initial commit

fluxer_app/src/utils/ImageCacheUtils.tsx

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {LRUCache} from 'lru-cache';
+
+interface ImageCacheEntry {
+	loaded: boolean;
+}
+
+const imageCache = new LRUCache<string, ImageCacheEntry>({
+	max: 500,
+	ttl: 1000 * 60 * 10,
+});
+
+const isCached = (src: string | null): boolean => {
+	if (!src) return false;
+	return imageCache.has(src);
+};
+
+export const hasImage = (src: string | null): boolean => {
+	return isCached(src);
+};
+
+export const loadImage = (src: string | null, onLoad: () => void, onError?: () => void): void => {
+	if (!src) {
+		onError?.();
+		return;
+	}
+
+	if (imageCache.has(src)) {
+		onLoad();
+		return;
+	}
+
+	const image = new Image();
+
+	image.onload = () => {
+		imageCache.set(src, {loaded: true});
+		onLoad();
+	};
+
+	image.onerror = () => {
+		onError?.();
+	};
+
+	image.src = src;
+};