Hi,
I want my window to appear partially transparent. So I thought I could
simply listen to kEventWindowGetRegion and return a custom region
when kEventParamWindowRegionCode is kWindowOpaqueRgn. This
approach is presented here:
http://developer.apple.com/samplecode/CarbonTransparentWindow/index.html
However, the region I set during kEventWindowGetRegion is not respected
by CopyBits(). I'm doing all my drawing using CopyBits() and it is not
done inside a HIView. I.e. my drawing is not restricted to the scope of
the kEventControlDraw event. The window is non-composited.
So my question would be: If I want the window to have transparent parts,
do I have to use a HIView control and then restrict all drawing operations
(i.e. in my case all calls to CopyBits()) to the scope of kEventControlDraw
of that HIView?
I would really like to avoid this because it would involve major changes
in my program structure. I would really like to be able to draw whenever
I want but CopyBits() should not draw over the transparent areas in my
window. Is this possible somehow? Maybe with CreateCustomWindow()?
Tks
Andreas
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