flutter_authentication1

import 'package:flutter/material.dart';

class Authentication extends StatefulWidget {
  @override
  _AuthenticationState createState() => _AuthenticationState();
}

class _AuthenticationState extends State<Authentication> {

  //TODO 3: buat global key
  final formKey = GlobalKey<FormState>();

  String _email;
  String _password;

  void validateAndSave() {
    //TODO 5: buat variabel form dan diberi state dari formKey
    final form = formKey.currentState;
    //TODO 9: simpan form
    form.save();
    //TODO 6: lakukan validasi
    if(form.validate()) {
      //TODO 10: print nilai _email dan _password
      print('Form is valid. Email: $_email, Password: $_password');
    } else {
      print('Form is invalid. Email: $_email, Password: $_password');
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Autentication'),
      ),
      body: Container(
        padding: EdgeInsets.all(16.0),
        child: Form(
          //TODO 4: pasang key
          key: formKey,

          child: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              TextFormField(
                keyboardType: TextInputType.emailAddress,
                decoration: InputDecoration(labelText: 'Email'),
                //TODO 1: validasi email
                validator: (value) => value.isEmpty ? 'Email can\'t be empty' : null,
                //TODO 7: simpan nilai email
                onSaved: (value) => _email = value,
              ),
              TextFormField(
                decoration: InputDecoration(labelText: 'Password'),
                //TODO 2: validasi password
                validator: (value) => value.length < 6 ? 'Minimum 6 characters' : null,
                obscureText: true,
                //TODO 8: simpan nilai password
                onSaved: (value) => _password = value,
              ),
              RaisedButton(
                child: Text('Sign Up'),
                onPressed: validateAndSave,
                color: Colors.deepOrange,
                textColor: Colors.white,
              ),
            ],
          ),
        ),
      ),
    );
  }
}