/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

 */

import java.awt.BorderLayout;

import java.awt.Component;

import java.awt.KeyboardFocusManager;

import java.awt.Robot;

import java.awt.event.KeyEvent;

import java.util.HashSet;

import java.util.Set;

import javax.swing.ButtonGroup;

import javax.swing.FocusManager;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.JTextField;

import javax.swing.KeyStroke;

import javax.swing.LookAndFeel;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

public class FocusTraversal {

    private static JFrame frame;

    private static JRadioButton a;

    private static JRadioButton b;

    private static JRadioButton c;

    private static JRadioButton d;

    private static JTextField next;

    private static JTextField prev;

    private static Robot robot;

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

        robot = new Robot();

        robot.waitForIdle();

        UIManager.LookAndFeelInfo[] lookAndFeelArray

                = UIManager.getInstalledLookAndFeels();

        for (UIManager.LookAndFeelInfo lookAndFeelItem : lookAndFeelArray) {

            executeCase(lookAndFeelItem.getClassName());

        }

    }

    private static void executeCase(String lookAndFeelString)

            throws Exception {

        if (tryLookAndFeel(lookAndFeelString)) {

            createUI(lookAndFeelString);

            robot.waitForIdle();

            runTestCase();

            robot.waitForIdle();

            cleanUp();

            robot.waitForIdle();

        }

    }

    private static void createUI(final String lookAndFeelString)

            throws Exception {

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                Set<KeyStroke> keystrokes = new HashSet<KeyStroke>();

                keystrokes.add(KeyStroke.getKeyStroke("TAB"));

                keystrokes.add(KeyStroke.getKeyStroke("ENTER"));

                frame = new JFrame("FocusTraversalTest " + lookAndFeelString);

                frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

                frame.setUndecorated(true);

                frame.setFocusTraversalKeys(

                        KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,

                        keystrokes);

                a = new JRadioButton("a");

                b = new JRadioButton("b");

                c = new JRadioButton("c");

                d = new JRadioButton("d");

                ButtonGroup radioButtonGroup = new ButtonGroup();

                radioButtonGroup.add(a);

                radioButtonGroup.add(b);

                radioButtonGroup.add(c);

                radioButtonGroup.add(d);

                JPanel panel = new JPanel();

                prev = new JTextField("text");

                panel.add(prev);

                panel.add(a);

                panel.add(b);

                panel.add(c);

                panel.add(d);

                next = new JTextField("text");

                panel.add(next);

                JPanel root = new JPanel();

                root.setLayout(new BorderLayout());

                root.add(panel, BorderLayout.CENTER);

                root.add(new JButton("OK"), BorderLayout.SOUTH);

                frame.add(root);

                frame.pack();

                frame.setLocationRelativeTo(null);

                frame.setVisible(true);

                frame.toFront();

            }

        });

    }

    private static void runTestCase() throws Exception {

        LookAndFeel lookAndFeel = UIManager.getLookAndFeel();

        focusOn(a);

        if (isExcludedLookAndFeel(lookAndFeel)) {

            robot.keyPress(KeyEvent.VK_ENTER);

            robot.keyRelease(KeyEvent.VK_ENTER);

            robot.waitForIdle();

            isFocusOwner(b, "forward");

            robot.keyPress(KeyEvent.VK_SHIFT);

            robot.keyPress(KeyEvent.VK_TAB);

            robot.keyRelease(KeyEvent.VK_TAB);

            robot.keyRelease(KeyEvent.VK_SHIFT);

            robot.waitForIdle();

            isFocusOwner(a, "backward");

        } else {

            robot.keyPress(KeyEvent.VK_ENTER);

            robot.keyRelease(KeyEvent.VK_ENTER);

            robot.waitForIdle();

            isFocusOwner(next, "forward");

            robot.keyPress(KeyEvent.VK_SHIFT);

            robot.keyPress(KeyEvent.VK_TAB);

            robot.keyRelease(KeyEvent.VK_TAB);

            robot.keyRelease(KeyEvent.VK_SHIFT);

            robot.waitForIdle();

            isFocusOwner(d, "backward");

        }

    }

    private static boolean isExcludedLookAndFeel(LookAndFeel lookAndFeel) {

        return lookAndFeel.toString().toLowerCase().contains("aqua")

                || lookAndFeel.toString().toLowerCase().contains("nimbus")

                || lookAndFeel.toString().toLowerCase().contains("gtk");

    }

    private static void focusOn(Component component)

            throws Exception {

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                component.requestFocusInWindow();

            }

        });

    }

    private static void isFocusOwner(Component queriedFocusOwner,

            String direction)

            throws Exception {

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                Component actualFocusOwner

                        = FocusManager.getCurrentManager().getFocusOwner();

                if (actualFocusOwner != queriedFocusOwner) {

                    frame.dispose();

                    throw new RuntimeException(

                            "Focus component is wrong after " + direction

                            + " direction ");

                }

            }

        });

    }

    private static boolean tryLookAndFeel(String lookAndFeelString)

            throws Exception {

        try {

            UIManager.setLookAndFeel(

                    lookAndFeelString);

        } catch (UnsupportedLookAndFeelException

                | ClassNotFoundException

                | InstantiationException

                | IllegalAccessException e) {

            return false;

        }

        return true;

    }

    private static void cleanUp() throws Exception {

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                frame.dispose();

            }

        });

    }

}