fix: prevent empty state flash and add skeleton loading for app list (#30616)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

web/app/components/apps/app-card-skeleton.tsx

@@ -0,0 +1,41 @@
+'use client'
+
+import * as React from 'react'
+import { SkeletonContainer, SkeletonRectangle, SkeletonRow } from '@/app/components/base/skeleton'
+
+type AppCardSkeletonProps = {
+  count?: number
+}
+
+/**
+ * Skeleton placeholder for App cards during loading states.
+ * Matches the visual layout of AppCard component.
+ */
+export const AppCardSkeleton = React.memo(({ count = 6 }: AppCardSkeletonProps) => {
+  return (
+    <>
+      {Array.from({ length: count }).map((_, index) => (
+        <div
+          key={index}
+          className="h-[160px] rounded-xl border-[0.5px] border-components-card-border bg-components-card-bg p-4"
+        >
+          <SkeletonContainer className="h-full">
+            <SkeletonRow>
+              <SkeletonRectangle className="h-10 w-10 rounded-lg" />
+              <div className="flex flex-1 flex-col gap-1">
+                <SkeletonRectangle className="h-4 w-2/3" />
+                <SkeletonRectangle className="h-3 w-1/3" />
+              </div>
+            </SkeletonRow>
+            <div className="mt-4 flex flex-col gap-2">
+              <SkeletonRectangle className="h-3 w-full" />
+              <SkeletonRectangle className="h-3 w-4/5" />
+            </div>
+          </SkeletonContainer>
+        </div>
+      ))}
+    </>
+  )
+})
+
+AppCardSkeleton.displayName = 'AppCardSkeleton'

web/app/components/apps/list.tsx

@@ -27,7 +27,9 @@ import { useGlobalPublicStore } from '@/context/global-public-context'
 import { CheckModal } from '@/hooks/use-pay'
 import { useInfiniteAppList } from '@/service/use-apps'
 import { AppModeEnum } from '@/types/app'
+import { cn } from '@/utils/classnames'
 import AppCard from './app-card'
+import { AppCardSkeleton } from './app-card-skeleton'
 import Empty from './empty'
 import Footer from './footer'
 import useAppsQueryState from './hooks/use-apps-query-state'
@@ -45,7 +47,7 @@ const List = () => {
   const { t } = useTranslation()
   const { systemFeatures } = useGlobalPublicStore()
   const router = useRouter()
-  const { isCurrentWorkspaceEditor, isCurrentWorkspaceDatasetOperator } = useAppContext()
+  const { isCurrentWorkspaceEditor, isCurrentWorkspaceDatasetOperator, isLoadingCurrentWorkspace } = useAppContext()
   const showTagManagementModal = useTagStore(s => s.showTagManagementModal)
   const [activeTab, setActiveTab] = useQueryState(
     'category',
@@ -89,6 +91,7 @@ const List = () => {
   const {
     data,
     isLoading,
+    isFetching,
     isFetchingNextPage,
     fetchNextPage,
     hasNextPage,
@@ -172,6 +175,8 @@ const List = () => {
 
   const pages = data?.pages ?? []
   const hasAnyApp = (pages[0]?.total ?? 0) > 0
+  // Show skeleton during initial load or when refetching with no previous data
+  const showSkeleton = isLoading || (isFetching && pages.length === 0)
 
   return (
     <>
@@ -205,23 +210,34 @@ const List = () => {
             />
           </div>
         </div>
-        {hasAnyApp
-          ? (
-              <div className="relative grid grow grid-cols-1 content-start gap-4 px-12 pt-2 sm:grid-cols-1 md:grid-cols-2 xl:grid-cols-4 2xl:grid-cols-5 2k:grid-cols-6">
-                {isCurrentWorkspaceEditor
-                  && <NewAppCard ref={newAppCardRef} onSuccess={refetch} selectedAppType={activeTab} />}
-                {pages.map(({ data: apps }) => apps.map(app => (
-                  <AppCard key={app.id} app={app} onRefresh={refetch} />
-                )))}
-              </div>
-            )
-          : (
-              <div className="relative grid grow grid-cols-1 content-start gap-4 overflow-hidden px-12 pt-2 sm:grid-cols-1 md:grid-cols-2 xl:grid-cols-4 2xl:grid-cols-5 2k:grid-cols-6">
-                {isCurrentWorkspaceEditor
-                  && <NewAppCard ref={newAppCardRef} className="z-10" onSuccess={refetch} selectedAppType={activeTab} />}
-                <Empty />
-              </div>
-            )}
+        <div className={cn(
+          'relative grid grow grid-cols-1 content-start gap-4 px-12 pt-2 sm:grid-cols-1 md:grid-cols-2 xl:grid-cols-4 2xl:grid-cols-5 2k:grid-cols-6',
+          !hasAnyApp && 'overflow-hidden',
+        )}
+        >
+          {(isCurrentWorkspaceEditor || isLoadingCurrentWorkspace) && (
+            <NewAppCard
+              ref={newAppCardRef}
+              isLoading={isLoadingCurrentWorkspace}
+              onSuccess={refetch}
+              selectedAppType={activeTab}
+              className={cn(!hasAnyApp && 'z-10')}
+            />
+          )}
+          {(() => {
+            if (showSkeleton)
+              return <AppCardSkeleton count={6} />
+
+            if (hasAnyApp) {
+              return pages.flatMap(({ data: apps }) => apps).map(app => (
+                <AppCard key={app.id} app={app} onRefresh={refetch} />
+              ))
+            }
+
+            // No apps - show empty state
+            return <Empty />
+          })()}
+        </div>
 
         {isCurrentWorkspaceEditor && (
           <div

web/app/components/apps/new-app-card.tsx

@@ -25,6 +25,7 @@ const CreateFromDSLModal = dynamic(() => import('@/app/components/app/create-fro
 
 export type CreateAppCardProps = {
   className?: string
+  isLoading?: boolean
   onSuccess?: () => void
   ref: React.RefObject<HTMLDivElement | null>
   selectedAppType?: string
@@ -33,6 +34,7 @@ export type CreateAppCardProps = {
 const CreateAppCard = ({
   ref,
   className,
+  isLoading = false,
   onSuccess,
   selectedAppType,
 }: CreateAppCardProps) => {
@@ -56,7 +58,11 @@ const CreateAppCard = ({
   return (
     <div
       ref={ref}
-      className={cn('relative col-span-1 inline-flex h-[160px] flex-col justify-between rounded-xl border-[0.5px] border-components-card-border bg-components-card-bg', className)}
+      className={cn(
+        'relative col-span-1 inline-flex h-[160px] flex-col justify-between rounded-xl border-[0.5px] border-components-card-border bg-components-card-bg transition-opacity',
+        isLoading && 'pointer-events-none opacity-50',
+        className,
+      )}
     >
       <div className="grow rounded-t-xl p-2">
         <div className="px-6 pb-1 pt-2 text-xs font-medium leading-[18px] text-text-tertiary">{t('createApp', { ns: 'app' })}</div>

web/service/use-apps.ts

@@ -12,6 +12,7 @@ import type {
 } from '@/models/app'
 import type { App, AppModeEnum } from '@/types/app'
 import {
+  keepPreviousData,
   useInfiniteQuery,
   useQuery,
   useQueryClient,
@@ -107,6 +108,7 @@ export const useInfiniteAppList = (params: AppListParams, options?: { enabled?:
     queryFn: ({ pageParam = normalizedParams.page }) => get<AppListResponse>('/apps', { params: { ...normalizedParams, page: pageParam } }),
     getNextPageParam: lastPage => lastPage.has_more ? lastPage.page + 1 : undefined,
     initialPageParam: normalizedParams.page,
+    placeholderData: keepPreviousData,
     ...options,
   })
 }