Reqorked visibility toggle on samples, should help when dealing with more samples

ui/src/components/SampleImageCard.tsx

@@ -10,6 +10,10 @@ interface SampleImageCardProps {
   className?: string;
   onDelete?: () => void;
   onClick?: () => void;
+  /** pass your scroll container element (e.g. containerRef.current) */
+  observerRoot?: Element | null;
+  /** optional: tweak pre-load buffer */
+  rootMargin?: string; // default '200px 0px'
 }
 
 const SampleImageCard: React.FC<SampleImageCardProps> = ({
@@ -20,70 +24,87 @@ const SampleImageCard: React.FC<SampleImageCardProps> = ({
   children,
   className = '',
   onClick = () => {},
+  observerRoot = null,
+  rootMargin = '200px 0px',
 }) => {
   const cardRef = useRef<HTMLDivElement>(null);
-  const [isVisible, setIsVisible] = useState<boolean>(false);
-  const [loaded, setLoaded] = useState<boolean>(false);
+  const videoRef = useRef<HTMLVideoElement | null>(null);
+  const [isVisible, setIsVisible] = useState(false);
+  const [loaded, setLoaded] = useState(false);
 
+  // Observe both enter and exit
   useEffect(() => {
-    // Create intersection observer to check visibility
+    const el = cardRef.current;
+    if (!el) return;
+
     const observer = new IntersectionObserver(
       entries => {
-        if (entries[0].isIntersecting) {
-          setIsVisible(true);
-          observer.disconnect();
+        for (const entry of entries) {
+          if (entry.target === el) {
+            setIsVisible(entry.isIntersecting);
+          }
         }
       },
-      { threshold: 0.1 },
+      {
+        root: observerRoot ?? null,
+        threshold: 0.01,
+        rootMargin,
+      },
     );
 
-    if (cardRef.current) {
-      observer.observe(cardRef.current);
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, [observerRoot, rootMargin]);
+
+  // Pause video when leaving viewport
+  useEffect(() => {
+    if (!isVideo(imageUrl)) return;
+    const v = videoRef.current;
+    if (!v) return;
+    if (!isVisible && !v.paused) {
+      try {
+        v.pause();
+      } catch {}
     }
+  }, [isVisible, imageUrl]);
 
-    return () => {
-      observer.disconnect();
-    };
-  }, []);
+  useEffect(() => {
+    console.log('SampleImageCard isVisible', isVisible, imageUrl);
+  }, [isVisible, imageUrl]);
 
-  const handleLoad = (): void => {
-    setLoaded(true);
-  };
+  const handleLoad = () => setLoaded(true);
 
   return (
     <div className={`flex flex-col ${className}`}>
-      {/* Square image container */}
-      <div
-        ref={cardRef}
-        className="relative w-full cursor-pointer"
-        style={{ paddingBottom: '100%' }} // Make it square
-        onClick={onClick}
-      >
+      <div ref={cardRef} className="relative w-full cursor-pointer" style={{ paddingBottom: '100%' }} onClick={onClick}>
         <div className="absolute inset-0 rounded-t-lg shadow-md">
-          {isVisible && (
-            <>
-              {isVideo(imageUrl) ? (
-                <video
-                  src={`/api/img/${encodeURIComponent(imageUrl)}`}
-                  className={`w-full h-full object-cover`}
-                  autoPlay={false}
-                  loop
-                  muted
-                  playsInline
-                />
-              ) : (
-                <img
-                  src={`/api/img/${encodeURIComponent(imageUrl)}`}
-                  alt={alt}
-                  onLoad={handleLoad}
-                  className={`w-full h-full object-cover transition-opacity duration-300 ${
-                    loaded ? 'opacity-100' : 'opacity-0'
-                  }`}
-                />
-              )}
-            </>
-          )}
-          {children && <div className="absolute inset-0 flex items-center justify-center">{children}</div>}
+          {isVisible ? (
+            isVideo(imageUrl) ? (
+              <video
+                ref={videoRef}
+                src={`/api/img/${encodeURIComponent(imageUrl)}`}
+                className="w-full h-full object-cover"
+                preload="none"
+                playsInline
+                muted
+                loop
+                controls={false}
+              />
+            ) : (
+              <img
+                src={`/api/img/${encodeURIComponent(imageUrl)}`}
+                alt={alt}
+                onLoad={handleLoad}
+                loading="lazy"
+                decoding="async"
+                className={`w-full h-full object-cover transition-opacity duration-300 ${
+                  loaded ? 'opacity-100' : 'opacity-0'
+                }`}
+              />
+            )
+          ) : null}
+
+          {children && isVisible && <div className="absolute inset-0 flex items-center justify-center">{children}</div>}
         </div>
       </div>
     </div>

ui/src/components/SampleImages.tsx

@@ -1,4 +1,4 @@
-import { useMemo, useState } from 'react';
+import { useMemo, useState, useRef } from 'react';
 import useSampleImages from '@/hooks/useSampleImages';
 import SampleImageCard from './SampleImageCard';
 import { Job } from '@prisma/client';
@@ -68,6 +68,7 @@ interface SampleImagesProps {
 export default function SampleImages({ job }: SampleImagesProps) {
   const { sampleImages, status, refreshSampleImages } = useSampleImages(job.id, 5000);
   const [selectedSamplePath, setSelectedSamplePath] = useState<string | null>(null);
+  const containerRef = useRef<HTMLDivElement>(null);
   const numSamples = useMemo(() => {
     if (job?.job_config) {
       const jobConfig = JSON.parse(job.job_config) as JobConfig;
@@ -232,7 +233,7 @@ export default function SampleImages({ job }: SampleImagesProps) {
   }, [job]);
 
   return (
-    <div>
+    <div ref={containerRef} className="absolute top-[80px] left-0 right-0 bottom-0 overflow-y-auto">
       <div className="pb-4">
         {PageInfoContent}
         {sampleImages && (
@@ -245,6 +246,7 @@ export default function SampleImages({ job }: SampleImagesProps) {
                 sampleImages={sampleImages}
                 alt="Sample Image"
                 onClick={() => setSelectedSamplePath(sample)}
+                observerRoot={containerRef.current}
               />
             ))}
           </div>