ReorderItemProxyDecorator typedef Null safety

Widget ReorderItemProxyDecorator (
  1. Widget child,
  2. int index,
  3. Animation<double> animation
)

Signature for the builder callback used to decorate the dragging item in ReorderableList and SliverReorderableList.

The child will be the item that is being dragged, and index is the position of the item in the list.

The animation will be driven forward from 0.0 to 1.0 while the item is being picked up during a drag operation, and reversed from 1.0 to 0.0 when the item is dropped. This can be used to animate properties of the proxy like an elevation or border.

The returned value will typically be the child wrapped in other widgets.

Implementation

typedef ReorderItemProxyDecorator = Widget Function(Widget child, int index, Animation<double> animation);