AnimatedReorderableState<T extends AnimatedReorderable> class abstract

The AnimatedReorderableState for AnimatedReorderable, a wrapper for list or grid that animates items when they are inserted, removed or reordered.

When an item is inserted with insertItem an animation begins running. The animation is passed to the insertItem builder parameter.

When an item is removed with removeItem its animation is reversed. The removed item's animation is passed to the removeItem builder parameter.

When an item is reordered with reorderItem its motion animation is handled by the underlying controller.

An app that needs to insert, remove or reorder items in response to an event can refer to the AnimatedReorderable's state with a global key:

// (e.g. in a stateful widget)
GlobalKey<AnimatedReorderableState> animatedReorderableKey = GlobalKey<AnimatedReorderableState>();

// ...

@override
Widget build(BuildContext context) {
  return AnimatedReorderable(
    key: animatedReorderableKey,
    keyGetter: (index) => ValueKey(_items[index]),
    listView: ListView.builder(
    //  ...
    ),
  );
}

// ...

void _updateList() {
  _items.insert(123, newItem);
  animatedReorderableKey.currentState!.insertItem(123, builder:  (context, index, animation) {
  //  ...
  });
}

AnimatedReorderable item input handlers can also refer to their AnimatedReorderableState with the static AnimatedReorderable.of method.