ButtonGroupLayoutTraversalTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * questions.
 */

/*
  @test
  @bug 8154043
  @summary Fields not reachable anymore by tab-key, because of new tabbing
  behaviour of radio button groups.
  @run main ButtonGroupLayoutTraversalTest
*/

import javax.swing.*;
import java.awt.*;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;

public class ButtonGroupLayoutTraversalTest {
    static int nx = 3;
    static int ny = 3;

    static int focusCnt[] = new int[nx * ny];
    private static JFrame window;


    public static void main(String[] args) throws Exception {

        SwingUtilities.invokeAndWait(()->initLayout(nx, ny));
        Robot robot = new Robot();
        robot.setAutoDelay(100);
        robot.waitForIdle();
        robot.delay(200);


        for(int i = 0; i < nx * ny - nx * ny / 2 - 1; i++) {
            robot.keyPress(KeyEvent.VK_RIGHT);
            robot.keyRelease(KeyEvent.VK_RIGHT);
        }

        for(int i = 0; i < nx * ny / 2; i++) {
            robot.keyPress(KeyEvent.VK_TAB);
            robot.keyRelease(KeyEvent.VK_TAB);
        }

        robot.waitForIdle();
        robot.delay(200);

        for(int i = 0; i < nx * ny; i++) {
            if(focusCnt[i] < 1) {
                SwingUtilities.invokeLater(window::dispose);
                throw new RuntimeException("Component " + i +
                        " is not reachable in the forward focus cycle");
            } else if (focusCnt[i] > 1) {
                SwingUtilities.invokeLater(window::dispose);
                throw new RuntimeException("Component " + i +
                        " got focus more than once in the forward focus cycle");
            }
        }

        for(int i = 0; i < nx * ny / 2; i++) {
            robot.keyPress(KeyEvent.VK_SHIFT);
            robot.keyPress(KeyEvent.VK_TAB);
            robot.keyRelease(KeyEvent.VK_TAB);
            robot.keyRelease(KeyEvent.VK_SHIFT);
        }

        for(int i = 0; i < nx * ny - nx * ny / 2 - 1; i++) {
            robot.keyPress(KeyEvent.VK_LEFT);
            robot.keyRelease(KeyEvent.VK_LEFT);
        }

        robot.keyPress(KeyEvent.VK_SHIFT);
        robot.keyPress(KeyEvent.VK_TAB);
        robot.keyRelease(KeyEvent.VK_TAB);
        robot.keyRelease(KeyEvent.VK_SHIFT);

        robot.waitForIdle();
        robot.delay(200);

        for(int i = 0; i < nx * ny; i++) {
            if(focusCnt[i] < 2) {
                SwingUtilities.invokeLater(window::dispose);
                throw new RuntimeException("Component " + i +
                        " is not reachable in the backward focus cycle");
            } else if (focusCnt[i] > 2) {
                SwingUtilities.invokeLater(window::dispose);
                throw new RuntimeException("Component " + i +
                        " got focus more than once in the backward focus cycle");
            }
        }

        SwingUtilities.invokeLater(window::dispose);
    }

    public static void initLayout(int nx, int ny)
    {
        window = new JFrame("Test");
        window.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        JPanel rootPanel = new JPanel();
        rootPanel.setLayout(new BorderLayout());
        JPanel formPanel = new JPanel(new GridLayout(nx, ny));
        formPanel.setFocusTraversalPolicy(new LayoutFocusTraversalPolicy());
        formPanel.setFocusCycleRoot(true);
        ButtonGroup radioButtonGroup = new ButtonGroup();
        for(int i = 0; i < nx * ny; i++) {
            JToggleButton comp;
            if(i % 2 == 0) {
                comp = new JRadioButton("Grouped component");
                radioButtonGroup.add(comp);
            } else {
                comp = new JRadioButton("Single component");
            }
            formPanel.add(comp);
            int fi = i;
            comp.setBackground(Color.red);
            comp.addFocusListener(new FocusAdapter() {
                @Override
                public void focusGained(FocusEvent e) {
                    focusCnt[fi]++;
                    if( focusCnt[fi] == 1) {
                        ((JComponent) e.getSource())
                                .setBackground(Color.yellow);
                    } else if(focusCnt[fi] == 2) {
                        ((JComponent) e.getSource())
                                .setBackground(Color.green);
                    } else {
                        ((JComponent) e.getSource())
                                .setBackground(Color.red);
                    }
                }
            });
        }
        rootPanel.add(formPanel, BorderLayout.CENTER);
        window.add(rootPanel);
        window.pack();
        window.setVisible(true);
    }
}