jdk-24/test/jdk/java/awt/Window/TranslucentJAppletTest/TranslucentJAppletTest.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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
 * @key headful
 * @bug 6683728
 * @summary Tests that a JApplet in a translucent JFrame works properly
 * @compile -XDignore.symbol.file=true TranslucentJAppletTest.java
 * @run main/othervm -Dsun.java2d.uiScale=1 TranslucentJAppletTest
 */

import java.awt.*;
import java.awt.image.*;

import javax.swing.*;

public class TranslucentJAppletTest {

    private static volatile GraphicsConfiguration graphicsConfig = null;
    private static JFrame frame;
    private static volatile boolean paintComponentCalled = false;

    private static void initAndShowGUI() {
        frame = new JFrame(graphicsConfig);
        JApplet applet = new JApplet();
        applet.setBackground(new Color(0, 0, 0, 0));
        JPanel panel = new JPanel() {
            protected void paintComponent(Graphics g) {
                paintComponentCalled = true;
                g.setColor(Color.RED);
                g.fillOval(0, 0, getWidth(), getHeight());
            }
        };
        panel.setDoubleBuffered(false);
        panel.setOpaque(false);
        applet.add(panel);
        frame.add(applet);
        frame.setBounds(100, 100, 200, 200);
        frame.setUndecorated(true);
        frame.setBackground(new Color(0, 0, 0, 0));
        frame.setVisible(true);
    }

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

        final GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        for (GraphicsDevice gd : ge.getScreenDevices()) {
            if (gd.isWindowTranslucencySupported(
                        GraphicsDevice.WindowTranslucency.PERPIXEL_TRANSLUCENT))
            {
                for (GraphicsConfiguration gc : gd.getConfigurations()) {
                    if (gc.isTranslucencyCapable()) {
                        graphicsConfig = gc;
                        break;
                    }
                }
            }
            if (graphicsConfig != null) {
                break;
            }
        }
        if (graphicsConfig == null) {
            System.out.println("The system does not support translucency. Consider the test passed.");
            return;
        }

        Robot r = new Robot();
        Color color1 = r.getPixelColor(100, 100); // (0, 0) in frame coordinates

        SwingUtilities.invokeAndWait(new Runnable() {
            public void run() {
                initAndShowGUI();
            }
        });
        r.waitForIdle();

        if (!paintComponentCalled) {
            throw new RuntimeException("Test FAILED: panel's paintComponent() method is not called");
        }
        Thread.sleep(1500);

        Color newColor1 = r.getPixelColor(100, 100);
        Color newColor2 = r.getPixelColor(200, 200);

        // Frame must be transparent at (100, 100) in screen coords
        if (!color1.equals(newColor1)) {
            System.err.println("color1 = " + color1);
            System.err.println("newColor1 = " + newColor1);
            throw new RuntimeException("Test FAILED: frame pixel at (0, 0) is not transparent");
        }

        // Frame must be RED at (200, 200) in screen coords
        if (!newColor2.equals(Color.RED)) {
            System.err.println("newColor2 = " + newColor2);
            throw new RuntimeException("Test FAILED: frame pixel at (100, 100) is not red (transparent?)");
        }

        System.out.println("Test PASSED");
    }
}