signal callback delegate or function to connect
void callback(gobject.signal_group.SignalGroup signalGroup)
signalGroup the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to Unbind signal.
This signal is emitted when the target instance of self is set to a new #GObject.
This signal will only be emitted if the previous target of self is non-null.