Re: NSCell mouse tracking best practices.

FROM : mmalc crawford
DATE : Wed Jul 05 22:40:16 2006

On Jul 5, 2006, at 1:17 PM, Óscar Morales Vivó wrote:

> - Keep around an instance variable for the tracking rectangle. Fill 
> it up in trackMouse:inRect:ofView:untilMouseUp: right before calling 
> super, and then override startTrackingAt:inView:, 
> continueTracking:at:inView and stopTracking:at:inView:mouseIsUp: 
> (NSSliderCell seems to do this).
> - Just override the whole trackMouse:inRect:ofView:untilMouseUp: 
> taking care of the event loop there and ignoring the other three 
> mouse tracking methods (That's what the clock control sample code 
> does).
>

Personally I would avoid the latter since it makes it more difficult 
to alter behaviour in a subclass -- depending on what you do, it may 
also interfere with support for bindings.

I've put an updated, bindings-enabled, version of ClockControl at:
   <http://homepage.mac.com/mmalc/CocoaExamples/ClockControl2a.zip>

Note that it (still) represents a work in progress.  Bug reports are 
welcome.

mmalc