qotnews/webclient/src/App.js

import React, { useState, useEffect, useRef, useCallback } from 'react';
import { BrowserRouter as Router, Route, Link, Switch } from 'react-router-dom';
import localForage from 'localforage';
import './Style-light.css';
import './Style-dark.css';
import './Style-black.css';
import './Style-red.css';
import './fonts/Fonts.css';
import { BackwardDot, ForwardDot } from './utils.js';
import Feed from './Feed.js';
import Article from './Article.js';
import Comments from './Comments.js';
import Search from './Search.js';
import Submit from './Submit.js';
import Results from './Results.js';
import ScrollToTop from './ScrollToTop.js';

function App() {
	const [theme, setTheme] = useState(localStorage.getItem('theme') || '');
	const cache = useRef({});
	const [isFullScreen, setIsFullScreen] = useState(!!document.fullscreenElement);
	const [waitingWorker, setWaitingWorker] = useState(null);
	const [settingsOpen, setSettingsOpen] = useState(false);
	const defaultBodyFontSize = 1.0;
	const [bodyFontSize, setBodyFontSize] = useState(Number(localStorage.getItem('bodyFontSize')) || defaultBodyFontSize);

	const updateCache = useCallback((key, value) => {
		cache.current[key] = value;
	}, []);

	const light = () => {
		setTheme('');
		localStorage.setItem('theme', '');
	};

	const dark = () => {
		setTheme('dark');
		localStorage.setItem('theme', 'dark');
	};

	const black = () => {
		setTheme('black');
		localStorage.setItem('theme', 'black');
	};

	const red = () => {
		setTheme('red');
		localStorage.setItem('theme', 'red');
	};

	const changeBodyFontSize = (amount) => {
		const newSize = bodyFontSize + amount;
		setBodyFontSize(parseFloat(newSize.toFixed(2)));
		localStorage.setItem('bodyFontSize', newSize.toFixed(2));
	};

	const resetBodyFontSize = () => {
		setBodyFontSize(defaultBodyFontSize);
		localStorage.removeItem('bodyFontSize');
	};

	const bodyFontSettingsChanged = bodyFontSize !== defaultBodyFontSize;

	useEffect(() => {
		const onSWUpdate = e => {
			setWaitingWorker(e.detail.waiting);
		};
		window.addEventListener('swUpdate', onSWUpdate);
		return () => window.removeEventListener('swUpdate', onSWUpdate);
	}, []);

	useEffect(() => {
		if (Object.keys(cache.current).length === 0) {
			localForage.iterate((value, key) => {
				updateCache(key, value);
			}).then(() => {
				console.log('loaded cache from localforage');
			});
		}
	}, [updateCache]);

	const goFullScreen = () => {
		if ('wakeLock' in navigator) {
			navigator.wakeLock.request('screen');
		}
		document.body.requestFullscreen({ navigationUI: 'hide' });
	};

	const exitFullScreen = () => {
		document.exitFullscreen();
	};

	useEffect(() => {
		const onFullScreenChange = () => setIsFullScreen(!!document.fullscreenElement);
		document.addEventListener('fullscreenchange', onFullScreenChange);
		return () => document.removeEventListener('fullscreenchange', onFullScreenChange);
	}, []);

	useEffect(() => {
		if (theme === 'dark') {
			document.body.style.backgroundColor = '#1a1a1a';
		} else if (theme === 'black') {
			document.body.style.backgroundColor = '#000';
		} else if (theme === 'red') {
			document.body.style.backgroundColor = '#000';
		} else {
			document.body.style.backgroundColor = '#eeeeee';
		}
	}, [theme]);

	useEffect(() => {
		document.documentElement.style.fontSize = `${bodyFontSize}rem`;
	}, [bodyFontSize]);


	const fullScreenAvailable = document.fullscreenEnabled ||
		document.mozFullscreenEnabled ||
		document.webkitFullscreenEnabled ||
		document.msFullscreenEnabled;

	return (
		<div className={theme}>
			{settingsOpen &&
				<div className="modal-overlay" onClick={() => setSettingsOpen(false)}>
					<div className="modal-content" onClick={e => e.stopPropagation()}>
						<h3>Settings</h3>
						<div className="setting-group">
							<h4>Theme</h4>
							<button className={theme === '' ? 'active' : ''} onClick={() => { light() }}>Light</button>
							<button className={theme === 'dark' ? 'active' : ''} onClick={() => { dark() }}>Dark</button>
							<button className={theme === 'black' ? 'active' : ''} onClick={() => { black() }}>Black</button>
							<button className={theme === 'red' ? 'active' : ''} onClick={() => { red() }}>Red</button>
						</div>
						<div className="setting-group">
							<h4>Font Size</h4>
							<button onClick={() => changeBodyFontSize(-0.05)}>-</button>
							<span className="font-size-display">{bodyFontSize.toFixed(2)}</span>
							<button onClick={() => changeBodyFontSize(0.05)}>+</button>
							<button onClick={resetBodyFontSize} disabled={!bodyFontSettingsChanged}>Reset</button>
						</div>
					</div>
				</div>
			}
			{waitingWorker &&
				<div className='update-banner'>
					Client version mismatch, please refresh:{' '}
					<button onClick={() => {
						waitingWorker.postMessage({ type: 'SKIP_WAITING' });
						navigator.serviceWorker.addEventListener('controllerchange', () => {
							window.location.reload();
						});
					}}>
						Refresh
					</button>
				</div>
			}
			<Router>
				<div className='container menu'>
					<p>
						<Link to='/'>QotNews</Link>

						<button className="settings-button" onClick={() => setSettingsOpen(true)}>Settings</button>
						<br />
						<span className='slogan'>Hacker News, Reddit, Lobsters, and Tildes articles rendered in reader mode.</span>
					</p>
					{fullScreenAvailable &&
						<Route path='/(|search)' render={() => !isFullScreen ?
							<button className='fullscreen' onClick={() => goFullScreen()}>Enter Fullscreen</button>
						:
							<button className='fullscreen' onClick={() => exitFullScreen()}>Exit Fullscreen</button>
						} />
					}
					<Route path='/(|search)' component={Search} />
					<Route path='/(|search)' component={Submit} />
				</div>

				<Route path='/' exact render={(props) => <Feed {...props} updateCache={updateCache} />} />
				<Switch>
					<Route path='/search' component={Results} />
					<Route path='/:id' exact render={(props) => <Article {...props} cache={cache.current} />} />
				</Switch>
				<Route path='/:id/c' exact render={(props) => <Comments {...props} cache={cache.current} />} />

				<BackwardDot />
				<ForwardDot />

				<ScrollToTop />
			</Router>
		</div>
	);
}

export default App;