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/*******************************************************************************
* Copyright (c) 2000, 2016 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
/*
* Virtual Tree example snippet: create a virtual tree (lazy)
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.2
*/
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
public class Snippet202 {
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, 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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