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

note_n52cb06e79d49_1.dart

final controller = ScrollController();
final globalKey = GlobalKey();

ListView.builder(
  controller: controller,
  itemBuilder: (context, index) {
    return SomeWidget(
      key: globalKey,
      child: child,
    );
  },
);

// スクロール処理
final context = globalKey.currentContext;
if (context == null) {
  // globalKeyを設定したWidgetが描画範囲外ならnullになる
  return;
}

final RenderBox renderBox = context.findRenderObject();
final offset = box.localToGlobal(Offset.zero).distance;
controller.animateTo(offset);