panel autoscroll problem

[Tim Bücker]

Hello.

I have a problem with a graphic error that shows up when scrolling a
picturebox within a panel which AutoScroll property is set to true.
As until now nobody could help me and I didn´t find anything suspicious by
myself it has to be a bug in .NET ;-)

I wrote a little test scenario (7 KB) that can be found here:
www.uni-koblenz.de/~hagbard/PanelScrollingBug.zip
(A test bitmap called test.bmp must reside in C:\ by default)

Thanks a lot for looking into the zip file and for ANY comment about this
problem.
Greetings,
Tim.

 

[Herfried K. Wagner [MVP]]

I have a problem with a graphic error that shows up when scrolling a
picturebox within a panel which AutoScroll property is set to true.
As until now nobody could help me and I didn´t find anything suspicious by
myself it has to be a bug in .NET ;-)

Only to make sure I experience the same problem as you: When scrolling,
sometimes parts of the image are not drawn?

 

[Tim Bücker]

Only to make sure I experience the same problem as you: When scrolling,
sometimes parts of the image are not drawn?

Hello.

First of all, thanks for answering!
Yes, one could describe the problem like that or that some parts are
overlapping other parts.

Do you have an idea?
Greetings,
Tim.

 

[Herfried K. Wagner [MVP]]

First of all, thanks for answering!
Yes, one could describe the problem like that or that some parts are
overlapping other parts.

I played around with it and I am not able to find the reason for this behavior.

What you can do is trying to handle the panel's scroll events
(<URL:http://dotnet.mvps.org/dotnet/faqs/downloads/panelscrollevent.txt>)
and force an update of the picturebox every time the scrollbars are moved.

 

[Tim Bücker]

I played around with it and I am not able to find the reason for this behavior.

What you can do is trying to handle the panel's scroll events
(<URL:http://dotnet.mvps.org/dotnet/faqs/downloads/panelscrollevent.txt>)
and force an update of the picturebox every time the scrollbars are moved.

Ok, thanks a lot for trying!
I´ll try your idea - but now I really want to know why this is happening!
;-)

Greetings,
Tim.

 

[Tim Bücker]

What you can do is trying to handle the panel's scroll events [...]

That worked!
But I still want to know the reason for this "bug". So if you´ll ever know
;-)

Greetings and thanks,
Tim.