added simple search feature

lib/pages/collections_list_page.dart

@@ -7,6 +7,7 @@ import '../service/shared_link_provider.dart';
 import '../service/storage.dart';
 import '../widgets/create_bookmark_collection_dialog.dart';
 import 'collection_page.dart';
+import 'search_page.dart' show SearchPage;
 
 class CollectionsListPage extends StatefulWidget {
   const CollectionsListPage({super.key});
@@ -88,6 +89,12 @@ class _CollectionsListPageState extends State<CollectionsListPage> {
             TextButton(
               onPressed: () => provider.removeCurrentMapsLink(),
               child: Text('Cancel'),
+            )
+          else
+            IconButton(
+              onPressed: () =>
+                  Navigator.of(context).pushNamed(SearchPage.routeName),
+              icon: Icon(Icons.search),
             ),
         ],
       ),

lib/pages/search_page.dart

@@ -1,11 +1,43 @@
 import 'package:flutter/material.dart';
 
-class SearchPage extends StatelessWidget {
+import '../model/bookmark.dart';
+import '../service/storage.dart';
+import '../widgets/search_widgets/search_bar_widget.dart';
+import '../widgets/search_widgets/search_results_widget.dart';
+
+class SearchPage extends StatefulWidget {
   const SearchPage({super.key});
+
   static const String routeName = '/search';
 
+  @override
+  State<SearchPage> createState() => _SearchPageState();
+}
+
+class _SearchPageState extends State<SearchPage> {
+  final List<Bookmark> allBookmarks = Storage.loadBookmarks();
+  String searchString = '';
+
   @override
   Widget build(BuildContext context) {
-    return const Placeholder();
+    return Scaffold(
+      appBar: AppBar(title: Text('Search')),
+      body: Column(
+        children: [
+          SearchBarWidget(
+            onEditingComplete: (searchString) => setState(() {
+              this.searchString = searchString;
+            }),
+          ),
+          Expanded(
+            child: SearchResultsWidget(
+              bookmarks: allBookmarks.where(
+                (bookmark) => bookmark.name.contains(searchString),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
   }
 }

lib/widgets/search_widgets/search_bar_widget.dart

@@ -0,0 +1,16 @@
+import 'package:flutter/material.dart';
+
+class SearchBarWidget extends StatelessWidget {
+  const SearchBarWidget({super.key, required this.onEditingComplete});
+
+  final Function(String searchString) onEditingComplete;
+
+  @override
+  Widget build(BuildContext context) {
+    TextEditingController searchBarController = TextEditingController();
+    return TextField(
+      controller: searchBarController,
+      onEditingComplete: () => onEditingComplete(searchBarController.text),
+    );
+  }
+}

lib/widgets/search_widgets/search_results_widget.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+
+import '../../model/bookmark.dart';
+import '../../service/notifying.dart';
+import '../../service/url_launcher.dart';
+
+class SearchResultsWidget extends StatelessWidget {
+  const SearchResultsWidget({super.key, required this.bookmarks});
+
+  final Iterable<Bookmark> bookmarks;
+
+  Widget bookmarkListItemBuilder(BuildContext context, int index) {
+    final bookmark = bookmarks.elementAt(index);
+    return ListTile(
+      title: Text(bookmark.name),
+      onTap: () => launchUrlFromString(bookmark.link).then((errorCode) {
+        if (context.mounted && errorCode != UrlLaunchErrorCode.none) {
+          Notifying.showUrlErrorSnackbar(context, errorCode);
+        } else if (context.mounted) {
+          Navigator.of(context).pop();
+        }
+      }),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (bookmarks.isNotEmpty) {
+      return ListView.builder(
+        itemBuilder: bookmarkListItemBuilder,
+        itemCount: bookmarks.length,
+      );
+    }
+    return Center(child: Text('Start searching'));
+  }
+}