(코딩쉐프) 조금 매운 맛 3강 ~ 5강 (로그인과 주사위앱)

 

1. main.dart에서 우리가 눈여겨 볼 것은 총 3가지이다.

  가. 페이지이동

 

  나. Textfield 컨트롤

다. 스낵바 사용하기

 - 영상강좌에서는 SnackBar를 사용하기 위해 build위젯으로 감싸서 context를 만들어주는 부분이 있다 하지만 개선된 버전에서는 build위젯으로 감싸서 context를 만들어주는 부분이 필요없다.

빌더위젯으로 감싸지 않고 바로 처리

스낵바 구현 부분

 

 

main.dart

import 'package:flutter/material.dart';
import 'dice.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Dice game',
      home: LogIn(),
    );
  }
}

class LogIn extends StatefulWidget {
  const LogIn({Key? key}) : super(key: key);

  @override
  State<LogIn> createState() => _LogInState();
}

class _LogInState extends State<LogIn> {
  TextEditingController controller = TextEditingController();
  TextEditingController controller2 = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Log in'),
          backgroundColor: Colors.redAccent,
          centerTitle: true,
          leading: IconButton(
            icon: Icon(Icons.menu),
            onPressed: () {},
          ),
          actions: [IconButton(onPressed: () {}, icon: Icon(Icons.menu))],
        ),
        body: GestureDetector(
          onTap: (){
            FocusScope.of(context).unfocus(); //키보드 없애기
          },
          child: SingleChildScrollView(
                //스크롤 뷰로 구성
                child: Column(
                  children: [
                    Padding(padding: EdgeInsets.only(top: 50)),
                    Center(
                        child: Image(
                      image: AssetImage('image/chef.gif'),
                      width: 170.0,
                      height: 190.0,
                    )),
                    Form(
                        child: Theme(
                            data: ThemeData(
                                primaryColor: Colors.teal,
                                inputDecorationTheme: InputDecorationTheme(
                                    labelStyle: TextStyle(
                                        color: Colors.teal, fontSize: 15.0))),
                            child: Container(
                              padding: EdgeInsets.all(40.0),
                              child: Column(
                                children: [
                                  TextField(
                                    autofocus: true,
                                    controller: controller,
                                    decoration: InputDecoration(
                                        labelText: 'Enter "dice"'),
                                    keyboardType: TextInputType.emailAddress,
                                  ),
                                  TextField(
                                    controller: controller2,
                                    decoration: InputDecoration(
                                        labelText: 'Enter Password'),
                                    keyboardType: TextInputType.text,
                                    obscureText: true,
                                  ),
                                  SizedBox(
                                    height: 40,
                                  ),
                                  ButtonTheme(
                                      minWidth: 100,
                                      height: 50,
                                      child: ElevatedButton(
                                          style: ElevatedButton.styleFrom(
                                              backgroundColor:
                                                  Colors.orangeAccent),
                                          onPressed: () {
                                            if (controller.text == 'dice' &&
                                                controller2.text == '1234') {
                                              Navigator.push(
                                                  context,
                                                  MaterialPageRoute(
                                                      builder: (BuildContext
                                                              context) =>
                                                          Dice())); //순한맛22번강좌
                                            } else if (controller.text !=
                                                    'dice' &&
                                                controller2.text == '1234') {
                                              showSnackBar2(context);
                                            } else if (controller.text ==
                                                    'dice' &&
                                                controller2.text != '1234') {
                                              showSnackBar3(context);
                                            } else {
                                              showSnackBar(context);
                                            }
                                          },
                                          child: Icon(Icons.arrow_forward,
                                              color: Colors.white, size: 35.0)))
                                ],
                              ),
                            )))
                  ],
                ),
              ),
        )
        );
  }
}

void showSnackBar(BuildContext context) {
  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
    content: Text(
      '로그인 정보를 다시 확인하세요.',
      textAlign: TextAlign.center,
    ),
    duration: Duration(seconds: 2),
    backgroundColor: Colors.blue,
  ));
}

void showSnackBar2(BuildContext context) {
  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
    content: Text(
      '비밀번호가 일치하지 않습니다.',
      textAlign: TextAlign.center,
    ),
    duration: Duration(seconds: 2),
    backgroundColor: Colors.blue,
  ));
}

void showSnackBar3(BuildContext context) {
  ScaffoldMessenger.of(context).showSnackBar(SnackBar(
    content: Text(
      'dice의 철자를 확인하세요.',
      textAlign: TextAlign.center,
    ),
    duration: Duration(seconds: 2),
    backgroundColor: Colors.blue,
  ));
}

dice.dart

- fluttertoast사용

import 'package:flutter/material.dart';
import 'dart:math';
import 'package:fluttertoast/fluttertoast.dart';

class Dice extends StatefulWidget {
  const Dice({Key? key}) : super(key: key);

  @override
  State<Dice> createState() => _DiceState();
}

class _DiceState extends State<Dice> {
  int leftDice = 1;
  int rightDice = 2;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.redAccent,
      appBar: AppBar(
        backgroundColor: Colors.redAccent,
        title: Text('Dice Game'),
      ),
      body: Center(
        //center위젯 안에서 Column이나 Row를 사용할 때
        //중앙 정렬하려면 MainAxisAlignment.center사용
        //순한맛강좌 21강
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: const EdgeInsets.all(32),
              child: Row(
                children: [
                  //Expanded위젯은 컬럼이면 세로로 로우면 가로로 꽉 채움
                  Expanded(child: Image.asset('image/dice$leftDice.png')),
                  SizedBox(
                    width: 20,
                  ),
                  Expanded(child: Image.asset('image/dice$rightDice.png')),
                ],
              ),
            ),
            SizedBox(
              height: 60,
            ),
            ButtonTheme(
              child: ElevatedButton.icon(
                style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.orangeAccent,
                    minimumSize: Size(100, 60)),
                onPressed: () {
                  setState(() {
                    leftDice = Random().nextInt(6)+1;
                    rightDice = Random().nextInt(6)+1;
                  });
                  showToast("Left dice: {$leftDice}, Right dice: {$rightDice}");
                },
                icon: Icon(Icons.play_arrow),
                label: Text("Next"),
              ),
            )
          ],
        ),
      ),
    );
  }
}

void showToast(String message){
  Fluttertoast.showToast(msg:message,
    backgroundColor: Colors.white,
    toastLength: Toast.LENGTH_SHORT,
    gravity: ToastGravity.BOTTOM,
  );
}