https://note.com/kitoko552/n/n52cb06e79d49

note_n52cb06e79d49_2.dart

final controller = AutoScrollController();

ListView.builder(
 controller: controller,
 itemCount: _maxItemCount,
 itemBuilder: (context, index) {
   return AutoScrollTag(
     key: ValueKey(index),
     controller: controller,
     index: index,
     child: child,
   );
 },
);

// スクロール処理
controller.scrollToIndex(
 index,
 preferPosition: AutoScrollPosition.begin,
);