Name: gm110360 Date: 05/03/2004


FULL PRODUCT VERSION :
java version "1.4.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_01-b01)
Java HotSpot(TM) Client VM (build 1.4.1_01-b01, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Windows 98 [Version 4.10.1998]


A DESCRIPTION OF THE PROBLEM :
Resizing a frame causes rapid flickering when JFrame.setDefaultLookAndFeelDecorated(true) is used.

This thread from the Swing forum has input from other users using different OSes and JDK's.
http://forum.java.sun.com/thread.jsp?forum=57&thread=503874


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) Run the program
2) Drag the frame border to make it wider

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Frame should resize without flickering.
ACTUAL -
Contents of the frame flicker while frame is being resized.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class BugDecorated extends JFrame
{
    public BugDecorated()
    {
        JTable table = new JTable(5, 5);
        table.setPreferredScrollableViewportSize( table.getPreferredSize() );
        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
    }

    public static void main(String[] args)
    {
        // Comment the following line and it resizes without flickering
        JFrame.setDefaultLookAndFeelDecorated(true);
//
        BugDecorated frame = new BugDecorated();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
    }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Adding a ComponentListener to the frame and setting a System property as shown below seems to work reasonably well.

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

public class BugDecorated extends JFrame
{
    public BugDecorated()
    {
        JTable table = new JTable(5, 5);
        table.setPreferredScrollableViewportSize( table.getPreferredSize() );
        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );

addComponentListener(new ComponentAdapter()
{
public void componentResized(ComponentEvent e)
{
getRootPane().repaint();
}
});

    }

    public static void main(String[] args)
    {
        // Comment the following line and it resizes without flickering
        JFrame.setDefaultLookAndFeelDecorated(true);
        System.setProperty("sun.awt.noerasebackground", "true");
//
        BugDecorated frame = new BugDecorated();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
    }
}
(Incident Review ID: 244160)
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