First, I don't know jack about QC and I'm hoping to keep it that way for
the moment. I'm trying to create a simple Cocoa controller which will
install and play a composition using a QCCompositionLayer focused at a point
where the user clicks the mouse. There is a button in a panel which allows
it to enter this mode. The intent is for the (toggle) button to stay
clicked as long as the composition is playing. The user can terminate by
unclicking it.
What I need some kind of call-back or other way to know if a composition
finishes so it will automatically unclick the button. How do I do that?
(If there is a way to put some kind of notifier at the end of the
composition, I can live with that.)
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