Move newton into package:flutter (#3585)

Rather that importing `package:newton/newton.dart` you can
`import package:flutter/physics.dart`.

Fixes #2441

CONTRIBUTING.md

@@ -78,9 +78,9 @@ Individual tests can also be run directly, e.g. `flutter test lib/my_app_test.da
 
 Flutter tests use [package:flutter_test](https://github.com/flutter/flutter/tree/master/packages/flutter_test) which provides flutter-specific extensions on top of [package:test](https://pub.dartlang.org/packages/test).
 
-`flutter test` runs tests inside the flutter shell.  Some packages inside the flutter repository can be run inside the dart command line VM as well as the flutter shell, `packages/newton` and `packages/flutter_tools` are two such examples:
+`flutter test` runs tests inside the flutter shell.  Some packages inside the flutter repository can be run inside the dart command line VM as well as the flutter shell, `packages/flutter_tools` is one such examples:
 
- * `cd packages/newton`
+ * `cd packages/flutter_tools`
  * `pub run test`
 
 `flutter test --flutter-repo` is a shortcut for those working on the flutter repository itself which runs all tests inside the `flutter` package regardless of the current working directory.

packages/flutter/lib/animation.dart

@@ -3,12 +3,12 @@
 // found in the LICENSE file.
 
 /// The Flutter animation system.
-/// 
+///
 /// To use, import `package:flutter/animation.dart`.
 ///
 /// See [flutter.io/animations](https://flutter.io/animations/) for an overview.
 ///
-/// This library depends only on core Dart libraries and the `newton` package.
+/// This library depends only on core Dart libraries and the `physics.dart` library.
 library animation;
 
 export 'src/animation/animation.dart';

packages/newton/lib/newton.dart → packages/flutter/lib/physics.dart

@@ -4,17 +4,16 @@
 
 /// Simple one-dimensional physics simulations, such as springs, friction, and
 /// gravity, for use in user interface animations.
-/// 
-/// This library is not meant to be imported by developers.
-/// It will soon be integrated into another Flutter library.
-library newton;
+///
+/// To use, import `package:flutter/physics.dart`.
+library physics;
 
-export 'src/clamped_simulation.dart';
-export 'src/friction_simulation.dart';
-export 'src/gravity_simulation.dart';
-export 'src/scroll_simulation.dart';
-export 'src/simulation_group.dart';
-export 'src/simulation.dart';
-export 'src/spring_simulation.dart';
-export 'src/tolerance.dart';
-export 'src/utils.dart';
+export 'src/physics/clamped_simulation.dart';
+export 'src/physics/friction_simulation.dart';
+export 'src/physics/gravity_simulation.dart';
+export 'src/physics/scroll_simulation.dart';
+export 'src/physics/simulation_group.dart';
+export 'src/physics/simulation.dart';
+export 'src/physics/spring_simulation.dart';
+export 'src/physics/tolerance.dart';
+export 'src/physics/utils.dart';

packages/flutter/lib/src/animation/animation_controller.dart

@@ -6,7 +6,7 @@ import 'dart:async';
 import 'dart:ui' as ui show lerpDouble;
 
 import 'package:flutter/scheduler.dart';
-import 'package:newton/newton.dart';
+import 'package:flutter/physics.dart';
 
 import 'animation.dart';
 import 'curves.dart';

packages/flutter/lib/src/animation/forces.dart

@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:newton/newton.dart';
+import 'package:flutter/physics.dart';
 
-export 'package:newton/newton.dart' show SpringDescription;
+export 'package:flutter/physics.dart' show SpringDescription;
 
 /// A factory for simulations.
 abstract class Force {

packages/flutter/lib/src/material/tabs.dart

@@ -5,7 +5,7 @@
 import 'dart:async';
 import 'dart:math' as math;
 
-import 'package:newton/newton.dart';
+import 'package:flutter/physics.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 

packages/flutter/lib/src/widgets/scroll_behavior.dart

@@ -4,7 +4,7 @@
 
 import 'dart:math' as math;
 
-import 'package:newton/newton.dart';
+import 'package:flutter/physics.dart';
 
 const double _kSecondsPerMillisecond = 1000.0;
 const double _kScrollDrag = 0.025;

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

@@ -6,7 +6,7 @@ import 'dart:async';
 import 'dart:math' as math;
 import 'dart:ui' as ui show window;
 
-import 'package:newton/newton.dart';
+import 'package:flutter/physics.dart';
 import 'package:flutter/gestures.dart';
 import 'package:meta/meta.dart';
 

packages/flutter/pubspec.yaml

@@ -21,8 +21,6 @@ dependencies:
 
   cassowary:
     path: ../cassowary
-  newton:
-    path: ../newton
 
 dev_dependencies:
   flutter_test:

packages/newton/test/near_equal_test.dart → packages/flutter/test/physics/near_equal_test.dart

@@ -4,7 +4,7 @@
 
 import 'package:test/test.dart';
 
-import 'package:newton/newton.dart';
+import 'package:flutter/physics.dart';
 
 void main() {
   test('test_friction', () {

packages/newton/test/newton_test.dart → packages/flutter/test/physics/newton_test.dart

@@ -4,7 +4,7 @@
 
 import 'package:test/test.dart';
 
-import 'package:newton/newton.dart';
+import 'package:flutter/physics.dart';
 
 void main() {
   test('test_friction', () {

packages/newton/README.md

-# Newton
-
-Simple Physics Simulations for Dart. Springs, friction, gravity, etc.
-
-To run the tests:
-
-- pub get
-- pub run test

packages/newton/pubspec.yaml

-name: newton
-description: Simple Physics Simulations for Dart
-version: 0.1.5
-author: Flutter Authors <flutter-dev@googlegroups.com>
-homepage: https://github.com/flutter/flutter/tree/master/packages/newton
-environment:
-  sdk: '>=1.0.0 <2.0.0'
-dev_dependencies:
-  flutter_test:
-    path: ../flutter_test

packages/newton/test/all.dart

-// Copyright (c) 2016 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 'near_equal_test.dart' as near_equal_test;
-import 'newton_test.dart' as newton_test;
-
-void main() {
-  near_equal_test.main();
-  newton_test.main();
-}

travis/test.sh

@@ -17,7 +17,6 @@ flutter analyze --flutter-repo
 (cd packages/flutter_test; flutter test)
 (cd packages/flutter_tools; dart -c test/all.dart)
 (cd packages/flx; dart -c test/all.dart)
-(cd packages/newton; dart -c test/all.dart)
 
 (cd dev/manual_tests; flutter test)
 (cd examples/hello_world; flutter test)