Our framework handles all of the common events (activate, update,
mouseDown, etc). Handling the activate event sets instance
variables on the app object, like the current document.
You could use kEventWindowActivated to update your application state.
Our main event loop also handles deferred tasks after every event.
These deferred tasks are deleting trashed objects, executing Apple
Events that were created as the result of a drag, etc. This seems
like it will be my biggest hurdle.
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.
-eric
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