virtual void film_changed (Film::Property) {}
/** Called when a given property of one of the selected Contents changes */
virtual void film_content_changed (int) = 0;
/** Called when the list of selected Contents changes */
virtual void content_selection_changed () = 0;
virtual void film_changed (Film::Property) {}
/** Called when a given property of one of the selected Contents changes */
virtual void film_content_changed (int) = 0;
/** Called when the list of selected Contents changes */
virtual void content_selection_changed () = 0;