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nuke

Python callbacks

Hi there-

I upgraded to 5.2 the other day and i've been looking at the new python panel things most of the stuff I can seem to get my head around but I'm having problems with callbacks or more specifically getting a call back when nuke.frame() is updated.

I've a couple of questions, is there a knob equivalent to nuke.frame() that I could access so whenever the frame number is changed a method is called?

According to the documentation I could use this:

def knobChanged(self, knob):
if knob == nuke.frame():
print("moo")
# do other stuff

But that doesn't appear to work so I began to wonder if I could use the updateUI callback instead so I tried this:

nuke.addUpdateUI(self.updateUI)

def updateUI(self):
print("moo")
# do other stuff

But this doesn't seem to be called when I change frame. Any ideas on how I could do this?

Thanks

Dom