[Pnet-developers] Bugfix (?) in Xsharp/DoubleBuffer.cs

[Marc Haisenko]

Hi folks,
just wanted to let you know I've just committed a small patch to 
Xsharp/DoubleBuffer.cs.

Until now, DoubleBuffer.ClearAtStart only cleared the background when Xdbe (X 
DoubleBuffer Extension) was not in use. Now we clear the background either 
when Xdbe is not in use OR when it is in use but the background is empty.

This fixes yet another bug we're seeing in the Trumpf prototype that I'm 
unfortunately not able to reproduce with test applications... this bug looked 
like this: in the prototype is a list with complex compound widgets. They 
have a transparent TcLabel (Trumpf implementation of a label, effectively 
derived from a SWF.Control) on the left. The background of this compound 
widget is dark blue. When it gets the focus the background gets yellow.

The bug we were seeing is a bit hard to describe, it looked like this: the 
compound widget received the focus and turned yellow, but the TcLabel stayed 
blue. Now when you click on the next compound widget and it gets the focus 
and turns yellow, the TcLabel of the first compound widget went yellow while 
the one of the currently focused one still is blue. This means the TcLabel 
was always "one behind" when focusing. Hiding and unhiding the window makes 
the compound widget render correctly. So does turning off 
ControlStyle.DoubleBuffer for the TcLabel... This bug is also appearing with 
another Trumpf control with transparent background (an image button) in this 
compound widget.

I guess this patch doesn't break anything but I'm not sure whether it is the 
"best" way to fix the bug but it seems to work ;-)

C'ya,
        Marc

-- 
Marc Haisenko
http://darkdust.net
Today is Prickle-Prickle, the 69th day of Chaos in the YOLD 3171

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