| 1 | import { useContext, useEffect, useMemo, useState } from "react"; |
| 2 | import { app } from "../lib/bridge"; |
| 3 | import { hasMarkdownImageResolver, markdownImageSource, type MarkdownImageView } from "../lib/markdownImage"; |
| 4 | import { RichMarkdownLink } from "./githubLink"; |
| 5 | import { MarkdownImageTabContext } from "./MarkdownImageContext"; |
| 6 | |
| 7 | export function MarkdownImage({ src, alt, title }: { src?: string; alt?: string; title?: string }) { |
| 8 | const tabId = useContext(MarkdownImageTabContext); |
| 9 | const source = src?.trim() ?? ""; |
| 10 | const resolverAvailable = hasMarkdownImageResolver(); |
| 11 | const legacyView = useMemo<MarkdownImageView>( |
| 12 | () => ({ url: markdownImageSource(source), openHref: /^https?:\/\//i.test(source) ? source : undefined }), |
| 13 | [source], |
| 14 | ); |
| 15 | const [resolved, setResolved] = useState<MarkdownImageView | null>(() => resolverAvailable ? null : legacyView); |
| 16 | const [loadFailed, setLoadFailed] = useState(false); |
| 17 | |
| 18 | useEffect(() => { |
| 19 | let live = true; |
| 20 | setLoadFailed(false); |
| 21 | if (!hasMarkdownImageResolver()) { |
| 22 | setResolved(legacyView); |
| 23 | return () => { live = false; }; |
| 24 | } |
| 25 | setResolved(null); |
| 26 | void app.ResolveMarkdownImageForTab(tabId, source).then((view) => { |
| 27 | if (live) setResolved(view); |
| 28 | }).catch(() => { |
| 29 | if (live) setResolved({ url: "", errorCode: "resolve-failed" }); |
| 30 | }); |
| 31 | return () => { live = false; }; |
| 32 | }, [legacyView, source, tabId]); |
| 33 | |
| 34 | const unavailable = loadFailed || Boolean(resolved?.errorCode) || (resolved !== null && !resolved.url); |
| 35 | if (unavailable) { |
| 36 | const label = alt?.trim() || resolved?.filename || "Image unavailable"; |
| 37 | return ( |
| 38 | <span className="md-image-fallback" role="img" aria-label={label} title={resolved?.errorCode || title}> |
| 39 | <span>{label}</span> |
| 40 | {resolved?.openHref && <RichMarkdownLink href={resolved.openHref}>Open image</RichMarkdownLink>} |
| 41 | </span> |
| 42 | ); |
| 43 | } |
| 44 | if (!resolved) { |
| 45 | return <span className="md-image-placeholder" role="status" aria-label={alt?.trim() || "Loading image"} />; |
| 46 | } |
| 47 | return ( |
| 48 | <img |
| 49 | src={resolved.url} |
| 50 | alt={alt ?? ""} |
| 51 | title={title} |
| 52 | loading="lazy" |
| 53 | decoding="async" |
| 54 | referrerPolicy="no-referrer" |
| 55 | onError={() => setLoadFailed(true)} |
| 56 | /> |
| 57 | ); |
| 58 | } |
| 59 |