main90.dart

// tween animation
// mean between animation

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.yellow),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});
  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> with SingleTickerProviderStateMixin {
  late Animation animation;
  late AnimationController animationController;
  late Animation colorAnimation;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();

    animationController = AnimationController(vsync: this, duration: Duration(seconds: 4));
    animation = Tween(begin: 0.0, end: 200.0).animate(animationController);
    colorAnimation = ColorTween(begin: Colors.blue, end: Colors.orange).animate(animationController);
    
    animationController.addListener(() { 
      // print(animation.value);
      setState(() {

      });
    });

    animationController.forward();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body:Center(
        child: Container(
       width: animation.value,
          height: animation.value,
          color: colorAnimation.value,
        ),
      )
    );
  }
}