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Drawing a focus ring around an NSScrollView? (drawing glitches)

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Drawing a focus ring around an NSScrollView? (drawing glitches)

Subject: Drawing a focus ring around an NSScrollView? (drawing glitches)
From: Jim Correia <email@hidden>
Date: Fri, 26 May 2006 10:19:47 -0400

I have a subclass of NSScrollView which I'd like to draw a keyboard focus ring around when the documentView is first responder. (Just like the NSTableView/NSScrollView combo.)

What I have works, but as soon as the instance of MyScrollView moves in the window (say due to a live resize) their are trailing focus ring splotches left on the window in the view's previous location.

I've tried overriding -setFrame: and friends to invalidate the focus ring (via -setKeyboardFocusRingNeedsDisplayInRect:) but that doesn't correct the problems?

Any ideas how the NSTableView/NSScrollView combination works? What do I need to do to fix the problem? (I only need to target 10.4 and later.)

Thanks,
Jim
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