public interface OverlayController<T>
int
add(OverlayCell cell)
void
destroy()
hideAll()
init(T container)
refresh()
remove(OverlayCell cell)
removeAll()
void refresh()
int add(OverlayCell cell)
int remove(OverlayCell cell)
int removeAll()
void init(T container)
void destroy()
void hideAll()