address code review comments

animations/README.md

@@ -1,12 +1,31 @@
 # Animation Samples
 Sample apps that showcasing Flutter's animation features
 
-## Basics
+## Goals
+
+- Demonstrate the building blocks for animations and how they work together
+- Provide samples for common patterns and use-cases
+
+## Samples
+
+### Basics
+
+Building blocks and patterns
+
 **AnimationControllerDemo**
 Demonstrates how to use an `AnimationController`.
 
+### Misc
+
+Other uses-cases and examples
 
-## Misc
+**ExpandCardDemo**
-**ExpandCard**
 Demonstrates how to use `AnimatedCrossFade` to fade between two widgets and
 change the size.
+
+## Other Resources
+
+- [Introduction to animations](https://flutter.dev/docs/development/ui/animations)
+- [Animation widgets](https://flutter.dev/docs/development/ui/widgets/animation)
+- [Flutter cookbook - Animations](https://flutter.dev/docs/cookbook/animation)
+- [Animations tutorial](https://flutter.dev/docs/development/ui/animations/tutorial)

animations/lib/main.dart

@@ -2,40 +2,39 @@ import 'package:flutter/material.dart';
 import 'src/basics/animation_controller_demo.dart';
 import 'src/misc/expand_card.dart';
 
-void main() => runApp(AnimationsSamples());
+void main() => runApp(AnimationSamples());
 
 class Demo {
   final String name;
   final String route;
   final WidgetBuilder builder;
 
-  Demo(this.name, this.route, this.builder);
+  const Demo(this.name, this.route, this.builder);
 }
 
-List<Demo> basicDemos = [
+final basicDemos = [
   Demo('Animation Controller', AnimationControllerDemo.routeName,
       (context) => AnimationControllerDemo()),
 ];
 
-List<Demo> miscDemos = [
+final miscDemos = [
   Demo('Expandable Card', ExpandCardDemo.routeName,
       (context) => ExpandCardDemo()),
 ];
 
-Map<String, WidgetBuilder> basicDemoRoutes = Map.fromEntries(
+final basicDemoRoutes =
-    basicDemos.map((d) => MapEntry(d.route, d.builder)));
+    Map.fromEntries(basicDemos.map((d) => MapEntry(d.route, d.builder)));
 
-Map<String, WidgetBuilder> miscDemoRoutes = Map.fromEntries(
+final miscDemoRoutes =
-    miscDemos.map((d) => MapEntry(d.route, d.builder)));
+    Map.fromEntries(miscDemos.map((d) => MapEntry(d.route, d.builder)));
 
-Map<String, WidgetBuilder> allRoutes = <String, WidgetBuilder>{
+final allRoutes = <String, WidgetBuilder>{
   ...basicDemoRoutes,
   ...miscDemoRoutes,
 };
 
-class AnimationsSamples extends StatelessWidget {
+class AnimationSamples extends StatelessWidget {
   Widget build(BuildContext context) {
-
     return MaterialApp(
       title: 'Animations Samples',
       theme: ThemeData(
@@ -48,19 +47,19 @@ class AnimationsSamples extends StatelessWidget {
 }
 
 class HomePage extends StatelessWidget {
-  final TextStyle _headerStyle =
-      TextStyle(fontWeight: FontWeight.bold, fontSize: 24);
 
   Widget build(BuildContext context) {
+    final headerStyle =
+    Theme.of(context).textTheme.title;
     return Scaffold(
       appBar: AppBar(
         title: Text('Animation Examples'),
       ),
       body: ListView(
-        children: <Widget>[
+        children: [
-          ListTile(title: Text('Basics', style: _headerStyle)),
+          ListTile(title: Text('Basics', style: headerStyle)),
           ...basicDemos.map((d) => DemoTile(d)),
-          ListTile(title: Text('Misc', style: _headerStyle)),
+          ListTile(title: Text('Misc', style: headerStyle)),
           ...miscDemos.map((d) => DemoTile(d)),
         ],
       ),

animations/lib/src/basics/animation_controller_demo.dart

@@ -33,18 +33,16 @@ class _AnimationControllerDemoState extends State<AnimationControllerDemo>
       body: Center(
         child: Column(
           mainAxisSize: MainAxisSize.min,
-          children: <Widget>[
+          children: [
             ConstrainedBox(
               constraints: BoxConstraints(maxWidth: 200),
-              child: Text('${controller.value.toStringAsFixed(2)}',
-                  style: TextStyle(fontSize: 24)),
-            ),
-            MaterialButton(
-              color: Theme.of(context).primaryColor,
               child: Text(
-                'animate',
+                '${controller.value.toStringAsFixed(2)}',
-                style: TextStyle(color: Colors.white),
+                style: Theme.of(context).textTheme.display3,
               ),
+            ),
+            RaisedButton(
+              child: Text('animate'),
               onPressed: () {
                 if (controller.status == AnimationStatus.completed) {
                   controller.reverse();

animations/lib/src/misc/expand_card.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 class ExpandCardDemo extends StatelessWidget {
-  static String routeName = '/expand_card';
+  static const String routeName = '/expand_card';
 
   Widget build(BuildContext context) {
     return Scaffold(
@@ -24,10 +24,6 @@ class _ExpandCardState extends State<ExpandCard>
 
   double get size => expanded ? 200 : 100;
 
-  void initState() {
-    super.initState();
-  }
-
   void toggleExpanded() {
     setState(() {
       expanded = !expanded;