Jeff, I was wondering, are you attempting to sync the drawing with the music, or is this a performance issue you’re seeing?
Doug Hill > On Feb 4, 2016, at 3:52 PM, Jeff Evans <jev...@ars-nova.com> wrote: > > Clark, it's a music app; a piece is composed and placed on the screen; > there's a lot of massaging going on as the music adjusts visually. I want the > play of the example to begin once there are no more updates remaining. That > is no noticeable delay in terms of human time, but makes a difference in the > appearance. > > So I figure: the system presumably knows if it is about to send more redraw > requests to that view. Is there any way I could know what it knows? > > Jeff > > > On Feb 4, 2016, at 3:31 PM, Clark S. Cox III wrote: > > >> On Feb 4, 2016, at 15:07, Jeff Evans <jev...@ars-nova.com> wrote: >> >> Suppose one wants to do a task in an NSView only once it has no drawRect >> calls pending. Is there any way to tell, for a particular NSView, if there >> are any drawing events coming up? Whether, that is, the view is up to date? >> >> I've tried counting my explicit uses of setNeedsDisplay and decrementing >> that count at drawRect, but the trouble is that one can call setNeedsDisplay >> many times and that will not translate into the same number of drawRects. >> >> One idea was to call getRectsBeingDrawn at drawRect and hope that the number >> of rects is equal to the number of update requests combined into that call. >> But the number of rects does not appear to equal the number of draw requests. > > Multiple invalid regions can be merged. > >> But there must be some place that contains a queue of upcoming draw >> requests. If so, is there access to it? > > There really isn't any such queue. There are only areas of the view that are > marked as invalid. > >> I'm hoping this is a dumb question. >> >> Thanks, Jeff > > I hate to be "that guy", but what are you actually trying to do? > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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 arch...@mail-archive.com
