Subscribe to this signal.
This callback will be run when emit() is called.
Optional
Handlers with a higher order value will be called later.
Unsubscribe from this signal with the original callback instance. While you can use this method, the SignalConnection returned by connect() will not be updated!
The callback you passed to connect().
Disconnect all handlers from this signal event.
Publish this signal event (call all handlers).
Protected
The number of connections on this signal.
true if this signal has connections.
Subscribe to this signal.