TypeInterface

getStruct void* getStruct(): the main Gtk struct as a void*
getTypeInterfaceStruct GTypeInterface* getTypeInterfaceStruct(bool transferOwnership): Get the main Gtk struct
peekParent TypeInterface peekParent(): Returns the corresponding gobject.TypeInterface structure of the parent type of the instance type to which g_iface belongs. This is useful when deriving the implementation of an interface from the parent type and then possibly overriding some methods.

addPrerequisite void addPrerequisite(GType interfaceType, GType prerequisiteType): Adds prerequisite_type to the list of prerequisites of interface_type. This means that any type implementing interface_type must also implement prerequisite_type. Prerequisites can be thought of as an alternative to interface derivation (which GType doesn't support). An interface can have at most one instantiatable prerequisite type.
getPlugin TypePluginIF getPlugin(GType instanceType, GType interfaceType): Returns the GTypePlugin structure for the dynamic interface interface_type which has been added to instance_type, or NULL if interface_type has not been added to instance_type or does not have a GTypePlugin structure. See g_type_add_interface_dynamic().
peek TypeInterface peek(TypeClass instanceClass, GType ifaceType): Returns the gobject.TypeInterface structure of an interface to which the passed in class conforms.
prerequisites GType[] prerequisites(GType interfaceType): Returns the prerequisites of an interfaces type.