From fab698d676d43a46b0fd5df592915ca12111dbcb Mon Sep 17 00:00:00 2001
From: Michael Hunteman <michael@huntm.net>
Date: Fri, 1 Nov 2024 14:10:11 -0700
Subject: Blurry load

---
 client/src/useBlurryLoad.ts | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 client/src/useBlurryLoad.ts

(limited to 'client/src/useBlurryLoad.ts')

diff --git a/client/src/useBlurryLoad.ts b/client/src/useBlurryLoad.ts
new file mode 100644
index 0000000..59069d2
--- /dev/null
+++ b/client/src/useBlurryLoad.ts
@@ -0,0 +1,38 @@
+import { useEffect } from 'react';
+import './blurry-load.css';
+
+export interface UseBlurryLoadProps {
+  toBlurImages?: Element[];
+}
+
+export const useBlurryLoad = (props?: UseBlurryLoadProps) => {
+  const { toBlurImages = [] } = props ?? {};
+
+  useEffect(() => {
+    const images: Element[] = [...toBlurImages];
+    if (toBlurImages.length === 0) {
+      images.push(...document.querySelectorAll('.blurry-load'));
+    }
+
+    const lazyImageObserver = new IntersectionObserver(function (entries) {
+      entries.forEach(function (entry) {
+        if (!entry.isIntersecting) return;
+
+        const image = entry.target;
+        const currentImage = new Image();
+        currentImage.setAttribute(
+          'src',
+          image.getAttribute('data-large') ?? ''
+        );
+
+        currentImage.onload = () => {
+          image.setAttribute('src', currentImage.src);
+          image.classList.add('blur-out');
+        };
+        lazyImageObserver.unobserve(image);
+      });
+    });
+
+    images.forEach((img) => lazyImageObserver.observe(img));
+  }, [toBlurImages]);
+};
-- 
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