buildWithChild method

@override Widget buildWithChild(BuildContext context, Widget? child)

A build method that receives an extra child parameter.

This method may be called with a child different from the parameter passed to the constructor of SingleChildStatelessWidget. It may also be called again with a different child, without this widget being recreated.

Implementation

@override
Widget buildWithChild(BuildContext context, Widget? child) {
  assert(child != null);
  return duration == null
      ? Expanded(
          flex: flex,
          child: child!,
        )
      : AnimatedExpanded(
          flex: flex,
          duration: duration!,
          curve: curve,
          onEnd: onEnd,
          child: child!,
        );
}