Enhance ObjectCard and ObjectTable components with skeleton loading support

- Added an `isSkeleton` prop to ObjectCard for conditional rendering of skeleton loaders, improving user experience during data fetching.
- Updated ObjectTable to manage skeleton boundaries, allowing for dynamic loading of pages based on visibility of skeleton cards.
- Refactored scroll handling in ObjectTable to utilize IntersectionObserver for better performance and responsiveness.

src/components/Dashboard/common/ObjectCard.jsx

@@ -1,10 +1,11 @@
-import { Descriptions, Card, Flex, Divider } from 'antd'
+import { Descriptions, Card, Flex, Divider, Skeleton } from 'antd'
 import PropTypes from 'prop-types'
 import ObjectProperty from './ObjectProperty'
 import { createElement } from 'react'
 import Thumbnail from './Thumbnail'
 
 const ObjectCard = ({
+  isSkeleton = false,
   model,
   modelProperties,
   visibleColumns = {},
@@ -40,7 +41,9 @@ const ObjectCard = ({
         key: prop.name,
         label: prop.label,
         span: 2,
-        children: (
+        children: isSkeleton ? (
+          <Skeleton.Input active size='small' style={{ height: '24px' }} />
+        ) : (
           <ObjectProperty
             {...prop}
             longId={false}
@@ -162,7 +165,8 @@ ObjectCard.propTypes = {
   isEditing: PropTypes.bool,
   rowActions: PropTypes.array,
   renderActions: PropTypes.func.isRequired,
-  cardStyle: PropTypes.string
+  cardStyle: PropTypes.string,
+  isSkeleton: PropTypes.bool
 }
 
 export default ObjectCard

src/components/Dashboard/common/ObjectTable.jsx

@@ -252,7 +252,7 @@ const ObjectTable = forwardRef(
                       <QuestionCircleIcon />
                     )
                   }
-                  disabled={disabled}
+                  disabled={disabled || objectData?.isSkeleton}
                   type={'text'}
                   size={'small'}
                   onClick={() => {
@@ -304,6 +304,21 @@ const ObjectTable = forwardRef(
       return SKELETON_HEIGHT * pageSize
     }, [pageSize])
 
+    const skeletonBoundaryIds = useMemo(() => {
+      const firstPage = pages[0]
+      const lastPage = pages[pages.length - 1]
+      return {
+        previous:
+          firstPage?.isSkeletonPage && firstPage.items.length > 0
+            ? firstPage.items[firstPage.items.length - 1]._id
+            : null,
+        next:
+          lastPage?.isSkeletonPage && lastPage.items[0]
+            ? lastPage.items[0]._id
+            : null
+      }
+    }, [pages])
+
     const createPageWindow = useCallback(
       (loadedPages, direction) => {
         const sortedPages = [...loadedPages].sort(
@@ -1101,37 +1116,39 @@ const ObjectTable = forwardRef(
       return () => cardsResizeObserverRef.current?.disconnect()
     }, [])
 
-    // Card view scroll handler
+    // Card view: load when the leading skeleton card in a boundary page enters view
-    useEffect(() => {
+    useLayoutEffect(() => {
       if (!cards) return
       const container = cardsContainerNodeRef.current
       if (!container) return
       const scrollEl = container.querySelector('.simplebar-content-wrapper')
       if (!scrollEl) return
 
-      const handleCardsScroll = (e) => {
+      const observer = new IntersectionObserver(
-        const { scrollTop, scrollHeight, clientHeight } = e.target
+        (entries) => {
-        const firstPage = pagesRef.current[0]
+          for (const entry of entries) {
-        const lastPage = pagesRef.current[pagesRef.current.length - 1]
+            if (!entry.isIntersecting) continue
-
+            const boundary = entry.target.dataset.skeletonBoundary
-        if (
+            if (boundary === 'next') {
-          lastPage?.isSkeletonPage &&
+              loadNextPage(scrollEl)
-          scrollHeight - scrollTop - clientHeight < 100 &&
+            } else if (boundary === 'previous') {
-          !lazyLoading
+              loadPreviousPage(scrollEl)
-        ) {
+            }
-          loadNextPage(scrollEl)
+          }
-        } else if (
+        },
-          firstPage?.isSkeletonPage &&
+        {
-          scrollTop < 100 &&
+          root: scrollEl,
-          !lazyLoading
+          rootMargin: `${SCROLL_THRESHOLD}px`,
-        ) {
+          threshold: 0
-          loadPreviousPage(scrollEl)
         }
-      }
+      )
 
-      scrollEl.addEventListener('scroll', handleCardsScroll)
+      container
-      return () => scrollEl.removeEventListener('scroll', handleCardsScroll)
+        .querySelectorAll('[data-skeleton-boundary]')
-    }, [cards, pages, lazyLoading, loadNextPage, loadPreviousPage])
+        .forEach((el) => observer.observe(el))
+
+      return () => observer.disconnect()
+    }, [cards, skeletonBoundaryIds, loadNextPage, loadPreviousPage])
 
     const renderCards = () => {
       return (
@@ -1146,9 +1163,20 @@ const ObjectTable = forwardRef(
                 if (record?._id == undefined) {
                   return null
                 }
+
+                const skeletonBoundary =
+                  record._id === skeletonBoundaryIds.next
+                    ? 'next'
+                    : record._id === skeletonBoundaryIds.previous
+                      ? 'previous'
+                      : undefined
+
                 return (
                   <Col span={cardColSpan} key={record._id}>
-                    <div style={{ width: '100%', overflow: 'hidden' }}>
+                    <div
+                      style={{ width: '100%', overflow: 'hidden' }}
+                      data-skeleton-boundary={skeletonBoundary}
+                    >
                       <RowForm
                         record={record}
                         isEditing={isEditing}
@@ -1156,6 +1184,7 @@ const ObjectTable = forwardRef(
                       >
                         <Flex align={'center'} vertical gap={'middle'}>
                           <ObjectCard
+                            isSkeleton={record?.isSkeleton || false}
                             model={model}
                             modelProperties={modelProperties}
                             visibleColumns={visibleColumns}