/*

 * Copyright (c) 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.

 */

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.EventQueue;

import java.awt.Point;

import java.awt.Robot;

import java.awt.event.InputEvent;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.TimeUnit;

import javax.swing.JFrame;

import javax.swing.JPanel;

/**

 * @test

 * @key headful

 * @bug 8202768

 * @summary we should not hang when lots of panels are used

 */

public final class SlowPanelIteration {

    private static JFrame frame;

    private static Point center = new Point();

    private static volatile CountDownLatch go;

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

        Robot r = new Robot();

        // accessibility tool will need time to react to our clicks

        r.setAutoDelay(200);

        try {

            EventQueue.invokeAndWait(SlowPanelIteration::showUI);

            for (int i = 0; i < 10; ++i) {

                go = new CountDownLatch(1);

                r.mouseMove(center.x, center.y);

                r.mousePress(InputEvent.BUTTON1_DOWN_MASK);

                r.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);

                if (!go.await(10, TimeUnit.SECONDS)) {

                    throw new RuntimeException("Too slow operation");

                }

            }

        } finally {

            EventQueue.invokeAndWait(SlowPanelIteration::dispose);

        }

    }

    private static void showUI() {

        frame = new JFrame();

        frame.setSize(new Dimension(400, 400));

        frame.setLocationRelativeTo(null);

        final Container content = frame.getContentPane();

        content.setLayout(new BorderLayout(0, 0));

        Container lastPanel = content;

        for (int i = 0; i < 500; i++) {

            final JPanel p = new JPanel();

            p.setLayout(new BorderLayout(0, 0));

            lastPanel.add(p);

            lastPanel.addMouseListener(new MouseAdapter() {

                @Override

                public void mouseClicked(MouseEvent e) {

                    System.out.println("click");

                    go.countDown();

                }

            });

            lastPanel = p;

        }

        lastPanel.setBackground(Color.GREEN);

        frame.setVisible(true);

        Point loc = frame.getLocationOnScreen();

        center.x = loc.x + frame.getWidth() / 2;

        center.y = loc.y + frame.getHeight() / 2;

    }

    private static void dispose() {

        if (frame != null) {

            frame.dispose();

        }

    }

}