onEnter 
  fun onEnter(connectFlags: <Error class: unknown class> = ConnectFlags(0u), handler: (<Error class: unknown class>, <Error class: unknown class>) -> Unit): <Error class: unknown class>(source)
Signals that the pointer has entered the widget.
Parameters
connectFlags 
a combination of ConnectFlags
handler
the Callback to connect. Params: x coordinates of pointer location; y coordinates of pointer location