32 lines
870 B
TypeScript
32 lines
870 B
TypeScript
import { useState, useEffect } from 'react';
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// Shared cache and listeners
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const gameImages: { [id: string]: string } = {};
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const listeners: { [id: string]: Set<(url: string) => void> } = {};
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export function useThumbnailURL(img: string) {
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const [status, setStatus] = useState<string | undefined>(gameImages[img]);
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useEffect(() => {
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if (!listeners[img]) listeners[img] = new Set();
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const update = (url: string) => setStatus(url);
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listeners[img].add(update);
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// If the image is already available, set it immediately
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if (gameImages[img]) setStatus(gameImages[img]);
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return () => {
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listeners[img].delete(update);
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if (listeners[img].size === 0) delete listeners[img];
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};
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}, [img]);
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return status;
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}
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export function addThumbnail(id: string, url: string) {
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gameImages[id] = url;
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if (listeners[id]) {
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listeners[id].forEach(cb => cb(url));
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}
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} |