+EvTransitionEffect *
+ev_document_transition_get_effect (EvDocumentTransition *document_trans,
+ gint page)
+{
+ EvDocumentTransitionIface *iface = EV_DOCUMENT_TRANSITION_GET_IFACE (document_trans);
+ EvTransitionEffect *effect = NULL;
+
+ if (iface->get_effect)
+ effect = iface->get_effect (document_trans, page);