test/jdk/javax/swing/JInternalFrame/5066752/bug5066752.java

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/*
  @test
  @key headful
  @bug 5066752
  @summary  Transparent JDesktopPane impossible because isOpaque() returns true
  @author mb50250: area=JDesktopPane
  @library ../../regtesthelpers
  @build Util
  @run main bug5066752
*/

import java.awt.*;
import javax.swing.*;

public class bug5066752
{
    private static JFrame frame;

    public static void main(String[] args) throws Exception {
        try {
            Robot r = new Robot();
            SwingUtilities.invokeAndWait(new Runnable() {
                public void run() {
                    createAndShowGUI();
                }
            });
            r.waitForIdle();

            r.delay(600);

            Point p = Util.getCenterPoint(frame);
            Color color =  r.getPixelColor((int) p.getX(), (int) p.getY());
            if (!color.equals(Color.RED)) {
                throw new Exception("Test failed: JDesktopPane isn't transparent. Expected color is (red color): " + Color.RED + ", actual color is: " + color);
            }
        } finally {
            if (frame != null) SwingUtilities.invokeAndWait(() -> frame.dispose());
        }
    }

    private static void createAndShowGUI() {
        frame = new JFrame();

        frame.setLayout(new BorderLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        panel.setBackground(Color.RED);
        frame.add(panel, BorderLayout.CENTER);

        JDesktopPane dp = new JDesktopPane();
        dp.setOpaque(false);
        panel.add(dp, BorderLayout.CENTER);

        frame.setBounds(200, 200, 300, 200);
        frame.setVisible(true);
    }
}