added abilty to edit and delete collections

lib/pages/collections_list_page.dart

@@ -10,6 +10,7 @@ import 'collection_page.dart';
 
 class CollectionsListPage extends StatefulWidget {
   const CollectionsListPage({super.key});
+
   static const String routeName = '/collections';
 
   @override
@@ -17,11 +18,63 @@ class CollectionsListPage extends StatefulWidget {
 }
 
 class _CollectionsListPageState extends State<CollectionsListPage> {
-  final collections = Storage.loadCollections();
   bool addingNewBookmark = false;
 
+  Widget bottomSheetBuilder(BuildContext context) {
+    final titleTextFieldController = TextEditingController(
+      text: context
+          .read<SharedLinkProvider>()
+          .currentMapsLinkMetadata!
+          .placeName,
+    );
+    return SizedBox(
+      height: 200,
+      child: TextField(controller: titleTextFieldController),
+    );
+  }
+
+  void onAddButtonPressed() => showDialog(
+    context: context,
+    builder: (context) =>
+        CreateBookmarkCollectionDialog(onSavePressed: onCollectionSaved),
+  );
+
+  void onCollectionSaved(Collection collection) {
+    Storage.addOrUpdateCollection(collection);
+    setState(() {});
+  }
+
+  Widget collectionsListItemBuilder(
+    BuildContext context,
+    Collection collection,
+  ) {
+    return ListTile(
+      title: Text(collection.name),
+      onTap: () => navigateToCollection(collection.id),
+      onLongPress: () => onEditCollection(collection),
+    );
+  }
+
+  void navigateToCollection(int collectionId) {
+    BookmarksProvider.selectedCollectionId = collectionId;
+    Navigator.pushNamed(context, CollectionPage.routeName);
+  }
+
+  void onEditCollection(Collection selectedCollection) => showDialog(
+    context: context,
+    builder: (context) => CreateBookmarkCollectionDialog(
+      selectedCollection: selectedCollection,
+      onSavePressed: onCollectionSaved,
+      onDeletePressed: () {
+        Storage.deleteCollection(selectedCollection);
+        setState(() {});
+      },
+    ),
+  );
+
   @override
   Widget build(BuildContext context) {
+    final collections = Storage.loadCollections();
     final provider = context.watch<SharedLinkProvider>();
     addingNewBookmark = provider.currentMapsLinkMetadata != null;
     return Scaffold(
@@ -40,58 +93,10 @@ class _CollectionsListPageState extends State<CollectionsListPage> {
         child: Icon(Icons.add),
       ),
       body: ListView.builder(
-        itemBuilder: itemBuilder,
+        itemBuilder: (context, index) =>
+            collectionsListItemBuilder(context, collections.elementAt(index)),
         itemCount: collections.length,
       ),
-      // bottomSheet: provider.currentMapsLinkMetadata == null
-      //     ? null
-      //     : BottomSheet(onClosing: () {}, builder: bottomSheetBuilder),
     );
   }
-
-  Widget bottomSheetBuilder(BuildContext context) {
-    final titleTextFieldController = TextEditingController(
-      text: context
-          .read<SharedLinkProvider>()
-          .currentMapsLinkMetadata!
-          .placeName,
-    );
-    return SizedBox(
-      height: 200,
-      child: TextField(controller: titleTextFieldController),
-    );
-  }
-
-  void onAddButtonPressed() =>
-      showDialog(
-        context: context,
-        builder: (context) =>
-            CreateBookmarkCollectionDialog(onSavePressed: onCollectionSaved),
-      ).whenComplete(() {
-        if (addingNewBookmark) navigateToCollection(collections.last.id);
-      });
-
-  void onCollectionSaved(String name) {
-    collections.add(Collection(name: name));
-    Storage.saveCollections(collections);
-    setState(() {});
-  }
-
-  Widget itemBuilder(BuildContext context, int index) {
-    final collection = collections.elementAt(index);
-    return ListTile(
-      title: Text(collection.name),
-      onTap: () => navigateToCollection(collection.id),
-    );
-  }
-
-  void navigateToCollection(int collectionId) {
-    BookmarksProvider.selectedCollectionId = collectionId;
-    Navigator.pushNamed(context, CollectionPage.routeName);
-  }
-
-  @override
-  void didChangeDependencies() {
-    super.didChangeDependencies();
-  }
 }