AnimatedWidget constructor Null safety

const AnimatedWidget(
  1. {Key? key,
  2. required Listenable listenable}
)

Creates a widget that rebuilds when the given listenable changes.

The listenable argument is required.

Implementation

const AnimatedWidget({
  Key? key,
  required this.listenable,
}) : assert(listenable != null),
     super(key: key);