Move animationgenerator.dart to sky/framework/animation/generator.dart

sky/framework/animation/generator.dart

-part of widgets;
+// 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 'curves.dart';
+import 'dart:async';
+import 'dart:math' as math;
+import 'dart:sky' as sky;
 
 class FrameGenerator {
-
   Function onDone;
   StreamController _controller;
 
   Stream<double> get onTick => _controller.stream;
 
   int _animationId = 0;
   bool _cancelled = false;
 
   FrameGenerator({this.onDone}) {
     _controller = new StreamController(
@@ skipping 24 matching lines @@
   void _tick(double timeStamp) {
     _animationId = 0;
     _controller.add(timeStamp);
     if (!_cancelled) {
       _scheduleTick();
     }
   }
 }
 
 class AnimationGenerator extends FrameGenerator {
-
   Stream<double> get onTick => _stream;
   final double duration;
   final double begin;
   final double end;
   final Curve curve;
   Stream<double> _stream;
   bool _done = false;
 
   AnimationGenerator(this.duration, {
     this.begin: 0.0,
@@ skipping 14 matching lines @@
     .map((t) =>  begin + (end - begin) * curve.transform(t));
   }
 
   bool _checkForCompletion(double t) {
     if (_done)
       return false;
     _done = t >= 1;
     return true;
   }
 }