> On Feb 24, 2016, at 3:47 PM, Quincey Morris > <[email protected]> wrote: > > On Feb 24, 2016, at 13:44 , Graham Cox <[email protected] > <mailto:[email protected]>> wrote: >> >> However, if you use a clipping path, you can just create this on the fly as >> part of -drawRect: and so it’ll always be correct > > I don’t recall Charles’s drawing code exactly, but I think this is just part > of the solution. It’ll always be correct for the part of the view being > drawn, but there’s no guarantee that the whole view will be redrawn if the > relationship between the bounds origin and the circle changes. I think > Charles still needs something to force redrawing of the whole view when the > view geometry changes.
By default -setNeedsDisplay will dirty the entire view for redraw. -setNeedsDisplayInRect: can be used for partial updates, but typically you will call that directly. If you always draw inside of the whole bounds of the view however, you are generally insulated from origin changes (as either setNeedsDisplay method should do the right thing in these circumstances). > > Of course, if the view geometry never changes, or the relationship of the > circle to the bounds origin never changes, then I think the forced redrawing > isn’t necessary. > -- David Duncan _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
