added action bar for selected bookmark item

lib/pages/collection_page.dart

@@ -9,6 +9,7 @@ import '../service/notifying.dart';
 import '../service/shared_link_provider.dart';
 import '../service/storage.dart';
 import '../service/url_launcher.dart';
+import '../widgets/collection_page_widgets/list_item_actions_widget.dart';
 import '../widgets/create_bookmark_dialog.dart';
 
 class CollectionPage extends StatefulWidget {
@@ -22,6 +23,7 @@ class CollectionPage extends StatefulWidget {
 
 class _CollectionPageState extends State<CollectionPage> {
   MapsLinkMetadata? selectedMapsLink;
+  int selectedBookmarkId = -1;
 
   @override
   void initState() {
@@ -52,29 +54,46 @@ class _CollectionPageState extends State<CollectionPage> {
         ).whenComplete(() => setState(() {}));
       },
     ),
-  );
+  ).whenComplete(deselectBookmark);
 
   void onBookmarkSaved(Bookmark bookmark) {
     Storage.addOrUpdateBookmark(bookmark);
     setState(() {});
-    context.read<SharedLinkProvider>().removeCurrentMapsLink();
+    Provider.of<SharedLinkProvider>(
+      context,
+      listen: false,
+    ).removeCurrentMapsLink();
   }
 
   Widget bookmarksListItemBuilder(BuildContext context, Bookmark bookmark) {
+    final selected = selectedBookmarkId == bookmark.id;
     return ListTile(
       title: Text(bookmark.name),
-      onTap: () => launchUrlFromString(bookmark.link).then((errorCode) {
-        if (context.mounted) {
-          return Notifying.showUrlErrorSnackbar(context, errorCode);
+      selected: selected,
+      onTap: () {
+        if (selected) {
+          onCancelSelectionPressed();
+          setState(() {});
+        } else if (selectedBookmarkId != -1 && !selected) {
+          selectedBookmarkId = bookmark.id;
+          setState(() {});
+        } else {
+          launchUrlFromString(bookmark.link).then((errorCode) {
+            if (context.mounted) {
+              return Notifying.showUrlErrorSnackbar(context, errorCode);
+            }
+          });
         }
+      },
+      onLongPress: () => setState(() {
+        selectedBookmarkId = bookmark.id;
       }),
-      onLongPress: () => editBookmark(bookmark),
     );
   }
 
   @override
   Widget build(BuildContext context) {
-    SharedLinkProvider provider = context.watch<SharedLinkProvider>();
+    SharedLinkProvider provider = Provider.of<SharedLinkProvider>(context);
     selectedMapsLink = provider.currentMapsLinkMetadata;
 
     if (BookmarksProvider.selectedCollectionId == null) {
@@ -87,36 +106,69 @@ class _CollectionPageState extends State<CollectionPage> {
       (c) => c.id == BookmarksProvider.selectedCollectionId,
     );
 
-    return Scaffold(
-      appBar: AppBar(
-        title: selectedMapsLink != null
-            ? Text(
-                AppLocalizations.of(context)!.addToCollection(collection.name),
+    return PopScope(
+      canPop: selectedBookmarkId == -1,
+      onPopInvokedWithResult: (didPop, result) {
+        if (didPop == false) deselectBookmark();
+      },
+      child: Scaffold(
+        appBar: AppBar(
+          title: selectedMapsLink != null
+              ? Text(
+                  AppLocalizations.of(
+                    context,
+                  )!.addToCollection(collection.name),
+                )
+              : Text(collection.name),
+          actions: [
+            if (selectedMapsLink != null)
+              TextButton(
+                onPressed: () => provider.removeCurrentMapsLink(),
+                child: Text(AppLocalizations.of(context)!.cancel),
+              ),
+          ],
+        ),
+        bottomNavigationBar: selectedBookmarkId > 0
+            ? ListItemActionsWidget(
+                onDeletePressed: onDeleteBookmarkPressed,
+                onCancelPressed: onCancelSelectionPressed,
+                onEditPressed: () => editBookmark(
+                  bookmarks.firstWhere(
+                    (element) => element.id == selectedBookmarkId,
+                  ),
+                ),
               )
-            : Text(collection.name),
-        actions: [
-          if (selectedMapsLink != null)
-            TextButton(
-              onPressed: () => provider.removeCurrentMapsLink(),
-              child: Text(AppLocalizations.of(context)!.cancel),
+            : null,
+        body: Center(
+          child: SizedBox(
+            width: MediaQuery.of(context).size.width * 0.9,
+            child: ListView.separated(
+              itemBuilder: (context, index) =>
+                  bookmarksListItemBuilder(context, bookmarks.elementAt(index)),
+              itemCount: bookmarks.length,
+              separatorBuilder: (context, index) => SizedBox(height: 10),
             ),
-        ],
-      ),
-      body: Center(
-        child: SizedBox(
-          width: MediaQuery.of(context).size.width * 0.9,
-          child: ListView.separated(
-            itemBuilder: (context, index) =>
-                bookmarksListItemBuilder(context, bookmarks.elementAt(index)),
-            itemCount: bookmarks.length,
-            separatorBuilder: (context, index) => SizedBox(height: 10),
           ),
         ),
-      ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: onAddButtonPressed,
-        child: Icon(selectedMapsLink != null ? Icons.save : Icons.add),
+        floatingActionButton: FloatingActionButton(
+          onPressed: onAddButtonPressed,
+          child: Icon(selectedMapsLink != null ? Icons.save : Icons.add),
+        ),
       ),
     );
   }
+
+  void onCancelSelectionPressed() => deselectBookmark();
+
+  void onDeleteBookmarkPressed() {
+    Storage.deleteBookmarkById(
+      selectedBookmarkId,
+    ).whenComplete(() => setState(() {}));
+    deselectBookmark();
+  }
+
+  void deselectBookmark() {
+    selectedBookmarkId = -1;
+    setState(() {});
+  }
 }