I have a custom view which may have animation. I use an NSTimer to
fire periodically and I check to see if anything is animating in my
view. If so, I call setNeedsDisplay:YES.
If I minimize or hide the application, I notice that drawRect: stops
being called by the system (which I consider good). But if my
view/window is completely obscured by another window (say another
window from my app or from another application such as Safari) , I
noticed that drawRect: is still being called.
Is there a way I can avoid sucking up system resources (by drawing)
when the view is not visible in this manner? (I intend to have lots of
instances of these views in my app, and don't want to overwhelm system
resources by drawing views that may have been buried by other
windows.)
Thanks,
Eric
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