import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(useMaterial3: false),
      title: 'Flutter Demo',
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title, style: TextStyle(fontFamily: 'ProductSans')),
      ),
      body: Center(
        child: Column(
          children: [
            Text(
              'Button tapped $_counter time${_counter == 1 ? '' : 's'}.',
              key: Key('CountText'),
            ),
            FilledButton(onPressed: onPressed, child: Text('New Page')),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }

  void onPressed() async {
    await Navigator.push(
      context,
      MaterialPageRoute(builder: (context) => NewPage()),
    );
  }
}

class NewPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('New Page')),
      body: Center(child: Text('This is a new page.')),
    );
  }
}