org.eclipse.swt.snippets.Snippet292.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet292.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;

/*
 * Take a snapshot of a control
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.4
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet292 {
    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setText("Snippet 292");
        final Group group = new Group(shell, SWT.NONE);
        group.setText("Group");
        group.setLayout(new GridLayout());
        final Tree tree = new Tree(group, SWT.BORDER);
        for (int i = 0; i < 5; i++) {
            TreeItem treeItem = new TreeItem(tree, SWT.NONE);
            treeItem.setText("TreeItem " + i);
            for (int j = 0; j < 3; j++) {
                TreeItem subItem = new TreeItem(treeItem, SWT.NONE);
                subItem.setText("SubItem " + i + "-" + j);
            }
            if (i % 3 == 0)
                treeItem.setExpanded(true);
        }
        new Button(group, SWT.PUSH).setText("Button");
        final Label label = new Label(shell, SWT.NONE);
        label.addListener(SWT.Dispose, e -> {
            Image image = label.getImage();
            if (image != null)
                image.dispose();
        });
        Button button = new Button(shell, SWT.PUSH);
        button.setText("Snapshot");
        button.addListener(SWT.Selection, e -> {
            Image image = label.getImage();
            if (image != null)
                image.dispose();
            image = new Image(display, group.getBounds());
            GC gc = new GC(image);
            boolean success = group.print(gc);
            gc.dispose();
            label.setImage(image);
            if (!success) {
                MessageBox messageBox = new MessageBox(shell, SWT.OK | SWT.PRIMARY_MODAL);
                messageBox.setMessage("Sorry, taking a snapshot is not supported on your platform");
                messageBox.open();
            }
        });
        GridLayout layout = new GridLayout(2, true);
        shell.setLayout(layout);
        group.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        label.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
        button.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 2, 1));
        shell.pack();
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}