[web] Add offline indicator to toolbar (#35368)

GitOrigin-RevId: 81127bff21afb6aadcf175ba1767a2629f01d747

services/web/frontend/js/features/ide-react/components/toolbar/offline-indicator.tsx

@@ -0,0 +1,52 @@
+import { useTranslation } from 'react-i18next'
+import MaterialIcon from '@/shared/components/material-icon'
+import OLTooltip from '@/shared/components/ol/ol-tooltip'
+import { useUnsavedDocsContext } from '@/features/ide-react/context/unsaved-docs-context'
+import { useFeatureFlag } from '@/shared/context/split-test-context'
+
+export function OfflineIndicatorContent() {
+  const { t } = useTranslation()
+  return (
+    <OLTooltip
+      id="tooltip-offline-indicator"
+      description={t('changes_saved_in_browser_sync_when_online')}
+      overlayProps={{ delay: 0, placement: 'bottom' }}
+    >
+      <div className="ide-redesign-toolbar-offline-indicator">
+        <MaterialIcon type="wifi_off" />
+        <span>{t('you_re_offline')}</span>
+      </div>
+    </OLTooltip>
+  )
+}
+
+export default function OfflineIndicator() {
+  const { t } = useTranslation()
+  const { unsavedDocs } = useUnsavedDocsContext()
+  const improvedFlakyConnections = useFeatureFlag(
+    'intermittent-connection-improvements'
+  )
+
+  if (!improvedFlakyConnections) {
+    return null
+  }
+
+  // TODO: use shared hook for this when merged
+  const MAX_UNSAVED_ALERT_SECONDS = 15
+  const isOffline = [...unsavedDocs.values()].some(
+    seconds => seconds >= MAX_UNSAVED_ALERT_SECONDS
+  )
+  return (
+    <>
+      {isOffline && <OfflineIndicatorContent />}
+      <div className="visually-hidden" role="status">
+        {isOffline && (
+          <>
+            <span>{t('you_re_offline')}</span>
+            <span>{t('changes_saved_in_browser_sync_when_online')}</span>
+          </>
+        )}
+      </div>
+    </>
+  )
+}

services/web/frontend/js/features/ide-react/components/toolbar/online-users.tsx

@@ -19,6 +19,8 @@ export const OnlineUsers = () => {
     [openDoc]
   )
 
+  if (!onlineUsersArray.length) return null
+
   return (
     <div className="ide-redesign-online-users">
       <OnlineUsersWidget onlineUsers={onlineUsersArray} goToUser={goToUser} />

services/web/frontend/js/features/ide-react/components/toolbar/toolbar.tsx

@@ -19,6 +19,7 @@ import { useFeatureFlag } from '@/shared/context/split-test-context'
 import OLIconButton from '@/shared/components/ol/ol-icon-button'
 import OLTooltip from '@/shared/components/ol/ol-tooltip'
 import SplitTestBadge from '@/shared/components/split-test-badge'
+import OfflineIndicator from './offline-indicator'
 
 const [publishModalModules] = importOverleafModules('publishModalToolbarButton')
 const SubmitProjectButton = publishModalModules?.import.default
@@ -128,15 +129,18 @@ export const Toolbar = () => {
         {showUpgradePrompt && upgradeButtonRelocation && <UpgradeButton />}
       </div>
       <ToolbarProjectTitle />
-      <div className="ide-redesign-toolbar-actions">
-        <OnlineUsers />
-        {!isRestrictedTokenMember && <ShowHistoryButton />}
-        <ChangeLayoutButton />
-        {shouldDisplaySubmitButton && cobranding && (
-          <SubmitProjectButton cobranding={cobranding} />
-        )}
-        <ShareProjectButton />
-        {showUpgradePrompt && !upgradeButtonRelocation && <UpgradeButton />}
+      <div className="ide-redesign-toolbar-actions-wrapper">
+        <OfflineIndicator />
+        <div className="ide-redesign-toolbar-actions">
+          <OnlineUsers />
+          {!isRestrictedTokenMember && <ShowHistoryButton />}
+          <ChangeLayoutButton />
+          {shouldDisplaySubmitButton && cobranding && (
+            <SubmitProjectButton cobranding={cobranding} />
+          )}
+          <ShareProjectButton />
+          {showUpgradePrompt && !upgradeButtonRelocation && <UpgradeButton />}
+        </div>
       </div>
     </nav>
   )

services/web/frontend/js/features/ide-react/components/unsaved-docs/unsaved-docs.tsx

@@ -4,10 +4,14 @@ import { UnsavedDocsAlert } from '@/features/ide-react/components/unsaved-docs/u
 import { createPortal } from 'react-dom'
 import { useGlobalAlertsContainer } from '@/features/ide-react/context/global-alerts-context'
 import { useUnsavedDocsContext } from '@/features/ide-react/context/unsaved-docs-context'
+import { useFeatureFlag } from '@/shared/context/split-test-context'
 
 export const UnsavedDocs: FC = () => {
   const { unsavedDocs, isLocked } = useUnsavedDocsContext()
   const globalAlertsContainer = useGlobalAlertsContainer()
+  const improvedFlakyConnections = useFeatureFlag(
+    'intermittent-connection-improvements'
+  )
 
   if (!globalAlertsContainer) {
     return null
@@ -18,7 +22,8 @@ export const UnsavedDocs: FC = () => {
       {isLocked &&
         createPortal(<UnsavedDocsLockedAlert />, globalAlertsContainer)}
 
-      {unsavedDocs.size > 0 &&
+      {!improvedFlakyConnections &&
+        unsavedDocs.size > 0 &&
         createPortal(
           <UnsavedDocsAlert unsavedDocs={unsavedDocs} />,
           globalAlertsContainer