animateToPage method
Implementation
animateToPage(int page, {Duration? duration, Curve? curve}) {
final index = Helpers.getRealIndex(
pageController!.page!.toInt(), realPage, items.length)
.toInt();
return pageController!.animateToPage(
pageController!.page!.toInt() + page - index,
duration: duration!,
curve: curve!);
}