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instrumental/app/javascript/mastodon/components/column.jsx

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import PropTypes from 'prop-types';
import { PureComponent } from 'react';
import { supportsPassiveEvents } from 'detect-passive-events';
import { scrollTop } from '../scroll';
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const listenerOptions = supportsPassiveEvents ? { passive: true } : false;
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export default class Column extends PureComponent {
static propTypes = {
children: PropTypes.node,
label: PropTypes.string,
bindToDocument: PropTypes.bool,
};
scrollTop () {
let scrollable = null;
if (this.props.bindToDocument) {
scrollable = document.scrollingElement;
} else {
scrollable = this.node.querySelector('.scrollable');
}
if (!scrollable) {
return;
}
this._interruptScrollAnimation = scrollTop(scrollable);
}
handleWheel = () => {
if (typeof this._interruptScrollAnimation !== 'function') {
return;
}
this._interruptScrollAnimation();
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};
setRef = c => {
this.node = c;
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};
componentDidMount () {
if (this.props.bindToDocument) {
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document.addEventListener('wheel', this.handleWheel, listenerOptions);
} else {
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this.node.addEventListener('wheel', this.handleWheel, listenerOptions);
}
}
componentWillUnmount () {
if (this.props.bindToDocument) {
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document.removeEventListener('wheel', this.handleWheel, listenerOptions);
} else {
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this.node.removeEventListener('wheel', this.handleWheel, listenerOptions);
}
}
render () {
const { label, children } = this.props;
return (
<div role='region' aria-label={label} className='column' ref={this.setRef}>
{children}
</div>
);
}
}