gboolean ev_window_is_empty (const EvWindow *ev_window);
void ev_window_run_presentation (EvWindow *ev_window);
void ev_window_stop_presentation (EvWindow *ev_window,
gboolean ev_window_is_empty (const EvWindow *ev_window);
void ev_window_run_presentation (EvWindow *ev_window);
void ev_window_stop_presentation (EvWindow *ev_window,