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? -- If this email is spam, report it to https://support.onlymyemail.com/view/report_spam/MTAxOTYyOjE4NDk5MDE2Njc6amV2YW5zQGFycy1ub3ZhLmNvbTpkZWxpdmVyZWQ _______________________________________________ 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
