added cargo files

PinePods-0.8.2/mobile/lib/bloc/ui/pager_bloc.dart

@@ -0,0 +1,19 @@
+// Copyright 2020 Ben Hills and the project contributors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:rxdart/rxdart.dart';
+
+/// This BLoC provides a sink and stream to set and listen for the current
+/// page/tab on a bottom navigation bar.
+class PagerBloc {
+  final BehaviorSubject<int> page = BehaviorSubject<int>.seeded(0);
+
+  Function(int) get changePage => page.add;
+
+  Stream<int> get currentPage => page.stream;
+
+  void dispose() {
+    page.close();
+  }
+}