77 lines
1.9 KiB
JavaScript
77 lines
1.9 KiB
JavaScript
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import * as React from 'react';
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import Box from '@mui/material/Box';
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import Fade from '@mui/material/Fade';
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import Button from '@mui/material/Button';
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import CircularProgress from '@mui/material/CircularProgress';
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import Typography from '@mui/material/Typography';
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export default function DelayingAppearance() {
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const [loading, setLoading] = React.useState(false);
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const [query, setQuery] = React.useState('idle');
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const timerRef = React.useRef(undefined);
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React.useEffect(
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() => () => {
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clearTimeout(timerRef.current);
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},
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[],
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);
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const handleClickLoading = () => {
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setLoading((prevLoading) => !prevLoading);
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};
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const handleClickQuery = () => {
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if (timerRef.current) {
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clearTimeout(timerRef.current);
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}
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if (query !== 'idle') {
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setQuery('idle');
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return;
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}
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setQuery('progress');
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timerRef.current = setTimeout(() => {
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setQuery('success');
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}, 2000);
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};
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return (
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<Box sx={{ display: 'flex', flexDirection: 'column', alignItems: 'center' }}>
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<Box sx={{ height: 40 }}>
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<Fade
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in={loading}
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style={{
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transitionDelay: loading ? '800ms' : '0ms',
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}}
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unmountOnExit
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>
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<CircularProgress />
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</Fade>
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</Box>
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<Button onClick={handleClickLoading} sx={{ m: 2 }}>
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{loading ? 'Stop loading' : 'Loading'}
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</Button>
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<Box sx={{ height: 40 }}>
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{query === 'success' ? (
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<Typography>Success!</Typography>
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) : (
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<Fade
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in={query === 'progress'}
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style={{
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transitionDelay: query === 'progress' ? '800ms' : '0ms',
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}}
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unmountOnExit
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>
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<CircularProgress />
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</Fade>
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)}
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</Box>
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<Button onClick={handleClickQuery} sx={{ m: 2 }}>
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{query !== 'idle' ? 'Reset' : 'Simulate a load'}
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</Button>
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</Box>
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);
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}
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