added cargo files

PinePods-0.8.2/mobile/lib/ui/widgets/sync_spinner.dart

@@ -0,0 +1,76 @@
+// 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 'dart:async';
+
+import 'package:pinepods_mobile/bloc/podcast/podcast_bloc.dart';
+import 'package:pinepods_mobile/state/bloc_state.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+class SyncSpinner extends StatefulWidget {
+  const SyncSpinner({super.key});
+
+  @override
+  State<SyncSpinner> createState() => _SyncSpinnerState();
+}
+
+class _SyncSpinnerState extends State<SyncSpinner> with SingleTickerProviderStateMixin {
+  late AnimationController _controller;
+  StreamSubscription<BlocState<void>>? subscription;
+  Widget? _child;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _controller = AnimationController(
+      vsync: this,
+      duration: const Duration(milliseconds: 1500),
+    )..repeat();
+
+    _child = const Icon(
+      Icons.refresh,
+      size: 16.0,
+    );
+
+    final podcastBloc = Provider.of<PodcastBloc>(context, listen: false);
+
+    subscription = podcastBloc.backgroundLoading.listen((event) {
+      if (event is BlocSuccessfulState<void> || event is BlocErrorState<void>) {
+        _controller.stop();
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    subscription?.cancel();
+
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final podcastBloc = Provider.of<PodcastBloc>(context, listen: false);
+
+    return StreamBuilder<BlocState<void>>(
+        initialData: BlocEmptyState<void>(),
+        stream: podcastBloc.backgroundLoading,
+        builder: (context, snapshot) {
+          final state = snapshot.data;
+
+          return state is BlocLoadingState<void>
+              ? RotationTransition(
+                  turns: _controller,
+                  child: _child,
+                )
+              : const SizedBox(
+                  width: 0.0,
+                  height: 0.0,
+                );
+        });
+  }
+}