build method
      
  
Widget
build(
    
- BuildContext context,
 - Widget child,
 - AnimationController controller,
 - EffectEntry entry,
 
override
    Builds the widgets that implement the effect on the target child,
based on the provided AnimationController and EffectEntry.
Implementation
@override
Widget build(
  BuildContext context,
  Widget child,
  AnimationController controller,
  EffectEntry entry,
) {
  return FadeTransition(
    opacity: buildAnimation(controller, entry),
    child: child,
  );
}