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1 /*******************************************************************************
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2 * Copyright (c) 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 * Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
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11 * - bug fix for bug 187189
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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 dwtx.jface.viewers.SWTFocusCellManager;
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17
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18 import dwtx.jface.viewers.CellNavigationStrategy;
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19 import dwtx.jface.viewers.ColumnViewer;
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20 import dwtx.jface.viewers.ViewerCell;
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21 import dwtx.jface.viewers.ViewerRow;
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22 import dwtx.jface.viewers.FocusCellHighlighter;
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23 import dwtx.jface.viewers.Viewer;
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24 import dwtx.jface.viewers.ISelectionChangedListener;
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25 import dwtx.jface.viewers.SelectionChangedEvent;
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26
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27 import dwt.DWT;
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28 import dwt.events.DisposeEvent;
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29 import dwt.events.DisposeListener;
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30 import dwt.graphics.Point;
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31 import dwt.widgets.Event;
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32 import dwt.widgets.Listener;
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33 import dwtx.core.runtime.Assert;
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34
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35 /**
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36 * This class is responsible to provide cell management base features for the
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37 * DWT-Controls {@link dwt.widgets.Table} and
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38 * {@link dwt.widgets.Tree}.
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39 *
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40 * @since 3.3
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41 *
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42 */
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43 abstract class SWTFocusCellManager {
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44
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45 private CellNavigationStrategy navigationStrategy;
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46
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47 private ColumnViewer viewer;
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48
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49 private ViewerCell focusCell;
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50
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51 private FocusCellHighlighter cellHighlighter;
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52
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53 private DisposeListener itemDeletionListener;
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54
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55 /**
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56 * @param viewer
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57 * @param focusDrawingDelegate
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58 * @param navigationDelegate
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59 */
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60 public this(ColumnViewer viewer,
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61 FocusCellHighlighter focusDrawingDelegate,
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62 CellNavigationStrategy navigationDelegate) {
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63
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64 itemDeletionListener = new class DisposeListener {
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65 public void widgetDisposed(DisposeEvent e) {
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66 setFocusCell(null);
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67 }
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68 };
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69
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70 this.viewer = viewer;
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71 this.cellHighlighter = focusDrawingDelegate;
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72 this.navigationStrategy = navigationDelegate;
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73 hookListener(viewer);
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74 }
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75
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76 /**
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77 * This method is called by the framework to initialize this cell manager.
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78 */
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79 void init() {
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80 this.cellHighlighter.init_package();
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81 this.navigationStrategy.init_package();
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82 }
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83
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84 private void handleMouseDown(Event event) {
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85 ViewerCell cell = viewer.getCell(new Point(event.x, event.y));
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86 if (cell !is null) {
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87
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88 if (!cell.opEquals(focusCell)) {
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89 setFocusCell(cell);
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90 }
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91 }
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92 }
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93
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94 private void handleKeyDown(Event event) {
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95 ViewerCell tmp = null;
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96
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97 if (navigationStrategy.isCollapseEvent(viewer, focusCell, event)) {
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98 navigationStrategy.collapse(viewer, focusCell, event);
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99 } else if (navigationStrategy.isExpandEvent(viewer, focusCell, event)) {
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100 navigationStrategy.expand(viewer, focusCell, event);
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101 } else if (navigationStrategy.isNavigationEvent(viewer, event)) {
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102 tmp = navigationStrategy.findSelectedCell(viewer, focusCell, event);
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103
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104 if (tmp !is null) {
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105 if (!tmp.opEquals(focusCell)) {
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106 setFocusCell(tmp);
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107 }
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108 }
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109 }
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110
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111 if (navigationStrategy.shouldCancelEvent(viewer, event)) {
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112 event.doit = false;
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113 }
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114 }
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115
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116 private void handleSelection(Event event) {
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117 if (focusCell !is null && focusCell.getItem() !is event.item
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118 && event.item !is null) {
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119 ViewerRow row = viewer.getViewerRowFromItem_package(event.item);
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120 Assert
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121 .isNotNull(row,
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122 "Internal Structure invalid. Row item has no row ViewerRow assigned"); //$NON-NLS-1$
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123 ViewerCell tmp = row.getCell(focusCell.getColumnIndex());
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124 if (!focusCell.opEquals(tmp)) {
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125 setFocusCell(tmp);
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126 }
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127 }
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128 }
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129
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130 private void handleFocusIn(Event event) {
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131 if (focusCell is null) {
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132 setFocusCell(getInitialFocusCell());
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133 }
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134 }
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135
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136 abstract ViewerCell getInitialFocusCell();
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137
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138 private void hookListener(ColumnViewer viewer) {
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139 Listener listener = new class Listener {
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140
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141 public void handleEvent(Event event) {
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142 switch (event.type) {
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143 case DWT.MouseDown:
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144 handleMouseDown(event);
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145 break;
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146 case DWT.KeyDown:
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147 handleKeyDown(event);
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148 break;
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149 case DWT.Selection:
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150 handleSelection(event);
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151 break;
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152 case DWT.FocusIn:
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153 handleFocusIn(event);
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154 break;
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155 }
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156 }
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157 };
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158
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159 viewer.getControl().addListener(DWT.MouseDown, listener);
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160 viewer.getControl().addListener(DWT.KeyDown, listener);
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161 viewer.getControl().addListener(DWT.Selection, listener);
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162 viewer.addSelectionChangedListener(new class ISelectionChangedListener {
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163
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164 public void selectionChanged(SelectionChangedEvent event) {
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165 if( event.getSelection_package.isEmpty() ) {
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166 setFocusCell(null);
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167 }
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168 }
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169
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170 });
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171 viewer.getControl().addListener(DWT.FocusIn, listener);
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172 }
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173
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174 /**
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175 * @return the cell with the focus
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176 *
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177 */
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178 public ViewerCell getFocusCell() {
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179 return focusCell;
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180 }
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181
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182 void setFocusCell(ViewerCell focusCell) {
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183 if( this.focusCell !is null && ! this.focusCell.getItem().isDisposed() ) {
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184 this.focusCell.getItem().removeDisposeListener(itemDeletionListener);
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185 }
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186
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187 this.focusCell = focusCell;
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188
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189 if( this.focusCell !is null && ! this.focusCell.getItem().isDisposed() ) {
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190 this.focusCell.getItem().addDisposeListener(itemDeletionListener);
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191 }
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192
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193 this.cellHighlighter.focusCellChanged_package(focusCell);
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194 }
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195
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196 ColumnViewer getViewer() {
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197 return viewer;
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198 }
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199 }
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