code

src/flutter/lib/Components/SyncIcon.dart

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+import 'dart:math';
+import 'package:flutter/material.dart';
+import 'package:flutter/animation.dart';
+
+class SyncIcon extends StatefulWidget {
+  _SyncIcon createState() => _SyncIcon();
+}
+
+class _SyncIcon extends State<SyncIcon> with SingleTickerProviderStateMixin {
+  Animation<double> animation;
+  AnimationController controller;
+
+  initState() {
+    super.initState();
+    controller = AnimationController(
+        duration: const Duration(milliseconds: 2000), vsync: this);
+    animation = Tween(begin: 0.0, end: pi * 2).animate(controller);
+    animation.addListener(() => setState(() {}));
+    controller.repeat();
+  }
+
+  Widget build(BuildContext context) {
+    return Transform.rotate(
+        angle: animation.value,
+        child: Container(
+          margin: EdgeInsets.symmetric(vertical: 10.0),
+          height: 32.0,
+          width: 32.0,
+          child: Image.asset('images/sync.png'),
+        ));
+  }
+
+  dispose() {
+    controller.dispose();
+    super.dispose();
+  }
+}