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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.Snippet220;
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14
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15 /*
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16 * Tree example snippet: Images on the right side of the TreeItem
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17 *
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18 * For a detailed explanation of this snippet see
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19 * http://www.eclipse.org/articles/Article-CustomDrawingTableAndTreeItems/customDraw.htm#_example5
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20 *
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21 * For a list of all SWT example snippets see
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22 * http://www.eclipse.org/swt/snippets/
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23 *
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24 * @since 3.2
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25 */
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26
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27 import org.eclipse.swt.SWT;
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28 import org.eclipse.swt.graphics.Image;
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29 import org.eclipse.swt.graphics.GC;
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30 import org.eclipse.swt.widgets.Display;
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31 import org.eclipse.swt.widgets.Shell;
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32 import org.eclipse.swt.widgets.Listener;
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33 import org.eclipse.swt.widgets.Event;
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34 import org.eclipse.swt.widgets.Tree;
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35 import org.eclipse.swt.widgets.TreeItem;
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36
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37 import tango.util.Convert;
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38
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39 version(JIVE){
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40 import jive.stacktrace;
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41 }
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42
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43 void main() {
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44 const int IMAGE_MARGIN = 2;
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45 void handleEventMeasureItem(Event event) {
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46 TreeItem item = cast(TreeItem)event.item;
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47 Image trailingImage = cast(Image)item.getData();
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48 if (trailingImage !is null) {
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49 int w1 = event.width;
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50 event.width += trailingImage.getBounds().width + IMAGE_MARGIN;
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51 int w2 = event.width;
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52 }
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53 }
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54 void handleEventPaintItem(Event event, Tree tree ) {
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55 TreeItem item = cast(TreeItem)event.item;
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56 Image trailingImage = cast(Image)item.getData();
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57 if (trailingImage !is null) {
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58 int x = event.x + event.width + IMAGE_MARGIN;
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59 int itemHeight = tree.getItemHeight();
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60 int imageHeight = trailingImage.getBounds().height;
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61 int y = event.y + (itemHeight - imageHeight) / 2;
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62 event.gc.drawImage(trailingImage, x, y);
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63 }
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64 }
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65 Display display = new Display();
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66 Shell shell = new Shell(display);
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67 shell.setBounds(10, 10, 350, 200);
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68 Image xImage = new Image (display, 16, 16);
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69 GC gc = new GC(xImage);
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70 gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
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71 gc.drawLine(1, 1, 14, 14);
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72 gc.drawLine(1, 14, 14, 1);
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73 gc.drawOval(2, 2, 11, 11);
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74 gc.dispose();
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75 Tree tree = new Tree(shell, SWT.CHECK);
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76 tree.setBounds(10, 10, 300, 150);
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77 TreeItem item = new TreeItem(tree, SWT.NONE);
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78 item.setText("root item");
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79 for (int i = 0; i < 4; i++) {
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80 TreeItem newItem = new TreeItem(item, SWT.NONE);
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81 newItem.setText("descendent " ~ to!(char[])(i));
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82 if (i % 2 == 0) newItem.setData(xImage);
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83 item.setExpanded(true);
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84 item = newItem;
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85 }
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86
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87 /*
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88 * NOTE: MeasureItem and PaintItem are called repeatedly. Therefore it is
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89 * critical for performance that these methods be as efficient as possible.
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90 */
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91 tree.addListener(SWT.MeasureItem, dgListener( &handleEventMeasureItem ));
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92 tree.addListener(SWT.PaintItem,dgListener( &handleEventPaintItem, tree ));
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93
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94 shell.open();
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95 while (!shell.isDisposed()) {
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96 if (!display.readAndDispatch()) display.sleep();
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97 }
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98 xImage.dispose();
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99 display.dispose();
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100 }
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