Baby steps towards an odeon-like animation system. First victim: Drawer.

sky/sdk/lib/animation/generators.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 'dart:math' as math;
 
 import '../base/scheduler.dart' as scheduler;
 import 'curves.dart';
 import 'mechanics.dart';
@@ skipping 71 matching lines @@
     assert(curve != null);
     assert(duration != null && duration > 0.0);
     _generator = new FrameGenerator(onDone: onDone);
 
     double startTime = 0.0;
     _stream = _generator.onTick.map((timeStamp) {
       if (startTime == 0.0)
         startTime = timeStamp;
 
       double t = (timeStamp - (startTime + initialDelay)) / duration;
-      _lastTime = math.max(0.0, math.min(t, 1.0));
+      _lastTime = t.clamp(0.0, 1.0);
       return _lastTime;
     })
     .takeWhile(_checkForCompletion)
     .where((t) => t >= 0.0)
     .map(_transform);
   }
 
   double get remainingTime {
     if (_lastTime == null)
       return duration;
@@ skipping 50 matching lines @@
   double _update(double timeStamp) {
     double previousTime = _previousTime;
     _previousTime = timeStamp;
     if (previousTime == 0.0)
       return timeStamp;
     double deltaT = timeStamp - previousTime;
     system.update(deltaT);
     return timeStamp;
   }
 }