107 lines
2.8 KiB
Svelte
107 lines
2.8 KiB
Svelte
<script lang="ts">
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import { cn } from "$lib/utils";
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import { usePanelHost } from "./host";
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import { linkOf, renderMarkdown } from "./markdown";
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let {
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text,
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class: className = "",
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eager = true,
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}: { text: string; class?: string; eager?: boolean } = $props();
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const NEAR = "1200px";
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const host = usePanelHost();
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const html = $derived(host.markdown ? "" : renderMarkdown(text));
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// Links inside rendered markdown are the only interactive things here:
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// real anchors, reached by pointer or by Enter on the focused link. The
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// handlers ride on the container so re-rendered HTML keeps them.
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function follow(event: MouseEvent | KeyboardEvent) {
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if (event instanceof KeyboardEvent && event.key !== "Enter") {
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return;
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}
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const link = linkOf(event);
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if (!link) {
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return;
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}
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event.preventDefault();
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event.stopPropagation();
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host.openLink(link.target, link.kind);
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}
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function links(node: HTMLElement) {
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node.addEventListener("click", follow);
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node.addEventListener("keydown", follow);
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return {
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destroy() {
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node.removeEventListener("click", follow);
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node.removeEventListener("keydown", follow);
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},
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};
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}
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// The host renders when asked; far up the thread that is when the
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// node comes near the viewport, with the plain text holding its place.
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function render(node: HTMLElement, value: string) {
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let dispose: (() => void) | undefined;
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let watcher: IntersectionObserver | null = null;
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let pending = value;
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const now = (next: string) => {
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dispose?.();
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node.classList.remove("whitespace-pre-wrap");
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dispose = host.markdown?.(node, next);
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};
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const later = (next: string) => {
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pending = next;
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node.textContent = next;
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node.classList.add("whitespace-pre-wrap");
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if (watcher) {
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return;
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}
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watcher = new IntersectionObserver(
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(entries) => {
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if (entries.some((entry) => entry.isIntersecting)) {
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watcher?.disconnect();
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watcher = null;
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now(pending);
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}
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},
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{ rootMargin: NEAR }
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);
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watcher.observe(node);
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};
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if (eager || typeof IntersectionObserver === "undefined") {
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now(value);
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} else {
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later(value);
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}
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return {
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destroy() {
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watcher?.disconnect();
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dispose?.();
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},
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update(next: string) {
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if (watcher) {
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later(next);
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} else {
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now(next);
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}
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},
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};
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}
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</script>
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{#if host.markdown}
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<div
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class={cn("beaver-md markdown-rendered", className)}
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use:links
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use:render={text}
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></div>
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{:else}
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<div class={cn("prose prose-sm max-w-none", className)} use:links>
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<!-- eslint-disable-next-line svelte/no-at-html-tags -- sanitized in renderMarkdown -->
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{@html html}
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</div>
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{/if}
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