Initialize astro-v5-new-api
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264
src/components/widget/TOC.astro
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264
src/components/widget/TOC.astro
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---
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import type { MarkdownHeading } from "astro";
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import { siteConfig } from "../../config";
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interface Props {
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class?: string;
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headings: MarkdownHeading[];
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}
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let { headings = [] } = Astro.props;
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let minDepth = 10;
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for (const heading of headings) {
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minDepth = Math.min(minDepth, heading.depth);
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}
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const className = Astro.props.class;
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const isPostsRoute = Astro.url.pathname.startsWith("/posts/");
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const removeTailingHash = (text: string) => {
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let lastIndexOfHash = text.lastIndexOf("#");
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if (lastIndexOfHash !== text.length - 1) {
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return text;
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}
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return text.substring(0, lastIndexOfHash);
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};
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let heading1Count = 1;
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const maxLevel = siteConfig.toc.depth;
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---
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{isPostsRoute &&
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<table-of-contents class:list={[className, "group"]}>
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{headings.filter((heading) => heading.depth < minDepth + maxLevel).map((heading) =>
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<a href={`#${heading.id}`} class="px-2 flex gap-2 relative transition w-full min-h-9 rounded-xl
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hover:bg-[var(--toc-btn-hover)] active:bg-[var(--toc-btn-active)] py-2
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">
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<div class:list={["transition w-5 h-5 shrink-0 rounded-lg text-xs flex items-center justify-center font-bold",
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{
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"bg-[var(--toc-badge-bg)] text-[var(--btn-content)]": heading.depth == minDepth,
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"ml-4": heading.depth == minDepth + 1,
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"ml-8": heading.depth == minDepth + 2,
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}
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]}
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>
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{heading.depth == minDepth && heading1Count++}
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{heading.depth == minDepth + 1 && <div class="transition w-2 h-2 rounded-[0.1875rem] bg-[var(--toc-badge-bg)]"></div>}
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{heading.depth == minDepth + 2 && <div class="transition w-1.5 h-1.5 rounded-sm bg-black/5 dark:bg-white/10"></div>}
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</div>
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<div class:list={["transition text-sm", {
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"text-50": heading.depth == minDepth || heading.depth == minDepth + 1,
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"text-30": heading.depth == minDepth + 2,
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}]}>{removeTailingHash(heading.text)}</div>
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</a>
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)}
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<div id="active-indicator" class:list={[{'hidden': headings.length == 0}, "-z-10 absolute bg-[var(--toc-btn-hover)] left-0 right-0 rounded-xl transition-all " +
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"group-hover:bg-transparent border-2 border-[var(--toc-btn-hover)] group-hover:border-[var(--toc-btn-active)] border-dashed"]}></div>
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</table-of-contents>}
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<script>
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class TableOfContents extends HTMLElement {
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tocEl: HTMLElement | null = null;
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visibleClass = "visible";
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observer: IntersectionObserver;
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anchorNavTarget: HTMLElement | null = null;
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headingIdxMap = new Map<string, number>();
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headings: HTMLElement[] = [];
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sections: HTMLElement[] = [];
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tocEntries: HTMLAnchorElement[] = [];
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active: boolean[] = [];
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activeIndicator: HTMLElement | null = null;
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constructor() {
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super();
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this.observer = new IntersectionObserver(
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this.markVisibleSection, { threshold: 0 }
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);
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};
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markVisibleSection = (entries: IntersectionObserverEntry[]) => {
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entries.forEach((entry) => {
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const id = entry.target.children[0]?.getAttribute("id");
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const idx = id ? this.headingIdxMap.get(id) : undefined;
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if (idx != undefined)
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this.active[idx] = entry.isIntersecting;
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if (entry.isIntersecting && this.anchorNavTarget == entry.target.firstChild)
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this.anchorNavTarget = null;
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});
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if (!this.active.includes(true))
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this.fallback();
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this.update();
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};
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toggleActiveHeading = () => {
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let i = this.active.length - 1;
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let min = this.active.length - 1, max = 0;
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while (i >= 0 && !this.active[i]) {
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this.tocEntries[i].classList.remove(this.visibleClass);
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i--;
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}
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while (i >= 0 && this.active[i]) {
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this.tocEntries[i].classList.add(this.visibleClass);
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min = Math.min(min, i);
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max = Math.max(max, i);
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i--;
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}
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while (i >= 0) {
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this.tocEntries[i].classList.remove(this.visibleClass);
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i--;
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}
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let parentOffset = this.tocEl?.getBoundingClientRect().top || 0;
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let scrollOffset = this.tocEl?.scrollTop || 0;
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let top = this.tocEntries[min].getBoundingClientRect().top - parentOffset + scrollOffset;
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let bottom = this.tocEntries[max].getBoundingClientRect().bottom - parentOffset + scrollOffset;
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this.activeIndicator?.setAttribute("style", `top: ${top}px; height: ${bottom - top}px`);
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};
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scrollToActiveHeading = () => {
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// If the TOC widget can accommodate both the topmost
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// and bottommost items, scroll to the topmost item.
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// Otherwise, scroll to the bottommost one.
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if (this.anchorNavTarget || !this.tocEl) return;
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const activeHeading =
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document.querySelectorAll<HTMLDivElement>(`#toc .${this.visibleClass}`);
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if (!activeHeading.length) return;
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const topmost = activeHeading[0];
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const bottommost = activeHeading[activeHeading.length - 1];
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const tocHeight = this.tocEl.clientHeight;
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let top;
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if (bottommost.getBoundingClientRect().bottom -
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topmost.getBoundingClientRect().top < 0.9 * tocHeight)
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top = topmost.offsetTop - 32;
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else
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top = bottommost.offsetTop - tocHeight * 0.8;
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this.tocEl.scrollTo({
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top,
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left: 0,
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behavior: "smooth",
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});
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};
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update = () => {
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requestAnimationFrame(() => {
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this.toggleActiveHeading();
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// requestAnimationFrame(() => {
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this.scrollToActiveHeading();
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// });
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});
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};
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fallback = () => {
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if (!this.sections.length) return;
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for (let i = 0; i < this.sections.length; i++) {
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let offsetTop = this.sections[i].getBoundingClientRect().top;
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let offsetBottom = this.sections[i].getBoundingClientRect().bottom;
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if (this.isInRange(offsetTop, 0, window.innerHeight)
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|| this.isInRange(offsetBottom, 0, window.innerHeight)
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|| (offsetTop < 0 && offsetBottom > window.innerHeight)) {
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this.markActiveHeading(i);
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}
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else if (offsetTop > window.innerHeight) break;
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}
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};
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markActiveHeading = (idx: number)=> {
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this.active[idx] = true;
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};
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handleAnchorClick = (event: Event) => {
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const anchor = event
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.composedPath()
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.find((element) => element instanceof HTMLAnchorElement);
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if (anchor) {
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const id = decodeURIComponent(anchor.hash?.substring(1));
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const idx = this.headingIdxMap.get(id);
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if (idx !== undefined) {
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this.anchorNavTarget = this.headings[idx];
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} else {
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this.anchorNavTarget = null;
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}
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}
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};
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isInRange(value: number, min: number, max: number) {
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return min < value && value < max;
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};
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connectedCallback() {
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// wait for the onload animation to finish, which makes the `getBoundingClientRect` return correct values
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const element = document.querySelector('.prose');
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if (element) {
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element.addEventListener('animationend', () => {
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this.init();
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}, { once: true });
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} else {
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console.debug('Animation element not found');
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}
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};
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init() {
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this.tocEl = document.getElementById(
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"toc-inner-wrapper"
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);
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if (!this.tocEl) return;
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this.tocEl.addEventListener("click", this.handleAnchorClick, {
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capture: true,
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});
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this.activeIndicator = document.getElementById("active-indicator");
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this.tocEntries = Array.from(
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document.querySelectorAll<HTMLAnchorElement>("#toc a[href^='#']")
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);
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if (this.tocEntries.length === 0) return;
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this.sections = new Array(this.tocEntries.length);
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this.headings = new Array(this.tocEntries.length);
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for (let i = 0; i < this.tocEntries.length; i++) {
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const id = decodeURIComponent(this.tocEntries[i].hash?.substring(1));
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const heading = document.getElementById(id);
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const section = heading?.parentElement;
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if (heading instanceof HTMLElement && section instanceof HTMLElement) {
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this.headings[i] = heading;
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this.sections[i] = section;
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this.headingIdxMap.set(id, i);
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}
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}
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this.active = new Array(this.tocEntries.length).fill(false);
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this.sections.forEach((section) =>
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this.observer.observe(section)
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);
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this.fallback();
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this.update();
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};
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disconnectedCallback() {
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this.sections.forEach((section) =>
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this.observer.unobserve(section)
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);
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this.observer.disconnect();
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this.tocEl?.removeEventListener("click", this.handleAnchorClick);
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};
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}
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if (!customElements.get("table-of-contents")) {
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customElements.define("table-of-contents", TableOfContents);
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}
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</script>
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