Adding CupertinoApp Sample templates (#60929)

dev/snippets/config/templates/README.md

@@ -66,6 +66,11 @@ follows:
   its own, just the sections for `imports`, `main`, and `preamble`. You must
   provide the `main` section in order to have a `main()`.
   
+### WidgetsApp Templates
+
+These templates create a `WidgetsApp` that encloses the snippet widget. These templates import
+the widgets library.
+
 - [`stateful_widget`](stateful_widget.tmpl) :
   The default code block will be placed as the body of the `State` object of a
   `StatefulWidget` subclass. Because the default code block is placed as the body
@@ -77,7 +82,10 @@ follows:
   `build()` method, and any state variables. It also has an `imports`
   section to import additional packages. Please only import things that are part
   of flutter or part of default dependencies for a `flutter create` project.
-  It creates a `WidgetsApp` around the child stateful widget.
+  
+- [`stateful_widget_ticker`](stateful_widget_ticker.tmpl) : Identical to the
+  `stateful_widget` template, with the addition of the `TickerProviderStateMixin`
+  class, enabling easy generation of animated samples.
 
 - [`stateless_widget`](stateless_widget.tmpl) : Identical to the
   `stateful_widget` template, except that the default code block is
@@ -85,21 +93,23 @@ follows:
   `StatelessWidget`. The `@override` before the build method is added by
   the template, so must be omitted from the sample code.
 
-- [`stateful_widget_material`](stateful_widget_material.tmpl) : Similar to
-  `stateful_widget`, except that it imports the material library, and uses
-  a `MaterialApp` instead of `WidgetsApp`.
+### MaterialApp Templates
 
-- [`stateless_widget_material`](stateless_widget_material.tmpl) : Similar to
-  `stateless_widget`, except that it imports the material library, and uses
-  a `MaterialApp` instead of `WidgetsApp`.
+These templates follow the same conventions as the `WidgetsApp` templates above, but use a
+`MaterialApp` instead. These templates import the  material library.
 
-- [`stateful_widget_scaffold`](stateful_widget_scaffold.tmpl) : Similar to
-  `stateful_widget_material`, except that it wraps the stateful widget with a
-  `Scaffold`.
+- [`stateful_widget_material`](stateful_widget_material.tmpl)
+  
+- [`stateful_widget_material_ticker`](stateful_widget_material_ticker.tmpl)
+
+- [`stateless_widget_material`](stateless_widget_material.tmpl)
+
+- [`stateful_widget_scaffold`](stateful_widget_scaffold.tmpl) : Adds a `Scaffold` widget as the home
+  of the enclosing `MaterialApp` to wrap the stateful widget snippet. The `Scaffold` widget contains
+  an `AppBar`.
 
 - [`stateful_widget_scaffold_center`](stateful_widget_scaffold_center.tmpl) : Similar to
-  `stateful_widget_scaffold`, except that it wraps the stateful widget with a
-  `Scaffold` _and_ a `Center`.
+  `stateful_widget_scaffold`, except that it wraps the stateful widget with a `Center`.
 
 - [`stateful_widget_scaffold_center_freeform_state`](stateful_widget_scaffold_center_freeform_state.tmpl) :
   Similar to `stateful_widget_scaffold_center` except that the code block has
@@ -111,6 +121,23 @@ follows:
   `Scaffold`.
 
 - [`stateless_widget_scaffold_center`](stateless_widget_scaffold_center.tmpl) : Similar to
-  `stateless_widget_scaffold`, except that it wraps the stateless widget with a
-  `Scaffold` _and_ a `Center`.
+  `stateless_widget_scaffold`, except that it wraps the stateless widget with a `Center`.
+
+### CupertinoApp Templates
+
+These templates follow the same conventions as the `WidgetsApp` templates above, but use a
+`CupertinoApp` instead. These templates import the  cupertino library.
+  
+- [`stateful_widget_cupertino`](stateful_widget_cupertino.tmpl)
+  
+- [`stateful_widget_cupertino_ticker`](stateful_widget_cupertino_ticker.tmpl)
+  
+- [`stateless_widget_cupertino`](stateless_widget_cupertino.tmpl)
+  
+- [`stateful_widget_cupertinoPageScaffold`](stateful_widget_cupertino_page_scaffold.tmpl) : Similar to
+  `stateful_widget_cupertino`, except that it wraps the stateful widget with a
+  `CupertinoPageScaffold`.
   
+- [`stateless_widget_cupertinoPageScaffold`](stateless_widget_cupertino_page_scaffold.tmpl) : Similar to
+  `stateless_widget_cupertino`, except that it wraps the stateless widget with a
+  `CupertinoPageScaffold`.

dev/snippets/config/templates/freeform.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 

dev/snippets/config/templates/stateful_widget.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/widgets.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
@@ -30,7 +30,7 @@ class MyStatefulWidget extends StatefulWidget {
   _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
 }
 
-// This is the private State class that goes with MyStatefulWidget.
+/// This is the private State class that goes with MyStatefulWidget.
 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   {{code}}
 }

dev/snippets/config/templates/stateful_widget_cupertino.tmpl

+/// Flutter code sample for {{element}}
+
+{{description}}
+
+import 'package:flutter/cupertino.dart';
+
+{{code-imports}}
+
+void main() => runApp(new MyApp());
+
+/// This is the main application widget.
+class MyApp extends StatelessWidget {
+  static const String _title = 'Flutter Code Sample';
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoApp(
+      title: _title,
+      home: MyStatefulWidget(),
+    );
+  }
+}
+
+{{code-preamble}}
+
+/// This is the stateful widget that the main application instantiates.
+class MyStatefulWidget extends StatefulWidget {
+  MyStatefulWidget({Key key}) : super(key: key);
+
+  @override
+  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
+}
+
+/// This is the private State class that goes with MyStatefulWidget.
+class _MyStatefulWidgetState extends State<MyStatefulWidget> {
+  {{code}}
+}

dev/snippets/config/templates/stateful_widget_cupertino_page_scaffold.tmpl

+/// Flutter code sample for {{element}}
+
+{{description}}
+
+import 'package:flutter/cupertino.dart';
+
+{{code-imports}}
+
+void main() => runApp(new MyApp());
+
+/// This is the main application widget.
+class MyApp extends StatelessWidget {
+  static const String _title = 'Flutter Code Sample';
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoApp(
+      title: _title,
+      home: CupertinoPageScaffold(
+        navigationBar: CupertinoNavigationBar(middle: const Text(_title)),
+        child: MyStatefulWidget(),
+      ),
+    );
+  }
+}
+
+{{code-preamble}}
+
+/// This is the stateful widget that the main application instantiates.
+class MyStatefulWidget extends StatefulWidget {
+  MyStatefulWidget({Key key}) : super(key: key);
+
+  @override
+  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
+}
+
+/// This is the private State class that goes with MyStatefulWidget.
+class _MyStatefulWidgetState extends State<MyStatefulWidget> {
+  {{code}}
+}

dev/snippets/config/templates/stateful_widget_cupertino_ticker.tmpl

+/// Flutter code sample for {{element}}
+
+{{description}}
+
+import 'package:flutter/cupertino.dart';
+
+{{code-imports}}
+
+void main() => runApp(new MyApp());
+
+/// This is the main application widget.
+class MyApp extends StatelessWidget {
+  static const String _title = 'Flutter Code Sample';
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoApp(
+      title: _title,
+      home: MyStatefulWidget(),
+    );
+  }
+}
+
+{{code-preamble}}
+
+/// This is the stateful widget that the main application instantiates.
+class MyStatefulWidget extends StatefulWidget {
+  MyStatefulWidget({Key key}) : super(key: key);
+
+  @override
+  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
+}
+
+/// This is the private State class that goes with MyStatefulWidget.
+/// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin.
+class _MyStatefulWidgetState extends State<MyStatefulWidget> with TickerProviderStateMixin {
+  {{code}}
+}

dev/snippets/config/templates/stateful_widget_material.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';
 
@@ -23,6 +23,7 @@ class MyApp extends StatelessWidget {
 
 {{code-preamble}}
 
+/// This is the stateful widget that the main application instantiates.
 class MyStatefulWidget extends StatefulWidget {
   MyStatefulWidget({Key key}) : super(key: key);
 
@@ -30,6 +31,7 @@ class MyStatefulWidget extends StatefulWidget {
   _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
 }
 
+/// This is the private State class that goes with MyStatefulWidget.
 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   {{code}}
 }

dev/snippets/config/templates/stateful_widget_material_ticker.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';
 
@@ -23,6 +23,7 @@ class MyApp extends StatelessWidget {
 
 {{code-preamble}}
 
+/// This is the stateful widget that the main application instantiates.
 class MyStatefulWidget extends StatefulWidget {
   MyStatefulWidget({Key key}) : super(key: key);
 
@@ -30,6 +31,8 @@ class MyStatefulWidget extends StatefulWidget {
   _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
 }
 
+/// This is the private State class that goes with MyStatefulWidget.
+/// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin.
 class _MyStatefulWidgetState extends State<MyStatefulWidget> with TickerProviderStateMixin {
   {{code}}
 }

dev/snippets/config/templates/stateful_widget_scaffold.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';
 
@@ -26,6 +26,7 @@ class MyApp extends StatelessWidget {
 
 {{code-preamble}}
 
+/// This is the stateful widget that the main application instantiates.
 class MyStatefulWidget extends StatefulWidget {
   MyStatefulWidget({Key key}) : super(key: key);
 
@@ -33,6 +34,7 @@ class MyStatefulWidget extends StatefulWidget {
   _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
 }
 
+/// This is the private State class that goes with MyStatefulWidget.
 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   {{code}}
 }

dev/snippets/config/templates/stateful_widget_scaffold_center.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';
 
@@ -28,6 +28,7 @@ class MyApp extends StatelessWidget {
 
 {{code-preamble}}
 
+/// This is the stateful widget that the main application instantiates.
 class MyStatefulWidget extends StatefulWidget {
   MyStatefulWidget({Key key}) : super(key: key);
 
@@ -35,6 +36,7 @@ class MyStatefulWidget extends StatefulWidget {
   _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
 }
 
+/// This is the private State class that goes with MyStatefulWidget.
 class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   {{code}}
 }

dev/snippets/config/templates/stateful_widget_scaffold_center_freeform_state.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';
 
@@ -28,6 +28,7 @@ class MyApp extends StatelessWidget {
 
 {{code-preamble}}
 
+/// This is the stateful widget that the main application instantiates.
 class MyStatefulWidget extends StatefulWidget {
   MyStatefulWidget({Key key}) : super(key: key);
 
@@ -35,4 +36,5 @@ class MyStatefulWidget extends StatefulWidget {
   _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
 }
 
+/// This is the private State class that goes with MyStatefulWidget.
 {{code}}

dev/snippets/config/templates/stateful_widget_ticker.tmpl

+/// Flutter code sample for {{element}}
+
+{{description}}
+
+import 'package:flutter/widgets.dart';
+
+{{code-imports}}
+
+void main() => runApp(new MyApp());
+
+/// This is the main application widget.
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return WidgetsApp(
+      title: 'Flutter Code Sample',
+      home: MyStatefulWidget(),
+      color: const Color(0xffffffff),
+    );
+  }
+}
+
+{{code-preamble}}
+
+/// This is the stateful widget that the main application instantiates.
+class MyStatefulWidget extends StatefulWidget {
+  MyStatefulWidget({Key key}) : super(key: key);
+
+  @override
+  _MyStatefulWidgetState createState() => _MyStatefulWidgetState();
+}
+
+/// This is the private State class that goes with MyStatefulWidget.
+/// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin.
+class _MyStatefulWidgetState extends State<MyStatefulWidget> with TickerProviderStateMixin {
+  {{code}}
+}

dev/snippets/config/templates/stateless_widget.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/widgets.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {

dev/snippets/config/templates/stateless_widget_cupertino.tmpl

+/// Flutter code sample for {{element}}
+
+{{description}}
+
+import 'package:flutter/cupertino.dart';
+
+{{code-imports}}
+
+void main() => runApp(new MyApp());
+
+/// This is the main application widget.
+class MyApp extends StatelessWidget {
+  static const String _title = 'Flutter Code Sample';
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoApp(
+      title: _title,
+      home: MyStatelessWidget(),
+    );
+  }
+}
+
+
+{{code-preamble}}
+
+/// This is the stateless widget that the main application instantiates.
+class MyStatelessWidget extends StatelessWidget {
+  MyStatelessWidget({Key key}) : super(key: key);
+
+  @override
+  {{code}}
+}

dev/snippets/config/templates/stateless_widget_cupertino_page_scaffold.tmpl

+/// Flutter code sample for {{element}}
+
+{{description}}
+
+import 'package:flutter/cupertino.dart';
+
+{{code-imports}}
+
+void main() => runApp(new MyApp());
+
+/// This is the main application widget.
+class MyApp extends StatelessWidget {
+  static const String _title = 'Flutter Code Sample';
+
+  @override
+  Widget build(BuildContext context) {
+    return CupertinoApp(
+      title: _title,
+      home: CupertinoPageScaffold(
+        navigationBar: CupertinoNavigationBar(middle: const Text(_title)),
+        body: MyStatelessWidget(),
+      ),
+    );
+  }
+}
+
+
+{{code-preamble}}
+
+/// This is the stateless widget that the main application instantiates.
+class MyStatelessWidget extends StatelessWidget {
+  MyStatelessWidget({Key key}) : super(key: key);
+
+  @override
+  {{code}}
+}

dev/snippets/config/templates/stateless_widget_material.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';
 

dev/snippets/config/templates/stateless_widget_scaffold.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';
 

dev/snippets/config/templates/stateless_widget_scaffold_center.tmpl

-// Flutter code sample for {{element}}
+/// Flutter code sample for {{element}}
 
 {{description}}
 
@@ -8,7 +8,7 @@ import 'package:flutter/material.dart';
 
 void main() => runApp(new MyApp());
 
-/// This Widget is the main application widget.
+/// This is the main application widget.
 class MyApp extends StatelessWidget {
   static const String _title = 'Flutter Code Sample';