import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Web Training',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  TextEditingController nameController;
  String name = "";

  @override
  void initState() {
    super.initState();

    nameController = new TextEditingController();
  }

  @override
  void dispose() {
    nameController.dispose();

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("ログイン画面"),
      ),
      body: Center(
        child: Card(
          child: Container(
            padding: EdgeInsets.all(16.0),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: <Widget>[
                Image.network(
                  "https://www.mediafire.com/convkey/ca97/b9dpcq83fxgbk3o6g.jpg",
                  width: 200,
                ),
                Icon(
                  Icons.favorite,
                  color: Colors.green,
                ),
                Container(
                  width: 200,
                  child: TextField(
                    controller: nameController,
                    onChanged: (text) {
                      setState(() {
                        name = text;
                      });
                    },
                  ),
                ),
                Text(
                  "ようこそ、$nameさん",
                  style: TextStyle(
                    fontSize: 16.0,
                    color: Colors.grey
                  ),
                ),
                FlatButton(
                  onPressed: () {
                    Navigator.of(context).push(
                      MaterialPageRoute(
                        builder: (context) {
                          return SecondPage();
                        },
                      ),
                    );
                  },
                  child: Text("ログイン"),
                )
              ],
            ),
          ),
        ),
      )
    );
  }
}

class SecondPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("ネクストページ"),
      ),
      body: Center(
        child: Text(
          "次のページだよ!",
          style: TextStyle(
            fontSize: 40.0
          ),
        ),
      ),
    );
  }
}