139 lines
3.4 KiB
TypeScript
139 lines
3.4 KiB
TypeScript
import { transparentize } from "polished";
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import * as React from "react";
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import { useTranslation } from "react-i18next";
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import styled from "styled-components";
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import breakpoint from "styled-components-breakpoint";
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import { EditorStyleHelper } from "@shared/editor/styles/EditorStyleHelper";
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import { depths, s } from "@shared/styles";
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import useWindowScrollPosition from "~/hooks/useWindowScrollPosition";
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const HEADING_OFFSET = 20;
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type Props = {
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/** The headings to render in the contents. */
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headings: {
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title: string;
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level: number;
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id: string;
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}[];
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};
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export default function Contents({ headings }: Props) {
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const [activeSlug, setActiveSlug] = React.useState<string>();
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const scrollPosition = useWindowScrollPosition({
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throttle: 100,
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});
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React.useEffect(() => {
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for (let key = 0; key < headings.length; key++) {
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const heading = headings[key];
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const element = window.document.getElementById(
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decodeURIComponent(heading.id)
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);
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if (element) {
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const bounding = element.getBoundingClientRect();
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if (bounding.top > HEADING_OFFSET) {
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const last = headings[Math.max(0, key - 1)];
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setActiveSlug(last.id);
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return;
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}
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}
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}
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}, [scrollPosition, headings]);
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// calculate the minimum heading level and adjust all the headings to make
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// that the top-most. This prevents the contents from being weirdly indented
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// if all of the headings in the document start at level 3, for example.
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const minHeading = headings.reduce(
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(memo, heading) => (heading.level < memo ? heading.level : memo),
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Infinity
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);
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const headingAdjustment = minHeading - 1;
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const { t } = useTranslation();
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if (headings.length === 0) {
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return <StickyWrapper />;
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}
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return (
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<StickyWrapper>
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<Heading>{t("Contents")}</Heading>
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<List>
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{headings
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.filter((heading) => heading.level < 4)
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.map((heading) => (
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<ListItem
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key={heading.id}
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level={heading.level - headingAdjustment}
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active={activeSlug === heading.id}
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>
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<Link href={`#${heading.id}`}>{heading.title}</Link>
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</ListItem>
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))}
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</List>
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</StickyWrapper>
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);
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}
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const StickyWrapper = styled.div`
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display: none;
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position: sticky;
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top: 90px;
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max-height: calc(100vh - 90px);
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width: ${EditorStyleHelper.tocWidth}px;
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padding: 0 16px;
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overflow-y: auto;
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border-radius: 8px;
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background: ${s("background")};
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transition: ${s("backgroundTransition")};
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@supports (backdrop-filter: blur(20px)) {
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backdrop-filter: blur(20px);
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background: ${(props) => transparentize(0.2, props.theme.background)};
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}
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${breakpoint("tablet")`
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display: block;
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z-index: ${depths.toc};
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`};
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`;
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const Heading = styled.h3`
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font-size: 13px;
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font-weight: 600;
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color: ${s("textTertiary")};
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letter-spacing: 0.03em;
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margin-top: 10px;
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`;
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const ListItem = styled.li<{ level: number; active?: boolean }>`
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margin-left: ${(props) => (props.level - 1) * 10}px;
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margin-bottom: 8px;
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line-height: 1.3;
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word-break: break-word;
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a {
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font-weight: ${(props) => (props.active ? "600" : "inherit")};
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color: ${(props) => (props.active ? props.theme.accent : props.theme.text)};
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}
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`;
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const Link = styled.a`
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color: ${s("text")};
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font-size: 14px;
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&:hover {
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color: ${s("accent")};
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}
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`;
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const List = styled.ol`
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padding: 0;
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list-style: none;
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`;
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