/*

 * Copyright (c) 2016, 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.Dimension;

import java.awt.Point;

import java.awt.Robot;

import java.awt.event.InputEvent;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextArea;

import javax.swing.SwingUtilities;

/**

 * @test

 * @key headful

 * @bug 8149849

 * @summary [hidpi] DnD issues (cannot DnD from JFileChooser to JEditorPane or

 *          other text component) when scale > 1

 * @run main/othervm -Dsun.java2d.uiScale=2 DNDTextToScaledArea

 */

public class DNDTextToScaledArea {

    private static final String TEXT = "ABCDEFGH";

    private static JFrame frame;

    private static JTextArea srcTextArea;

    private static JTextArea dstTextArea;

    private static volatile Point srcPoint;

    private static volatile Point dstPoint;

    private static volatile boolean passed = false;

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

        Robot robot = new Robot();

        robot.setAutoDelay(50);

        SwingUtilities.invokeAndWait(DNDTextToScaledArea::createAndShowGUI);

        robot.waitForIdle();

        SwingUtilities.invokeAndWait(() -> {

            srcPoint = getPoint(srcTextArea, 0.1);

            dstPoint = getPoint(dstTextArea, 0.75);

        });

        robot.waitForIdle();

        dragAndDrop(robot, srcPoint, dstPoint);

        robot.waitForIdle();

        SwingUtilities.invokeAndWait(() -> {

            passed = TEXT.equals(dstTextArea.getText());

            frame.dispose();

        });

        robot.waitForIdle();

        if (!passed) {

            throw new RuntimeException("Text Drag and Drop failed!");

        }

    }

    private static void createAndShowGUI() {

        frame = new JFrame();

        frame.setSize(300, 300);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel(new BorderLayout());

        srcTextArea = new JTextArea(TEXT);

        srcTextArea.setDragEnabled(true);

        srcTextArea.selectAll();

        dstTextArea = new JTextArea();

        panel.add(dstTextArea, BorderLayout.CENTER);

        panel.add(srcTextArea, BorderLayout.SOUTH);

        frame.getContentPane().add(panel);

        frame.setVisible(true);

    }

    private static Point getPoint(Component component, double scale) {

        Point point = component.getLocationOnScreen();

        Dimension bounds = component.getSize();

        point.translate((int) (bounds.width * scale), (int) (bounds.height * scale));

        return point;

    }

    public static void dragAndDrop(Robot robot, Point src, Point dst) throws Exception {

        int x1 = src.x;

        int y1 = src.y;

        int x2 = dst.x;

        int y2 = dst.y;

        robot.mouseMove(x1, y1);

        robot.mousePress(InputEvent.BUTTON1_MASK);

        float dmax = (float) Math.max(Math.abs(x2 - x1), Math.abs(y2 - y1));

        float dx = (x2 - x1) / dmax;

        float dy = (y2 - y1) / dmax;

        for (int i = 0; i <= dmax; i += 5) {

            robot.mouseMove((int) (x1 + dx * i), (int) (y1 + dy * i));

        }

        robot.mouseRelease(InputEvent.BUTTON1_MASK);

    }

}