jdk-24/test/jdk/java/awt/ScrollPane/ScrollPaneLimitation.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 *
 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/*
  @test
  @bug 4046446
  @requires os.family=="windows"
  @summary Tests 16-bit limitations of scroll pane, child's position and size
  and mouse coordinates
  @key headful
*/

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Point;
import java.awt.Robot;
import java.awt.ScrollPane;

import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class ScrollPaneLimitation {
    static final int SCROLL_POS = 50000;
    public static Component child = null;
    static final CountDownLatch go = new CountDownLatch(1);
    public Frame frame;
    volatile Point point;
    ScrollPane pane;

    public static void main(String[] args) throws Exception {
        ScrollPaneLimitation scrollTest = new ScrollPaneLimitation();
        scrollTest.init();
        scrollTest.start();
    }

    public void init() throws Exception {
        EventQueue.invokeAndWait(() -> {
            frame = new Frame("Scroll Pane Limitation");
            frame.setLayout(new BorderLayout());
            pane = new ScrollPane();
            frame.add(pane);
            child = new MyPanel();
            child.addMouseListener(new MouseAdapter() {
                public void mousePressed(MouseEvent e) {
                    if (e.getID() == MouseEvent.MOUSE_PRESSED
                            && e.getSource() == ScrollPaneLimitation.child
                            && e.getY() > SCROLL_POS) {
                        go.countDown();
                    }
                }
            });
            pane.add(child);
            frame.setSize(200, 200);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setAlwaysOnTop(true);
            frame.setVisible(true);
            pane.doLayout();
        });
    }

    public void start() throws Exception {
        try {
            Robot robot = new Robot();
            robot.waitForIdle();
            robot.delay(1000);

            EventQueue.invokeAndWait(() -> {
                Point p = child.getLocation();
                System.out.println("Child's initial location " + p);
                System.out.println("Pane's insets " + pane.getInsets());
                pane.setScrollPosition(0, SCROLL_POS);
                p = pane.getScrollPosition();
                System.out.println("Scroll pos = " + p);
                if (p.y != SCROLL_POS) {
                    throw new RuntimeException("wrong scroll position");
                }
                p = child.getLocation();
                System.out.println("Child pos = " + p);
                if (p.y != -SCROLL_POS) {
                    if (child.isLightweight()) {
                        // If it is lightweight it will always have (0, 0) location.
                        // Check location of its parent - it is Panel and it should
                        // be at (inset left, inset top + position)
                        Container cp = child.getParent();
                        p = cp.getLocation();
                        System.out.println("Child's parent pos = " + p);
                        if (p.y != -SCROLL_POS) {
                            throw new RuntimeException("wrong child location");
                        }
                    } else {
                        throw new RuntimeException("wrong child location");
                    }
                }

                p = pane.getLocationOnScreen();
                Dimension d = pane.getSize();
                point = new Point(p.x + d.width / 2, p.y + d.height / 2);
            });
            robot.mouseMove(point.x, point.y);
            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);

            if (!go.await(3, TimeUnit.SECONDS)) {
                throw new RuntimeException("mouse was not pressed");
            }
        } finally {
            EventQueue.invokeAndWait(() -> {
                if (frame != null) {
                    frame.dispose();
                }
            });
        }
    }

    private static class MyPanel extends Component {
        public Dimension getPreferredSize() {
            return new Dimension(100, 100000);
        }
    }
}