annotate org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewerFocusCellManager.d @ 12:bc29606a740c

Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2007, 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 * Tom Schindl<tom.schindl@bestsolution.at> - initial API and implementation
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11 * - fix in bug: 195908, 210752
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12 * Port to the D programming language:
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13 * Frank Benoit <benoit@tionex.de>
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14 *******************************************************************************/
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15
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16 module org.eclipse.jface.viewers.TreeViewerFocusCellManager;
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17
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18 import org.eclipse.jface.viewers.SWTFocusCellManager;
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19 import org.eclipse.jface.viewers.CellNavigationStrategy;
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20 import org.eclipse.jface.viewers.TreeViewer;
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21 import org.eclipse.jface.viewers.FocusCellHighlighter;
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22 import org.eclipse.jface.viewers.ViewerCell;
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23 import org.eclipse.jface.viewers.ColumnViewer;
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24
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25 import org.eclipse.swt.SWT;
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26 import org.eclipse.swt.widgets.Event;
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27 import org.eclipse.swt.widgets.Item;
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28 import org.eclipse.swt.widgets.Tree;
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29 import org.eclipse.swt.widgets.TreeItem;
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30
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31 import java.lang.all;
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32 import java.util.Set;
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33
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34 /**
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35 * This class is responsible to provide the concept of cells for {@link Tree}.
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36 * This concept is needed to provide features like editor activation with the
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37 * keyboard
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38 *
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39 * @since 3.3
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40 *
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41 */
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42 public class TreeViewerFocusCellManager : SWTFocusCellManager {
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43 private static /+final+/ CellNavigationStrategy TREE_NAVIGATE;
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44 static this(){
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45 TREE_NAVIGATE = new class CellNavigationStrategy {
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46 public void collapse(ColumnViewer viewer, ViewerCell cellToCollapse,
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47 Event event) {
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48 if (cellToCollapse !is null) {
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49 (cast(TreeItem) cellToCollapse.getItem()).setExpanded(false);
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50 }
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51 }
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52
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53 public void expand(ColumnViewer viewer, ViewerCell cellToExpand,
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54 Event event) {
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55 if (cellToExpand !is null) {
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56 TreeViewer v = cast(TreeViewer) viewer;
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57 v.setExpandedState(v.getTreePathFromItem_package(cast(Item)cellToExpand
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58 .getItem()), true);
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59 }
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60 }
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61
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62 public bool isCollapseEvent(ColumnViewer viewer,
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63 ViewerCell cellToCollapse, Event event) {
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64
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65 if (cellToCollapse is null) {
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66 return false;
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67 }
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68
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69 return cellToCollapse !is null
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70 && (cast(TreeItem) cellToCollapse.getItem()).getExpanded()
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71 && event.keyCode is SWT.ARROW_LEFT
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72 && isFirstColumnCell(cellToCollapse);
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73 }
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74
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75 public bool isExpandEvent(ColumnViewer viewer,
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76 ViewerCell cellToExpand, Event event) {
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77
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78 if (cellToExpand is null) {
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79 return false;
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80 }
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81
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82 return cellToExpand !is null
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83 && (cast(TreeItem) cellToExpand.getItem()).getItemCount() > 0
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84 && !(cast(TreeItem) cellToExpand.getItem()).getExpanded()
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85 && event.keyCode is SWT.ARROW_RIGHT
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86 && isFirstColumnCell(cellToExpand);
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87 }
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88
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89 private bool isFirstColumnCell(ViewerCell cell) {
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90 return cell.getViewerRow().getVisualIndex_package(cell.getColumnIndex()) is 0;
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91 }
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92 };
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93 }
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94
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95 /**
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96 * Create a new manager using a default navigation strategy:
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97 * <ul>
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98 * <li><code>SWT.ARROW_UP</code>: navigate to cell above</li>
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99 * <li><code>SWT.ARROW_DOWN</code>: navigate to cell below</li>
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100 * <li><code>SWT.ARROW_RIGHT</code>: on first column (collapses if item
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101 * is expanded) else navigate to next visible cell on the right</li>
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102 * <li><code>SWT.ARROW_LEFT</code>: on first column (expands if item is
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103 * collapsed) else navigate to next visible cell on the left</li>
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104 * </ul>
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105 *
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106 * @param viewer
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107 * the viewer the manager is bound to
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108 * @param focusDrawingDelegate
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109 * the delegate responsible to highlight selected cell
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110 */
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111 public this(TreeViewer viewer,
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112 FocusCellHighlighter focusDrawingDelegate) {
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113 this(viewer, focusDrawingDelegate, TREE_NAVIGATE);
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114 }
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115
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116 /**
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117 * Create a new manager with a custom navigation strategy
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118 *
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119 * @param viewer
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120 * the viewer the manager is bound to
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121 * @param focusDrawingDelegate
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122 * the delegate responsible to highlight selected cell
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123 * @param navigationStrategy
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124 * the strategy used to navigate the cells
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125 * @since 3.4
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126 */
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127 public this(TreeViewer viewer,
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128 FocusCellHighlighter focusDrawingDelegate,
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129 CellNavigationStrategy navigationStrategy) {
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130 super(viewer, focusDrawingDelegate, navigationStrategy);
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131 }
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132
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133 override ViewerCell getInitialFocusCell() {
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134 Tree tree = cast(Tree) getViewer().getControl();
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135
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136 if (! tree.isDisposed() && tree.getItemCount() > 0 && ! tree.getItem(0).isDisposed()) {
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137 return getViewer().getViewerRowFromItem_package(tree.getItem(0)).getCell(0);
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138 }
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139
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140 return null;
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141 }
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142
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143 public ViewerCell getFocusCell() {
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144 ViewerCell cell = super.getFocusCell();
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145 Tree t = cast(Tree) getViewer().getControl();
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146
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147 // It is possible that the selection has changed under the hood
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148 if (cell !is null) {
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149 if (t.getSelection().length is 1
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150 && t.getSelection()[0] !is cell.getItem()) {
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151 setFocusCell(getViewer().getViewerRowFromItem_package(
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152 t.getSelection()[0]).getCell(cell.getColumnIndex()));
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153 }
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154 }
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155
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156 return super.getFocusCell();
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157 }
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158 }