Merge pull request #1076 from abarth/docs_animation

Introduce package:sky/animation.dart

examples/fitness/lib/main.dart

@@ -5,6 +5,7 @@
 library fitness;
 
 import 'package:playfair/playfair.dart' as playfair;
+import 'package:sky/animation.dart';
 import 'package:sky/painting/text_style.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/widgets.dart';

examples/rendering/spinning_flex.dart

@@ -4,7 +4,7 @@
 
 import 'dart:sky' as sky;
 
-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/animation.dart';
 import 'package:sky/rendering.dart';
 
 import 'solid_color_box.dart';

examples/stocks/lib/main.dart

@@ -9,6 +9,7 @@ import 'dart:sky' as sky;
 
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/typography.dart' as typography;
+import 'package:sky/animation.dart';
 import 'package:sky/widgets.dart';
 
 import 'stock_data.dart';

examples/widgets/card_collection.dart

@@ -4,6 +4,7 @@
 
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/typography.dart' as typography;
+import 'package:sky/animation.dart';
 import 'package:sky/widgets.dart';
 
 class CardModel {

examples/widgets/pageable_list.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:sky/theme/colors.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/widgets.dart';
 
 class CardModel {

examples/widgets/progress_indicator.dart

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/widgets.dart';
 

examples/widgets/spinning_mixed.dart

@@ -4,7 +4,7 @@
 
 import 'dart:sky' as sky;
 
-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/animation.dart';
 import 'package:sky/rendering.dart';
 import 'package:sky/widgets.dart';
 

sky/packages/sky/lib/README.md

@@ -5,31 +5,30 @@ Sky and Sky's SDK are designed as layered frameworks, where each layer
 depends on the ones below it but could be replaced wholesale.
 
 The bottom-most layer is the Sky Platform, which is exposed to Dart
-code as [various ```dart:``` packages](https://api.dartlang.org/),
-including ```dart:sky```.
+code as [various `dart:` packages](https://api.dartlang.org/),
+including `dart:sky`.
 
 The [base/](base/) directory contains libraries that extend these core
 APIs to provide base classes for tree structures
 ([base/node.dart](base/node.dart)), hit testing
-([base/hit_test.dart](base/hit_test.dart)), debugging
-([base/debug.dart](base/debug.dart)), and task scheduling
-([base/scheduler.dart](base/scheduler.dart)).
+([base/hit_test.dart](base/hit_test.dart)), and debugging
+([base/debug.dart](base/debug.dart)).
 
-Above this are the files in the [animation/](animation/) directory,
-which provide core primitives for animating values, and in the [gestures/](gestures/)
+Above this layer is the [animation](animation.dart) library,
+which provides core animation primitives, and the [gestures/](gestures/)
 directory, which define a gesture recognition and disambiguation system.
 
 The next layer consists of the files in the [painting/](painting/) directory,
 which provide APIs related to drawing graphics. Some of the code here
-uses the [animation/](animation/) utilities mentioned above.
+uses the [animation](animation.dart) utilities mentioned above.
 
 Layout primitives are provided in the next layer, found in the
-[rendering/](rendering/) directory. They use ```dart:sky``` and the
-APIs exposed in painting/ to provide a retained-mode layout and
+[rendering](rendering.dart) library. They use `dart:sky` and the
+APIs exposed in [painting/](painting/) to provide a retained-mode layout and
 rendering model for applications or documents.
 
-Widgets are provided by the files in the [widgets/](widgets/)
-directory, using a reactive framework. They use data given in the
+Widgets are provided by the files in the [widgets](widgets.dart)
+library, using a reactive framework. They use data given in the
 [theme/](theme/) directory to select styles consistent with Material
 Design.
 
@@ -38,18 +37,18 @@ anything that uses the Mojo IPC mechanism, typically as part of
 wrapping host operating system features. Some of those Host APIs are
 implemented in the host system's preferred language.
 
-Here is a diagram summarising all this:
+Here is a diagram summarizing all this:
 
     +-----------------------------+ ------
     |           YOUR APP          |
     |  +----------------------+---+
-    |  |  widgets/  (theme/)  |   |
+    |  |  widgets   (theme/)  |   |
     | ++---------------------++   |
-    | |      rendering/      |    |  Dart
+    | |      rendering       |    |  Dart
     | |---------+------------+    |
     | |         | painting/  |    |
     +-+         +------------+    |
-    | gestures/ | animation/ |    |
+    | gestures/ | animation  |    |
     +-----------+---+--------+    |
     |    base/      |  mojo/      |
     +------------+--+-+----+------+ -------

sky/packages/sky/lib/animation.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.
+
+/// The Sky animation engine.
+///
+/// This library includes and re-exports all Sky animation classes.
+library animation;
+
+export 'package:sky/src/rendering/auto_layout.dart';
+
+export 'src/animation/animated_simulation.dart';
+export 'src/animation/animated_value.dart';
+export 'src/animation/animation_performance.dart';
+export 'src/animation/curves.dart';
+export 'src/animation/forces.dart';
+export 'src/animation/scheduler.dart';
+export 'src/animation/scroll_behavior.dart';
+export 'src/animation/timeline.dart';

sky/packages/sky/lib/animation/direction.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.
-
-enum Direction {
-  forward,
-  reverse
-}

sky/packages/sky/lib/base/debug.dart

@@ -40,6 +40,3 @@ const sky.Color debugPaintLayerBordersColor = const sky.Color(0xFFFF9800);
 
 /// Causes RenderObjects to paint warnings when painting outside their bounds.
 bool debugPaintBoundsEnabled = false;
-
-/// Slows down animations by this factor to help in development.
-double timeDilation = 1.0;

sky/packages/sky/lib/base/scheduler.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:collection';
-import 'dart:sky' as sky;
-
-import 'package:sky/base/debug.dart';
-
-/// A callback from the scheduler
-///
-/// The timeStamp is the number of milliseconds since the beginning of the
-/// scheduler's epoch. Use timeStamp to determine how far to advance animation
-/// timelines so that all the animations in the system are synchronized to a
-/// common time base.
-typedef void SchedulerCallback(double timeStamp);
-
-bool _haveScheduledVisualUpdate = false;
-int _nextCallbackId = 1;
-
-final List<SchedulerCallback> _persistentCallbacks = new List<SchedulerCallback>();
-Map<int, SchedulerCallback> _transientCallbacks = new LinkedHashMap<int, SchedulerCallback>();
-final Set<int> _removedIds = new Set<int>();
-
-/// Called by the engine to produce a new frame.
-///
-/// This function first calls all the callbacks registered by
-/// [requestAnimationFrame] and then calls all the callbacks registered by
-/// [addPersistentFrameCallback], which typically drive the rendering pipeline.
-void beginFrame(double timeStamp) {
-  timeStamp /= timeDilation;
-
-  _haveScheduledVisualUpdate = false;
-
-  Map<int, SchedulerCallback> callbacks = _transientCallbacks;
-  _transientCallbacks = new Map<int, SchedulerCallback>();
-
-  callbacks.forEach((id, callback) {
-    if (!_removedIds.contains(id))
-      callback(timeStamp);
-  });
-  _removedIds.clear();
-
-  for (SchedulerCallback callback in _persistentCallbacks)
-    callback(timeStamp);
-}
-
-/// Registers [beginFrame] callback with the engine.
-void init() {
-  sky.view.setFrameCallback(beginFrame);
-}
-
-/// Call callback every frame.
-void addPersistentFrameCallback(SchedulerCallback callback) {
-  _persistentCallbacks.add(callback);
-}
-
-/// Schedule a callback for the next frame.
-///
-/// The callback will be run prior to flushing the main rendering pipeline.
-/// Typically, requestAnimationFrame is used to throttle writes into the
-/// rendering pipeline until the system is ready to accept a new frame. For
-/// example, if you wanted to tick through an animation, you should use
-/// requestAnimation frame to determine when to tick the animation. The callback
-/// is passed a timeStamp that you can use to determine how far along the
-/// timeline to advance your animation.
-///
-/// Returns an id that can be used to unschedule this callback.
-int requestAnimationFrame(SchedulerCallback callback) {
-  int id = _nextCallbackId++;
-  _transientCallbacks[id] = callback;
-  ensureVisualUpdate();
-  return id;
-}
-
-/// Cancel the callback identified by id.
-void cancelAnimationFrame(int id) {
-  _transientCallbacks.remove(id);
-  _removedIds.add(id);
-}
-
-/// Ensure that a frame will be produced after this function is called.
-void ensureVisualUpdate() {
-  if (_haveScheduledVisualUpdate)
-    return;
-  sky.view.scheduleFrame();
-  _haveScheduledVisualUpdate = true;
-}

sky/packages/sky/lib/painting/README.md

 This directory contains painting-related libraries that only depend on
-core Dart libraries, ../base/*, and ../animation/*. Note that
-../animation/* depends on the Newton Dart library also.
+core Dart libraries, `../base/*`, and [animation.dart](../animation.dart). Note
+that [animation.dart](../animation.dart) depends on the Newton Dart library.

sky/packages/sky/lib/painting/radial_reaction.dart

@@ -6,9 +6,7 @@ import 'dart:async';
 import 'dart:sky' as sky;
 import 'dart:sky' show Point, Offset, Color, Paint;
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 
 const Duration _kShowDuration = const Duration(milliseconds: 300);
 const Duration _kHideDuration = const Duration(milliseconds: 200);

sky/packages/sky/lib/animation/README.md → sky/packages/sky/lib/src/animation/README.md

 This directory contains animation-related libraries that only depend
-on core Dart libraries, the Newton Dart library, and ../base/*.
+on core Dart libraries and the Newton Dart library.

sky/packages/sky/lib/animation/animated_simulation.dart → sky/packages/sky/lib/src/animation/animated_simulation.dart

@@ -5,7 +5,7 @@
 import 'dart:async';
 
 import 'package:newton/newton.dart';
-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/src/animation/scheduler.dart';
 
 const double _kSecondsPerMillisecond = 1000.0;
 

sky/packages/sky/lib/animation/animated_value.dart → sky/packages/sky/lib/src/animation/animated_value.dart

@@ -4,10 +4,12 @@
 
 import "dart:sky";
 
-import 'package:sky/animation/curves.dart';
-import 'package:sky/animation/direction.dart';
+import 'package:sky/src/animation/curves.dart';
 
-export 'package:sky/animation/curves.dart' show Interval;
+enum Direction {
+  forward,
+  reverse
+}
 
 abstract class AnimatedVariable {
   void setProgress(double t, Direction direction);

sky/packages/sky/lib/animation/animation_performance.dart → sky/packages/sky/lib/src/animation/animation_performance.dart

@@ -4,12 +4,9 @@
 
 import 'dart:async';
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/direction.dart';
-import 'package:sky/animation/forces.dart';
-import 'package:sky/animation/timeline.dart';
-
-export 'package:sky/animation/direction.dart' show Direction;
+import 'package:sky/src/animation/animated_value.dart';
+import 'package:sky/src/animation/forces.dart';
+import 'package:sky/src/animation/timeline.dart';
 
 enum AnimationStatus {
   dismissed, // stoped at 0

sky/packages/sky/lib/animation/curves.dart → sky/packages/sky/lib/src/animation/curves.dart

@@ -39,22 +39,6 @@ class Interval implements Curve {
   }
 }
 
-class ParabolicFall implements Curve {
-  const ParabolicFall();
-
-  double transform(double t) {
-    return -t*t + 1;
-  }
-}
-
-class ParabolicRise implements Curve {
-  const ParabolicRise();
-
-  double transform(double t) {
-    return -(t-1)*(t-1) + 1;
-  }
-}
-
 class Cubic implements Curve {
   final double a;
   final double b;
@@ -162,8 +146,6 @@ const Cubic ease = const Cubic(0.25, 0.1, 0.25, 1.0);
 const Cubic easeIn = const Cubic(0.42, 0.0, 1.0, 1.0);
 const Cubic easeOut = const Cubic(0.0, 0.0, 0.58, 1.0);
 const Cubic easeInOut = const Cubic(0.42, 0.0, 0.58, 1.0);
-const ParabolicRise parabolicRise = const ParabolicRise();
-const ParabolicFall parabolicFall = const ParabolicFall();
 const BounceInCurve bounceIn = const BounceInCurve();
 const BounceOutCurve bounceOut = const BounceOutCurve();
 const BounceInOutCurve bounceInOut = const BounceInOutCurve();

sky/packages/sky/lib/animation/forces.dart → sky/packages/sky/lib/src/animation/forces.dart

@@ -6,22 +6,25 @@ import 'package:newton/newton.dart';
 
 // Base class for creating Simulations for the animation Timeline.
 abstract class Force {
+  const Force();
+
   Simulation release(double position, double velocity);
 }
 
 class SpringForce extends Force {
-  SpringForce(this.spring, { this.left: 0.0, this.right: 1.0 });
+  const SpringForce(this.spring, { this.left: 0.0, this.right: 1.0 });
 
   final SpringDescription spring;
 
   // Where to put the spring's resting point when releasing left or right,
   // respectively.
-  final double left, right;
+  final double left;
+  final double right;
 
   // We overshoot the target by this distance, but stop the simulation when
   // the spring gets within this distance (regardless of how fast it's moving).
   // This causes the spring to settle a bit faster than it otherwise would.
-  static final Tolerance tolerance = new Tolerance(
+  static const Tolerance tolerance = const Tolerance(
     velocity: double.INFINITY,
     distance: 0.01
   );

sky/packages/sky/lib/src/animation/scheduler.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:collection';
+import 'dart:sky' as sky;
+
+/// Slows down animations by this factor to help in development.
+double timeDilation = 1.0;
+
+/// A callback from the scheduler
+///
+/// The timeStamp is the number of milliseconds since the beginning of the
+/// scheduler's epoch. Use timeStamp to determine how far to advance animation
+/// timelines so that all the animations in the system are synchronized to a
+/// common time base.
+typedef void SchedulerCallback(double timeStamp);
+
+/// Schedules callbacks to run in concert with the engine's animation system
+class Scheduler {
+  /// Requires clients to use the [scheduler] singleton
+  Scheduler._() {
+    sky.view.setFrameCallback(beginFrame);
+  }
+
+  bool _haveScheduledVisualUpdate = false;
+  int _nextCallbackId = 1;
+
+  final List<SchedulerCallback> _persistentCallbacks = new List<SchedulerCallback>();
+  Map<int, SchedulerCallback> _transientCallbacks = new LinkedHashMap<int, SchedulerCallback>();
+  final Set<int> _removedIds = new Set<int>();
+
+  /// Called by the engine to produce a new frame.
+  ///
+  /// This function first calls all the callbacks registered by
+  /// [requestAnimationFrame] and then calls all the callbacks registered by
+  /// [addPersistentFrameCallback], which typically drive the rendering pipeline.
+  void beginFrame(double timeStamp) {
+    timeStamp /= timeDilation;
+
+    _haveScheduledVisualUpdate = false;
+
+    Map<int, SchedulerCallback> callbacks = _transientCallbacks;
+    _transientCallbacks = new Map<int, SchedulerCallback>();
+
+    callbacks.forEach((id, callback) {
+      if (!_removedIds.contains(id))
+        callback(timeStamp);
+    });
+    _removedIds.clear();
+
+    for (SchedulerCallback callback in _persistentCallbacks)
+      callback(timeStamp);
+  }
+
+  /// Call callback every frame.
+  void addPersistentFrameCallback(SchedulerCallback callback) {
+    _persistentCallbacks.add(callback);
+  }
+
+  /// Schedule a callback for the next frame.
+  ///
+  /// The callback will be run prior to flushing the main rendering pipeline.
+  /// Typically, requestAnimationFrame is used to throttle writes into the
+  /// rendering pipeline until the system is ready to accept a new frame. For
+  /// example, if you wanted to tick through an animation, you should use
+  /// requestAnimation frame to determine when to tick the animation. The callback
+  /// is passed a timeStamp that you can use to determine how far along the
+  /// timeline to advance your animation.
+  ///
+  /// Returns an id that can be used to unschedule this callback.
+  int requestAnimationFrame(SchedulerCallback callback) {
+    int id = _nextCallbackId++;
+    _transientCallbacks[id] = callback;
+    ensureVisualUpdate();
+    return id;
+  }
+
+  /// Cancel the callback identified by id.
+  void cancelAnimationFrame(int id) {
+    _transientCallbacks.remove(id);
+    _removedIds.add(id);
+  }
+
+  /// Ensure that a frame will be produced after this function is called.
+  void ensureVisualUpdate() {
+    if (_haveScheduledVisualUpdate)
+      return;
+    sky.view.scheduleFrame();
+    _haveScheduledVisualUpdate = true;
+  }
+}
+
+/// A singleton instance of Scheduler to coordinate all the callbacks.
+final Scheduler scheduler = new Scheduler._();

sky/packages/sky/lib/animation/timeline.dart → sky/packages/sky/lib/src/animation/timeline.dart

@@ -5,7 +5,8 @@
 import 'dart:async';
 
 import 'package:newton/newton.dart';
-import 'package:sky/animation/animated_simulation.dart';
+
+import 'package:sky/src/animation/animated_simulation.dart';
 
 // Simple simulation that linearly varies from |begin| to |end| over |duration|.
 class TweenSimulation extends Simulation {

sky/packages/sky/lib/src/rendering/README.md

@@ -372,8 +372,8 @@ This can be quite useful in figuring out exactly what is going on when
 working with the render tree.
 
 ```dart
-import 'package:sky/src/rendering/sky_binding.dart';
-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/animation.dart';
+import 'package:sky/rendering.dart';
 
 scheduler.addPersistentFrameCallback((_) {
   SkyBinding.instance.debugDumpRenderTree();
@@ -384,6 +384,6 @@ scheduler.addPersistentFrameCallback((_) {
 Dependencies
 ------------
 
- * [`package:sky/base`](../base)
- * [`package:sky/mojo`](../mojo)
- * [`package:sky/animation`](../mojo)
+ * [`package:sky/base`](../../base)
+ * [`package:sky/mojo`](../../mojo)
+ * [`package:sky/animation.dart`](../../animation.dart)

sky/packages/sky/lib/src/rendering/object.dart

@@ -6,10 +6,10 @@ import 'dart:math' as math;
 import 'dart:sky' as sky;
 import 'dart:sky' show Point, Offset, Size, Rect, Color, Paint, Path;
 
+import 'package:sky/animation.dart';
 import 'package:sky/base/debug.dart';
 import 'package:sky/base/hit_test.dart';
 import 'package:sky/base/node.dart';
-import 'package:sky/base/scheduler.dart' as scheduler;
 import 'package:sky/src/rendering/layer.dart';
 import 'package:vector_math/vector_math.dart';
 

sky/packages/sky/lib/src/rendering/sky_binding.dart

@@ -4,9 +4,9 @@
 
 import 'dart:sky' as sky;
 
-import 'package:sky/base/pointer_router.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/base/hit_test.dart';
-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/base/pointer_router.dart';
 import 'package:sky/gestures/arena.dart';
 import 'package:sky/src/rendering/box.dart';
 import 'package:sky/src/rendering/object.dart';
@@ -45,7 +45,6 @@ class SkyBinding extends HitTestTarget {
     sky.view.setEventCallback(_handleEvent);
 
     sky.view.setMetricsChangedCallback(_handleMetricsChanged);
-    scheduler.init();
     if (renderViewOverride == null) {
       _renderView = new RenderView(child: root);
       _renderView.attach();

sky/packages/sky/lib/src/rendering/toggleable.dart

@@ -4,9 +4,7 @@
 
 import 'dart:sky' as sky;
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/src/rendering/box.dart';
 import 'package:sky/src/rendering/object.dart';
 import 'package:sky/src/rendering/proxy_box.dart';

sky/packages/sky/lib/src/rendering/view.dart

@@ -4,7 +4,7 @@
 
 import 'dart:sky' as sky;
 
-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/animation.dart';
 import 'package:sky/src/rendering/layer.dart';
 import 'package:sky/src/rendering/object.dart';
 import 'package:sky/src/rendering/box.dart';

sky/packages/sky/lib/src/widgets/README.md

@@ -500,8 +500,8 @@ Dependencies
 ------------
 
  * `package:vector_math`
- * [`package:sky/animation`](../animation)
- * [`package:sky/base`](../base)
- * [`package:sky/painting`](../painting)
- * [`package:sky/rendering`](../rendering)
- * [`package:sky/theme`](../theme)
+ * [`package:sky/animation.dart`](../../animation.dart)
+ * [`package:sky/base`](../../base)
+ * [`package:sky/painting`](../../painting)
+ * [`package:sky/rendering.dart`](../../rendering.dart)
+ * [`package:sky/theme`](../../theme)

sky/packages/sky/lib/src/widgets/animated_component.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/animation/animation_performance.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/src/widgets/framework.dart';
 
 abstract class AnimatedComponent extends StatefulComponent {

sky/packages/sky/lib/src/widgets/animated_container.dart

@@ -5,9 +5,7 @@
 import 'dart:sky' as sky;
 
 import 'package:vector_math/vector_math.dart';
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/painting/box_painter.dart';
 import 'package:sky/src/widgets/animated_component.dart';
 import 'package:sky/src/widgets/basic.dart';

sky/packages/sky/lib/src/widgets/dialog.dart

@@ -4,8 +4,7 @@
 
 import 'dart:async';
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/src/widgets/basic.dart';
 import 'package:sky/src/widgets/default_text_style.dart';

sky/packages/sky/lib/src/widgets/dismissable.dart

@@ -4,9 +4,7 @@
 
 import 'dart:sky' as sky;
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/src/widgets/basic.dart';
 import 'package:sky/src/widgets/transitions.dart';
 import 'package:sky/src/widgets/framework.dart';

sky/packages/sky/lib/src/widgets/drawer.dart

@@ -5,9 +5,7 @@
 import 'dart:async';
 import 'dart:sky' as sky;
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/forces.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/shadows.dart';
 import 'package:sky/src/widgets/animated_container.dart';
@@ -19,8 +17,6 @@ import 'package:sky/src/widgets/scrollable.dart';
 import 'package:sky/src/widgets/theme.dart';
 import 'package:sky/src/widgets/transitions.dart';
 
-export 'package:sky/animation/animation_performance.dart' show AnimationStatus;
-
 // TODO(eseidel): Draw width should vary based on device size:
 // http://www.google.com/design/spec/layout/structure.html#structure-side-nav
 

sky/packages/sky/lib/src/widgets/framework.dart

@@ -6,8 +6,8 @@ import 'dart:async';
 import 'dart:collection';
 import 'dart:sky' as sky;
 
+import 'package:sky/animation.dart';
 import 'package:sky/base/hit_test.dart';
-import 'package:sky/base/scheduler.dart' as scheduler;
 import 'package:sky/mojo/activity.dart';
 import 'package:sky/src/rendering/box.dart';
 import 'package:sky/src/rendering/object.dart';

sky/packages/sky/lib/src/widgets/ink_well.dart

@@ -5,12 +5,8 @@
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
-import 'package:sky/src/rendering/box.dart';
-import 'package:sky/src/rendering/object.dart';
-import 'package:sky/src/rendering/proxy_box.dart';
+import 'package:sky/animation.dart';
+import 'package:sky/rendering.dart';
 import 'package:sky/src/widgets/basic.dart';
 import 'package:sky/src/widgets/framework.dart';
 

sky/packages/sky/lib/src/widgets/mimic_overlay.dart

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/src/widgets/animated_component.dart';
 import 'package:sky/src/widgets/basic.dart';
 import 'package:sky/src/widgets/framework.dart';

sky/packages/sky/lib/src/widgets/navigator.dart

@@ -2,9 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/src/widgets/basic.dart';
 import 'package:sky/src/widgets/focus.dart';
 import 'package:sky/src/widgets/framework.dart';

sky/packages/sky/lib/src/widgets/popup_menu.dart

@@ -4,8 +4,7 @@
 
 import 'dart:sky' as sky;
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/painting/box_painter.dart';
 import 'package:sky/theme/colors.dart';
 import 'package:sky/theme/shadows.dart';
@@ -16,8 +15,6 @@ import 'package:sky/src/widgets/popup_menu_item.dart';
 import 'package:sky/src/widgets/scrollable.dart';
 import 'package:sky/src/widgets/transitions.dart';
 
-export 'package:sky/animation/animation_performance.dart' show AnimationStatus;
-
 const Duration _kMenuDuration = const Duration(milliseconds: 300);
 double _kMenuCloseIntervalEnd = 2.0 / 3.0;
 const double _kMenuWidthStep = 56.0;

sky/packages/sky/lib/src/widgets/progress_indicator.dart

@@ -5,9 +5,7 @@
 import 'dart:math' as math;
 import 'dart:sky' as sky;
 
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/src/widgets/basic.dart';
 import 'package:sky/src/widgets/theme.dart';
 import 'package:sky/src/widgets/framework.dart';

sky/packages/sky/lib/src/widgets/scrollable.dart

@@ -7,11 +7,7 @@ import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 import 'package:newton/newton.dart';
-import 'package:sky/animation/animated_simulation.dart';
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
-import 'package:sky/animation/scroll_behavior.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/gestures/constants.dart';
 import 'package:sky/src/rendering/box.dart';
 import 'package:sky/src/rendering/viewport.dart';

sky/packages/sky/lib/src/widgets/snack_bar.dart

@@ -3,9 +3,7 @@
 // found in the LICENSE file.
 
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/curves.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/painting/text_style.dart';
 import 'package:sky/theme/typography.dart' as typography;
 import 'package:sky/src/widgets/basic.dart';
@@ -16,8 +14,6 @@ import 'package:sky/src/widgets/material.dart';
 import 'package:sky/src/widgets/theme.dart';
 import 'package:sky/src/widgets/transitions.dart';
 
-export 'package:sky/animation/animation_performance.dart' show AnimationStatus;
-
 typedef void SnackBarDismissedCallback();
 
 const Duration _kSlideInDuration = const Duration(milliseconds: 200);

sky/packages/sky/lib/src/widgets/tabs.dart

@@ -6,14 +6,9 @@ import 'dart:math' as math;
 import 'dart:sky' as sky;
 
 import 'package:newton/newton.dart';
-import 'package:sky/animation/animation_performance.dart';
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/curves.dart';
-import 'package:sky/animation/scroll_behavior.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/painting/text_style.dart';
-import 'package:sky/src/rendering/box.dart';
-import 'package:sky/src/rendering/object.dart';
-import 'package:sky/src/rendering/viewport.dart';
+import 'package:sky/rendering.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/typography.dart' as typography;
 import 'package:sky/src/widgets/basic.dart';

sky/packages/sky/lib/src/widgets/transitions.dart

@@ -2,14 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:sky/animation/animated_value.dart';
-import 'package:sky/animation/animation_performance.dart';
+import 'package:sky/animation.dart';
 import 'package:sky/src/widgets/animated_component.dart';
 import 'package:sky/src/widgets/basic.dart';
 import 'package:sky/src/widgets/framework.dart';
 import 'package:vector_math/vector_math.dart';
 
-export 'package:sky/animation/direction.dart' show Direction;
+export 'package:sky/animation.dart' show Direction;
 
 // A helper class to anchor widgets to one another. Pass an instance of this to
 // a Transition, then use the build() method to create a child with the same

sky/unit/test/base/scheduler_test.dart → sky/unit/test/animation/scheduler_test.dart

-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/animation.dart';
 import 'package:test/test.dart';
 
 void main() {

sky/unit/test/widget/widget_tester.dart

 import 'dart:sky' as sky;
 
+import 'package:sky/animation.dart';
 import 'package:sky/rendering.dart';
 import 'package:sky/widgets.dart';
-import 'package:sky/base/scheduler.dart' as scheduler;
 
 import '../engine/mock_events.dart';
 

skysprites/lib/skysprites.dart

@@ -11,8 +11,7 @@ import 'dart:typed_data';
 import 'dart:sky';
 
 import 'package:mojo/core.dart';
-import 'package:sky/animation/curves.dart';
-import 'package:sky/base/scheduler.dart' as scheduler;
+import 'package:sky/animation.dart';
 import 'package:sky/mojo/asset_bundle.dart';
 import 'package:sky/mojo/shell.dart' as shell;
 import 'package:sky/painting/text_painter.dart';