AnimatedContainer: generalized Container widget that handles animating values

sky/sdk/lib/widgets/animated_component.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 'dart:async';
 
-import 'package:vector_math/vector_math.dart';
-
 import '../animation/animated_value.dart';
-import '../animation/animation_performance.dart';
-import '../animation/curves.dart';
 import 'basic.dart';
 
 class _AnimationEntry {
   _AnimationEntry(this.value);
   final AnimatedValue value;
   StreamSubscription<double> subscription;
 }
 
 abstract class AnimatedComponent extends StatefulComponent {
 
@@ skipping 25 matching lines @@
   void didUnmount() {
     for (_AnimationEntry entry in _animatedFields) {
       assert(entry.subscription != null);
       entry.subscription.cancel();
       entry.subscription = null;
     }
     super.didUnmount();
   }
 
 }
-
-// Types of things that can be animated in a component. Use build() to
-// construct the final Widget based on the animation state.
-// TODO(mpcomplete): the idea here is to eventually have an AnimatedCollection
-// which assembles a container based on a list of animated things. e.g. if you
-// want to animate position, opacity, and shadow, you add those animators to an
-// AnimatedCollection and just call collection.build() to construct your
-// widget.
-
-class AnimatedPosition extends AnimatedType<Point> {
-  AnimatedPosition(Point begin, Point end, {Curve curve: linear})
-      : super(begin, end, curve: curve);
-
-  Widget build(Widget child) {
-    Matrix4 transform = new Matrix4.identity();
-    transform.translate(value.x, value.y);
-    return new Transform(transform: transform, child: child);
-  }
-}