camera moved event (scripting)

 From:  pressure (PEER)
11027.1 
I'd like to have a DistanceInput / NumericInput display the distance between the camera and target as I move the camera using the view controls, mouse, SpaceMouse, etc. Is there an event I can listen for that's fired when the camera moves? Also, what's the difference between DistanceInput and NumericInput?

- Peer