Name: jk109818 Date: 08/19/2002


FULL PRODUCT VERSION :

java full version "1.4.1-beta"

and

java full version "1.4.0-b92"

and

java full version "1.3.1-b24"

FULL OPERATING SYSTEM VERSION : win2k sp 2


ADDITIONAL OPERATING
SYSTEMS :



A DESCRIPTION OF THE PROBLEM :

JScrollBar always fires at least 2 AdjustmentEvents
whenever you
scroll; one for the mouse down and one
for the mouse up. There doesn't
appear to be any way
to distinguish between the original and duplicate
event.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile and run the attached code
2. Single left click on the
scrollbar
3. Note that there's two events. If you hold the mouse
button
down it will continue to scroll and when you release the
mouse
button you'll see a duplicate of the last event.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

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

public class ScrollBug extends
JPanel implements AdjustmentListener {

    ScrollBug() {
        JScrollBar sbar = new
JScrollBar(JScrollBar.HORIZONTAL);

        sbar.setMinimum(0);
        sbar.setMaximum(100);
        
sbar.setValue(50);

        sbar.addAdjustmentListener(this);
        add(sbar);
    }

    public
void adjustmentValueChanged(AdjustmentEvent e) {
        
System.out.println("adjustmentValueChanged: " + e.getValue());
    }

    public static void
main(String [] args) {
        JFrame frame = new JFrame("scrollbar bug");

        
frame.getContentPane().add(new ScrollBug());
        frame.pack();
        
frame.setVisible(true);
    }
}
---------- END SOURCE ----------
(Review ID: 160743)
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