Mega Code Archive
Populate tree lazily
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/*******************************************************************************
* Copyright (c) 2000, 2005 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;
/*
* Virtual Tree example snippet: populate tree lazily
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreePopulateLazy {
public static void main(String[] args) {
Display display = new Display();
final Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
final Tree tree = new Tree(shell, SWT.VIRTUAL | SWT.BORDER);
tree.addListener(SWT.SetData, new Listener() {
public void handleEvent(Event event) {
TreeItem item = (TreeItem) event.item;
TreeItem parentItem = item.getParentItem();
String text = null;
if (parentItem == null) {
text = "node " + tree.indexOf(item);
} else {
text = parentItem.getText() + " - " + parentItem.indexOf(item);
}
item.setText(text);
item.setItemCount(10);
}
});
tree.setItemCount(20);
shell.setSize(400, 300);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
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