Is it possible to set an arbitrary clip mask on an NSView without
rewriting its drawRect? The goal is to be able to clip/obscure
parts of a NSView without necessarily putting anything in front of
it.
You mention an "arbitrary" mask, but the next paragraph makes me
think that a rectangular mask may be enough. If that's the case,
you could stick your NSView inside an NSClipView, then set the
clipping origin with -scrollToPoint: (it will take the size from
the clip view).
Imagine I'm writing my own "mini-desktop" within a window (like
windows multi-document interface). Most of the time the clipping
would be sets of rectangles, but it'd be possible to have one of the
"desktop" elements be non-rectangular.
Cocoa doesn't like the idea of "in front of" (overlapping views
aren't supported, except in layer-backed Core Animation); the
paradigm is more "inside of".
That doesn't sound promising.
If you do need arbitrary clipping (circles or the like), you could
implement your own clipview-like class, but you might not save much
as you'd still have to call -drawRect: and pass it a rectangle (you
could do some calculations and call it multiple times with multiple
rects).
So the "canonical" way to clip a given NSView is to have an ancestor
do the clipping? It might be possible to insert a shim parent to
the component in question.
Thanks
T.
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