT.PUSH);
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46 * button.setText("Select Color...");
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47 * button.addSelectionListener (new SelectionAdapter() {
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48 * public void widgetSelected(SelectionEvent e) {
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49 * ColorDialog dialog = new ColorDialog(shell);
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50 * dialog.open();
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51 * RGB rgb = dialog.getRGB();
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52 * if (rgb !is null) {
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53 * if (color !is null) color.dispose();
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54 * color = new Color(null, rgb);
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55 * canvas.setBackground(color);
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56 * }
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57 *
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58 * }
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59 * });
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60 *
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61 * editor.horizontalAlignment = DWT.RIGHT;
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62 * editor.verticalAlignment = DWT.BOTTOM;
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63 * editor.grabHorizontal = false;
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64 * editor.grabVertical = false;
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65 * Point size = button.computeSize(DWT.DEFAULT, DWT.DEFAULT);
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66 * editor.minimumWidth = size.x;
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67 * editor.minimumHeight = size.y;
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68 * editor.setEditor (button);
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69 * </pre></code>
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70 */
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71 public class ControlEditor {
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72
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73 /**
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74 * Specifies how the editor should be aligned relative to the control. Allowed values
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75 * are DWT.LEFT, DWT.RIGHT and DWT.CENTER. The default value is DWT.CENTER.
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76 */
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77 public int horizontalAlignment = DWT.CENTER;
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78
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79 /**
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80 * Specifies whether the editor should be sized to use the entire width of the control.
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81 * True means resize the editor to the same width as the cell. False means do not adjust
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82 * the width of the editor. The default value is false.
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83 */
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84 public bool grabHorizontal = false;
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85
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86 /**
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87 * Specifies the minimum width the editor can have. This is used in association with
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88 * a true value of grabHorizontal. If the cell becomes smaller than the minimumWidth, the
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89 * editor will not made smaller than the minimum width value. The default value is 0.
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90 */
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91 public int minimumWidth = 0;
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92
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93 /**
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94 * Specifies how the editor should be aligned relative to the control. Allowed values
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95 * are DWT.TOP, DWT.BOTTOM and DWT.CENTER. The default value is DWT.CENTER.
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96 */
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97 public int verticalAlignment = DWT.CENTER;
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98
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99 /**
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100 * Specifies whether the editor should be sized to use the entire height of the control.
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101 * True means resize the editor to the same height as the underlying control. False means do not adjust
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102 * the height of the editor. The default value is false.
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103 */
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104 public bool grabVertical = false;
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105
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106 /**
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107 * Specifies the minimum height the editor can have. This is used in association with
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108 * a true value of grabVertical. If the control becomes smaller than the minimumHeight, the
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109 * editor will not made smaller than the minimum height value. The default value is 0.
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110 */
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111 public int minimumHeight = 0;
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112
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113 Composite parent;
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114 Control editor;
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115 private bool hadFocus;
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116 private Listener controlListener;
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117 private Listener scrollbarListener;
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118
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119 private const static int[] EVENTS = [DWT.KeyDown, DWT.KeyUp, DWT.MouseDown, DWT.MouseUp, DWT.Resize];
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120
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121 /**
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122 * Creates a ControlEditor for the specified Composite.
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123 *
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124 * @param parent the Composite above which this editor will be displayed
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125 *
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126 */
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127 public this (Composite parent) {
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128 this.parent = parent;
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129
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130 controlListener = new class Listener {
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131 public void handleEvent (Event e) {
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132 layout();
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133 }
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134 };
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135 for (int i = 0; i < EVENTS.length; i++) {
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136 parent.addListener(EVENTS[i], controlListener);
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137 }
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138
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139 scrollbarListener = new class Listener {
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140 public void handleEvent (Event e) {
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141 scroll(e);
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142 }
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143 };
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144 ScrollBar hBar = parent.getHorizontalBar();
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145 if (hBar !is null)
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146 hBar.addListener(DWT.Selection, scrollbarListener);
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147 ScrollBar vBar = parent.getVerticalBar();
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148 if (vBar !is null)
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149 vBar.addListener(DWT.Selection, scrollbarListener);
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150 }
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151
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152 Rectangle computeBounds () {
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153 Rectangle clientArea = parent.getClientArea();
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154 Rectangle editorRect = new Rectangle(clientArea.x, clientArea.y, minimumWidth, minimumHeight);
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155
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156 if (grabHorizontal)
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157 editorRect.width = Math.max(clientArea.width, minimumWidth);
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158
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159 if (grabVertical)
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160 editorRect.height = Math.max(clientArea.height, minimumHeight);
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161
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162 switch (horizontalAlignment) {
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163 case DWT.RIGHT:
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164 editorRect.x += clientArea.width - editorRect.width;
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165 break;
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166 case DWT.LEFT:
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167 // do nothing - clientArea.x is the right answer
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168 break;
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169 default:
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170 // default is CENTER
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171 editorRect.x += (clientArea.width - editorRect.width) / 2;
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172 }
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173
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174 switch (verticalAlignment) {
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175 case DWT.BOTTOM:
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176 editorRect.y += clientArea.height - editorRect.height;
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177 break;
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178 case DWT.TOP:
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179 // do nothing - clientArea.y is the right answer
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180 break;
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181 default:
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182 // default is CENTER
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183 editorRect.y += (clientArea.height - editorRect.height) / 2;
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184 }
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185
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186 return editorRect;
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187
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188 }
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189
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190 /**
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191 * Removes all associations between the Editor and the underlying composite. The
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192 * composite and the editor Control are <b>not</b> disposed.
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193 */
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194 public void dispose () {
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195 if (parent !is null && !parent.isDisposed()) {
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196 for (int i = 0; i < EVENTS.length; i++) {
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197 parent.removeListener(EVENTS[i], controlListener);
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198 }
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199 ScrollBar hBar = parent.getHorizontalBar();
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200 if (hBar !is null)
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201 hBar.removeListener(DWT.Selection, scrollbarListener);
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202 ScrollBar vBar = parent.getVerticalBar();
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203 if (vBar !is null)
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204 vBar.removeListener(DWT.Selection, scrollbarListener);
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205 }
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206
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207 parent = null;
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208 editor = null;
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209 hadFocus = false;
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210 controlListener = null;
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211 scrollbarListener = null;
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212 }
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213
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214 /**
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215 * Returns the Control that is displayed above the composite being edited.
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216 *
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217 * @return the Control that is displayed above the composite being edited
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218 */
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219 public Control getEditor () {
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220 return editor;
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221 }
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222
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223 /**
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224 * Lays out the control within the underlying composite. This
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225 * method should be called after changing one or more fields to
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226 * force the Editor to resize.
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227 *
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228 * @since 2.1
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229 */
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230 public void layout () {
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231 if (editor is null || editor.isDisposed())
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232 return;
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233 if (editor.getVisible()) {
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234 hadFocus = editor.isFocusControl();
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235 } // this doesn't work because
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236 // resizing the column takes the focus away
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237 // before we get here
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238 editor.setBounds(computeBounds());
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239 if (hadFocus) {
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240 if (editor is null || editor.isDisposed())
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241 return;
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242 editor.setFocus();
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243 }
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244 }
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245
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246 void scroll (Event e) {
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247 if (editor is null || editor.isDisposed())
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248 return;
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249 layout();
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250 }
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251
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252 /**
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253 * Specify the Control that is to be displayed.
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254 *
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255 * <p>Note: The Control provided as the editor <b>must</b> be created with its parent
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256 * being the Composite specified in the ControlEditor constructor.
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257 *
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258 * @param editor the Control that is displayed above the composite being edited
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259 */
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Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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260 public void setEditor (Control editor) {
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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261
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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262 if (editor is null) {
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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263 // this is the case where the caller is setting the editor to be blank
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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264 // set all the values accordingly
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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265 this.editor = null;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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266 return;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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267 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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268
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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269 this.editor = editor;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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270 layout();
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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271 if (this.editor is null || this.editor.isDisposed())
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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272 return;
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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273 editor.setVisible(true);
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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274 }
380af2bdd8e5 Upload of whole dwt tree
Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
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275 }