org.eclipse.swt.snippets.Snippet21.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet21.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;

/*
 * Canvas example snippet: implement tab traversal (behave like a tab group)
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;

public class Snippet21 {

    public static void main(String[] args) {
        Display display = new Display();
        final Color red = display.getSystemColor(SWT.COLOR_RED);
        final Color blue = display.getSystemColor(SWT.COLOR_BLUE);
        Shell shell = new Shell(display);
        shell.setText("Snippet 21");
        Button b = new Button(shell, SWT.PUSH);
        Rectangle clientArea = shell.getClientArea();
        b.setBounds(clientArea.x + 10, clientArea.y + 10, 100, 32);
        b.setText("Button");
        shell.setDefaultButton(b);
        final Canvas c = new Canvas(shell, SWT.BORDER);
        c.setBounds(10, 50, 100, 32);
        c.addListener(SWT.Traverse, e -> {
            switch (e.detail) {
            /* Do tab group traversal */
            case SWT.TRAVERSE_ESCAPE:
            case SWT.TRAVERSE_RETURN:
            case SWT.TRAVERSE_TAB_NEXT:
            case SWT.TRAVERSE_TAB_PREVIOUS:
            case SWT.TRAVERSE_PAGE_NEXT:
            case SWT.TRAVERSE_PAGE_PREVIOUS:
                e.doit = true;
                break;
            }
        });
        c.addListener(SWT.FocusIn, e -> c.setBackground(red));
        c.addListener(SWT.FocusOut, e -> c.setBackground(blue));
        c.addListener(SWT.KeyDown, e -> System.out.println("KEY"));
        Text t = new Text(shell, SWT.SINGLE | SWT.BORDER);
        t.setBounds(10, 85, 100, 32);

        Text r = new Text(shell, SWT.MULTI | SWT.BORDER);
        r.setBounds(10, 120, 100, 32);

        c.setFocus();
        shell.setSize(200, 200);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}