import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Rein Demo'),
    );
  }
}

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

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

class _MyHomePageState extends State<MyHomePage> {
  int currentStep = 0;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Stepper(
          steps: [
            Step(
              title: const Text('テスト'),
              subtitle: const Text('説明'),
              content: Container(),
              isActive: currentStep == 0,
            ),
            Step(
              title: const Text('回答'),
              content: const Text('これはテストの内容です'),
              isActive: currentStep == 1,
            ),
            Step(
              title: const Text('評価'),
              content: const Text('あなた100点です'),
              isActive: currentStep == 2,
            ),
          ],
          onStepTapped: (index) {
            setState(() {
              currentStep = index;
            });
          },
          currentStep: currentStep,
          onStepCancel: () {
            setState(() {
              currentStep -= 1;
              if (currentStep < 0) {
                currentStep = 0;
              }
            });
          },
          onStepContinue: () {
            setState(() {
              currentStep += 1;
              if (currentStep > 2) {
                currentStep = 2;
              }
            });
          },
        ),
      ),
    );
  }
}