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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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 * D Port:
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11 * Bill Baxter <wbaxter@gmail.com>
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12 *******************************************************************************/
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13 module org.eclipse.swt.snippets.Snippet226;
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14
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15 /*
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16 * Tree example snippet: Draw a custom gradient selection
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17 *
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18 * For a list of all SWT example snippets see
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19 * http://www.eclipse.org/swt/snippets/
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20 *
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21 * @since 3.3
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22 */
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23 import org.eclipse.swt.SWT;
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24 import org.eclipse.swt.graphics.GC;
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25 import org.eclipse.swt.graphics.Rectangle;
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26 import org.eclipse.swt.graphics.Region;
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27 import org.eclipse.swt.graphics.Color;
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28 import org.eclipse.swt.layout.FillLayout;
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29 import org.eclipse.swt.widgets.Display;
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30 import org.eclipse.swt.widgets.Shell;
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31 import org.eclipse.swt.widgets.Tree;
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32 import org.eclipse.swt.widgets.TreeItem;
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33 import org.eclipse.swt.widgets.TreeColumn;
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34 import org.eclipse.swt.widgets.Listener;
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35 import org.eclipse.swt.widgets.Event;
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36
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112
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37 version(Tango){
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38 import tango.util.Convert;
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39 } else { // Phobos
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40 import std.conv;
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41 }
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28
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42
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43 import java.lang.all;
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44
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45 void main()
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46 {
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112
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47 Display display = new Display();
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48 Shell shell = new Shell(display);
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49 shell.setText("Custom gradient selection for Tree");
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50 shell.setLayout(new FillLayout());
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112
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51 Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION);
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28
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52 tree.setHeaderVisible(true);
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53 tree.setLinesVisible(true);
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54 int columnCount = 4;
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55 for (int i=0; i<columnCount; i++) {
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56 auto istr = to!(String)(i);
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57 TreeColumn column = new TreeColumn(tree, SWT.NONE);
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58 column.setText("Column " ~ istr);
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59 }
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60 int itemCount = 3;
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61 for (int i=0; i<itemCount; i++) {
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62 auto istr = to!(String)(i);
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63 TreeItem item1 = new TreeItem(tree, SWT.NONE);
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64 item1.setText("item "~istr);
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65 for (int c=1; c < columnCount; c++) {
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66 auto cstr = to!(String)(c);
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67 item1.setText(c, "item ["~istr~"-"~cstr~"]");
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68 }
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69 for (int j=0; j<itemCount; j++) {
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70 auto jstr = to!(String)(j);
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71 TreeItem item2 = new TreeItem(item1, SWT.NONE);
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72 item2.setText("item ["~istr~" "~jstr~"]");
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73 for (int c=1; c<columnCount; c++) {
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74 auto cstr = to!(String)(c);
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75 item2.setText(c, "item ["~istr~" "~jstr~"-"~cstr~"]");
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76 }
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77 for (int k=0; k<itemCount; k++) {
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78 auto kstr = to!(String)(k);
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79 TreeItem item3 = new TreeItem(item2, SWT.NONE);
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80 item3.setText("item ["~istr~" "~jstr~" "~kstr~"]");
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81 for (int c=1; c<columnCount; c++) {
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82 auto cstr = to!(String)(c);
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83 item3.setText(c, "item ["~istr~" "~jstr~" "~kstr~"-"~cstr~"]");
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84 }
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85 }
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86 }
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87 }
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88
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89 /*
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90 * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
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91 * Therefore, it is critical for performance that these methods be
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92 * as efficient as possible.
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93 */
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94 tree.addListener(SWT.EraseItem, new class Listener {
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95 public void handleEvent(Event event) {
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96 event.detail &= ~SWT.HOT;
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97 if ((event.detail & SWT.SELECTED) != 0) {
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98 GC gc = event.gc;
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99 Rectangle area = tree.getClientArea();
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100 /*
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101 * If you wish to paint the selection beyond the end of
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102 * last column, you must change the clipping region.
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103 */
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104 int columnCount = tree.getColumnCount();
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105 if (event.index == columnCount - 1 || columnCount == 0) {
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106 int width = area.x + area.width - event.x;
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107 if (width > 0) {
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108 Region region = new Region();
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109 gc.getClipping(region);
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110 region.add(event.x, event.y, width, event.height);
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111 gc.setClipping(region);
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112 region.dispose();
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113 }
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114 }
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115 gc.setAdvanced(true);
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116 if (gc.getAdvanced()) gc.setAlpha(127);
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117 Rectangle rect = event.getBounds();
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118 Color foreground = gc.getForeground();
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119 Color background = gc.getBackground();
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120 gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
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121 gc.setBackground(display.getSystemColor(SWT.COLOR_LIST_BACKGROUND));
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122 gc.fillGradientRectangle(0, rect.y, 500, rect.height, false);
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123 // restore colors for subsequent drawing
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124 gc.setForeground(foreground);
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125 gc.setBackground(background);
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126 event.detail &= ~SWT.SELECTED;
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127 }
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128 }
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129 });
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130 for (int i=0; i<columnCount; i++) {
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131 tree.getColumn(i).pack();
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132 }
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133 tree.setSelection(tree.getItem(0));
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134 shell.setSize(500, 200);
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135 shell.open();
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136 while (!shell.isDisposed()) {
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137 if (!display.readAndDispatch()) display.sleep();
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138 }
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139 display.dispose();
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140 }
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