> On 29 Dec 2015, at 23:45, Ken Thomases <k...@codeweavers.com> wrote: > > On Dec 29, 2015, at 5:44 AM, Graham Cox <graham....@bigpond.com> wrote: >> >> On 29 Dec 2015, at 7:44 PM, Roland King <r...@rols.org> wrote: >>> >>> I can subclass NSSlider or possibly NSSliderCell but that sounds like a >>> whole world of pain, if I have to do that I’ll probably just put a >>> coalescing delay into the whole thing which waits 1/2 second after an >>> update before it actually does the update. >>> >>> Any good ways to do this? >> >> In your action method, call another method that handles the final value >> using -performSelector:withObject:afterDelay: but just before you do that, >> call +[NSObject cancelPreviousPerformRequestsWithTarget:...] for the same >> message. This schedules a deferred message but immediately cancels it as >> long as the values come pouring in. On the last time, when you stop moving >> the slider, the final -performSelector will get to its target and do its >> work. The afterDelay parameter can be set to whatever value you think you’ll >> need to allow for a slowly moved slider NOT to fire the final message. I >> typically use 0.1sec. > > This gives false positives if the user simply stops moving the mouse but > doesn't release the mouse button. There's no delay you can specify that > avoids this, since there's no upper bound to how long the user can hold the > mouse button. (With assistive technologies, the user doesn't even have to be > actually holding anything for the duration.)
It shouldn't. performSelector:afterDelay: schedules using NSRunLoopDefaultMode, while the slider uses NSEventTrackingRunLoopMode. So it will never fire while the slider is still tracking. In fact, you could use 0.0 as the delay. Cheers, -- Uli Kusterer "The Witnesses of TeachText are everywhere..." http://stacksmith.org _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
