AnimatedSwitcherLayoutBuilder typedef

Widget AnimatedSwitcherLayoutBuilder (Widget currentChild, List<Widget> previousChildren)

Signature for builders used to generate custom layouts for AnimatedSwitcher.

The builder should return a widget which contains the given children, laid out as desired. It must not return null. The builder should be able to handle an empty list of previousChildren, or a null currentChild.

The previousChildren list is an unmodifiable list, sorted with the oldest at the beginning and the newest at the end. It does not include the currentChild.