build method

@override Widget build(BuildContext context)

Override this method to build widgets that depend on the state of the listenable (e.g., the current value of the animation).

Implementation

@override
Widget build(BuildContext context) {
  final animation = listenable as Animation<double>;
  return Visibility(
    visible: animation.value != 0,
    child: FadeTransition(
      opacity: animation,
      alwaysIncludeSemantics: alwaysIncludeSemantics,
      child: child,
    ),
  );
}