/*

 * Copyright (c) 2017, 2018, 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.

 */

/*

 * @test

 * @bug 8191639 8196443

 * @key headful

 * @summary  Verifies no NPE is thrown when pageup/down is pressed in a JList

 * @run main BasicListTest

 */

import java.awt.Point;

import java.awt.Rectangle;

import java.awt.Robot;

import java.awt.event.InputEvent;

import java.awt.event.KeyEvent;

import javax.swing.JFrame;

import javax.swing.JList;

import javax.swing.JScrollPane;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

class MyList extends JList {

    // I need this to be able to unselect when clicking outside list content

    @Override

    public int locationToIndex(final Point location) {

        final int n = super.locationToIndex(location);

        //return n;

        final Rectangle q = getCellBounds(n, n);

        return q != null && q.contains(location)?n:-1;

    }

}

public class BasicListTest {

    private static void initComponents() {

        f = new JFrame();

        jScrollPane1 = new JScrollPane();

        list1 = new MyList();

        f.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        list1.setModel(new javax.swing.AbstractListModel() {

            String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };

            @Override

            public int getSize() { return strings.length; }

            @Override

            public Object getElementAt(int i) { return strings[i]; }

        });

        jScrollPane1.setViewportView(list1);

        f.getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);

        f.pack();

        f.setVisible(true);

        p = list1.getLocationOnScreen();

    }

    private static void setLookAndFeel(final UIManager.LookAndFeelInfo laf) {

        try {

            UIManager.setLookAndFeel(laf.getClassName());

        } catch (ClassNotFoundException | InstantiationException |

                 UnsupportedLookAndFeelException | IllegalAccessException e) {

            throw new RuntimeException(e);

        }

    }

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

        for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {

            try {

                SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));

                System.out.println("Test for LookAndFeel " + laf.getClassName());

                SwingUtilities.invokeAndWait(() -> {

                    initComponents();

                });

                System.out.println("Test passed for LookAndFeel " + laf.getClassName());

            }  catch (Exception e) {

                throw new RuntimeException(e);

            }

            Robot robot = new Robot();

            robot.setAutoDelay(200);

            robot.mouseMove(p.x, p.y);

            robot.waitForIdle();

            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);

            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);

            robot.waitForIdle();

            robot.keyPress(KeyEvent.VK_PAGE_DOWN);

            robot.keyRelease(KeyEvent.VK_PAGE_DOWN);

            try {

                Thread.sleep(1000);

            } catch (InterruptedException ex) {

            }

            SwingUtilities.invokeAndWait(() -> {

                f.dispose();

            });

        }

    }

    private static JScrollPane jScrollPane1;

    private static MyList list1;

    private static Point p;

    private static JFrame f;

}