/* @test

   @bug 6726866

   @summary Repainting artifacts when resizing or dragging JInternalFrames in non-opaque toplevel

   @author Alexander Potochkin

   @run applet/manual=yesno bug6726866.html

*/

import javax.swing.*;

import java.awt.*;

import java.lang.reflect.Method;

public class bug6726866 extends JApplet {

    public void init() {

        JFrame frame = new JFrame("bug6726866");

        frame.setUndecorated(true);

        setWindowNonOpaque(frame);

        JDesktopPane desktop = new JDesktopPane();

        desktop.setBackground(Color.GREEN);

        JInternalFrame iFrame = new JInternalFrame("Test", true, true, true, true);

        iFrame.add(new JLabel("internal Frame"));

        iFrame.setBounds(10, 10, 300, 200);

        iFrame.setVisible(true);

        desktop.add(iFrame);

        frame.add(desktop);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setSize(400, 400);

        frame.setVisible(true);

        frame.toFront();

    }

    private void setWindowNonOpaque(Window w) {

        try {

            Class<?> c = Class.forName("com.sun.awt.AWTUtilities");

            Method m = c.getMethod("setWindowOpaque", Window.class, boolean.class);

            m.invoke(null, w, false);

        }

        catch (Exception e) {

            e.printStackTrace();

        }

    }

}