org.eclipse.swt.snippets.Snippet315.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet315.java

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

/*
 * Button example snippet: create a tri-state button (toggle three states)
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.5
 */
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet315 {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 315");
        shell.setLayout(new GridLayout());
        final Button button = new Button(shell, SWT.CHECK);
        button.setLayoutData(
                new GridData(GridData.GRAB_VERTICAL | GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_CENTER));
        button.setText("Tri-state");
        /* Make the button toggle between three states */
        button.addListener(SWT.Selection, e -> {
            if (button.getSelection()) {
                if (!button.getGrayed()) {
                    button.setGrayed(true);
                }
            } else {
                if (button.getGrayed()) {
                    button.setGrayed(false);
                    button.setSelection(true);
                }
            }
        });
        /* Read the tri-state button (application code) */
        button.addListener(SWT.Selection, e -> {
            if (button.getGrayed()) {
                System.out.println("Grayed");
            } else {
                if (button.getSelection()) {
                    System.out.println("Selected");
                } else {
                    System.out.println("Not selected");
                }
            }
        });
        shell.setSize(300, 300);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}