Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | import React, { PureComponent } from 'react';
import PropTypes from 'prop-types';
import { withScrolling } from '../../lib/ScrollContext';
import styles from './ProgressIndicator.scss';
class ProgressIndicator extends PureComponent {
static propTypes = {
scrollTop: PropTypes.number.isRequired,
documentHeight: PropTypes.number.isRequired,
viewportHeight: PropTypes.number.isRequired,
};
constructor(props) {
super(props);
this.state = {
progress: 0,
};
}
componentDidMount() {
this.timer = setInterval(() => { this.updateProgress(); }, 30);
}
componentWillUnmount() {
clearInterval(this.timer);
}
updateProgress = () => {
const {
viewportHeight,
documentHeight,
} = this.props;
let { scrollTop } = this.props;
scrollTop = Math.max(0, scrollTop - 312);
const height = documentHeight - 312 - viewportHeight;
const percent = Math.round(scrollTop * 100 / height);
requestAnimationFrame(() => {
this.setState({
progress: percent,
});
});
}
render() {
const { progress } = this.state;
return (
<div className={styles['progress-indicator']}>
<div
className={styles['progress-indicator__indicator']}
style={{
width: `${progress}%`,
}}
/>
</div>
);
}
}
export default withScrolling(ProgressIndicator);
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