activate (
  GSimpleAction* self,
  GVariant* parameter,
  gpointer user_data


Indicates that the action was just activated.

parameter will always be of the expected type, i.e. the parameter type specified when the action was created. If an incorrect type is given when activating the action, this signal is not emitted.

Since GLib 2.40, if no handler is connected to this signal then the default behaviour for boolean-stated actions with a NULL parameter type is to toggle them via the GSimpleAction::change-state signal. For stateful actions where the state type is equal to the parameter type, the default is to forward them directly to GSimpleAction::change-state. This should allow almost all users of GSimpleAction to connect only one handler or the other.

Default handler:

The default handler is called after the handlers added via g_signal_connect().

Available since:2.28



Type: GVariant

The parameter to the activation, or NULL if it has no parameter.

The argument can be NULL.
The data is owned by the caller of the function.