[Mono-winforms-list] Bad TrackBar flicker in

Jonathan Pobst monkey at jpobst.com
Fri Sep 25 21:09:53 EDT 2009

LKeene wrote:
> I'm getting very bad visual behavior form the TrackBar control on Mono +
> Windows when the thumb is dragged back and forth. The thumb completely
> disappears and only reappears on mouse up. This behavior is in both 2.2 and
> 2.4, maybe others. I believe this behavior is present when running on OSX as
> well.
> Is this a known issue? Any suggestions anyone? As always, thanks!
> -L

The default TrackBar seems to work fine for me:
Mono on Win7 64-bit

I don't know if you are using a different setting on it that is causing 
it to behave poorly.

You can try inheriting it to a custom TrackBar and set DoubleBuffered to 
true and see if that helps.  If that helps, we may need to double buffer 
it even though .Net reports that DoubleBuffered is false for TrackBar.


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