Multiple Flare Animations - Flutter

main.dart

import 'package:flutter/material.dart';
import 'package:flare/flare_actor.dart';

const String ANIM_JUST_NIGHT = "just_night";
const String ANIM_NIGHT_TO_DAY = "night_to_day";
const String ANIM_DAY_TO_NIGHT = "day_to_night";

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blueGrey,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String currentAnimation = ANIM_JUST_NIGHT;
  bool isAnimating = false;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        mainAxisAlignment: MainAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          SizedBox(
              height: 266,
              child: FlareActor(
                "assets/xmas.flr",
                alignment: Alignment.center,
                fit: BoxFit.fill,
                animation: currentAnimation,
                callback: (string) {
                  isAnimating = false;
                  debugPrint(string);
                },
              )),
          Expanded(
            child: Center(
                child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                RaisedButton(
                    color: Colors.blueAccent,
                    child: Text(
                      "Make it daytime",
                      style: TextStyle(color: Colors.white, fontSize: 20),
                    ),
                    onPressed: () {
                      _animateTo(ANIM_NIGHT_TO_DAY);
                    }),
                RaisedButton(
                    color: Colors.black,
                    child: Text(
                      "Yawn, night please",
                      style: TextStyle(color: Colors.white, fontSize: 20),
                    ),
                    onPressed: () {
                      _animateTo(ANIM_DAY_TO_NIGHT);
                    }),
              ],
            )),
          )
        ],
      ),
    );
  }

  void _animateTo(String anim) {
    if (_canAnimateTo(anim)) {
      isAnimating = true;
      setState(() {
        currentAnimation = anim;
      });
    }
  }

  bool _canAnimateTo(String anim) {
    if (currentAnimation == ANIM_JUST_NIGHT) {
      return anim == ANIM_NIGHT_TO_DAY;
    }
    return (!isAnimating && currentAnimation != anim);
  }
}