Did you try setting the window's clip region to the same region you
returned to kEventWindowGetRegion?
Or passing this region to CopyBits as the maskRgn parameter?
I've never attempted either of these, just curious.
On Oct 27, 2007, at 4:35 AM, Andreas Falkenhahn wrote:
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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