> On 5 Feb 2016, at 10:52 AM, 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?
Personally, I think you are abusing the view here - it should obediently
display what it’s told, not be part of your underlying logic.
However, there’s an easy-ish way to do what you want, if a little hacky.
- (void) drawRect:(NSRect) dirty
{
[NSObject cancelPreviousPerformRequestsWithTarget:self
selector:@selector(doStuffWhenIdle) object:nil];
/* do whatever you need to draw the view */
[self performSelector:@selector(doStuffWhenIdle) withObject:nil
afterDelay:MY_IDLE_TIME];
}
- (void) doStuffWhenIdle
{
// will be called once there are no more -drawRect calls and
MY_IDLE_TIME has elapsed
….
}
—Graham
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