| /******************************************************************************* |
| * Copyright (c) 2000, 2007 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.snippets; |
| |
| /* |
| * Tree snippet: implement standard tree check box behavior (SWT.CHECK) |
| * |
| * For a list of all SWT example snippets see |
| * http://www.eclipse.org/swt/snippets/ |
| * |
| * @since 3.3 |
| */ |
| import org.eclipse.swt.*; |
| import org.eclipse.swt.widgets.*; |
| |
| public class Snippet274 { |
| |
| static void checkPath(TreeItem item, boolean checked, boolean grayed) { |
| if (item == null) return; |
| if (grayed) { |
| checked = true; |
| } else { |
| int index = 0; |
| TreeItem[] items = item.getItems(); |
| while (index < items.length) { |
| TreeItem child = items[index]; |
| if (child.getGrayed() || checked != child.getChecked()) { |
| checked = grayed = true; |
| break; |
| } |
| index++; |
| } |
| } |
| item.setChecked(checked); |
| item.setGrayed(grayed); |
| checkPath(item.getParentItem(), checked, grayed); |
| } |
| |
| static void checkItems(TreeItem item, boolean checked) { |
| item.setGrayed(false); |
| item.setChecked(checked); |
| TreeItem[] items = item.getItems(); |
| for (int i = 0; i < items.length; i++) { |
| checkItems(items[i], checked); |
| } |
| } |
| |
| public static void main(String[] args) { |
| Display display = new Display(); |
| Shell shell = new Shell(display); |
| Tree tree = new Tree(shell, SWT.BORDER | SWT.CHECK); |
| tree.addListener(SWT.Selection, new Listener() { |
| public void handleEvent(Event event) { |
| if (event.detail == SWT.CHECK) { |
| TreeItem item = (TreeItem) event.item; |
| boolean checked = item.getChecked(); |
| checkItems(item, checked); |
| checkPath(item.getParentItem(), checked, false); |
| } |
| } |
| }); |
| for (int i = 0; i < 4; i++) { |
| TreeItem itemI = new TreeItem(tree, SWT.NULL); |
| itemI.setText("Item " + i); |
| for (int j = 0; j < 4; j++) { |
| TreeItem itemJ = new TreeItem(itemI, SWT.NULL); |
| itemJ.setText("Item " + i + " " + j); |
| for (int k = 0; k < 4; k++) { |
| TreeItem itemK = new TreeItem(itemJ, SWT.NULL); |
| itemK.setText("Item " + i + " " + j + " " + k); |
| } |
| } |
| } |
| tree.setSize(200, 200); |
| shell.pack(); |
| shell.open(); |
| while (!shell.isDisposed()) { |
| if (!display.readAndDispatch()) display.sleep(); |
| } |
| display.dispose(); |
| } |
| |
| } |