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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| import { Action } from './types/Action'; | ||
| import { Filter } from './types/Filter'; | ||
| import { State } from './types/State'; | ||
| import React, { useEffect, useReducer } from 'react'; | ||
|
|
||
| const reducer = (state: State, action: Action): State => { | ||
| switch (action.type) { | ||
| case 'addTodo': | ||
| return { | ||
| ...state, | ||
| todos: [...state.todos, action.payload], | ||
| }; | ||
|
|
||
| case 'deleteTodo': | ||
| return { | ||
| ...state, | ||
| todos: state.todos.filter(todo => todo.id !== action.payload), | ||
| }; | ||
|
|
||
| case 'updateTodo': | ||
| return { | ||
| ...state, | ||
| todos: state.todos.map(todo => | ||
| todo.id === action.payload.id ? action.payload : todo, | ||
| ), | ||
| }; | ||
|
|
||
| case 'setFilter': | ||
| return { | ||
| ...state, | ||
| filter: action.payload, | ||
| }; | ||
|
|
||
| default: | ||
| return state; | ||
| } | ||
| }; | ||
|
|
||
| const loadedTodos = localStorage.getItem('todos'); | ||
| const initialState: State = { | ||
| todos: loadedTodos ? JSON.parse(loadedTodos) : [], | ||
| filter: Filter.All, | ||
| }; | ||
|
|
||
| export const StateContext = React.createContext<State>(initialState); | ||
| export const DispatchContext = React.createContext<React.Dispatch<Action>>( | ||
| () => {}, | ||
| ); | ||
|
|
||
| type Props = { | ||
| children: React.ReactNode; | ||
| }; | ||
|
|
||
| export const GlobalProvider: React.FC<Props> = ({ children }) => { | ||
| const [state, dispatch] = useReducer(reducer, initialState); | ||
|
|
||
| useEffect(() => { | ||
| localStorage.setItem('todos', JSON.stringify(state.todos)); | ||
| }, [state.todos]); | ||
|
|
||
| return ( | ||
| <DispatchContext.Provider value={dispatch}> | ||
| <StateContext.Provider value={state}>{children}</StateContext.Provider> | ||
| </DispatchContext.Provider> | ||
| ); | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| import { useContext, useMemo } from 'react'; | ||
| import { DispatchContext, StateContext } from '../GlobalProvider'; | ||
| import { Filter } from '../types/Filter'; | ||
| import classNames from 'classnames'; | ||
|
|
||
| export const Footer = () => { | ||
| const { todos, filter } = useContext(StateContext); | ||
| const dispatch = useContext(DispatchContext); | ||
|
|
||
| const activeTodosCount = useMemo( | ||
| () => todos.filter(todo => !todo.completed).length, | ||
| [todos], | ||
| ); | ||
|
|
||
| const deleteCompleted = () => { | ||
| todos.forEach(todo => { | ||
| if (todo.completed) { | ||
| dispatch({ type: 'deleteTodo', payload: todo.id }); | ||
| } | ||
| }); | ||
| }; | ||
|
|
||
| if (!todos.length) { | ||
| return; | ||
| } | ||
|
|
||
| return ( | ||
| <> | ||
| <footer className="todoapp__footer" data-cy="Footer"> | ||
| <span className="todo-count" data-cy="TodosCounter"> | ||
| {`${activeTodosCount} items left`} | ||
| </span> | ||
|
|
||
| <nav className="filter" data-cy="Filter"> | ||
| {Object.values(Filter).map(currFilter => ( | ||
| <a | ||
| href={`#/${currFilter === Filter.All ? '' : currFilter.toLowerCase()}`} | ||
| className={classNames('filter__link', { | ||
| selected: currFilter === filter, | ||
| })} | ||
| data-cy={`FilterLink${currFilter}`} | ||
| key={currFilter} | ||
| onClick={() => { | ||
| dispatch({ type: 'setFilter', payload: currFilter }); | ||
| }} | ||
| > | ||
| {currFilter} | ||
| </a> | ||
| ))} | ||
| </nav> | ||
|
|
||
| <button | ||
| type="button" | ||
| className="todoapp__clear-completed" | ||
| data-cy="ClearCompletedButton" | ||
| disabled={activeTodosCount === todos.length} | ||
| onClick={deleteCompleted} | ||
| > | ||
| Clear completed | ||
| </button> | ||
| </footer> | ||
| </> | ||
| ); | ||
| }; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| import { useContext, useEffect, useMemo, useRef, useState } from 'react'; | ||
| import { DispatchContext, StateContext } from '../GlobalProvider'; | ||
| import { Todo } from '../types/Todo'; | ||
| import classNames from 'classnames'; | ||
|
|
||
| export const Header = () => { | ||
| const [title, setTitle] = useState(''); | ||
|
|
||
| const titleField = useRef<HTMLInputElement>(null); | ||
|
|
||
| const { todos } = useContext(StateContext); | ||
| const dispatch = useContext(DispatchContext); | ||
|
|
||
| useEffect(() => { | ||
| if (titleField.current) { | ||
| titleField.current.focus(); | ||
| } | ||
| }, [todos.length]); | ||
|
|
||
| const handleSubmit = (e: React.FormEvent) => { | ||
| e.preventDefault(); | ||
|
|
||
| if (!title.trim()) { | ||
| return; | ||
| } | ||
|
|
||
| const newTodo: Todo = { | ||
| id: Date.now(), | ||
| title: title.trim(), | ||
| completed: false, | ||
| }; | ||
|
|
||
| dispatch({ type: 'addTodo', payload: newTodo }); | ||
| setTitle(''); | ||
| }; | ||
|
|
||
| const handleTitleChange = (e: React.ChangeEvent<HTMLInputElement>) => { | ||
| setTitle(e.target.value); | ||
| }; | ||
|
|
||
| const allTodosCompleted = useMemo(() => { | ||
| return todos.filter(todo => todo.completed).length === todos.length; | ||
| }, [todos]); | ||
|
|
||
| const handleToggleAllButtonClick = () => { | ||
| let todosToChange = []; | ||
|
|
||
| if (allTodosCompleted) { | ||
| todosToChange = [...todos]; | ||
| } else { | ||
| todosToChange = todos.filter(todo => !todo.completed); | ||
| } | ||
|
|
||
| todosToChange.forEach(todo => { | ||
| const { id, title: todoTitle, completed } = todo; | ||
|
|
||
| dispatch({ | ||
| type: 'updateTodo', | ||
| payload: { id, title: todoTitle, completed: !completed }, | ||
| }); | ||
| }); | ||
| }; | ||
|
|
||
| return ( | ||
| <header className="todoapp__header"> | ||
| {!!todos.length && ( | ||
| <button | ||
| type="button" | ||
| className={classNames('todoapp__toggle-all', { | ||
| active: allTodosCompleted, | ||
| })} | ||
| data-cy="ToggleAllButton" | ||
| onClick={handleToggleAllButtonClick} | ||
| /> | ||
| )} | ||
|
|
||
| <form onSubmit={handleSubmit}> | ||
| <input | ||
| ref={titleField} | ||
| data-cy="NewTodoField" | ||
| type="text" | ||
| className="todoapp__new-todo" | ||
| placeholder="What needs to be done?" | ||
| value={title} | ||
| onChange={handleTitleChange} | ||
| autoFocus | ||
| /> | ||
| </form> | ||
| </header> | ||
| ); | ||
| }; |
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