test/jdk/javax/swing/JComponent/bug4247610.java

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/*
 * @test
 * @bug 4247610
 * @summary Tests an unnecessary repaint issue
 * @key headful
 * @run main bug4247610
 */

import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Robot;
import java.awt.event.InputEvent;
import javax.swing.JButton;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.Random;

public class bug4247610 {

    private static JFrame frame;
    private static JButton damager;
    private static volatile Point loc;
    private static volatile Dimension size;
    private static volatile boolean traced;
    private static volatile boolean failed;

    public static void main(String[] args) throws Exception {
        Robot robot = new Robot();
        SwingUtilities.invokeAndWait(() -> {
            frame = new JFrame("bug4247610");
            JDesktopPane pane = new JDesktopPane();

            JInternalFrame jif = new JInternalFrame(
                                 "Damager", true, true, true, true);
            InternalFramePanel ifp = new InternalFramePanel();
            damager = new JButton("Damage!");
            ifp.add(damager);
            jif.setContentPane(ifp);
            jif.setBounds(0, 0, 300, 300);
            jif.setVisible(true);
            pane.add(jif);

            jif = new JInternalFrame("Damagee", true, true, true, true);
            JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT));
            final JLabel damagee = new JLabel("");
            panel.add(damagee);
            jif.setContentPane(panel);
            jif.setBounds(60, 220, 300, 100);
            jif.setVisible(true);
            pane.add(jif);

            final Random random = new Random();

            damager.addActionListener((e) -> {
                System.out.println("trace paints enabled");
                traced = true;
                damagee.setText(Integer.toString(random.nextInt()));
            });
            frame.setContentPane(pane);
            frame.setSize(500, 500);
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });
        robot.waitForIdle();
        robot.delay(1000);
        SwingUtilities.invokeAndWait(() -> {
            loc = damager.getLocationOnScreen();
            size = damager.getSize();
        });
        robot.mouseMove(loc.x + size.width / 2, loc.y + size.height / 2);
        robot.waitForIdle();
        robot.delay(200);
        robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
        robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
        if (failed) {
            throw new RuntimeException("Failed: unnecessary repaint occured");
        }
    }


    static class InternalFramePanel extends JPanel {
        final AtomicInteger repaintCounter = new AtomicInteger(0);
        InternalFramePanel() {
            super(new FlowLayout());
            setOpaque(true);
        }

        public synchronized void paintComponent(Graphics g) {
            super.paintComponent(g);
            repaintCounter.incrementAndGet();
            System.out.println("repaintCounter " + repaintCounter.intValue());
            if (traced) {
                failed = true;
            }
        }
    }
}