added cargo files

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

@@ -0,0 +1,37 @@
+// 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:pinepods_mobile/ui/widgets/platform_progress_indicator.dart';
+import 'package:flutter/material.dart';
+
+/// This class returns a platform-specific spinning indicator after a time specified
+/// in milliseconds.
+///
+/// Defaults to 1 second. This can be used as a place holder for cached images. By
+/// delaying for several milliseconds it can reduce the occurrences of placeholders
+/// flashing on screen as the cached image is loaded. Images that take longer to fetch
+/// or process from the cache will result in a [PlatformProgressIndicator] indicator
+/// being displayed.
+class DelayedCircularProgressIndicator extends StatelessWidget {
+  final f = Future.delayed(const Duration(milliseconds: 1000), () => Container());
+
+  DelayedCircularProgressIndicator({
+    super.key,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder<Widget>(
+        future: f,
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.done) {
+            return const Center(
+              child: PlatformProgressIndicator(),
+            );
+          } else {
+            return Container();
+          }
+        });
+  }
+}