On Thu, Feb 25, 2010 at 3:00 AM, Billy Flatman <b.flat...@googlemail.com> wrote:
>>>> Hi all,
>>>>
>>>> I've written a custom view and done some optimisation of the drawing calls 
>>>> so only the exact areas that need redrawing are passed to the 
>>>> 'setNeedsDisplayInRect' function.
>>>>
>>>> All was working well, until I embedded my view into an NSScroller.
>>>>
>>>> Since then my custom view seems to be being invalidated by grid sections.
>>>>
>>>> I've included a link to some pics to try and better show.
>>>>
>>>> http://www.flickr.com/photos/47616...@n08/sets/72157623505127258/
>>>>
>>>> I added the green borders around the dirtyRect area to better show the 
>>>> problem.

Is your view layer-backed, either directly or by being a subview of
one which is explicitly layer-backed? If so, then it will
automatically become backed by a CATiledLayer once it's embedded in a
scroll view, which would cause exactly the sort of thing you're
seeing.

Mike
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