implemented search for marianum messages with name and date filtering

lib/view/pages/marianum_message/marianum_message_list_view.dart

@@ -6,6 +6,7 @@ import '../../../state/app/infrastructure/loadable_state/view/loadable_state_con
 import '../../../state/app/infrastructure/utility_widgets/bloc_module.dart';
 import '../../../state/app/modules/marianum_message/bloc/marianum_message_bloc.dart';
 import '../../../state/app/modules/marianum_message/bloc/marianum_message_state.dart';
+import 'search_marianum_messages.dart';
 
 class MarianumMessageListView extends StatelessWidget {
   const MarianumMessageListView({super.key});
@@ -16,7 +17,25 @@ class MarianumMessageListView extends StatelessWidget {
   ) => BlocModule<MarianumMessageBloc, LoadableState<MarianumMessageState>>(
     create: (context) => MarianumMessageBloc(),
     child: (context, bloc, state) => Scaffold(
-      appBar: AppBar(title: const Text('Marianum Message')),
+      appBar: AppBar(
+        title: const Text('Marianum Message'),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.search),
+            onPressed: () {
+              final list = bloc.state.data?.messageList;
+              if (list == null) return;
+              showSearch(
+                context: context,
+                delegate: SearchMarianumMessages(
+                  base: list.base,
+                  messages: list.messages,
+                ),
+              );
+            },
+          ),
+        ],
+      ),
       body: LoadableStateConsumer<MarianumMessageBloc, MarianumMessageState>(
         child: (state, loading) => ListView.builder(
           itemCount: state.messageList.messages.length,

lib/view/pages/marianum_message/search_marianum_messages.dart

@@ -0,0 +1,66 @@
+import 'package:flutter/material.dart';
+
+import '../../../routing/app_routes.dart';
+import '../../../state/app/modules/marianum_message/bloc/marianum_message_state.dart';
+import '../../../widget/placeholder_view.dart';
+
+class SearchMarianumMessages extends SearchDelegate<MarianumMessage?> {
+  final String base;
+  final List<MarianumMessage> messages;
+
+  SearchMarianumMessages({required this.base, required this.messages});
+
+  List<MarianumMessage> _matches() {
+    final q = query.trim().toLowerCase();
+    if (q.isEmpty) return messages;
+    return messages.where((m) {
+      return m.name.toLowerCase().contains(q) ||
+          m.date.toLowerCase().contains(q);
+    }).toList();
+  }
+
+  @override
+  List<Widget>? buildActions(BuildContext context) => [
+    if (query.isNotEmpty)
+      IconButton(onPressed: () => query = '', icon: const Icon(Icons.delete)),
+  ];
+
+  @override
+  Widget? buildLeading(BuildContext context) => IconButton(
+    icon: const Icon(Icons.arrow_back),
+    onPressed: () => close(context, null),
+  );
+
+  @override
+  Widget buildResults(BuildContext context) {
+    final matches = _matches();
+    if (matches.isEmpty) {
+      return const PlaceholderView(
+        icon: Icons.search_off_outlined,
+        text: 'Keine Treffer',
+      );
+    }
+    return ListView.builder(
+      itemCount: matches.length,
+      itemBuilder: (_, i) {
+        final message = matches[i];
+        return ListTile(
+          leading: const Column(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [Icon(Icons.newspaper)],
+          ),
+          title: Text(message.name, overflow: TextOverflow.ellipsis),
+          subtitle: Text('vom ${message.date}'),
+          trailing: const Icon(Icons.arrow_right),
+          onTap: () {
+            close(context, message);
+            AppRoutes.openMarianumMessage(context, base, message);
+          },
+        );
+      },
+    );
+  }
+
+  @override
+  Widget buildSuggestions(BuildContext context) => buildResults(context);
+}