Name: jk109818 Date: 09/24/2002


FULL PRODUCT VERSION :
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

FULL OPERATING SYSTEM VERSION :
glibc-2.2.4-19.3
Kernel version 2.4.9-31
Red Hat Linux release 7.2 (Enigma)

ADDITIONAL OPERATING SYSTEMS :


EXTRA RELEVANT SYSTEM CONFIGURATION :
Microtouch and Elographics touchscreens, configured using TSI'S
xtouch and XFree86's elographics drivers respectively. These make the
screen touch events look like mouse clicks to X.

A DESCRIPTION OF THE PROBLEM :
When running a PC (Linux, X Windows) equipped with a
touchscreen, Swing sometimes loses the mouse release events. A
mouse listener or EventQueue will see a MOUSE_PRESSED event
but no matching MOUSE_RELEASED event. Visually, the button
will get pressed but never released (until touched again).
  Programmatically, the button's action listeners will never get their
actionPerformed() called.

This could be caused by the event sequence being different with a
touchscreen. A screen touch will trigger in X a mouse pressed event
followed by a mouse move event followed by a mouse released
event. When clicking with a mouse, a mouse pressed event is
followed immediately by a mouse released event.

While this does not happen often, users are much put off by this.
When they push a button, they expect some sort of action. For a
button to push in but do nothing is confusing. Yet a
touchscreen-based GUI needs to be button intensive.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the included source code and tap the button on a touchscreen for
a couple of minutes. Eventually, you will see the button push in but not
back out.

EXPECTED VERSUS ACTUAL BEHAVIOR :
All button depressions should pop back up. Occasionally, the button
will seem to get stuck.

REPRODUCIBILITY :
This bug can be reproduced rarely.

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

class foo
{
   static public void main(String[] args)
   {
      JFrame frame = new JFrame();
      Container content = frame.getContentPane();
      content.add(new JButton("Push me!"));
      frame.setVisible(true);
   }
}
---------- END SOURCE ----------
(Review ID: 164920)
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