106 lines
3.7 KiB
TypeScript
106 lines
3.7 KiB
TypeScript
import React, { useCallback, useEffect, useState } from "react";
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import { Link } from "@/components/common/Link";
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import clsx from "clsx";
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import { type Section, type Subsection } from "@/lib/sections";
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export function TableOfContents({ tableOfContents }: { tableOfContents: Array<Section> }) {
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const [currentSection, setCurrentSection] = useState(tableOfContents[0]?.id);
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const getHeadings = useCallback((tableOfContents: Array<Section>) => {
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return tableOfContents
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.flatMap((node) => [node.id, ...node.children.map((child) => child.id)])
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.map((id) => {
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const el = document.getElementById(id);
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if (!el) return null;
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const style = window.getComputedStyle(el);
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const scrollMt = parseFloat(style.scrollMarginTop);
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const top = window.scrollY + el.getBoundingClientRect().top - scrollMt;
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return { id, top };
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})
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.filter((x): x is { id: string; top: number } => x !== null);
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}, []);
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useEffect(() => {
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if (tableOfContents.length === 0) return;
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const headings = getHeadings(tableOfContents);
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function onScroll() {
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const top = window.scrollY;
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let current = headings[0]?.id;
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for (const heading of headings) {
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if (top < heading.top - 10) break;
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current = heading.id;
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}
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setCurrentSection(current);
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}
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window.addEventListener("scroll", onScroll, { passive: true });
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onScroll();
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return () => {
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window.removeEventListener("scroll", onScroll);
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};
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}, [getHeadings, tableOfContents]);
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function isActive(section: Section | Subsection) {
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if (section.id === currentSection) return true;
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if (!section.children) return false;
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return section.children.findIndex(isActive) > -1;
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}
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return (
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<div className="hidden xl:sticky xl:top-[4.75rem] xl:-mr-6 xl:block xl:h-[calc(100vh-4.75rem)] xl:flex-none xl:overflow-y-auto xl:py-16 xl:pr-6">
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<nav aria-labelledby="on-this-page-title" className="w-56">
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{tableOfContents.length > 0 && (
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<>
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<h2 id="on-this-page-title" className="font-display text-sm font-medium text-slate-900 dark:text-white">
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Table des matières
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</h2>
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<ol role="list" className="mt-4 space-y-3 text-sm">
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{tableOfContents.map((section) => (
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<li key={section.id}>
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<h3>
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<Link
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href={`#${section.id}`}
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className={clsx(
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isActive(section)
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? "text-violet-500"
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: "font-normal text-slate-500 hover:text-slate-700 dark:text-slate-400 dark:hover:text-slate-300",
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)}
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>
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{section.title}
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</Link>
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</h3>
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{section.children.length > 0 && (
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<ol role="list" className="mt-2 space-y-3 pl-5 text-slate-500 dark:text-slate-400">
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{section.children.map((subSection) => (
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<li key={subSection.id}>
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<Link
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href={`#${subSection.id}`}
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className={
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isActive(subSection)
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? "text-violet-500"
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: "hover:text-slate-600 dark:hover:text-slate-300"
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}
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>
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{subSection.title}
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</Link>
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</li>
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))}
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</ol>
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)}
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</li>
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))}
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</ol>
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</>
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)}
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</nav>
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</div>
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);
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}
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