import { computePosition, flip, inline, shift } from "@floating-ui/dom" import { normalizeRelativeURLs } from "../../util/path" const p = new DOMParser() async function mouseEnterHandler( this: HTMLLinkElement, { clientX, clientY }: { clientX: number; clientY: number }, ) { const link = this if (link.dataset.noPopover === "true") { return } async function setPosition(popoverElement: HTMLElement) { const { x, y } = await computePosition(link, popoverElement, { middleware: [inline({ x: clientX, y: clientY }), shift(), flip()], }) Object.assign(popoverElement.style, { left: `${x}px`, top: `${y}px`, }) } const hasAlreadyBeenFetched = () => [...link.children].some((child) => child.classList.contains("popover")) // dont refetch if there's already a popover if (hasAlreadyBeenFetched()) { return setPosition(link.lastChild as HTMLElement) } const thisUrl = new URL(document.location.href) thisUrl.hash = "" thisUrl.search = "" const targetUrl = new URL(link.href) const hash = targetUrl.hash targetUrl.hash = "" targetUrl.search = "" const response = await fetch(`${targetUrl}`).catch((err) => { console.error(err) }) // bailout if another popover exists if (hasAlreadyBeenFetched()) { return } if (!response) return const [contentType] = response.headers.get("Content-Type")!.split(";") const [contentTypeCategory, typeInfo] = contentType.split("/") const popoverElement = document.createElement("div") popoverElement.classList.add("popover") const popoverInner = document.createElement("div") popoverInner.classList.add("popover-inner") popoverElement.appendChild(popoverInner) popoverInner.dataset.contentType = contentType ?? undefined switch (contentTypeCategory) { case "image": const img = document.createElement("img") response.blob().then((blob) => { img.src = URL.createObjectURL(blob) }) img.alt = targetUrl.pathname popoverInner.appendChild(img) break case "application": switch (typeInfo) { case "pdf": const pdf = document.createElement("iframe") pdf.src = targetUrl.toString() popoverInner.appendChild(pdf) break default: break } break default: const contents = await response.text() const html = p.parseFromString(contents, "text/html") normalizeRelativeURLs(html, targetUrl) const elts = [...html.getElementsByClassName("popover-hint")] if (elts.length === 0) return elts.forEach((elt) => popoverInner.appendChild(elt)) } setPosition(popoverElement) link.appendChild(popoverElement) if (hash !== "") { const heading = popoverInner.querySelector(hash) as HTMLElement | null if (heading) { // leave ~12px of buffer when scrolling to a heading popoverInner.scroll({ top: heading.offsetTop - 12, behavior: "instant" }) } } } document.addEventListener("nav", () => { const links = [...document.getElementsByClassName("internal")] as HTMLLinkElement[] for (const link of links) { link.addEventListener("mouseenter", mouseEnterHandler) window.addCleanup(() => link.removeEventListener("mouseenter", mouseEnterHandler)) } })