On Mar 13, 2010, at 10:23 PM, Quincey Morris wrote: > 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.
You should also see if -beginModalSessionForWindow:/-runModalSession:/-endModalSession: makes sense for your situation. It does require that you can do the time-consuming task in discrete chunks. Regards, Ken _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
