createController method
Creates a FLineCalendarScrollController.
Overriding managed subclasses should always return controller if it is non-null, e.g. return controller ?? MyController();
Implementation
@override
FLineCalendarScrollController createController() =>
controller ??
FLineCalendarScrollController(
start: start,
end: end,
today: today,
initialDate: initialDate,
initialAlignment: initialAlignment ?? .center,
);