Add infinite scroll to '/' and '/grid'

src/app/(isr)/grid/[offset]/page.tsx

@@ -1,29 +0,0 @@
-import SiteGrid from '@/components/SiteGrid';
-import PhotoGrid from '@/photo/PhotoGrid';
-import { getPhotos } from '@/services/postgres';
-
-export const runtime = 'edge';
-
-const PHOTOS_PER_PAGE = 6;
-
-export default async function GridPage(
-  { params }: { params: Record<string, string> }
-) {
-  const offset = parseInt(params.offset ?? '0');
-  
-  const photos = await getPhotos(
-    undefined,
-    PHOTOS_PER_PAGE,
-    Number.isNaN(offset) ? 0 : offset,
-  );
-  
-  return (
-    <SiteGrid
-      contentMain={<PhotoGrid
-        photos={photos}
-        offset={offset}
-        staggerOnFirstLoadOnly
-      />}
-    />
-  );
-}

src/app/(isr)/grid/page.tsx

@@ -1,8 +1,9 @@
+import MorePhotos from '@/components/MorePhotos';
 import SiteGrid from '@/components/SiteGrid';
-import { generateImageMetaForPhoto } from '@/photo';
+import { generateImageMetaForPhoto, getPhotosLimitForQuery } from '@/photo';
 import PhotoGrid from '@/photo/PhotoGrid';
 import PhotosEmptyState from '@/photo/PhotosEmptyState';
-import { getPhotos } from '@/services/postgres';
+import { getPhotos, getPhotosCount } from '@/services/postgres';
 import { Metadata } from 'next';
 
 export const runtime = 'edge';
@@ -12,16 +13,30 @@ export async function generateMetadata(): Promise<Metadata> {
   return generateImageMetaForPhoto(photos[0]);
 }
 
-export default async function GridPage() {
-  const photos = await getPhotos();
+export default async function GridPage({
+  searchParams,
+}: {
+  searchParams: { next: string };
+}) {
+  const { offset, limit } = getPhotosLimitForQuery(searchParams.next);
+
+  const photos = await getPhotos(undefined, limit);
+
+  const count = await getPhotosCount();
+
+  const showMorePhotos = count > photos.length;
   
   return (
     photos.length > 0
       ? <SiteGrid
-        contentMain={<PhotoGrid
+        contentMain={<div className="space-y-4">
+          <PhotoGrid
             photos={photos}
             staggerOnFirstLoadOnly
-        />}
+          />
+          {showMorePhotos &&
+            <MorePhotos path={`/grid?next=${offset + 1}`} />}
+        </div>}
       />
       : <PhotosEmptyState />
   );

src/app/(isr)/page.tsx

@@ -1,8 +1,10 @@
 import AnimateItems from '@/components/AnimateItems';
-import { generateImageMetaForPhoto } from '@/photo';
+import MorePhotos from '@/components/MorePhotos';
+import SiteGrid from '@/components/SiteGrid';
+import { generateImageMetaForPhoto, getPhotosLimitForQuery } from '@/photo';
 import PhotoLarge from '@/photo/PhotoLarge';
 import PhotosEmptyState from '@/photo/PhotosEmptyState';
-import { getPhotos } from '@/services/postgres';
+import { getPhotos, getPhotosCount } from '@/services/postgres';
 import { Metadata } from 'next';
 
 export const runtime = 'edge';
@@ -12,12 +14,23 @@ export async function generateMetadata(): Promise<Metadata> {
   return generateImageMetaForPhoto(photos[0]);
 }
 
-export default async function HomePage() {
-  const photos = await getPhotos();
+export default async function HomePage({
+  searchParams,
+}: {
+  searchParams: { next: string };
+}) {
+  const { offset, limit } = getPhotosLimitForQuery(searchParams.next);
+
+  const photos = await getPhotos(undefined, limit);
+
+  const count = await getPhotosCount();
+
+  const showMorePhotos = count > photos.length;
 
   return (
     photos.length > 0
-      ? <AnimateItems
+      ? <div className="space-y-4">
+        <AnimateItems
           className="space-y-2"
           duration={0.7}
           staggerDelay={0.15}
@@ -30,6 +43,11 @@ export default async function HomePage() {
               priority={index <= 1}
             />)}
         />
+        {showMorePhotos &&
+          <SiteGrid
+            contentMain={<MorePhotos path={`?next=${offset + 1}`} />}
+          />}
+      </div>
       : <PhotosEmptyState />
   );
 }

src/components/Footer.tsx

@@ -6,7 +6,11 @@ import ThemeSwitcher from '@/site/ThemeSwitcher';
 import { signOut } from 'next-auth/react';
 import Link from 'next/link';
 
-export default function Footer() {
+export default function Footer({
+  showSignOut,
+}: {
+  showSignOut?: boolean
+}) {
   return (
     <SiteGrid
       contentMain={<div className={cc(
@@ -21,6 +25,7 @@ export default function Footer() {
           >
             Admin
           </Link>
+          {showSignOut &&
             <div
               className={cc(
                 'cursor-pointer',
@@ -29,7 +34,7 @@ export default function Footer() {
               onClick={() => signOut()}
             >
               Sign out
-          </div>
+            </div>}
         </div>
         <ThemeSwitcher />
       </div>}

src/components/MorePhotos.tsx

@@ -0,0 +1,59 @@
+'use client';
+
+import { useRouter } from 'next/navigation';
+import { useCallback, useEffect, useRef, useTransition } from 'react';
+import Spinner from './Spinner';
+
+export default function MorePhotos({
+  path,
+  triggerOnView = true,
+  prefetch = true,
+}: {
+  path: string
+  triggerOnView?: boolean
+  prefetch?: boolean
+}) {
+  const router = useRouter();
+
+  if (prefetch) {
+    router.prefetch(path);
+  }
+
+  const [isPending, startTransition] = useTransition();
+
+  const buttonRef = useRef<HTMLButtonElement>(null);
+
+  const advance = useCallback(() => startTransition(() => {
+    router.push(path, { scroll: false });
+  }), [router, path]);
+
+  useEffect(() => {
+    const observer = new IntersectionObserver(e => {
+      if (triggerOnView && e[0].isIntersecting) {
+        advance();
+      }
+    }, {
+      root: null,
+      threshold: 0,
+    });
+
+    observer.observe(buttonRef.current!);
+
+    return () => observer.disconnect();
+  }, [triggerOnView, advance]);
+
+  return (
+    <button
+      ref={buttonRef}
+      className="block w-full subtle"
+      onClick={!triggerOnView ? advance : undefined}
+      disabled={triggerOnView || isPending}
+    >
+      {isPending
+        ? <span className="relative inline-block translate-y-[3px]">
+          <Spinner size={16} />
+        </span>
+        : 'More photos'}
+    </button>
+  );
+}

src/photo/index.ts

@@ -120,6 +120,18 @@ export const getNextPhoto = (photo: Photo, photos: Photo[]) => {
     : undefined;
 };
 
+export const getPhotosLimitForQuery = (
+  query?: string,
+  photosPerRequest = 12,
+) => {
+  const offsetInt = parseInt(query ?? '0');
+  const offset = (Number.isNaN(offsetInt) ? 0 : offsetInt);
+  return {
+    offset,
+    limit: photosPerRequest + offset * photosPerRequest,
+  };
+};
+
 export const generateImageMetaForPhoto = (photo?: Photo): Metadata => photo
   ? {
     openGraph: {

src/services/postgres.ts

@@ -186,6 +186,10 @@ export const getPhotos = async (
   return photos;
 };
 
+export const getPhotosCount = async () => sql`
+  SELECT COUNT(*) FROM photos
+`.then(({ rows }) => parseInt(rows[0].count, 10));
+
 export const getPhoto = async (id: string): Promise<Photo | undefined> => {
   // Check for photo id forwarding
   // and convert short ids to uuids

src/site/SiteChecklistClient.tsx

@@ -6,7 +6,7 @@ import { cc } from '@/utility/css';
 import SiteChecklistRow from './SiteChecklistRow';
 import { FiCheckSquare, FiExternalLink } from 'react-icons/fi';
 import { BiCopy, BiRefresh } from 'react-icons/bi';
-import IconButton from '@/components/LoaderIcon';
+import IconButton from '@/components/IconButton';
 import { toast } from 'sonner';
 import InfoBlock from '@/components/InfoBlock';
 

src/site/globals.css

@@ -59,4 +59,10 @@
       hover:border-gray-300 dark:hover:border-gray-600
       hover:disabled:border-gray-200
   }
+  button.subtle, .button.subtle {
+    @apply
+      disabled:shadow-none
+      disabled:bg-transparent dark:disabled:bg-transparent
+      disabled:border-gray-100 dark:disabled:border-gray-900
+  }
 }