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TouchScrollable.js
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TouchScrollable.js
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// @flow
import { cloneElement, PureComponent, type Element, type ElementRef } from 'react';
import { canUseEventListeners } from 'exenv';
import { allowTouchMove, preventInertiaScroll, listenerOptions } from './utils';
export type ChildrenType = Element<*> | ElementRef<*> => Element<*>;
type Props = {
// allow touch-scroll on this element
children: ChildrenType,
};
export class TouchScrollable extends PureComponent<Props> {
scrollableArea: HTMLElement;
getScrollableArea = (ref: HTMLElement) => {
this.scrollableArea = ref;
};
componentDidMount() {
if (!canUseEventListeners) return;
this.scrollableArea.addEventListener(
'touchstart',
preventInertiaScroll,
listenerOptions,
);
this.scrollableArea.addEventListener(
'touchmove',
allowTouchMove,
listenerOptions,
);
}
componentWillUnmount() {
if (!canUseEventListeners) return;
this.scrollableArea.removeEventListener(
'touchstart',
preventInertiaScroll,
listenerOptions,
);
this.scrollableArea.removeEventListener(
'touchmove',
allowTouchMove,
listenerOptions,
);
}
render() {
const { children, ...rest } = this.props;
return typeof children === 'function'
? children(this.getScrollableArea)
: cloneElement(children, { ref: this.getScrollableArea, ...rest });
}
}