Message.state_changed

Description:

[ CCode ( has_construct_function = false ) ]
public Message.state_changed (Object? src, State oldstate, State newstate, State pending)

Create a state change message.

This message is posted whenever an element changed its state.

src	The object originating the message.
oldstate	the previous state
newstate	the new (current) state
pending	the pending (target) state