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annotate dwt/custom/TreeEditor.d @ 150:1ec7c20355bd

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Fixes #38
author Jacob Carlborg <doob@me.com>
date Wed, 10 Jun 2009 20:51:17 +0200
parents 07399639c0c8
children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module dwt.custom.TreeEditor;
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15 import dwt.dwthelper.utils;
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17
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18 import dwt.DWT;
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19 import dwt.events.ControlEvent;
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20 import dwt.events.ControlListener;
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21 import dwt.events.TreeEvent;
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22 import dwt.events.TreeListener;
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23 import dwt.graphics.Rectangle;
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24 import dwt.widgets.Control;
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25 import dwt.widgets.Display;
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26 import dwt.widgets.Tree;
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27 import dwt.widgets.TreeColumn;
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28 import dwt.widgets.TreeItem;
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29 import dwt.custom.ControlEditor;
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31 /**
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32 *
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33 * A TreeEditor is a manager for a Control that appears above a cell in a Tree and tracks with the
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34 * moving and resizing of that cell. It can be used to display a text widget above a cell
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35 * in a Tree so that the user can edit the contents of that cell. It can also be used to display
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36 * a button that can launch a dialog for modifying the contents of the associated cell.
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37 *
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38 * <p> Here is an example of using a TreeEditor:
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39 * <code><pre>
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40 * final Tree tree = new Tree(shell, DWT.BORDER);
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41 * for (int i = 0; i &lt; 3; i++) {
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42 * TreeItem item = new TreeItem(tree, DWT.NONE);
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43 * item.setText("item " + i);
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44 * for (int j = 0; j &lt; 3; j++) {
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45 * TreeItem subItem = new TreeItem(item, DWT.NONE);
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46 * subItem.setText("item " + i + " " + j);
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47 * }
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48 * }
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49 *
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50 * final TreeEditor editor = new TreeEditor(tree);
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51 * //The editor must have the same size as the cell and must
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52 * //not be any smaller than 50 pixels.
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53 * editor.horizontalAlignment = DWT.LEFT;
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54 * editor.grabHorizontal = true;
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55 * editor.minimumWidth = 50;
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56 *
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57 * tree.addSelectionListener(new SelectionAdapter() {
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58 * public void widgetSelected(SelectionEvent e) {
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59 * // Clean up any previous editor control
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60 * Control oldEditor = editor.getEditor();
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61 * if (oldEditor !is null) oldEditor.dispose();
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62 *
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63 * // Identify the selected row
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64 * TreeItem item = (TreeItem)e.item;
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65 * if (item is null) return;
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66 *
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67 * // The control that will be the editor must be a child of the Tree
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68 * Text newEditor = new Text(tree, DWT.NONE);
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69 * newEditor.setText(item.getText());
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70 * newEditor.addModifyListener(new ModifyListener() {
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71 * public void modifyText(ModifyEvent e) {
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72 * Text text = (Text)editor.getEditor();
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73 * editor.getItem().setText(text.getText());
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74 * }
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75 * });
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76 * newEditor.selectAll();
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77 * newEditor.setFocus();
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78 * editor.setEditor(newEditor, item);
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79 * }
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80 * });
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81 * </pre></code>
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82 *
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83 * @see <a href="http://www.eclipse.org/swt/snippets/#treeeditor">TreeEditor snippets</a>
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84 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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85 */
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86
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87 public class TreeEditor : ControlEditor {
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88 Tree tree;
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89 TreeItem item;
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90 int column = 0;
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91 ControlListener columnListener;
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92 TreeListener treeListener;
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93 Runnable timer;
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94 static const int TIMEOUT = 1500;
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95
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96 /**
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97 * Creates a TreeEditor for the specified Tree.
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98 *
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99 * @param tree the Tree Control above which this editor will be displayed
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100 *
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101 */
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102 public this (Tree tree) {
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103 super(tree);
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104 this.tree = tree;
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105
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106 columnListener = new class() ControlListener {
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107 public void controlMoved(ControlEvent e){
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108 layout();
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109 }
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110 public void controlResized(ControlEvent e){
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111 layout();
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112 }
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113 };
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114 timer = new class() Runnable {
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115 public void run() {
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116 layout ();
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117 }
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118 };
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119 treeListener = new class(this) TreeListener {
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120 TreeEditor td;
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121 Runnable runnable;
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122
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123 this (TreeEditor td) {
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124 this.td = td;
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125
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126 runnable = new class() Runnable {
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127 public void run() {
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128 if (td.editor is null || td.editor.isDisposed()) return;
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129 if (td.tree.isDisposed()) return;
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130 td.layout();
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131 td.editor.setVisible(true);
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132 }
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133 };
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134 }
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135 public void treeCollapsed(TreeEvent e) {
150
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136 if (td.editor is null || td.editor.isDisposed ()) return;
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137 td.editor.setVisible(false);
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138 e.display.asyncExec(runnable);
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139 }
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140 public void treeExpanded(TreeEvent e) {
150
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141 if (td.editor is null || td.editor.isDisposed ()) return;
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142 td.editor.setVisible(false);
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143 e.display.asyncExec(runnable);
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144 }
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145 };
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146 tree.addTreeListener(treeListener);
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147
0
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148 // To be consistent with older versions of DWT, grabVertical defaults to true
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149 grabVertical = true;
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150 }
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151
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152 override Rectangle computeBounds () {
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153 if (item is null || column is -1 || item.isDisposed()) return new Rectangle(0, 0, 0, 0);
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154 Rectangle cell = item.getBounds(column);
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155 Rectangle rect = item.getImageBounds(column);
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156 cell.x = rect.x + rect.width;
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157 cell.width -= rect.width;
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158 Rectangle area = tree.getClientArea();
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159 if (cell.x < area.x + area.width) {
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160 if (cell.x + cell.width > area.x + area.width) {
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161 cell.width = area.x + area.width - cell.x;
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162 }
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163 }
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164 Rectangle editorRect = new Rectangle(cell.x, cell.y, minimumWidth, minimumHeight);
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165
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166 if (grabHorizontal) {
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167 if (tree.getColumnCount() is 0) {
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168 // Bounds of tree item only include the text area - stretch out to include
0
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169 // entire client area
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170 cell.width = area.x + area.width - cell.x;
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171 }
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172 editorRect.width = Math.max(cell.width, minimumWidth);
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173 }
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174
0
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175 if (grabVertical) {
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176 editorRect.height = Math.max(cell.height, minimumHeight);
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177 }
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178
0
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179 if (horizontalAlignment is DWT.RIGHT) {
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180 editorRect.x += cell.width - editorRect.width;
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181 } else if (horizontalAlignment is DWT.LEFT) {
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182 // do nothing - cell.x is the right answer
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183 } else { // default is CENTER
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184 editorRect.x += (cell.width - editorRect.width)/2;
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185 }
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186 // don't let the editor overlap with the + / - of the tree
0
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187 editorRect.x = Math.max(cell.x, editorRect.x);
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188
0
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189 if (verticalAlignment is DWT.BOTTOM) {
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190 editorRect.y += cell.height - editorRect.height;
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191 } else if (verticalAlignment is DWT.TOP) {
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192 // do nothing - cell.y is the right answer
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193 } else { // default is CENTER
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194 editorRect.y += (cell.height - editorRect.height)/2;
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195 }
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196 return editorRect;
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197 }
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198
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199 /**
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200 * Removes all associations between the TreeEditor and the row in the tree. The
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201 * tree and the editor Control are <b>not</b> disposed.
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202 */
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203 public override void dispose () {
0
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204 if (tree !is null && !tree.isDisposed()) {
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205 if (this.column > -1 && this.column < tree.getColumnCount()){
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206 TreeColumn treeColumn = tree.getColumn(this.column);
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207 treeColumn.removeControlListener(columnListener);
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208 }
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209 if (treeListener !is null) tree.removeTreeListener(treeListener);
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210 }
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211 columnListener = null;
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212 treeListener = null;
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213 tree = null;
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214 item = null;
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215 column = 0;
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216 timer = null;
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217 super.dispose();
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218 }
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219
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220 /**
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221 * Returns the zero based index of the column of the cell being tracked by this editor.
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222 *
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223 * @return the zero based index of the column of the cell being tracked by this editor
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224 *
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225 * @since 3.1
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226 */
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227 public int getColumn () {
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228 return column;
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229 }
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230
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231 /**
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232 * Returns the TreeItem for the row of the cell being tracked by this editor.
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233 *
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234 * @return the TreeItem for the row of the cell being tracked by this editor
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235 */
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236 public TreeItem getItem () {
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237 return item;
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238 }
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239
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240 void resize () {
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241 layout();
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242 /*
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243 * On some platforms, the table scrolls when an item that
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244 * is partially visible at the bottom of the table is
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245 * selected. Ensure that the correct row is edited by
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246 * laying out one more time in a timerExec().
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247 */
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248 if (tree !is null) {
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249 Display display = tree.getDisplay();
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250 display.timerExec(-1, timer);
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251 display.timerExec(TIMEOUT, timer);
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252 }
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253 }
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254
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255 /**
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256 * Sets the zero based index of the column of the cell being tracked by this editor.
41
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257 *
0
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258 * @param column the zero based index of the column of the cell being tracked by this editor
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259 *
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260 * @since 3.1
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261 */
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262 public void setColumn(int column) {
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263 int columnCount = tree.getColumnCount();
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264 // Separately handle the case where the tree has no TreeColumns.
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265 // In this situation, there is a single default column.
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266 if (columnCount is 0) {
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267 this.column = (column is 0) ? 0 : -1;
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268 resize();
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269 return;
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270 }
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271 if (this.column > -1 && this.column < columnCount){
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272 TreeColumn treeColumn = tree.getColumn(this.column);
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273 treeColumn.removeControlListener(columnListener);
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274 this.column = -1;
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275 }
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276
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277 if (column < 0 || column >= tree.getColumnCount()) return;
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278
0
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279 this.column = column;
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280 TreeColumn treeColumn = tree.getColumn(this.column);
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281 treeColumn.addControlListener(columnListener);
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282 resize();
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283 }
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284
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285 /**
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286 * Specifies the <code>TreeItem</code> that is to be edited.
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287 *
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288 * @param item the item to be edited
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289 */
0
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290 public void setItem (TreeItem item) {
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291 this.item = item;
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292 resize();
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293 }
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294
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295 /**
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296 * Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.
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297 *
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298 * <p>Note: The Control provided as the editor <b>must</b> be created with its parent being the Tree control
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299 * specified in the TreeEditor constructor.
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300 *
0
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301 * @param editor the Control that is displayed above the cell being edited
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302 * @param item the TreeItem for the row of the cell being tracked by this editor
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303 * @param column the zero based index of the column of the cell being tracked by this editor
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304 *
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305 * @since 3.1
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306 */
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307 public void setEditor (Control editor, TreeItem item, int column) {
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308 setItem(item);
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309 setColumn(column);
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310 setEditor(editor);
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311 }
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312 public override void setEditor (Control editor) {
0
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313 super.setEditor(editor);
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314 resize();
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315 }
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316
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317 /**
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318 * Specify the Control that is to be displayed and the cell in the tree that it is to be positioned above.
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319 *
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320 * <p>Note: The Control provided as the editor <b>must</b> be created with its parent being the Tree control
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321 * specified in the TreeEditor constructor.
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322 *
0
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323 * @param editor the Control that is displayed above the cell being edited
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324 * @param item the TreeItem for the row of the cell being tracked by this editor
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325 */
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326 public void setEditor (Control editor, TreeItem item) {
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327 setItem(item);
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328 setEditor(editor);
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329 }
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330
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331 public override void layout () {
0
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332 if (tree is null || tree.isDisposed()) return;
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333 if (item is null || item.isDisposed()) return;
0
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334 int columnCount = tree.getColumnCount();
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335 if (columnCount is 0 && column !is 0) return;
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336 if (columnCount > 0 && (column < 0 || column >= columnCount)) return;
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337 super.layout();
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338 }
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339
123
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340 }