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',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true, // This doesn't matter.
      ),
      home: Builder(
        builder: (context) => Scaffold(
          appBar: AppBar(
            backgroundColor: Theme.of(context).colorScheme.inversePrimary,
            title: const Text('Flutter Demo Home Page'),
          ),
          body: RefreshIndicator(
            onRefresh: () => Future.delayed(const Duration(seconds: 3), () {}),
            color: Colors.blue.withOpacity(0.5),
            child: ListView(
              physics: const AlwaysScrollableScrollPhysics(),
              children: [
                Text(
                  'Pull to display to indicator.',
                  style: Theme.of(context).textTheme.headlineMedium,
                  textAlign: TextAlign.center,
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}