As discussed in this thread:
http://forums.java.net/jive/thread.jspa?threadID=43881&tstart=0
The following test case shows rendering artifacts in non-opaque toplevels
when JInternalFrames are used:
public class NonOpaqueWindowTest2 extends JFrame
{
public NonOpaqueWindowTest2()
{
super();
setWindowNonOpaque(this);
JDesktopPane desktop = new JDesktopPane();
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);
getContentPane().add(desktop);
setTitle(getClass().getSimpleName());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(400, 400);
setLocationRelativeTo(null);
setVisible(true);
}
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();
}
}
public static void main(String[] args) throws Exception
{
EventQueue.invokeLater(new Runnable(){
public void run()
{
JFrame.setDefaultLookAndFeelDecorated(true);
new NonOpaqueWindowTest2();
}
});
}
}
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Java