79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
// @flow
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import { observer } from "mobx-react";
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import * as React from "react";
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import styled from "styled-components";
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import useWindowSize from "hooks/useWindowSize";
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type Props = {|
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shadow?: boolean,
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topShadow?: boolean,
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bottomShadow?: boolean,
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flex?: boolean,
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|};
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function Scrollable({ shadow, topShadow, bottomShadow, flex, ...rest }: Props) {
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const ref = React.useRef<?HTMLDivElement>();
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const [topShadowVisible, setTopShadow] = React.useState(false);
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const [bottomShadowVisible, setBottomShadow] = React.useState(false);
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const { height } = useWindowSize();
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const updateShadows = React.useCallback(() => {
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const c = ref.current;
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if (!c) return;
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const scrollTop = c.scrollTop;
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const tsv = !!((shadow || topShadow) && scrollTop > 0);
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if (tsv !== topShadowVisible) {
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setTopShadow(tsv);
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}
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const wrapperHeight = c.scrollHeight - c.clientHeight;
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const bsv = !!((shadow || bottomShadow) && wrapperHeight - scrollTop !== 0);
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if (bsv !== bottomShadowVisible) {
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setBottomShadow(bsv);
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}
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}, [shadow, topShadow, bottomShadow, topShadowVisible, bottomShadowVisible]);
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React.useEffect(() => {
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updateShadows();
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}, [height, updateShadows]);
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return (
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<Wrapper
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ref={ref}
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onScroll={updateShadows}
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$flex={flex}
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$topShadowVisible={topShadowVisible}
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$bottomShadowVisible={bottomShadowVisible}
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{...rest}
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/>
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);
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}
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const Wrapper = styled.div`
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display: ${(props) => (props.$flex ? "flex" : "block")};
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flex-direction: column;
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height: 100%;
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overflow-y: auto;
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overflow-x: hidden;
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overscroll-behavior: none;
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-webkit-overflow-scrolling: touch;
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box-shadow: ${(props) => {
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if (props.$topShadowVisible && props.$bottomShadowVisible) {
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return "0 1px inset rgba(0,0,0,.1), 0 -1px inset rgba(0,0,0,.1)";
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}
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if (props.$topShadowVisible) {
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return "0 1px inset rgba(0,0,0,.1)";
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}
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if (props.$bottomShadowVisible) {
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return "0 -1px inset rgba(0,0,0,.1)";
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}
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return "none";
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}};
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transition: all 100ms ease-in-out;
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`;
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export default observer(Scrollable);
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