opt.: sync switch

lib/view/page/backup.dart

@@ -44,6 +44,7 @@ class BackupPage extends StatelessWidget {
     return ListView(
       padding: const EdgeInsets.all(17),
       children: [
+        _buildTip(),
         if (isMacOS || isIOS) _buildIcloud(context),
         _buildWebdav(context),
         _buildFile(context),
@@ -51,6 +52,16 @@ class BackupPage extends StatelessWidget {
     );
   }
 
+  Widget _buildTip() {
+    return CardX(
+      ListTile(
+        leading: const Icon(Icons.warning),
+        title: Text(l10n.attention),
+        subtitle: Text(l10n.backupTip, style: UIs.textGrey),
+      ),
+    );
+  }
+
   Widget _buildFile(BuildContext context) {
     return CardX(
       ExpandTile(
@@ -61,10 +72,6 @@ class BackupPage extends StatelessWidget {
           ListTile(
             title: Text(l10n.backup),
             trailing: const Icon(Icons.save),
-            subtitle: Text(
-              l10n.backupTip,
-              style: UIs.textGrey,
-            ),
             onTap: () async {
               final path = await Backup.backup();
 

lib/view/widget/store_switch.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 import '../../core/persistant_store.dart';
@@ -6,7 +8,7 @@ class StoreSwitch extends StatelessWidget {
   final StorePropertyBase<bool> prop;
 
   /// Exec before make change, after validator.
-  final void Function(bool)? callback;
+  final FutureOr<void> Function(bool)? callback;
 
   /// If return false, the switch will not change.
   final bool Function(bool)? validator;
@@ -25,9 +27,9 @@ class StoreSwitch extends StatelessWidget {
       builder: (context, bool value, widget) {
         return Switch(
           value: value,
-          onChanged: (value) {
+          onChanged: (value) async {
             if (validator != null && validator?.call(value) != true) return;
-            callback?.call(value);
+            await callback?.call(value);
             prop.put(value);
           },
         );