/*

 * Copyright (c) 2012, 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 4697612 6244705

 * @author Peter Zhelezniakov

 * @library ../../regtesthelpers

 * @build Util

 * @run main bug4697612

 */

import java.io.*;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.text.BadLocationException;

public class bug4697612 {

    static final int FRAME_WIDTH = 300;

    static final int FRAME_HEIGHT = 300;

    static final int FONT_HEIGHT = 16;

    private static volatile int frameHeight;

    private static volatile int fontHeight;

    private static JFrame frame;

    private static JTextArea text;

    private static JScrollPane scroller;

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

        Robot robot = new Robot();

        robot.setAutoDelay(100);

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                createAndShowGUI();

            }

        });

        robot.waitForIdle();

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                text.requestFocus();

            }

        });

        robot.waitForIdle();

        // 4697612: pressing PgDn + PgUp should not alter caret position

        Util.hitKeys(robot, KeyEvent.VK_HOME);

        Util.hitKeys(robot, KeyEvent.VK_PAGE_DOWN);

        int pos0 = getTextCaretPosition();

        int caretHeight = getTextCaretHeight();

        fontHeight = FONT_HEIGHT;

        // iterate two times, for different (even and odd) font height

        for (int i = 0; i < 2; i++) {

            SwingUtilities.invokeAndWait(new Runnable() {

                public void run() {

                    text.setFont(text.getFont().deriveFont(fontHeight));

                }

            });

            frameHeight = FRAME_HEIGHT;

            for (int j = 0; j < caretHeight; j++) {

                SwingUtilities.invokeAndWait(new Runnable() {

                    public void run() {

                        frame.setSize(FRAME_WIDTH, frameHeight);

                    }

                });

                robot.waitForIdle();

                Util.hitKeys(robot, KeyEvent.VK_PAGE_DOWN);

                Util.hitKeys(robot, KeyEvent.VK_PAGE_UP);

                robot.waitForIdle();

                int pos = getTextCaretPosition();

                if (pos0 != pos) {

                    throw new RuntimeException("Failed 4697612: PgDn & PgUp keys scroll by different amounts");

                }

                frameHeight++;

            }

            fontHeight++;

        }

        // 6244705: pressing PgDn at the very bottom should not scroll

        LookAndFeel laf = UIManager.getLookAndFeel();

        if (laf.getID().equals("Aqua")) {

            Util.hitKeys(robot, KeyEvent.VK_END);

        } else {

            Util.hitKeys(robot, KeyEvent.VK_CONTROL, KeyEvent.VK_END);

        }

        robot.waitForIdle();

        pos0 = getScrollerViewPosition();

        Util.hitKeys(robot, KeyEvent.VK_PAGE_DOWN);

        robot.waitForIdle();

        int pos = getScrollerViewPosition();

        if (pos0 != pos) {

            throw new RuntimeException("Failed 6244705: PgDn at the bottom causes scrolling");

        }

    }

    private static int getTextCaretPosition() throws Exception {

        final int[] result = new int[1];

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                result[0] = text.getCaretPosition();

            }

        });

        return result[0];

    }

    private static int getTextCaretHeight() throws Exception {

        final int[] result = new int[1];

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                try {

                    int pos0 = text.getCaretPosition();

                    Rectangle dotBounds = text.modelToView(pos0);

                    result[0] = dotBounds.height;

                } catch (BadLocationException ex) {

                    throw new RuntimeException(ex);

                }

            }

        });

        return result[0];

    }

    private static int getScrollerViewPosition() throws Exception {

        final int[] result = new int[1];

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                result[0] = scroller.getViewport().getViewPosition().y;

            }

        });

        return result[0];

    }

    private static void createAndShowGUI() {

        frame = new JFrame();

        frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);

        frame.setPreferredSize(new Dimension(FRAME_WIDTH, FRAME_HEIGHT));

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        text = new JTextArea();

        try {

            InputStream is =

                    bug4697612.class.getResourceAsStream("bug4697612.txt");

            text.read(new InputStreamReader(is), null);

        } catch (IOException e) {

            throw new Error(e);

        }

        scroller = new JScrollPane(text);

        frame.getContentPane().add(scroller);

        frame.pack();

        frame.setVisible(true);

    }

}