Sets our main struct and passes it to the parent class
the main Gtk struct as a void*
Test whether the given element implements a certain interface of type iface_type, and test whether it is supported for this specific instance.
cast a given object to an interface type, and check whether this interface is supported for this specific instance.
check a given object for an interface implementation, and check whether this interface is supported for this specific instance.
the main Gtk struct
Description Provides interface functionality on per instance basis and not per class basis, which is the case for gobject.