roadmap/quartz/components/scripts/popover.inline.ts

84 lines
2.8 KiB
TypeScript

import { computePosition, flip, inline, shift } from "@floating-ui/dom"
// from micromorph/src/utils.ts
// https://github.com/natemoo-re/micromorph/blob/main/src/utils.ts#L5
export function normalizeRelativeURLs(el: Element | Document, base: string | URL) {
const update = (el: Element, attr: string, base: string | URL) => {
el.setAttribute(attr, new URL(el.getAttribute(attr)!, base).pathname)
}
el.querySelectorAll('[href^="./"], [href^="../"]').forEach((item) => update(item, "href", base))
el.querySelectorAll('[src^="./"], [src^="../"]').forEach((item) => update(item, "src", base))
}
const p = new DOMParser()
async function mouseEnterHandler(
this: HTMLLinkElement,
{ clientX, clientY }: { clientX: number; clientY: number },
) {
const link = this
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`,
})
}
// dont refetch if there's already a popover
if ([...link.children].some((child) => child.classList.contains("popover"))) {
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 = ""
// prevent hover of the same page
if (thisUrl.toString() === targetUrl.toString()) return
const contents = await fetch(`${targetUrl}`)
.then((res) => res.text())
.catch((err) => {
console.error(err)
})
if (!contents) return
const html = p.parseFromString(contents, "text/html")
normalizeRelativeURLs(html, targetUrl)
const elts = [...html.getElementsByClassName("popover-hint")]
if (elts.length === 0) return
const popoverElement = document.createElement("div")
popoverElement.classList.add("popover")
const popoverInner = document.createElement("div")
popoverInner.classList.add("popover-inner")
popoverElement.appendChild(popoverInner)
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.removeEventListener("mouseenter", mouseEnterHandler)
link.addEventListener("mouseenter", mouseEnterHandler)
}
})