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| import React, { useReducer } from 'react'; | |
| import './styles.scss'; | |
| type Views = 'All' | 'Details'; | |
| type State = { view: Views }; | |
| export type AppActions = | |
| | { | |
| readonly type: 'ResetView'; | |
| } | |
| | { | |
| readonly type: 'SetView'; | |
| readonly payload: Views; | |
| }; | |
| const initialState: State = { view: 'All' }; | |
| function reducer(state: State, action: AppActions): State { | |
| switch (action.type) { | |
| case 'ResetView': | |
| return { ...state, view: 'All' }; | |
| case 'SetView': | |
| return { ...state, view: action.payload }; | |
| default: | |
| return state; | |
| } | |
| } | |
| const Title: React.FunctionComponent<{ view: Views }> = ({ view }) => { | |
| switch (view) { | |
| case 'All': | |
| return <>All Page</>; | |
| case 'Details': | |
| return <>Details Page</>; | |
| default: | |
| return <></>; | |
| } | |
| }; | |
| const NavButton: React.FunctionComponent<{ | |
| view: Views; | |
| dispatch: React.Dispatch<AppActions>; | |
| }> = ({ view, dispatch }) => { | |
| switch (view) { | |
| case 'All': | |
| return ( | |
| <button | |
| onClick={() => dispatch({ type: 'SetView', payload: 'Details' })} | |
| > | |
| Switch to Details Page | |
| </button> | |
| ); | |
| case 'Details': | |
| return ( | |
| <button onClick={() => dispatch({ type: 'SetView', payload: 'All' })}> | |
| Switch to All Page | |
| </button> | |
| ); | |
| default: | |
| return null; | |
| } | |
| }; | |
| const App: React.FunctionComponent = () => { | |
| const [state, dispatch] = useReducer(reducer, initialState); | |
| const { view } = state; | |
| return ( | |
| <div> | |
| <h1> | |
| <Title view={view} /> | |
| </h1> | |
| <div> | |
| <NavButton view={view} dispatch={dispatch} /> | |
| </div> | |
| </div> | |
| ); | |
| }; | |
| export default App; |
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