[Effen] Add AnimatedComponent base class

sky/framework/components/ink_well.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 '../fn.dart';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'ink_splash.dart';
 
 class InkWell extends Component {
   LinkedHashSet<SplashController> _splashes;
 
   Style style;
   String inlineStyle;
   List<Node> children;
 
   InkWell({ Object key, this.style, this.inlineStyle, this.children })
-      : super(key: key);
+      : super(key: key) {
+    onDidUnmount(() {
+      _cancelSplashes(null);
+    });
+  }
 
   Node build() {
     List<Node> childrenIncludingSplashes = [];
 
     if (_splashes != null) {
       childrenIncludingSplashes.addAll(
           _splashes.map((s) => new InkSplash(s.onStyleChanged)));
     }
 
     if (children != null)
@@ skipping 33 matching lines @@
   void _cancelSplashes(sky.Event event) {
     if (_splashes == null)
       return;
     setState(() {
       var splashes = _splashes;
       _splashes = null;
       splashes.forEach((s) { s.cancel(); });
     });
   }
 
-  void didUnmount() {
-    _cancelSplashes(null);
-  }
-
   void _splashDone(SplashController splash) {
     if (_splashes == null)
       return;
     setState(() {
       _splashes.remove(splash);
       if (_splashes.length == 0)
         _splashes = null;
     });
   }
 }