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Debounce mathjax rendering via cooldown instead #4173

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Merged
dae merged 2 commits into from
Jul 7, 2025
Merged

Debounce mathjax rendering via cooldown instead #4173

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64691a8
add cooldown timer
iamllama Jul 5, 2025
74242f4
debounce mathjax rendering via cooldown instead
iamllama Jul 5, 2025
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16 changes: 7 additions & 9 deletions ts/editable/Mathjax.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -38,33 +38,31 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
import { pageTheme } from "$lib/sveltelib/theme";

import { convertMathjax, unescapeSomeEntities } from "./mathjax";
import { ChangeTimer } from "./change-timer";
import { CooldownTimer } from "./cooldown-timer";

export let mathjax: string;
export let block: boolean;
export let fontSize: number;

let converted: string, title: string;

const debouncedMathjax = writable(mathjax);
const debouncer = new ChangeTimer();
$: debouncer.schedule(() => debouncedMathjax.set(mathjax), 500);
const debouncer = new CooldownTimer(500);

$: {
$: debouncer.schedule(() => {
const cache = getCache($pageTheme.isDark, fontSize);
const entry = cache.get($debouncedMathjax);
const entry = cache.get(mathjax);
if (entry) {
[converted, title] = entry;
} else {
const entry = convertMathjax(
unescapeSomeEntities($debouncedMathjax),
unescapeSomeEntities(mathjax),
$pageTheme.isDark,
fontSize,
);
[converted, title] = entry;
cache.set($debouncedMathjax, entry);
cache.set(mathjax, entry);
}
}
});
$: empty = title === "MathJax";
$: encoded = encodeURIComponent(converted);

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31 changes: 31 additions & 0 deletions ts/editable/cooldown-timer.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,31 @@
// Copyright: Ankitects Pty Ltd and contributors
// License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

export class CooldownTimer {
private executing = false;
private queuedAction: (() => void) | null = null;
private delay: number;

constructor(delayMs: number) {
this.delay = delayMs;
}

schedule(action: () => void): void {
if (this.executing) {
this.queuedAction = action;
} else {
this.executing = true;
action();
setTimeout(this.#pop.bind(this), this.delay);
}
}

#pop(): void {
this.executing = false;
if (this.queuedAction) {
const action = this.queuedAction;
this.queuedAction = null;
this.schedule(action);
}
}
}