Q We are writing a screen saver that plays QuickTime movies. Our
WaitNextEvent loop and code is very basic. We have noticed that other
background applications don't get any time, even if we use WaitNextEvent and make sure
MoviesTask does not spend too much time playing the movie. However, if we add code to
track the updateEvents with BeginUpdate and EndUpdate the
problem is gone. Why?
A QuickTime and other parts are sending update events to your application.
If these update events are not handled, they are resent, resulting in no time
yield to other applications.
By calling BeginUpdate/EndUpdate or otherwise taking care of the
update event inside your WaitNextEventLoop, you allow yielding to
other applications.
See Technote TB 37
Pending Update Perils, which discusses this situation
[Sep 15 1995]
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