Name: diC59631 Date: 11/03/97


In jdk 1.1.4, a simple scrollbar totally flakes
out and locks up if used. This was reported many
times in the past, but someone has closed all the
bug reports with a comment of "I don't know what
the fix was, but it is no longer visible...."

He doesn't know what the fix was because there was
no fix. By closing the bug report, and a half
dozen others he claims are duplicates, he makes it
impossible for us to vote to have this thing
fixed once and for all.

The only thing I can think of is just to report
it as a "new bug", though it's really a request
to reopen one that should never have been closed:

Bug Id 4063785 and all of its "duplicates".

This is *not* fixed as of JDK 1.1.4! You can claim
it is a "known Windows bug" if you like, [cf. your
notes accompanying Bug Id 4028490], but if so,
then find the "known Windows workaround" that apparently
everyone else in the Win32 world is using, because this
behavior is not observable in any other Windows app
I have ever used.

The scrollbar used to take off and scroll itself wildly
if you clicked on it several times in rapid succession.
As of Java 1.1.3, it appears as though the scrollbar
simply goes catatonic and virtually ceases to function
at all after the first click. If a scrollbar that locks up
and won't move at all qualifies as a fix for a scrollbar
that takes off and wildly scrolls itself, then I apologize.
Consider it closed. I don't think I would have closed a
bug in my own code with a fix like that, though.

It is completely repeatable in JDK 1.1.4 on Win95
and in the new Visual Cafe Pro 2.0 which uses Java 1.1.3.

Once again, here's a complete standalone
app that makes the problem 100% reproducible on
my Win95 machine. It's about as simple as a GUI app can be,
just a scrollbar and a textfield showing the value.

Run it on a Win95 machine, play with the scrollbar,
and see for yourself what we are all talking about. I'm
not surprised that your licensees are pestering you
to get it fixed. [cf. your notes on bug 4063785].
Standalone scrollbars (AWT.Scrollbar) have been
seriously broken since alpha 3, and never seem to
get any better. Please, do a search on your bug
database for the word "scrollbar" and notice just how *many*
bugs a simple scrollbar manages to have in Java.

A scrollbar with a range of 0-100 should go from
0-100. All the controls on the scrollbar should work.
The page size setting adjustment should work. The
slider size adjustment should work. Just like any Win32 app.

Your voting system (which I applaud) ends up spreading
out all the scrollbar votes over a *lot* of bug
reports, and prevents us from voting for the
ones that you've accidentally closed, so it's
hard to get scrollbars to stay on your radar
long enough to get fixed.

Please, give us a simple, working scrollbar.

Thank you.


Here's the code:

import java.awt.*;
import java.awt.event.*;

public class Scroller extends Frame implements AdjustmentListener
{
    TextField tf;
    Scrollbar sb;
    
    public Scroller()
    {
        setTitle("Scrollbar Bug");
        
        tf = new TextField("");
        add("Center",tf);
        
        sb = new Scrollbar(Scrollbar.HORIZONTAL, 0, 10, 0, 100);
        add("South",sb);
        
        sb.addAdjustmentListener(this);
        
        WindowListener wl = new WindowAdapter()
        {
            public void windowClosing(WindowEvent e)
            {
                System.exit(0);
            }
        };
        addWindowListener(wl);
    }
    
    public void adjustmentValueChanged(AdjustmentEvent evt)
    {
        tf.setText(String.valueOf(evt.getValue()));
    }

    public static void main(String[] args)
    {
       Scroller test = new Scroller();
       test.resize(320, 200);
       test.setVisible(true);
    }
}

Some additional Info...

win95 4.00.950a with the Microsoft plus pack

Also have microsofts kernel update installed.
(Review ID: 18889)
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