Конец урока

src/App.jsx

@@ -1,59 +1,67 @@
-import React from 'react'
+import React, { useState, useReducer, useRef, memo } from 'react'
 
-class RandomUser extends React.Component {
-    constructor(props) {
-        super(props)
-        this.state = { user: {} }
-    }
-    
-    componentDidMount() {
-        fetch('https://randomuser.me/api')
-        .then(responce => responce.json())
-        .then(json => this.setState({ user: json.results[0] }));
-        console.log('смонтирован')
-    }
-    
-    componentDidUpdate(prevProps,prevState) {
-        console.log(this.state);
-        console.log('Компонент обнвлен')
-    }
-    
-    componentWillUnmount() {
-        console.log('Компонент таймера размонтирован')
-    }
-    
-    render() {
-        return <div>
-            {this.state.user && 
-                this.state.user.name &&
-                (
-                <>
-                    <h2>{this.state.user.name.first} {this.state.user.name.last}</h2>
-                    <img src={this.state.user.picture.medium} />
-                    <button onClick={() => {
-                        console.log('Загружаем ... ')
-                        fetch('https://randomuser.me/api')
-                        .then(responce => responce.json())
-                        .then(json => this.setState({ user: json.results[0] }));
-                    }}>Загрузить нового</button>
-                </>
-                )
-            }
-            </div>
+function tasksReducer(state, action) {
+    switch(action.type) {
+        case 'ADD_TASK':
+            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
     }
 }
 
+const TaskList = memo(function TaskList({tasks, onToggle, onRemove}) {
+    console.log("Rendred")
+    return (
+        <ul>
+        {tasks.map(({id, text, complite}) => (
+                <li key={id}
+                    style={{textDecoration: complite ? 'line-through' : 'none' }}>
+                    <input type="checkbox" checked={complite} onChange={()=>onToggle(id)} />
+                    {text}
+                    <button onClick={()=> onRemove(id)} style={{marginLeft: 10}}>
+                        Удалить
+                    </button>
+                </li>
+            ))}
+        </ul>
+    )
+})
+
 function App() {
-    const [showClock, setShowClock] = React.useState(true);
+    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 (
-		<>
-			<h1>Домашнее задание: жизненый цикл</h1>
-            <button onClick={()=> setShowClock(!showClock)}>
-                {showClock ? 'Скрыть часы' : 'Показать часы' }
-            </button>
-            {showClock && <RandomUser />}
-		</>
+		<div style={{padding: 20}}>
+			<h1>Список дел</h1>
+			<input ref={inputRef} value={input} onChange={e => setInput(e.target.value)} />
+			<button onClick={addTask}>Добавить</button>
+            {error && <p style={{color: 'red'}}>{error}</p>}
+            
+            <TaskList tasks={tasks} 
+                onToggle={id => dispatch({type: 'TOGGLE_TASK', payload: id})}
+                onRemove={id => dispatch({type: 'REMOVE_TASK', payload: id})} />
+		</div>
 	)
 }
 

src/main.jsx

@@ -4,5 +4,7 @@ import { createRoot } from 'react-dom/client'
 import App from './App.jsx'
 
 createRoot(document.getElementById('root')).render(
+	<StrictMode>
 		<App />
+	</StrictMode>
 )