[Openmcl-devel] Core Animation demo

Raffael Cavallaro raffaelcavallaro at mac.com
Wed Jul 8 05:13:09 UTC 2009


On Jul 8, 2009, at 12:39 AM, Gary Byers wrote:

> OBJC:MAKE-OBJC-INSTANCE (or that there newfangled CL:MAKE-INSTANCE  
> thing,
> which is entirely equivalent) is basically
>
> (#/init (#/alloc class)) ; allocate an instance of class, call #/ 
> init to initialize
>                          ; that instance.
>
> Calling #/init on the value returned by either MAKE-INSTANCE or  
> OBJC:MAKE-OBJC-INSTANCE
> is therefore equivalent to
>
> (#/init (#/init (#/alloc class)))
>
> If an #/init method has side effects (like ... oh, attaching a layer  
> to a context,
> whatever that means), and can tell when those side effects have  
> already taken
> place, it'd certainly be justified in warning about that.

Right, but it only warns on the second redundant #/init calland  
subsequently. The first time #/init is called on the result of  
objc:make-objc-instance there's no error logged to console.

In reply to Neil, If I remove the (redundant) #/init call, I see what  
you see - If I leave the first window open it becomes unresponsive to  
mouse clicks. I'm pretty sure this is because your "sprite" is a  
dynamic variable. You probably want to do something like the attached  
which gives each new window its own sprite rather than using a single  
sprite defined with defparameter. I had forgotten I refactored your  
code this way earlier today when I mentioned this issue just now.

warmest regards,

Ralph


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Raffael Cavallaro
raffaelcavallaro at me.com







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