snapshot of https://github.com/shadcn-ui/ui.git (main, 2026-09-15; blobs > 131072B omitted)

apps/v4/app/(app)/(styles)/sera/components/lazy-preview.tsx

@@ -0,0 +1,148 @@
+"use client"
+
+import * as React from "react"
+import dynamic from "next/dynamic"
+
+type LazyPreviewName =
+  | "articleDirectory"
+  | "emptyState"
+  | "editArticle"
+  | "mediaLibrary"
+  | "mediaLibraryTable"
+
+const PREVIEW_MIN_HEIGHTS: Record<LazyPreviewName, number> = {
+  articleDirectory: 760,
+  emptyState: 560,
+  editArticle: 980,
+  mediaLibrary: 880,
+  mediaLibraryTable: 980,
+}
+
+const ArticleDirectoryPreview = dynamic(
+  () => import("../article-directory").then((mod) => mod.ArticleDirectory),
+  {
+    ssr: false,
+    loading: () => (
+      <PreviewPlaceholder minHeight={PREVIEW_MIN_HEIGHTS.articleDirectory} />
+    ),
+  }
+)
+
+const EmptyStatePreview = dynamic(
+  () => import("../empty-state").then((mod) => mod.EmptyState),
+  {
+    ssr: false,
+    loading: () => (
+      <PreviewPlaceholder minHeight={PREVIEW_MIN_HEIGHTS.emptyState} />
+    ),
+  }
+)
+
+const EditArticlePreview = dynamic(
+  () => import("../edit-article").then((mod) => mod.EditArticle),
+  {
+    ssr: false,
+    loading: () => (
+      <PreviewPlaceholder minHeight={PREVIEW_MIN_HEIGHTS.editArticle} />
+    ),
+  }
+)
+
+const MediaLibraryPreview = dynamic(
+  () => import("../media-library").then((mod) => mod.MediaLibrary),
+  {
+    ssr: false,
+    loading: () => (
+      <PreviewPlaceholder minHeight={PREVIEW_MIN_HEIGHTS.mediaLibrary} />
+    ),
+  }
+)
+
+const MediaLibraryTablePreview = dynamic(
+  () => import("../media-library-table").then((mod) => mod.MediaLibraryTable),
+  {
+    ssr: false,
+    loading: () => (
+      <PreviewPlaceholder minHeight={PREVIEW_MIN_HEIGHTS.mediaLibraryTable} />
+    ),
+  }
+)
+
+const PREVIEW_COMPONENTS: Record<LazyPreviewName, React.ComponentType> = {
+  articleDirectory: ArticleDirectoryPreview,
+  emptyState: EmptyStatePreview,
+  editArticle: EditArticlePreview,
+  mediaLibrary: MediaLibraryPreview,
+  mediaLibraryTable: MediaLibraryTablePreview,
+}
+
+export function LazyPreview({ name }: { name: LazyPreviewName }) {
+  const containerRef = React.useRef<HTMLDivElement>(null)
+  const [shouldRender, setShouldRender] = React.useState(false)
+  const PreviewComponent = PREVIEW_COMPONENTS[name]
+
+  React.useEffect(() => {
+    if (shouldRender) {
+      return
+    }
+
+    const container = containerRef.current
+
+    if (!container || !("IntersectionObserver" in window)) {
+      setShouldRender(true)
+      return
+    }
+
+    const observer = new IntersectionObserver(
+      (entries) => {
+        if (!entries.some((entry) => entry.isIntersecting)) {
+          return
+        }
+
+        setShouldRender(true)
+        observer.disconnect()
+      },
+      {
+        rootMargin: "800px 0px",
+      }
+    )
+
+    observer.observe(container)
+
+    return () => observer.disconnect()
+  }, [shouldRender])
+
+  return (
+    <div ref={containerRef}>
+      {shouldRender ? (
+        <PreviewComponent />
+      ) : (
+        <PreviewPlaceholder minHeight={PREVIEW_MIN_HEIGHTS[name]} />
+      )}
+    </div>
+  )
+}
+
+function PreviewPlaceholder({ minHeight }: { minHeight: number }) {
+  return (
+    <div
+      aria-hidden="true"
+      className="preview theme-taupe @container/preview w-full flex-1 bg-muted p-4 font-sans ring-1 ring-foreground/5 [--gap:--spacing(4)] sm:p-6 md:[--gap:--spacing(6)] xl:[--gap:--spacing(8)]"
+      style={{ minHeight }}
+    >
+      <div className="container flex flex-col gap-(--gap) py-(--gap)">
+        <div className="flex items-center justify-between gap-4">
+          <div className="flex flex-col gap-3">
+            <div className="h-5 w-44 bg-background/80" />
+            <div className="h-3 w-56 max-w-full bg-background/60" />
+          </div>
+          <div className="hidden h-8 w-28 bg-background/70 sm:block" />
+        </div>
+        <div className="grid grid-cols-1 gap-(--gap) md:grid-cols-3">
+          <div className="min-h-48 bg-background/70 md:col-span-2" />
+          <div className="min-h-48 bg-background/70" />
+        </div>
+      </div>
+    </div>
+  )
+}