org.eclipse.swt.snippets.Snippet202.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet202.java

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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.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();
    }
}