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February 16, 2021 22:29
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React hooks useReducer + useContext - Curso React
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| import P from 'prop-types'; | |
| import { createContext, useContext, useReducer, useRef } from 'react'; | |
| import './App.css'; | |
| // actions.js | |
| export const actions = { | |
| CHANGE_TITLE: 'CHANGE_TITLE', | |
| }; | |
| // data.js | |
| export const globalState = { | |
| title: 'O título que contexto', | |
| body: 'O body do contexto', | |
| counter: 0, | |
| }; | |
| // reducer.js | |
| export const reducer = (state, action) => { | |
| switch (action.type) { | |
| case actions.CHANGE_TITLE: { | |
| console.log('Mudar título'); | |
| return { ...state, title: action.payload }; | |
| } | |
| } | |
| return { ...state }; | |
| }; | |
| // AppContext.jsx | |
| export const Context = createContext(); | |
| export const AppContext = ({ children }) => { | |
| const [state, dispatch] = useReducer(reducer, globalState); | |
| const changeTitle = (payload) => { | |
| dispatch({ type: actions.CHANGE_TITLE, payload }); | |
| }; | |
| return ( | |
| <Context.Provider value={{ state, changeTitle }}> | |
| {children} | |
| </Context.Provider> | |
| ); | |
| }; | |
| AppContext.propTypes = { | |
| children: P.node, | |
| }; | |
| // H1/index.jsx | |
| export const H1 = () => { | |
| const context = useContext(Context); | |
| const inputRef = useRef(); | |
| return ( | |
| <> | |
| <h1 onClick={() => context.changeTitle(inputRef.current.value)}> | |
| {context.state.title} | |
| </h1> | |
| <input type="text" ref={inputRef} /> | |
| </> | |
| ); | |
| }; | |
| // App.jsx | |
| function App() { | |
| return ( | |
| <AppContext> | |
| <div> | |
| <H1 /> | |
| </div> | |
| </AppContext> | |
| ); | |
| } | |
| export default App; |
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