[Gallery] Fix directory structure (#312)

gallery/lib/studies/shrine/home.dart

@@ -0,0 +1,74 @@
+// 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:flutter/semantics.dart';
+import 'package:gallery/data/gallery_options.dart';
+import 'package:gallery/layout/adaptive.dart';
+import 'package:gallery/studies/shrine/expanding_bottom_sheet.dart';
+import 'package:gallery/studies/shrine/model/app_state_model.dart';
+import 'package:gallery/studies/shrine/supplemental/asymmetric_view.dart';
+import 'package:scoped_model/scoped_model.dart';
+
+const _ordinalSortKeyName = 'home';
+
+class ProductPage extends StatelessWidget {
+  const ProductPage();
+
+  @override
+  Widget build(BuildContext context) {
+    final bool isDesktop = isDisplayDesktop(context);
+
+    return ScopedModelDescendant<AppStateModel>(
+        builder: (context, child, model) {
+      return isDesktop
+          ? DesktopAsymmetricView(products: model.getProducts())
+          : MobileAsymmetricView(products: model.getProducts());
+    });
+  }
+}
+
+class HomePage extends StatelessWidget {
+  const HomePage({
+    this.expandingBottomSheet,
+    this.scrim,
+    this.backdrop,
+    Key key,
+  }) : super(key: key);
+
+  final ExpandingBottomSheet expandingBottomSheet;
+  final Widget scrim;
+  final Widget backdrop;
+
+  @override
+  Widget build(BuildContext context) {
+    final bool isDesktop = isDisplayDesktop(context);
+
+    // Use sort keys to make sure the cart button is always on the top.
+    // This way, a11y users do not have to scroll through the entire list to
+    // find the cart, and can easily get to the cart from anywhere on the page.
+    return ApplyTextOptions(
+      child: Stack(
+        children: [
+          Semantics(
+            container: true,
+            child: backdrop,
+            sortKey: OrdinalSortKey(1, name: _ordinalSortKeyName),
+          ),
+          ExcludeSemantics(child: scrim),
+          Align(
+            child: Semantics(
+              container: true,
+              child: expandingBottomSheet,
+              sortKey: OrdinalSortKey(0, name: _ordinalSortKeyName),
+            ),
+            alignment: isDesktop
+                ? AlignmentDirectional.topEnd
+                : AlignmentDirectional.bottomEnd,
+          ),
+        ],
+      ),
+    );
+  }
+}