| /******************************************************************************* |
| * 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.setText("Snippet 202"); |
| 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 (); |
| } |
| } |