Конец урока

src/App.jsx

@@ -1,112 +1,67 @@
-import React from 'react'
+import React, { useState, useReducer, useRef, memo } from 'react'
 
-class ErrorBoundary extends React.Component {
+function tasksReducer(state, action) {
-    constructor(props) {
+    switch(action.type) {
-        super(props);
+        case 'ADD_TASK':
-        this.state = {hasError: false};
+            return [...state, action.payload]
+        case 'TOGGLE_TASK':
+            return state.map(task => task.id === action.payload ? {...task, complite: !task.complite} : task)
+        case 'REMOVE_TASK':
+            return state.filter(task => task.id !== action.payload)
+        default:
+            return state
+    }
 }
 
-    static getDerivedStateFromError(error) {
+const TaskList = memo(function TaskList({tasks, onToggle, onRemove}) {
-        return { hasError: true }
+    console.log("Rendred")
-    }
-    
-    componentDidCatch(error,info) {
-        console.log(error,info);
-    }
-    
-    handlerReset = () => {
-        this.setState({hasError: false});
-    }
-    
-    render() {
-        if (this.state.hasError) {
     return (
-                <div>
+        <ul>
-                    <h1>Что то поломалось</h1>
+        {tasks.map(({id, text, complite}) => (
-                    <button onClick={this.handlerReset}>Повторить</button>
+                <li key={id}
-                </div>)
+                    style={{textDecoration: complite ? 'line-through' : 'none' }}>
-        }
+                    <input type="checkbox" checked={complite} onChange={()=>onToggle(id)} />
-        return this.props.children;
+                    {text}
-    }
+                    <button onClick={()=> onRemove(id)} style={{marginLeft: 10}}>
-}
+                        Удалить
-
+                    </button>
-class AdvancedErrorBoundary extends React.Component {
+                </li>
-    constructor(props) {
+            ))}
-        super(props);
+        </ul>
-        this.state = {
+    )
-            hasError: false,
-            error: null,
-            errorInfo: null
-        }
-    }
-    
-    static getDerivedStateFromError(error) {
-        return { hasErorr: true }
-    }
-    
-    componentDidCatch(error, info) {
-        this.setState({ 
-            error: error,
-            errorInfo: info
 })
-    }
-    
-    handleReset = () => {
-        this.setState({
-            hasError:false,
-            error: null,
-            errorInfo:null
-        });
-    }
-    
-    render() {
-        if(this.state.hasError) {
-            console.log('Error');
-            return (
-                <div>
-                    <h2>Произошла ошибка</h2>
-                    <p>Извеняемся, работаем, исправляем. Разработчика привязали к батарее</p>
-                    <button onClick={this.handleReset}>Попробовать снова</button>
-                </div>
-            )
-        }
-        //Если ошибок нет, то рендрим дочерние объекты
-        return this.props.children
-    }
-}
-
-function ProblemComponent() {
-    const [counter,setCounter] = React.useState(0)
-    
-    const handlerClick = () => setCounter(counter + 1)
-    
-    React.useEffect(() => {
-        if (counter > 5) {
-            throw new Error("Ошибка в компоненте");
-        }
-    },[counter]);
-    return (
-        <div>
-            <h2>Счетчик: {counter}</h2>
-            <button onClick={handlerClick}>Прибавить</button>
-        </div>
-    )
-}
 
 function App() {
+    const [tasks, dispatch] = useReducer(tasksReducer,[])
+    const [input,setInput] = useState('')
+    const [error,setError] = useState('')
+    const inputRef = useRef(null)
+    
+    const addTask = () => {
+        if (input.trim() === '') {
+            setError('Пустой текст задачи')
+            return
+        }
+        setError('')
+        dispatch({
+            type: 'ADD_TASK',
+            payload: {id: Date.now(), text: input.trim(), complite: false }
+        })
+        setInput('')
+        inputRef.current.focus()
+    }
+    
 	return (
-		<>
+		<div style={{padding: 20}}>
-			<h1>Обработка ошибок в компонентах</h1>
+			<h1>Список дел</h1>
-            <ErrorBoundary>
+			<input ref={inputRef} value={input} onChange={e => setInput(e.target.value)} />
-                <ProblemComponent />
+			<button onClick={addTask}>Добавить</button>
-            </ErrorBoundary>
+            {error && <p style={{color: 'red'}}>{error}</p>}
-            <ErrorBoundary>
+            
-                <ProblemComponent />
+            <TaskList tasks={tasks} 
-            </ErrorBoundary>
+                onToggle={id => dispatch({type: 'TOGGLE_TASK', payload: id})}
-            <ErrorBoundary>
+                onRemove={id => dispatch({type: 'REMOVE_TASK', payload: id})} />
-                <ProblemComponent />
+		</div>
-            </ErrorBoundary>
-		</>
 	)
 }