On Mar 13, 2010, at 19:33, Alexander Bokovikov wrote:
> I have a time-consuming procedure, and I'd like to show its progress. I can't
> use multi-threading for some technical reason.
> I'm looking for a way to update a progress indicator from this procedure,
> As far as I understand my task is to cause message loop processing.
> And my question is - how to do it?
It's fairly straightforward -- repeatedly invoke a method that does the
following:
NSEvent *event;
while ((event = [NSApp nextEventMatchingMask: NSAnyEventMask
untilDate: nil inMode:
NSEventTrackingRunLoopMode dequeue: YES]))
[NSApp sendEvent: event];
Make sure this is called often enough for responsiveness (say, at least every
0.1 secs), but not too often to interfere with performance.
You might want to choose a different run loop mode, if you have special
requirements. NSEventTrackingRunLoopMode is sufficient to allow keystrokes and
mouse clicks to be processed, so that you can have a UI (say, Esc key or
button) to cancel the procedure if you want.
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