Move load indicator to app bar in home pages

app/lib/widget/app_bar_circular_progress_indicator.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/material.dart';
+
+class AppBarCircularProgressIndicator extends StatelessWidget {
+  const AppBarCircularProgressIndicator({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Center(
+      child: SizedBox.square(
+        dimension: 24,
+        child: CircularProgressIndicator(
+          strokeWidth: 2,
+        ),
+      ),
+    );
+  }
+}

app/lib/widget/home_albums.dart

@@ -140,12 +140,7 @@ class _HomeAlbumsState extends State<HomeAlbums>
         ),
         Align(
           alignment: Alignment.bottomCenter,
-          child: Column(
-            mainAxisSize: MainAxisSize.min,
-            children: [
-              if (state is ListAlbumBlocLoading)
-                const LinearProgressIndicator(),
-              SizedBox(
+          child: SizedBox(
             width: double.infinity,
             height: _calcBottomAppBarExtent(context),
             child: ClipRect(
@@ -157,8 +152,6 @@ class _HomeAlbumsState extends State<HomeAlbums>
               ),
             ),
           ),
-            ],
-          ),
         ),
       ],
     );
@@ -193,8 +186,14 @@ class _HomeAlbumsState extends State<HomeAlbums>
   }
 
   Widget _buildNormalAppBar(BuildContext context) {
+    return BlocBuilder(
+      bloc: _bloc,
+      buildWhen: (previous, current) =>
+          previous is ListAlbumBlocLoading != current is ListAlbumBlocLoading,
+      builder: (context, state) {
         return HomeSliverAppBar(
           account: widget.account,
+          isShowProgressIcon: state is ListAlbumBlocLoading,
           menuActions: [
             PopupMenuItem(
               value: _menuValueSort,
@@ -217,6 +216,8 @@ class _HomeAlbumsState extends State<HomeAlbums>
             }
           },
         );
+      },
+    );
   }
 
   SelectableItem _buildArchiveItem(BuildContext context) {

app/lib/widget/home_app_bar.dart

@@ -9,6 +9,7 @@ import 'package:nc_photos/pref.dart';
 import 'package:nc_photos/theme.dart';
 import 'package:nc_photos/url_launcher_util.dart';
 import 'package:nc_photos/widget/account_picker_dialog.dart';
+import 'package:nc_photos/widget/app_bar_circular_progress_indicator.dart';
 import 'package:nc_photos/widget/app_bar_title_container.dart';
 import 'package:nc_photos/widget/settings.dart';
 
@@ -20,6 +21,7 @@ class HomeSliverAppBar extends StatelessWidget {
     this.actions,
     this.menuActions,
     this.onSelectedMenuActions,
+    this.isShowProgressIcon = false,
   }) : super(key: key);
 
   @override
@@ -38,7 +40,9 @@ class HomeSliverAppBar extends StatelessWidget {
         child: AppBarTitleContainer(
           title: Text(accountLabel ?? account.address),
           subtitle: accountLabel == null ? Text(account.username2) : null,
-          icon: account.scheme == "http"
+          icon: isShowProgressIcon
+              ? const AppBarCircularProgressIndicator()
+              : (account.scheme == "http"
                   ? Icon(
                       Icons.no_encryption_outlined,
                       color: Theme.of(context).colorScheme.error,
@@ -46,7 +50,7 @@ class HomeSliverAppBar extends StatelessWidget {
                   : Icon(
                       Icons.https,
                       color: Theme.of(context).colorScheme.primary,
-                ),
+                    )),
         ),
       ),
       floating: true,
@@ -103,6 +107,7 @@ class HomeSliverAppBar extends StatelessWidget {
   /// much >= 0
   final List<PopupMenuEntry<int>>? menuActions;
   final void Function(int)? onSelectedMenuActions;
+  final bool isShowProgressIcon;
 
   static const _menuValueAbout = -1;
   static const _menuValueHelp = -2;

app/lib/widget/home_photos.dart

@@ -205,13 +205,7 @@ class _HomePhotosState extends State<HomePhotos>
           ),
           Align(
             alignment: Alignment.bottomCenter,
-            child: Column(
-              mainAxisSize: MainAxisSize.min,
-              children: [
-                if (state is ScanAccountDirBlocLoading ||
-                    _buildItemQueue.isProcessing)
-                  const LinearProgressIndicator(),
-                SizedBox(
+            child: SizedBox(
               width: double.infinity,
               height: _calcBottomAppBarExtent(context),
               child: ClipRect(
@@ -223,8 +217,6 @@ class _HomePhotosState extends State<HomePhotos>
                 ),
               ),
             ),
-              ],
-            ),
           ),
         ],
       );
@@ -287,8 +279,17 @@ class _HomePhotosState extends State<HomePhotos>
   }
 
   Widget _buildNormalAppBar(BuildContext context) {
+    return BlocBuilder(
+      bloc: _bloc,
+      buildWhen: (previous, current) =>
+          previous is ScanAccountDirBlocLoading !=
+          current is ScanAccountDirBlocLoading,
+      builder: (context, state) {
         return HomeSliverAppBar(
           account: widget.account,
+          isShowProgressIcon: (state is ScanAccountDirBlocLoading ||
+                  _buildItemQueue.isProcessing) &&
+              !_isRefreshIndicatorActive,
           actions: [
             ZoomMenuButton(
               initialZoom: _thumbZoomLevel,
@@ -314,6 +315,8 @@ class _HomePhotosState extends State<HomePhotos>
             }
           },
         );
+      },
+    );
   }
 
   Widget _buildSmartAlbumList(BuildContext context) {
@@ -625,12 +628,26 @@ class _HomePhotosState extends State<HomePhotos>
   }
 
   Future<void> _waitRefresh() async {
+    setState(() {
+      _isRefreshIndicatorActive = true;
+    });
+    try {
       while (true) {
         await Future.delayed(const Duration(seconds: 1));
         if (_bloc.state is! ScanAccountDirBlocLoading) {
           return;
         }
       }
+    } finally {
+      // To prevent the app bar icon appearing for a very short while
+      unawaited(Future.delayed(const Duration(seconds: 2)).then((_) {
+        if (mounted) {
+          setState(() {
+            _isRefreshIndicatorActive = false;
+          });
+        }
+      }));
+    }
   }
 
   void _setThumbZoomLevel(int level) {
@@ -745,6 +762,7 @@ class _HomePhotosState extends State<HomePhotos>
   late final _Web? _web = platform_k.isWeb ? _Web(this) : null;
 
   var _isScrollbarVisible = false;
+  var _isRefreshIndicatorActive = false;
 
   static final _log = Logger("widget.home_photos._HomePhotosState");
   static const _menuValueRefresh = 0;