Конец урока

src/App.jsx

@@ -1,51 +1,67 @@
-import { useState, useReducer } from 'react'
+import React, { useState, useReducer, useRef, memo } from 'react'
 
-function counterReducer(state, action) {
-    switch (action.type) {
-        case 'increment':
-            return state + 1
-        case 'decrement':
-            return state - 1
-        case 'reset':
-            return 0
-        case 'set_value':
-            return action.value
+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
     }
 }
 
-function Counter() {
-    const [count, dispatch] = useReducer(counterReducer,0);
-    
+const TaskList = memo(function TaskList({tasks, onToggle, onRemove}) {
+    console.log("Rendred")
     return (
-        <div>
-            <span>Счетчик: {count}</span>
-            <button onClick={()=> dispatch({type: 'increment'})}>+</button>
-            <button onClick={()=> dispatch({type: 'decrement'})}>-</button>
-            <button onClick={()=> dispatch({type: 'reset'})}>reset</button>
-            <button onClick={()=> dispatch({type: 'set_value', value: 5})}>set 5</button>
-        </div>
+        <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 [tasks, setTasks] = useState([])
-    const [filter, setFilter] = useState('all')
-    const [sortBy,setSortBy] = useState('date')
+    const [tasks, dispatch] = useReducer(tasksReducer,[])
+    const [input,setInput] = useState('')
+    const [error,setError] = useState('')
+    const inputRef = useRef(null)
     
-    const addTask = newTask => {
-        setTasks([...tasks,newTask])
+    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 (
-		<>
-			{/* Добавьте тестовый контент для проверки */}
-			<h1>Hello, React!</h1>
-            <Counter />
-		</>
+		<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/App.module.scss

@@ -1,15 +0,0 @@
-.container {
-/*    display: flex;
-    flex-direction: column;
-    flex-wrap: nowrap;*/
-    height: 500px;
-    overflow: auto;
-    border: 1px solid black;
-}
-.item {
-    font-size: 16pt;
-    border: 1px dotted gray;
-    /*margin: 5px 10px;
-    padding: 10px;*/
-    border-radius: 5px;
-}