Version 0.1.0

lib/widgets/menu.dart

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+
+import '../localizations.dart';
+
+import 'menu_entry.dart';
+
+class Menu extends StatelessWidget {
+  final String title;
+  final String subtitle;
+  final List<Widget> children;
+  final bool showBackButton;
+
+  Menu({
+    this.title,
+    this.subtitle,
+    this.children,
+    this.showBackButton = false,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final localizations = ChristmasCatsLocalizations.of(context);
+
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      crossAxisAlignment: CrossAxisAlignment.center,
+      children: <Widget>[
+        if (title != null)
+          Text(
+            title,
+            style: TextStyle(
+              fontWeight: FontWeight.bold,
+              fontSize: 64.0,
+            ),
+          ),
+        if (subtitle != null)
+          Text(
+            subtitle,
+            style: TextStyle(fontSize: 32.0),
+          ),
+        SizedBox(
+          height: 16.0,
+        ),
+        ...?children,
+        if (showBackButton) ...[
+          SizedBox(
+            height: 32.0,
+          ),
+          MenuEntry(
+            text: localizations.back,
+            onTap: () => Navigator.pop(context),
+          ),
+        ],
+      ],
+    );
+  }
+}

lib/widgets/menu_entry.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+
+class MenuEntry extends StatelessWidget {
+  final String text;
+  final void Function() onTap;
+
+  MenuEntry({
+    @required this.text,
+    this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return InkWell(
+      child: Center(
+        child: Padding(
+          padding: const EdgeInsets.all(8.0),
+          child: Text(
+            text,
+            textAlign: TextAlign.center,
+            style: TextStyle(
+              fontSize: 40.0,
+              height: 1.1,
+            ),
+          ),
+        ),
+      ),
+      onTap: onTap,
+    );
+  }
+}

lib/widgets/transparent_route.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+
+// This is a modified version of MaterialPageRoute that we can't extend without
+// hitting an assertion.
+class TransparentRoute<T> extends PageRoute<T> {
+  final Widget Function(BuildContext context) builder;
+
+  MaterialPageRoute route;
+
+  TransparentRoute({
+    this.builder,
+  });
+
+  @override
+  bool get opaque => false;
+
+  @override
+  Color get barrierColor => null;
+
+  @override
+  String get barrierLabel => null;
+
+  @override
+  bool get maintainState => true;
+
+  @override
+  Duration get transitionDuration => Duration(milliseconds: 300);
+
+  @override
+  Widget buildPage(BuildContext context, Animation<double> animation,
+      Animation<double> secondaryAnimation) {
+    final result = builder(context);
+    return Semantics(
+        scopesRoute: true,
+        explicitChildNodes: true,
+        child: result,
+    );
+  }
+
+  @override
+  Widget buildTransitions(BuildContext context, Animation<double> animation, Animation<double> secondaryAnimation, Widget child) {
+    final PageTransitionsTheme theme = Theme.of(context).pageTransitionsTheme;
+    return theme.buildTransitions<T>(this, context, animation, secondaryAnimation, child);
+  }
+}