/*

 * 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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import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Point;

import java.awt.Rectangle;

import java.awt.Robot;

import java.awt.event.InputEvent;

import java.awt.image.BufferedImage;

import javax.swing.JDesktopPane;

import javax.swing.JFrame;

import javax.swing.JInternalFrame;

import javax.swing.SwingUtilities;

/**

 * @test

 * @key headful

 * @summary Dragged internal frame leaves artifacts for floating point ui scale

 * @run main/othervm -Dsun.java2d.uiScale=1.2 JInternalFrameDraggingTest

 * @run main/othervm -Dsun.java2d.uiScale=1.5 JInternalFrameDraggingTest

 * @run main/othervm -Dsun.java2d.uiScale=1 JInternalFrameDraggingTest

 * @run main/othervm -Dsun.java2d.uiScale=2.5 JInternalFrameDraggingTest

 */

public class JInternalFrameDraggingTest {

    private static JFrame frame;

    private static JDesktopPane desktopPane;

    private static JInternalFrame internalFrame;

    private static int FRAME_SIZE = 500;

    private static Color BACKGROUND_COLOR = Color.ORANGE;

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

        Robot robot = new Robot();

        robot.setAutoDelay(20);

        SwingUtilities.invokeAndWait(JInternalFrameDraggingTest::createAndShowGUI);

        robot.waitForIdle();

        final int translate = FRAME_SIZE / 4;

        moveFrame(robot, translate, translate / 2, translate / 2);

        robot.waitForIdle();

        Point p = getDesktopPaneLocation();

        int size = translate / 2;

        Rectangle rect = new Rectangle(p.x, p.y, size, size);

        BufferedImage img = robot.createScreenCapture(rect);

        int testRGB = BACKGROUND_COLOR.getRGB();

            int rgbCW = img.getRGB(i, size / 2);

            int rgbCH = img.getRGB(size / 2, i);

            if (rgbCW != testRGB || rgbCH != testRGB) {

                throw new RuntimeException("Background color is wrong!");

            }

        }

    }

    private static void createAndShowGUI() {

        frame = new JFrame();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setLayout(new BorderLayout());

        desktopPane = new JDesktopPane();

        desktopPane.setBackground(BACKGROUND_COLOR);

        frame.add(desktopPane, BorderLayout.CENTER);

        frame.setSize(FRAME_SIZE, FRAME_SIZE);

        frame.setVisible(true);

        internalFrame = new JInternalFrame("Test");

        internalFrame.setSize(FRAME_SIZE / 2, FRAME_SIZE / 2);

        desktopPane.add(internalFrame);

        internalFrame.setVisible(true);

        internalFrame.setResizable(true);

        frame.setVisible(true);

    }

    private static void moveFrame(Robot robot, int w, int h, int N) throws Exception {

        Point p = getInternalFrameLocation();

        int xs = p.x + 100;

        int ys = p.y + 15;

        robot.mouseMove(xs, ys);

        try {

            robot.mousePress(InputEvent.BUTTON1_MASK);

            int dx = w / N;

            int dy = h / N;

            int y = ys;

            for (int x = xs; x < xs + w; x += dx, y += dy) {

                robot.mouseMove(x, y);

            }

        } finally {

            robot.mouseRelease(InputEvent.BUTTON1_MASK);

        }

    }

    private static Point getInternalFrameLocation() throws Exception {

        final Point[] points = new Point[1];

        SwingUtilities.invokeAndWait(() -> {

            points[0] = internalFrame.getLocationOnScreen();

        });

        return points[0];

    }

    private static Point getDesktopPaneLocation() throws Exception {

        final Point[] points = new Point[1];

        SwingUtilities.invokeAndWait(() -> {

            points[0] = desktopPane.getLocationOnScreen();

        });

        return points[0];

    }

}