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/*******************************************************************************
* 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.NONE);
itemI.setText("Item " + i);
for (int j = 0; j < 4; j++) {
TreeItem itemJ = new TreeItem(itemI, SWT.NONE);
itemJ.setText("Item " + i + " " + j);
for (int k = 0; k < 4; k++) {
TreeItem itemK = new TreeItem(itemJ, SWT.NONE);
itemK.setText("Item " + i + " " + j + " " + k);
}
}
}
tree.setSize(200, 200);
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
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