AnimationController: Can we pass the TickerProvider vsync to an other class?

Question

I develop an application in Flutter with a lot of animations quite varied. I would like to structure my code by separating views, logic (model BLoC) and ANIMATIONS. For this problem I try to declare several times the same animation for buttons in a different class of my StatefulWidget.

However, I am stuck because I have to pass a TickerProvider to my animation class, and I do not do it the right way.

Constructor animation class

AppBloc(TickerProvider tickerProvider) {
    banimationController = AnimationController(
      vsync: tickerProvider,
      duration: Duration(milliseconds: 100),
      lowerBound: 0,
      upperBound: 0.05,
    );
}

Declaration

AppBloc(this);

I know this is probably not the right way, I wrote this code to illustrate my problem.

I just want to separate my animations declarations in an other file.

Answer 1

TickerProvider is a mixin. You can use multiple mixins in a class using with keyword. The best way to use the mixin uff TickerProvider is using it with with keyword.

Example :

  class _HomeState extends State<Home> with TickerProviderStateMixin {
  Animation<double> _animation;
  AnimationController _animationController;

  GoogleSignIn _googleSignIn;
  GoogleSignInAccount _googleSignInAccount;
  GoogleSignInAuthentication _googleSignInAuthentication;
  FirebaseAuth _auth;

 // FacebookLoginResult _facebookLoginResult;
  // FacebookLogin _facebookLogin;
   // FirebaseUser facebookUser;

  @override
  void initState() {
    super.initState();
    _animationController =
        AnimationController(vsync: this, duration: Duration(seconds: 4));
    _animation = Tween<double>(begin: -1.0, end: 0.0).animate(CurvedAnimation(
        parent: _animationController, curve: Curves.fastOutSlowIn));

    _animationController.forward();
  }

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }

 @override
  Widget build(BuildContext context) {
return widget();
}
}

If you use the TickelProvider in this way then you can simply pass this as the value for the vsync.