[TIL]221012 - Flutter To-do List 앱 개발(1)

//Todo class
class Todo{
  bool isDone = false;
  String title;
  Todo(this.title);
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'To-do list',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: TodoListPage(),
    );
  }
}

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

  @override
  State<TodoListPage> createState() => _TodoListPageState();
}

class _TodoListPageState extends State<TodoListPage> {
  final _item = <Todo>[]; 

  var _todoController = TextEditingController();
  
  //할 일 추가
  void _addTodo(Todo todo) {
    setState(() {
      _item.add(todo);
      _todoController.text = '';
    });
  }

//할 일 삭제
  void _deleteTodo(Todo todo) {
    setState(() {
      _item.remove(todo);
    });
  }

//할 일 완료
  void _toggleTodo(Todo todo) {
    setState(() {
      todo.isDone = !todo.isDone;
    });
  }

  @override
  void dispose(){
    _todoController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('남은 할 일'),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0), //양방향 동일한 패딩
        child: Column(
          children: [
            Row(
              children: [
                Expanded(child: TextField(
                  controller: _todoController,
                ),
                ),
                ElevatedButton(
                    onPressed: () => _addTodo(Todo(_todoController.text)),
                    child: Text('추가')

                )
              ],
            ),
            Expanded(
              child: ListView(
                children: _item.map((todo) => _buildItemWidget(todo)).toList(),
              ),
            )
          ],
        )
      )
    );
  }

  Widget _buildItemWidget(Todo todo) {
    return ListTile(
      onTap: () => _toggleTodo(todo),
      title: Text(
        todo.title,
        style: todo.isDone? const TextStyle( //삼항연산자, 스타일을 넣거나 안 넣거나 (isDone)
          decoration: TextDecoration.lineThrough,
          fontStyle: FontStyle.italic,
        ):null,
      ),
      trailing: IconButton(
        icon: const Icon(Icons.delete_forever),
        onPressed: () => _deleteTodo(todo),
      ),
    );
  }
}