To let the user decide to enable such an option is OK.
However I think possibly there still exists a performance bug. The test case
below causes an avererage of 5% CPU utilization for opaque window and 50% CPU
utilization for non-opaque windows even if the animated panel is placed on an
opaque panel (tested on the older machine).
[code]
public class NonOpaqueWindowPerformanceTest extends JFrame
{
public NonOpaqueWindowPerformanceTest()
{
super();
setLayout(new BorderLayout());
JPanel p = new JPanel();
p.setBorder(new LineBorder(Color.GREEN));
p.setBackground(Color.RED);
p.setOpaque(true);
final JPanel p2 = new JPanel();
p2.setOpaque(true);
p2.setBorder(new LineBorder(Color.blue));
p2.setPreferredSize(new Dimension(300,300));
p.add(p2);
add(p);
//remarking the following line means 90% less CPU-utilization on Windows XP
setWindowNonOpaque(this);
setTitle(getClass().getSimpleName());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(800, 600);
setLocationRelativeTo(null);
setVisible(true);
new Thread(){
public void run()
{
while (true)
{
try
{
Thread.sleep(50);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
EventQueue.invokeLater(new Runnable()
{
public void run()
{
Color color = new Color(new Random().nextInt(0xFFFFFF));
p2.setBackground(color);
}
});
}
}
}.start();
}
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 NonOpaqueWindowPerformanceTest();
}
});
}
}
[/code]
[Message sent by forum member 'wzberger' (wzberger)]
http://forums.java.net/jive/thread.jspa?messageID=287511
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