add initState, rename animated_container

sky/sdk/example/stocks/lib/stock_home.dart

 // Copyright 2015 The Chromium Authors. 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:sky/editing/input.dart';
 import 'package:sky/animation/animation_performance.dart';
 import 'package:sky/widgets/animated_component.dart';
-import 'package:sky/widgets/animated_container.dart';
+import 'package:sky/widgets/animation_builder.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/drawer.dart';
 import 'package:sky/widgets/drawer_header.dart';
 import 'package:sky/widgets/floating_action_button.dart';
 import 'package:sky/widgets/icon.dart';
 import 'package:sky/widgets/icon_button.dart';
 import 'package:sky/widgets/menu_divider.dart';
 import 'package:sky/widgets/menu_item.dart';
 import 'package:sky/widgets/modal_overlay.dart';
@@ skipping 32 matching lines @@
   void syncFields(StockHome source) {
     navigator = source.navigator;
     stocks = source.stocks;
     stockMode = source.stockMode;
     modeUpdater = source.modeUpdater;
   }
 
   bool _isSearching = false;
   String _searchQuery;
 
-  AnimatedContainer _snackbarTransform;
+  AnimationBuilder _snackbarTransform;
 
   void _handleSearchBegin() {
     navigator.pushState("/search", (_) {
       setState(() {
         _isSearching = false;
         _searchQuery = null;
       });
     });
     setState(() {
       _isSearching = true;
@@ skipping 203 matching lines @@
       return null;
     return _snackbarTransform.build(
       new SnackBar(
         content: new Text("Stock purchased!"),
         actions: [new SnackBarAction(label: "UNDO", onPressed: _handleUndo)]
       ));
   }
 
   void _handleStockPurchased() {
     setState(() {
-      _snackbarTransform = new AnimatedContainer()
+      _snackbarTransform = new AnimationBuilder()
         ..position = new AnimatedType<Point>(const Point(0.0, 45.0), end: Point.origin);
       var performance = _snackbarTransform.createPerformance(
           [_snackbarTransform.position], duration: _kSnackbarSlideDuration);
       watchPerformance(performance);
       performance.play();
     });
   }
 
   Widget buildFloatingActionButton() {
     var widget = new FloatingActionButton(
@@ skipping 25 matching lines @@
         body: buildTabNavigator(),
         snackBar: buildSnackBar(),
         floatingActionButton: buildFloatingActionButton(),
         drawer: _drawerShowing ? buildDrawer() : null
       ),
     ];
     addMenuToOverlays(overlays);
     return new Stack(overlays);
   }
 }