You could use kEventWindowActivated to update your application state.
I've just installed that event on the windows (do some stuff and
return eventNotHandledErr) and kEventAppActiveWindowChanged on the
app. Things are coming together.
Presumably you already have some sort of "deferred task queue" to
which you add tasks that need to be handled at the next call
through the event loop. Two easy ways to do that with RAEL:
- install a handler for a custom Carbon event on the application
target. Create a singleton instance of this event. When you add an
entry to the deferred task queue, if the event is not already in
the main event queue, post it to the queue. When you return back to
RAEL, your event will be removed from the queue and dispatched to
your handler, which will execute the deferred tasks.
- even easier may be to just create an event loop timer with a fire
delay and fire interval of zero. The timer will fire on the next
call to the event loop, and can scan the deferred task queue at
that point. However, this doesn't have quite the same semantics as
the first option, and may not be appropriate in all cases, because
it can fire before you actually get back to RAEL. For example, say
the user clicks on a button. You add an entry to the task queue and
install a timer, and then let the button tracking proceed. The
timer will fire while the button is tracking, since the Control
Manager calls the event loop. Using the Carbon event approach, the
custom Carbon event would not be dispatched until after button
tracking finishes and you return back to RAEL.
That was also my fear, should something happen to force an event loop
to run before it *really* gets back to the main loop, like if a
dialog comes up after a drag for some reason (it shouldn't, but
things like this could be a possibility in any of our apps). For
those reasons, using a custom Carbon event sounds like the way to go.
Thanks!
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