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annotate dwtx/jface/viewers/OwnerDrawLabelProvider.d @ 200:eb3414669eb0 default tip

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fix for dmd 1.041 and tango 0.99.8
author Frank Benoit <benoit@tionex.de>
date Sat, 28 Mar 2009 03:09:57 +0100
parents c3583c6ec027
children
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 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
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14 module dwtx.jface.viewers.OwnerDrawLabelProvider;
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15
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16 import dwtx.jface.viewers.CellLabelProvider;
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17 import dwtx.jface.viewers.ColumnViewer;
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18 import dwtx.jface.viewers.ViewerCell;
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19 import dwtx.jface.viewers.ViewerColumn;
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20
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21 import dwt.DWT;
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22 import dwt.graphics.Color;
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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.Event;
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26 import dwt.widgets.Listener;
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27
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28 import dwt.dwthelper.utils;
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29 import dwtx.dwtxhelper.Collection;
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30
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31 /**
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32 * OwnerDrawLabelProvider is an abstract implementation of a label provider that
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33 * handles custom draw.
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34 *
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35 * <p>
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36 * <b>This class is intended to be subclassed by implementors.</b>
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37 * </p>
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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 abstract class OwnerDrawLabelProvider : CellLabelProvider {
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43
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44 alias CellLabelProvider.dispose dispose;
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45
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46 static class OwnerDrawListener : Listener {
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47 Set enabledColumns;
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48 int enabledGlobally = 0;
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49 private ColumnViewer viewer;
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50
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51 this(ColumnViewer viewer) {
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52 enabledColumns = new HashSet();
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53 this.viewer = viewer;
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54 }
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55
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56 public void handleEvent(Event event) {
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57 CellLabelProvider provider = viewer.getViewerColumn(event.index)
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58 .getLabelProvider();
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59 ViewerColumn column = viewer.getViewerColumn(event.index);
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60 if (enabledGlobally > 0 || enabledColumns.contains(column)) {
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61 if (null !is cast(OwnerDrawLabelProvider)provider ) {
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62 Object element = event.item.getData();
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63 OwnerDrawLabelProvider ownerDrawProvider = cast(OwnerDrawLabelProvider) provider;
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64 switch (event.type) {
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65 case DWT.MeasureItem:
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66 ownerDrawProvider.measure(event, element);
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67 break;
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68 case DWT.PaintItem:
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69 ownerDrawProvider.paint(event, element);
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70 break;
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71 case DWT.EraseItem:
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72 ownerDrawProvider.erase(event, element);
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73 break;
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74 default:
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75 }
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76 }
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77 }
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78 }
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79 }
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80
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81 private static const String OWNER_DRAW_LABEL_PROVIDER_LISTENER = "owner_draw_label_provider_listener"; //$NON-NLS-1$
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82
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83 /**
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84 * Set up the owner draw callbacks for the viewer.
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85 *
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86 * @param viewer
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87 * the viewer the owner draw is set up
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88 *
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89 * @deprecated Since 3.4, the default implementation of
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90 * {@link CellLabelProvider#initialize(ColumnViewer, ViewerColumn)}
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91 * in this class will set up the necessary owner draw callbacks
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92 * automatically. Calls to this method can be removed.
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93 */
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94 public static void setUpOwnerDraw(ColumnViewer viewer) {
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95 getOrCreateOwnerDrawListener(viewer).enabledGlobally++;
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96 }
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97
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98 /**
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99 * @param viewer
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100 * @param control
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101 * @return
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102 */
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103 private static OwnerDrawListener getOrCreateOwnerDrawListener(
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104 ColumnViewer viewer) {
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105 Control control = viewer.getControl();
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106 OwnerDrawListener listener = cast(OwnerDrawListener) control
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107 .getData(OWNER_DRAW_LABEL_PROVIDER_LISTENER);
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108 if (listener is null) {
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109 listener = new OwnerDrawListener(viewer);
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110 control.setData(OWNER_DRAW_LABEL_PROVIDER_LISTENER, listener);
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111 control.addListener(DWT.MeasureItem, listener);
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112 control.addListener(DWT.EraseItem, listener);
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113 control.addListener(DWT.PaintItem, listener);
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114 }
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115 return listener;
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116 }
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117
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118 /**
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119 * Create a new instance of the receiver based on a column viewer.
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120 *
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121 */
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122 public this() {
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123
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124 }
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125
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126 public void dispose(ColumnViewer viewer, ViewerColumn column) {
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127 if (!viewer.getControl().isDisposed()) {
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128 setOwnerDrawEnabled(viewer, column, false);
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129 }
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130 super.dispose(viewer, column);
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131 }
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132
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133 /**
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134 * This implementation of
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135 * {@link CellLabelProvider#initialize(ColumnViewer, ViewerColumn)}
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136 * delegates to {@link #initialize(ColumnViewer, ViewerColumn, bool)}
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137 * with a value of <code>true</code> for <code>enableOwnerDraw</code>.
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138 * Subclasses may override this method but should either call the super
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139 * implementation or, alternatively,
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140 * {@link #initialize(ColumnViewer, ViewerColumn, bool)}.
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141 */
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142 protected void initialize(ColumnViewer viewer, ViewerColumn column) {
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143 this.initialize(viewer, column, true);
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144 }
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145
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146 /**
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147 * May be called from subclasses that override
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148 * {@link #initialize(ColumnViewer, ViewerColumn)} but want to customize
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149 * whether owner draw will be enabled. This method calls
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150 * <code>super.initialize(ColumnViewer, ViewerColumn)</code>, and then
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151 * enables or disables owner draw by calling
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152 * {@link #setOwnerDrawEnabled(ColumnViewer, ViewerColumn, bool)}.
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153 *
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154 * @param viewer
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155 * the viewer
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156 * @param column
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157 * the column, or <code>null</code> if a column is not
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158 * available.
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159 * @param enableOwnerDraw
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160 * <code>true</code> if owner draw should be enabled for the
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161 * given viewer and column, <code>false</code> otherwise.
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162 *
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163 * @since 3.4
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164 */
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165 final protected void initialize(ColumnViewer viewer, ViewerColumn column,
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166 bool enableOwnerDraw) {
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167 super.initialize(viewer, column);
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168 setOwnerDrawEnabled(viewer, column, enableOwnerDraw);
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169 }
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170
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171 public void update(ViewerCell cell) {
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172 // Force a redraw
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173 Rectangle cellBounds = cell.getBounds();
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174 cell.getControl().redraw(cellBounds.x, cellBounds.y, cellBounds.width,
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175 cellBounds.height, true);
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176
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177 }
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178
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179 /**
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180 * Handle the erase event. The default implementation colors the background
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181 * of selected areas with {@link DWT#COLOR_LIST_SELECTION} and foregrounds
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182 * with {@link DWT#COLOR_LIST_SELECTION_TEXT}. Note that this
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183 * implementation causes non-native behavior on some platforms. Subclasses
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184 * should override this method and <b>not</b> call the super
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185 * implementation.
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186 *
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187 * @param event
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188 * the erase event
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189 * @param element
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190 * the model object
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191 * @see DWT#EraseItem
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192 * @see DWT#COLOR_LIST_SELECTION
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193 * @see DWT#COLOR_LIST_SELECTION_TEXT
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194 */
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195 protected void erase(Event event, Object element) {
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196
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197 Rectangle bounds = event.getBounds();
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198 if ((event.detail & DWT.SELECTED) !is 0) {
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199
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200 Color oldForeground = event.gc.getForeground();
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201 Color oldBackground = event.gc.getBackground();
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202
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203 event.gc.setBackground(event.item.getDisplay().getSystemColor(
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204 DWT.COLOR_LIST_SELECTION));
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205 event.gc.setForeground(event.item.getDisplay().getSystemColor(
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206 DWT.COLOR_LIST_SELECTION_TEXT));
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207 event.gc.fillRectangle(bounds);
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208 /* restore the old GC colors */
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209 event.gc.setForeground(oldForeground);
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210 event.gc.setBackground(oldBackground);
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211 /* ensure that default selection is not drawn */
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212 event.detail &= ~DWT.SELECTED;
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213
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214 }
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215
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216 }
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217
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218 /**
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219 * Handle the measure event.
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220 *
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221 * @param event
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222 * the measure event
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223 * @param element
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224 * the model element
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225 * @see DWT#MeasureItem
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226 */
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227 protected abstract void measure(Event event, Object element);
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228
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229 /**
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230 * Handle the paint event.
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231 *
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232 * @param event
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233 * the paint event
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234 * @param element
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235 * the model element
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236 * @see DWT#PaintItem
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237 */
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238 protected abstract void paint(Event event, Object element);
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239
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240 /**
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241 * Enables or disables owner draw for the given viewer and column. This
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242 * method will attach or remove a listener to the underlying control as
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243 * necessary. This method is called from
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244 * {@link #initialize(ColumnViewer, ViewerColumn)} and
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245 * {@link #dispose(ColumnViewer, ViewerColumn)} but may be called from
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246 * subclasses to enable or disable owner draw dynamically.
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247 *
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248 * @param viewer
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249 * the viewer
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250 * @param column
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251 * the column, or <code>null</code> if a column is not
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252 * available
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253 * @param enabled
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254 * <code>true</code> if owner draw should be enabled,
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255 * <code>false</code> otherwise
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256 *
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257 * @since 3.4
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258 */
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259 protected void setOwnerDrawEnabled(ColumnViewer viewer,
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260 ViewerColumn column, bool enabled) {
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261 if (enabled) {
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262 OwnerDrawListener listener = getOrCreateOwnerDrawListener(viewer);
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263 if (column is null) {
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264 listener.enabledGlobally++;
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265 } else {
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266 listener.enabledColumns.add(column);
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267 }
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268 } else {
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269 OwnerDrawListener listener = cast(OwnerDrawListener) viewer
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270 .getControl().getData(OWNER_DRAW_LABEL_PROVIDER_LISTENER);
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271 if (listener !is null) {
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272 if (column is null) {
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273 listener.enabledGlobally--;
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274 } else {
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275 listener.enabledColumns.remove(column);
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276 }
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277 if (listener.enabledColumns.isEmpty()
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278 && listener.enabledGlobally <= 0) {
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279 viewer.getControl().removeListener(DWT.MeasureItem,
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280 listener);
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281 viewer.getControl().removeListener(DWT.EraseItem, listener);
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282 viewer.getControl().removeListener(DWT.PaintItem, listener);
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283 viewer.getControl().setData(
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284 OWNER_DRAW_LABEL_PROVIDER_LISTENER, null);
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285 }
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286 }
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287 }
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288 }
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289
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290 }