[Gallery] Fix directory structure (#312)

gallery/lib/studies/rally/tabs/settings.dart

@@ -0,0 +1,54 @@
+// 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/layout/adaptive.dart';
+import 'package:gallery/studies/rally/data.dart';
+import 'package:gallery/studies/rally/login.dart';
+
+class SettingsView extends StatefulWidget {
+  @override
+  _SettingsViewState createState() => _SettingsViewState();
+}
+
+class _SettingsViewState extends State<SettingsView> {
+  @override
+  Widget build(BuildContext context) {
+    final items = DummyDataService.getSettingsTitles(context)
+        .map((title) => _SettingsItem(title))
+        .toList();
+    return Container(
+      padding: EdgeInsets.only(top: isDisplayDesktop(context) ? 24 : 0),
+      child: ListView(
+        shrinkWrap: true,
+        children: items,
+      ),
+    );
+  }
+}
+
+class _SettingsItem extends StatelessWidget {
+  const _SettingsItem(this.title);
+
+  final String title;
+
+  @override
+  Widget build(BuildContext context) {
+    return FlatButton(
+      textColor: Colors.white,
+      child: Container(
+        alignment: AlignmentDirectional.centerStart,
+        padding: EdgeInsets.symmetric(vertical: 24, horizontal: 12),
+        child: Text(title),
+      ),
+      onPressed: () {
+        Navigator.push<void>(
+          context,
+          MaterialPageRoute<void>(builder: (context) => LoginPage()),
+        );
+      },
+    );
+  }
+}