org.eclipse.swt.snippets.Snippet313.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet313.java

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/*******************************************************************************
 * Copyright (c) 2009, 2013 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;

/*
 * FormLayout example snippet: use a form layout to hide/show a composite
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.5
 */
import static org.eclipse.swt.events.SelectionListener.*;

import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet313 {
    public static void main(String[] args) {
        Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setText("Snippet 313");
        shell.setLayout(new FormLayout());

        final Button button = new Button(shell, SWT.PUSH);
        button.setText(">>");
        FormData data = new FormData();
        data.top = new FormAttachment(0, 4);
        data.right = new FormAttachment(100, -4);
        button.setLayoutData(data);

        final Composite composite = new Composite(shell, SWT.BORDER);
        final FormData down = new FormData();
        down.top = new FormAttachment(button, 4, SWT.BOTTOM);
        down.bottom = new FormAttachment(100, -4);
        down.left = new FormAttachment(0, 4);
        down.right = new FormAttachment(100, -4);
        final FormData up = new FormData();
        up.top = new FormAttachment(0);
        up.bottom = new FormAttachment(0);
        up.left = new FormAttachment(0);
        up.right = new FormAttachment(0);
        composite.setLayoutData(up);

        button.addSelectionListener(widgetSelectedAdapter(e -> {
            if (composite.getLayoutData() == up) {
                composite.setLayoutData(down);
                button.setText("<<");
            } else {
                composite.setLayoutData(up);
                button.setText(">>");
            }
            shell.pack();
        }));

        shell.pack();
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}