[Tutor] how to temporarily disable a function

[Peter Otten]

Pete O'Connell wrote:

> Hi I was wondering if there is a way to disable a function.
> Hi have a GUI grid snapping function that I use in a program called Nuke
> (the film compositing software)
> 
> Here is the function (which loads when Nuke loads):
> #######################
> def theAutoplaceSnap():
>     try:
>         nuke.thisNode().autoplace()
>         n = nuke.allNodes();
>         for i in n:
>           nuke.autoplaceSnap(i)
>     except:
>         pass
> 
> nuke.addOnUserCreate(theAutoplaceSnap)
> ###################################
> 
> I have many functions which get loaded, but this particular one needs to
> be disabled when I am viewing another compositors script in the gui.
> 
> I have a python script editor in Nuke in which I can run code if need be
> to run code on the fly.

http://docs.thefoundry.co.uk/nuke/63/pythondevguide/callbacks.html#onusercreate

suggests that you can remove the callback with

nuke.removeOnUserCreate(theAutoplaceSnap)

You can later add it back with

nuke.addOnUserCreate(theAutoplaceSnap)

like in the code snippet you provided. If the add/removeOnUserCreate() calls 
occur in another module than the one theAutplaceSnap() is defined in you 
need to import that first and use qualified names (e. g. 
some_module.theAutoplaceSnap).