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Setting a clip mask on a NSView

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Setting a clip mask on a NSView

Subject: Setting a clip mask on a NSView
From: Timothy Wall <email@hidden>
Date: Sat, 26 Jan 2008 16:23:51 -0500

Hi all,

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.

The current situation is that I have some heavyweight Java components (i.e. they have an associated native peer component) that need to be clipped by a sibling component which is *not* heavyweight (i.e. it paints into its ancestor's graphics area). On w32 and X11, native peers are windows, which can have a clip mask set so that only part of the window gets painted and/or responds to events. I'd like to do a similar thing on OSX, but the native peer is a NSView, and I don't know how to change its shape.

Thanks
T.


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