of static method
Inherit the SheetController from the closest SlidingSheet.
Every SlidingSheet has a SheetController, even if you didn't assign one explicitly. This allows you to call functions on the controller from child widgets without having to pass a SheetController around.
Implementation
static SheetController? of(BuildContext context) {
return context.findAncestorStateOfType<_SlidingSheetState>()?.sheetController;
}