The current code/api just returns a GtkWidget to embed ; it would be nice to have something like the roster view, that is a real new widget, with a signal similar to the roster view's :
  void (*presentity_selected) (RosterViewGtk* self,
			       gpointer presentity);
(which would be more like :
  void (*contact_selected) (CallHistoryViewGtk* self,
			    gpointer contact);
)

The signal would be emitted in two situations :
(1) the user selects a contact, and the pointer gives a pointer to the contact ;
(2) the user clears the history, and the pointer is NULL.