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1 /*******************************************************************************
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2 * Copyright (c) 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 dwtx.jface.internal.text.TableOwnerDrawSupport;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwt.DWT;
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18 import dwt.custom.StyleRange;
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19 import dwt.graphics.Color;
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20 import dwt.graphics.GC;
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21 import dwt.graphics.Image;
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22 import dwt.graphics.Rectangle;
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23 import dwt.graphics.TextLayout;
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24 import dwt.widgets.Event;
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25 import dwt.widgets.Listener;
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26 import dwt.widgets.Table;
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27 import dwt.widgets.TableItem;
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28
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29
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30 /**
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31 * Adds owner draw support for tables.
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32 *
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33 * @since 3.4
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34 */
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35 public class TableOwnerDrawSupport : Listener {
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36
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37 private static final String STYLED_RANGES_KEY= "styled_ranges"; //$NON-NLS-1$
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38
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39 private TextLayout fLayout;
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40
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41 public static void install(Table table) {
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42 TableOwnerDrawSupport listener= new TableOwnerDrawSupport(table);
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43 table.addListener(DWT.Dispose, listener);
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44 table.addListener(DWT.MeasureItem, listener);
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45 table.addListener(DWT.EraseItem, listener);
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46 table.addListener(DWT.PaintItem, listener);
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47 }
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48
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49 /**
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50 * Stores the styled ranges in the given table item.
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51 *
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52 * @param item table item
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53 * @param column the column index
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54 * @param ranges the styled ranges or <code>null</code> to remove them
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55 */
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56 public static void storeStyleRanges(TableItem item, int column, StyleRange[] ranges) {
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57 item.setData(STYLED_RANGES_KEY + column, ranges);
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58 }
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59
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60 /**
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61 * Returns the styled ranges which are stored in the given table item.
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62 *
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63 * @param item table item
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64 * @param column the column index
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65 * @return the styled ranges
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66 */
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67 private static StyleRange[] getStyledRanges(TableItem item, int column) {
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68 return (StyleRange[])item.getData(STYLED_RANGES_KEY + column);
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69 }
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70
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71 private TableOwnerDrawSupport(Table table) {
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72 int orientation= table.getStyle() & (DWT.LEFT_TO_RIGHT | DWT.RIGHT_TO_LEFT);
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73 fLayout= new TextLayout(table.getDisplay());
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74 fLayout.setOrientation(orientation);
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75 }
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76
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77 /*
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78 * @see dwt.widgets.Listener#handleEvent(dwt.widgets.Event)
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79 */
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80 public void handleEvent(Event event) {
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81 switch (event.type) {
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82 case DWT.MeasureItem:
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83 break;
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84 case DWT.EraseItem:
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85 event.detail &= ~DWT.FOREGROUND;
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86 break;
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87 case DWT.PaintItem:
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88 performPaint(event);
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89 break;
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90 case DWT.Dispose:
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91 widgetDisposed();
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92 break;
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93 }
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94 }
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95
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96 /**
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97 * Performs the paint operation.
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98 *
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99 * @param event the event
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100 */
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101 private void performPaint(Event event) {
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102 TableItem item= (TableItem) event.item;
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103 GC gc= event.gc;
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104 int index= event.index;
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105
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106 bool isSelected= (event.detail & DWT.SELECTED) !is 0;
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107
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108 // Remember colors to restore the GC later
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109 Color oldForeground= gc.getForeground();
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110 Color oldBackground= gc.getBackground();
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111
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112 if (!isSelected) {
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113 Color foreground= item.getForeground(index);
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114 gc.setForeground(foreground);
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115
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116 Color background= item.getBackground(index);
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117 gc.setBackground(background);
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118 }
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119
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120 Image image=item.getImage(index);
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121 if (image !is null) {
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122 Rectangle imageBounds=item.getImageBounds(index);
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123 Rectangle bounds=image.getBounds();
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124 int x=imageBounds.x + Math.max(0, (imageBounds.width - bounds.width) / 2);
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125 int y=imageBounds.y + Math.max(0, (imageBounds.height - bounds.height) / 2);
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126 gc.drawImage(image, x, y);
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127 }
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128
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129 fLayout.setFont(item.getFont(index));
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130
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131 // XXX: needed to clear the style info, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=226090
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132 fLayout.setText(""); //$NON-NLS-1$
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133
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134 fLayout.setText(item.getText(index));
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135
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136 StyleRange[] ranges= getStyledRanges(item, index);
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137 if (ranges !is null) {
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138 for (int i= 0; i < ranges.length; i++) {
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139 StyleRange curr= ranges[i];
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140 if (isSelected) {
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141 curr= (StyleRange) curr.clone();
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142 curr.foreground= null;
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143 curr.background= null;
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144 }
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145 fLayout.setStyle(curr, curr.start, curr.start + curr.length - 1);
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146 }
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147 }
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148
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149 Rectangle textBounds=item.getTextBounds(index);
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150 if (textBounds !is null) {
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151 Rectangle layoutBounds=fLayout.getBounds();
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152 int x=textBounds.x;
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153 int y=textBounds.y + Math.max(0, (textBounds.height - layoutBounds.height) / 2);
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154 fLayout.draw(gc, x, y);
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155 }
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156
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157 if ((event.detail & DWT.FOCUSED) !is 0) {
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158 Rectangle focusBounds=item.getBounds();
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159 gc.drawFocus(focusBounds.x, focusBounds.y, focusBounds.width, focusBounds.height);
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160 }
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161
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162 if (!isSelected) {
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163 gc.setForeground(oldForeground);
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164 gc.setBackground(oldBackground);
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165 }
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166 }
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167
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168 private void widgetDisposed() {
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169 fLayout.dispose();
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170 }
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171 }
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172
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