Organize sky/framework/animation

sky/framework/components/scrollable.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 '../animation/curves.dart';
 import '../animation/fling_curve.dart';
-import '../animation/generator.dart';
-import '../animation/scroll_curve.dart';
+import '../animation/generators.dart';
+import '../animation/scroll_behavior.dart';
 import '../animation/mechanics.dart';
-import '../animation/simulation.dart';
 import '../fn.dart';
 import 'dart:sky' as sky;
 
 abstract class Scrollable extends Component {
-  ScrollCurve scrollCurve;
+  ScrollBehavior scrollBehavior;
   double get scrollOffset => _scrollOffset;
 
   double _scrollOffset = 0.0;
   FlingCurve _flingCurve;
   int _flingAnimationId;
   Simulation _simulation;
 
-  Scrollable({Object key, this.scrollCurve}) : super(key: key) {
+  Scrollable({Object key, this.scrollBehavior}) : super(key: key) {
     events.listen('pointerdown', _handlePointerDown);
     events.listen('pointerup', _handlePointerUpOrCancel);
     events.listen('pointercancel', _handlePointerUpOrCancel);
     events.listen('gestureflingstart', _handleFlingStart);
     events.listen('gestureflingcancel', _handleFlingCancel);
     events.listen('gesturescrollupdate', _handleScrollUpdate);
     events.listen('wheel', _handleWheel);
   }
 
   void didUnmount() {
     super.didUnmount();
     _stopFling();
     _stopSimulation();
   }
 
   bool scrollBy(double scrollDelta) {
-    var newScrollOffset = scrollCurve.apply(_scrollOffset, scrollDelta);
+    var newScrollOffset = scrollBehavior.applyCurve(_scrollOffset, scrollDelta);
     if (newScrollOffset == _scrollOffset)
       return false;
     setState(() {
       _scrollOffset = newScrollOffset;
     });
     return true;
   }
 
   void _scheduleFlingUpdate() {
     _flingAnimationId = sky.window.requestAnimationFrame(_updateFling);
@@ skipping 17 matching lines @@
   void _updateFling(double timeStamp) {
     double scrollDelta = _flingCurve.update(timeStamp);
     if (!scrollBy(scrollDelta))
       return _settle();
     _scheduleFlingUpdate();
   }
 
   void _settle() {
     _stopFling();
     Particle particle = new Particle(position: scrollOffset);
-    _simulation = scrollCurve.release(particle);
+    _simulation = scrollBehavior.release(particle);
     if (_simulation == null)
       return;
     _simulation.onTick.listen((_) {
       setState(() {
         _scrollOffset = particle.position;
       });
     });
   }
 
   void _handlePointerDown(_) {
@@ skipping 17 matching lines @@
   }
 
   void _handleFlingCancel(sky.GestureEvent event) {
     _settle();
   }
 
   void _handleWheel(sky.WheelEvent event) {
     scrollBy(-event.offsetY);
   }
 }