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annotate dwt/custom/TreeEditor.d @ 5:1a8b3cb347e0

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Fix Ctors to 'this'
author Frank Benoit <benoit@tionex.de>
date Wed, 27 Aug 2008 14:02:31 +0200
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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.custom;
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12
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13
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14 import dwt.*;
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15 import dwt.events.*;
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16 import dwt.graphics.*;
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17 import dwt.widgets.*;
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18
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19 /**
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20 *
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21 * A TreeEditor is a manager for a Control that appears above a cell in a Tree and tracks with the
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22 * moving and resizing of that cell. It can be used to display a text widget above a cell
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23 * 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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24 * a button that can launch a dialog for modifying the contents of the associated cell.
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25 *
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26 * <p> Here is an example of using a TreeEditor:
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27 * <code><pre>
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28 * final Tree tree = new Tree(shell, DWT.BORDER);
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29 * for (int i = 0; i &lt; 3; i++) {
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30 * TreeItem item = new TreeItem(tree, DWT.NONE);
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31 * item.setText("item " + i);
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32 * for (int j = 0; j &lt; 3; j++) {
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33 * TreeItem subItem = new TreeItem(item, DWT.NONE);
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34 * subItem.setText("item " + i + " " + j);
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35 * }
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36 * }
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37 *
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38 * final TreeEditor editor = new TreeEditor(tree);
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39 * //The editor must have the same size as the cell and must
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40 * //not be any smaller than 50 pixels.
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41 * editor.horizontalAlignment = DWT.LEFT;
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42 * editor.grabHorizontal = true;
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43 * editor.minimumWidth = 50;
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44 *
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45 * tree.addSelectionListener(new SelectionAdapter() {
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46 * public void widgetSelected(SelectionEvent e) {
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47 * // Clean up any previous editor control
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48 * Control oldEditor = editor.getEditor();
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49 * if (oldEditor !is null) oldEditor.dispose();
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50 *
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51 * // Identify the selected row
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52 * TreeItem item = (TreeItem)e.item;
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53 * if (item is null) return;
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54 *
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55 * // The control that will be the editor must be a child of the Tree
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56 * Text newEditor = new Text(tree, DWT.NONE);
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57 * newEditor.setText(item.getText());
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58 * newEditor.addModifyListener(new ModifyListener() {
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59 * public void modifyText(ModifyEvent e) {
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60 * Text text = (Text)editor.getEditor();
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61 * editor.getItem().setText(text.getText());
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62 * }
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63 * });
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64 * newEditor.selectAll();
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65 * newEditor.setFocus();
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66 * editor.setEditor(newEditor, item);
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67 * }
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68 * });
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69 * </pre></code>
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70 */
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71 public class TreeEditor : ControlEditor {
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72 Tree tree;
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73 TreeItem item;
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74 int column = 0;
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75 ControlListener columnListener;
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76 TreeListener treeListener;
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77 Runnable timer;
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78 static final int TIMEOUT = 1500;
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79
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80 /**
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81 * Creates a TreeEditor for the specified Tree.
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82 *
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83 * @param tree the Tree Control above which this editor will be displayed
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84 *
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85 */
5
1a8b3cb347e0 Fix Ctors to 'this'
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86 public this (Tree tree) {
0
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87 super(tree);
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88 this.tree = tree;
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89
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90 columnListener = new ControlListener() {
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91 public void controlMoved(ControlEvent e){
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92 layout();
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93 }
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94 public void controlResized(ControlEvent e){
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95 layout();
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96 }
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97 };
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98 timer = new Runnable () {
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99 public void run() {
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100 layout ();
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101 }
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102 };
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103 treeListener = new TreeListener () {
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104 final Runnable runnable = new Runnable() {
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105 public void run() {
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106 if (editor is null || editor.isDisposed()) return;
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107 if (TreeEditor.this.tree.isDisposed()) return;
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108 layout();
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109 editor.setVisible(true);
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110 }
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111 };
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112 public void treeCollapsed(TreeEvent e) {
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113 if (editor is null || editor.isDisposed ()) return;
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114 editor.setVisible(false);
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115 e.display.asyncExec(runnable);
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116 }
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117 public void treeExpanded(TreeEvent e) {
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118 if (editor is null || editor.isDisposed ()) return;
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119 editor.setVisible(false);
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120 e.display.asyncExec(runnable);
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121 }
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122 };
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123 tree.addTreeListener(treeListener);
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124
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125 // To be consistent with older versions of DWT, grabVertical defaults to true
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126 grabVertical = true;
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127 }
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128
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129 Rectangle computeBounds () {
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130 if (item is null || column is -1 || item.isDisposed()) return new Rectangle(0, 0, 0, 0);
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131 Rectangle cell = item.getBounds(column);
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132 Rectangle rect = item.getImageBounds(column);
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133 cell.x = rect.x + rect.width;
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134 cell.width -= rect.width;
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135 Rectangle area = tree.getClientArea();
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136 if (cell.x < area.x + area.width) {
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137 if (cell.x + cell.width > area.x + area.width) {
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138 cell.width = area.x + area.width - cell.x;
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139 }
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140 }
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141 Rectangle editorRect = new Rectangle(cell.x, cell.y, minimumWidth, minimumHeight);
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142
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143 if (grabHorizontal) {
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144 if (tree.getColumnCount() is 0) {
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145 // Bounds of tree item only include the text area - stretch out to include
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146 // entire client area
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147 cell.width = area.x + area.width - cell.x;
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148 }
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149 editorRect.width = Math.max(cell.width, minimumWidth);
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150 }
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151
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152 if (grabVertical) {
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153 editorRect.height = Math.max(cell.height, minimumHeight);
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154 }
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155
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156 if (horizontalAlignment is DWT.RIGHT) {
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157 editorRect.x += cell.width - editorRect.width;
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158 } else if (horizontalAlignment is DWT.LEFT) {
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159 // do nothing - cell.x is the right answer
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160 } else { // default is CENTER
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161 editorRect.x += (cell.width - editorRect.width)/2;
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162 }
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163 // don't let the editor overlap with the +/- of the tree
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164 editorRect.x = Math.max(cell.x, editorRect.x);
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165
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166 if (verticalAlignment is DWT.BOTTOM) {
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167 editorRect.y += cell.height - editorRect.height;
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168 } else if (verticalAlignment is DWT.TOP) {
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169 // do nothing - cell.y is the right answer
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170 } else { // default is CENTER
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171 editorRect.y += (cell.height - editorRect.height)/2;
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172 }
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173 return editorRect;
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174 }
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175
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176 /**
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177 * Removes all associations between the TreeEditor and the row in the tree. The
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178 * tree and the editor Control are <b>not</b> disposed.
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179 */
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180 public void dispose () {
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181 if (tree !is null && !tree.isDisposed()) {
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182 if (this.column > -1 && this.column < tree.getColumnCount()){
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183 TreeColumn treeColumn = tree.getColumn(this.column);
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184 treeColumn.removeControlListener(columnListener);
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185 }
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186 if (treeListener !is null) tree.removeTreeListener(treeListener);
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187 }
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188 columnListener = null;
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189 treeListener = null;
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190 tree = null;
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191 item = null;
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192 column = 0;
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193 timer = null;
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194 super.dispose();
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195 }
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196
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197 /**
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198 * Returns the zero based index of the column of the cell being tracked by this editor.
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199 *
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200 * @return the zero based index of the column of the cell being tracked by this editor
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201 *
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202 * @since 3.1
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203 */
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204 public int getColumn () {
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205 return column;
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206 }
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207
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208 /**
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209 * Returns the TreeItem for the row of the cell being tracked by this editor.
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210 *
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211 * @return the TreeItem for the row of the cell being tracked by this editor
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212 */
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213 public TreeItem getItem () {
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214 return item;
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215 }
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216
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217 void resize () {
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218 layout();
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219 /*
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220 * On some platforms, the table scrolls when an item that
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221 * is partially visible at the bottom of the table is
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222 * selected. Ensure that the correct row is edited by
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223 * laying out one more time in a timerExec().
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224 */
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225 if (tree !is null) {
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226 Display display = tree.getDisplay();
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227 display.timerExec(-1, timer);
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228 display.timerExec(TIMEOUT, timer);
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229 }
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230 }
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231
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232 /**
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233 * Sets the zero based index of the column of the cell being tracked by this editor.
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234 *
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235 * @param column the zero based index of the column of the cell being tracked by this editor
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236 *
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237 * @since 3.1
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238 */
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239 public void setColumn(int column) {
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240 int columnCount = tree.getColumnCount();
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241 // Separately handle the case where the tree has no TreeColumns.
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242 // In this situation, there is a single default column.
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243 if (columnCount is 0) {
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244 this.column = (column is 0) ? 0 : -1;
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245 resize();
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246 return;
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247 }
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248 if (this.column > -1 && this.column < columnCount){
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249 TreeColumn treeColumn = tree.getColumn(this.column);
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250 treeColumn.removeControlListener(columnListener);
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251 this.column = -1;
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252 }
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253
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254 if (column < 0 || column >= tree.getColumnCount()) return;
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255
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256 this.column = column;
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257 TreeColumn treeColumn = tree.getColumn(this.column);
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258 treeColumn.addControlListener(columnListener);
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259 resize();
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260 }
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261
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262 public void setItem (TreeItem item) {
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263 this.item = item;
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264 resize();
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265 }
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266
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267 /**
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268 * 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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269 *
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270 * <p>Note: The Control provided as the editor <b>must</b> be created with its parent being the Tree control
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271 * specified in the TreeEditor constructor.
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272 *
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273 * @param editor the Control that is displayed above the cell being edited
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274 * @param item the TreeItem for the row of the cell being tracked by this editor
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275 * @param column the zero based index of the column of the cell being tracked by this editor
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276 *
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277 * @since 3.1
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278 */
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279 public void setEditor (Control editor, TreeItem item, int column) {
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280 setItem(item);
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281 setColumn(column);
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282 setEditor(editor);
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283 }
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284 public void setEditor (Control editor) {
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285 super.setEditor(editor);
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286 resize();
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287 }
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288
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289 /**
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290 * 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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291 *
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292 * <p>Note: The Control provided as the editor <b>must</b> be created with its parent being the Tree control
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293 * specified in the TreeEditor constructor.
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294 *
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295 * @param editor the Control that is displayed above the cell being edited
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296 * @param item the TreeItem for the row of the cell being tracked by this editor
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297 */
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298 public void setEditor (Control editor, TreeItem item) {
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299 setItem(item);
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300 setEditor(editor);
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301 }
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302
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303 public void layout () {
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304 if (tree is null || tree.isDisposed()) return;
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305 if (item is null || item.isDisposed()) return;
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306 int columnCount = tree.getColumnCount();
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307 if (columnCount is 0 && column !is 0) return;
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308 if (columnCount > 0 && (column < 0 || column >= columnCount)) return;
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309 super.layout();
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310 }
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311 }