...

lib/pages/list_detail.dart

@@ -17,6 +17,7 @@ class ListDetailPage extends StatefulWidget {
 class _ListDetailPageState extends State<ListDetailPage> {
   late Future<List<Item>> _itemsFuture;
   StreamSubscription? _itemsSubscription;
+  List<Item> _items = [];
 
   @override
   void initState() {
@@ -34,7 +35,9 @@ class _ListDetailPageState extends State<ListDetailPage> {
   }
 
   void _loadItems() {
-    setState(() => _itemsFuture = apiService.getItems(widget.list.id));
+    setState(() {
+      _itemsFuture = apiService.getItems(widget.list.id);
+    });
   }
 
   Future<void> _showMembersDialog() async {
@@ -72,10 +75,16 @@ class _ListDetailPageState extends State<ListDetailPage> {
     );
     if (ok != true || ctl.text.trim().isEmpty) return;
 
+    final String newName = ctl.text.trim();
+    if (newName == item.name) return;
+
+    final String oldName = item.name;
+    setState(() => item.name = newName);
+
     try {
-      final String newName = ctl.text.trim();
       await apiService.updateItem(item.id, name: newName);
     } catch (e) {
+      setState(() => item.name = oldName);
       if (mounted) {
         ScaffoldMessenger.of(
           context,
@@ -84,7 +93,7 @@ class _ListDetailPageState extends State<ListDetailPage> {
     }
   }
 
-  Future<void> _addItem(List<Item> currentItems) async {
+  Future<void> _addItem() async {
     final TextEditingController ctl = TextEditingController();
     final bool? ok = await showDialog<bool>(
       context: context,
@@ -110,7 +119,7 @@ class _ListDetailPageState extends State<ListDetailPage> {
     if (ok != true || ctl.text.trim().isEmpty) return;
 
     try {
-      final int maxPos = currentItems.fold<int>(
+      final int maxPos = _items.fold<int>(
         -1,
         (max, item) => item.position > max ? item.position : max,
       );
@@ -125,28 +134,33 @@ class _ListDetailPageState extends State<ListDetailPage> {
   }
 
   Future<void> _deleteItem(Item item) async {
+    final int index = _items.indexOf(item);
+    setState(() => _items.remove(item));
+
     try {
       await apiService.deleteItem(item.id);
       if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('"${item.name}" gelöscht.')),
-        );
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text('"${item.name}" gelöscht.')));
       }
     } catch (e) {
+      setState(() => _items.insert(index, item));
       if (mounted) {
-        ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('Fehler beim Löschen: $e')),
-        );
+        ScaffoldMessenger.of(
+          context,
+        ).showSnackBar(SnackBar(content: Text('Fehler beim Löschen: $e')));
       }
     }
   }
 
   Future<void> _toggleItem(Item item) async {
+    final bool oldState = item.checked;
     setState(() => item.checked = !item.checked);
     try {
       await apiService.updateItem(item.id, checked: item.checked);
     } catch (e) {
-      setState(() => item.checked = !item.checked);
+      setState(() => item.checked = oldState);
       if (mounted) {
         ScaffoldMessenger.of(context).showSnackBar(
           SnackBar(content: Text('Fehler beim Aktualisieren: $e')),
@@ -178,17 +192,17 @@ class _ListDetailPageState extends State<ListDetailPage> {
             return Center(child: Text('Fehler: ${snapshot.error}'));
           }
 
-          final List<Item> items = snapshot.data ?? [];
+          _items = snapshot.data ?? [];
 
-          if (items.isEmpty) {
+          if (_items.isEmpty) {
             return const Center(
               child: Text('Füge deinen ersten Eintrag hinzu!'),
             );
           }
           return ListView.builder(
-            itemCount: items.length,
+            itemCount: _items.length,
             itemBuilder: (context, index) {
-              final Item item = items[index];
+              final Item item = _items[index];
               return ListTile(
                 leading: Checkbox(
                   value: item.checked,
@@ -197,8 +211,9 @@ class _ListDetailPageState extends State<ListDetailPage> {
                 title: Text(
                   item.name,
                   style: TextStyle(
-                    decoration:
-                        item.checked ? TextDecoration.lineThrough : null,
+                    decoration: item.checked
+                        ? TextDecoration.lineThrough
+                        : null,
                   ),
                 ),
                 trailing: Row(
@@ -220,10 +235,7 @@ class _ListDetailPageState extends State<ListDetailPage> {
         },
       ),
       floatingActionButton: FloatingActionButton(
-        onPressed: () async {
-          final currentItems = await _itemsFuture;
-          _addItem(currentItems);
-        },
+        onPressed: _addItem,
         child: const Icon(Icons.add),
       ),
     );