Flutter Animation : AnimatedSwitcher

import 'dart:math';

import 'package:flutter/material.dart';

class SwitcherAnimation extends StatefulWidget {
  const SwitcherAnimation({Key? key}) : super(key: key);

  @override
  State<SwitcherAnimation> createState() => _SwitcherAnimationState();
}

class _SwitcherAnimationState extends State<SwitcherAnimation> {
  int _size = 200;
  final Random _random = Random();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: Center(
        child: Column(
          children: [
            const SizedBox(height: 50,),

            AnimatedSwitcher(
              duration: const Duration(milliseconds: 800),
              transitionBuilder: (child, animation) {
                return ScaleTransition(scale: animation,child: child,);
              },
              child: Image.asset(
                key: ValueKey(_size),
                'assets/user1.jpg',
                width: 200,
                height: 200,
              ),
            ),

            const SizedBox(height: 8,),

             ElevatedButton(
              onPressed: () {
                setState(() {
                  _size = _random.nextInt(300);                 
                });
                
              }, 
              child: const Text('Click Me!'),
            )

          ],
        ),
      ),
    );
  }
}