Rewrite GIFV component with React hooks (#24552)

app/javascript/mastodon/components/gifv.tsx

@@ -0,0 +1,68 @@
+import React, { useCallback, useState } from 'react';
+
+type Props = {
+  src: string;
+  key: string;
+  alt?: string;
+  lang?: string;
+  width: number;
+  height: number;
+  onClick?: () => void;
+}
+
+export const GIFV: React.FC<Props> = ({
+  src,
+  alt,
+  lang,
+  width,
+  height,
+  onClick,
+})=> {
+  const [loading, setLoading] = useState(true);
+
+  const handleLoadedData: React.ReactEventHandler<HTMLVideoElement> = useCallback(() => {
+    setLoading(false);
+  }, [setLoading]);
+
+  const handleClick: React.MouseEventHandler = useCallback((e) => {
+    if (onClick) {
+      e.stopPropagation();
+      onClick();
+    }
+  }, [onClick]);
+
+  return (
+    <div className='gifv' style={{ position: 'relative' }}>
+      {loading && (
+        <canvas
+          width={width}
+          height={height}
+          role='button'
+          tabIndex={0}
+          aria-label={alt}
+          title={alt}
+          lang={lang}
+          onClick={handleClick}
+        />
+      )}
+
+      <video
+        src={src}
+        role='button'
+        tabIndex={0}
+        aria-label={alt}
+        title={alt}
+        lang={lang}
+        muted
+        loop
+        autoPlay
+        playsInline
+        onClick={handleClick}
+        onLoadedData={handleLoadedData}
+        style={{ position: loading ? 'absolute' : 'static', top: 0, left: 0 }}
+      />
+    </div>
+  );
+};
+
+export default GIFV;