[Gallery] Fix directory structure (#312)

gallery/lib/studies/rally/formatters.dart

@@ -0,0 +1,44 @@
+// Copyright 2019 The Flutter team. 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:flutter/material.dart';
+import 'package:gallery/data/gallery_options.dart';
+import 'package:intl/intl.dart';
+
+/// Get the locale string for the context.
+String locale(BuildContext context) =>
+    GalleryOptions.of(context).locale.toString();
+
+/// Currency formatter for USD.
+NumberFormat usdWithSignFormat(BuildContext context, {int decimalDigits = 2}) {
+  return NumberFormat.currency(
+    locale: locale(context),
+    name: '\$',
+    decimalDigits: decimalDigits,
+  );
+}
+
+/// Percent formatter with two decimal points.
+NumberFormat percentFormat(BuildContext context, {int decimalDigits = 2}) {
+  return NumberFormat.decimalPercentPattern(
+    locale: locale(context),
+    decimalDigits: decimalDigits,
+  );
+}
+
+/// Date formatter with year / number month / day.
+DateFormat shortDateFormat(BuildContext context) =>
+    DateFormat.yMd(locale(context));
+
+/// Date formatter with year / month / day.
+DateFormat longDateFormat(BuildContext context) =>
+    DateFormat.yMMMMd(locale(context));
+
+/// Date formatter with abbreviated month and day.
+DateFormat dateFormatAbbreviatedMonthDay(BuildContext context) =>
+    DateFormat.MMMd(locale(context));
+
+/// Date formatter with year and abbreviated month.
+DateFormat dateFormatMonthYear(BuildContext context) =>
+    DateFormat.yMMM(locale(context));