Event for when a node gets shown on screen

[Pedro Duque Vieira]

Hi,

More than once or twice I had the need to do something when a node first
gets shown on screen. Like for instance do some animation or setup some
parameters which are only valid when the node is showing.

For this reason I think there is a need for an event that is triggered when
the node becomes live, i.e. is shown on screen.

Thanks, best regards,

-- 
Pedro Duque Vieira