clean up

lib/pages/widgets/banner.dart

@@ -0,0 +1,30 @@
+import 'package:fcs/config.dart';
+import 'package:flutter/material.dart';
+
+class FlavorBanner extends StatelessWidget {
+  final Widget child;
+  FlavorBanner({@required this.child});
+
+  @override
+  Widget build(BuildContext context) {
+    if (Config.isProduction()) return child;
+    return Stack(
+      children: <Widget>[child, _buildBanner(context)],
+    );
+  }
+
+  Widget _buildBanner(BuildContext context) {
+    return Container(
+      width: 50,
+      height: 50,
+      child: CustomPaint(
+        painter: BannerPainter(
+            message: Config.instance.name,
+            textDirection: Directionality.of(context),
+            layoutDirection: Directionality.of(context),
+            location: BannerLocation.topStart,
+            color: Config.instance.color),
+      ),
+    );
+  }
+}