Update all Angular libs (run update_all.sh).

third_party/pkg/angular/lib/animate/animation_loop.dart

+part of angular.animate;
+
+/**
+ * Window.animationFrame update loop that tracks and drives
+ * [LoopedAnimations]'s.
+ */
+@Injectable()
+class AnimationLoop {
+  final AnimationFrame _frames;
+  final Profiler _profiler;
+  final List<LoopedAnimation> _animations = [];
+  final VmTurnZone _zone;
+
+  bool _animationFrameQueued = false;
+
+  /**
+   * The animation runner requires an [AnimationFrame] to drive the animation
+   * frames, and profiler will report timing information for each of the
+   * animation frames.
+   */
+  AnimationLoop(this._frames, this._profiler, this._zone);
+
+  /**
+   * Start and play an animation through the state transitions defined in
+   * [Animation].
+   */
+  void play(LoopedAnimation animation) {
+    _animations.add(animation);
+    _queueAnimationFrame();
+  }
+
+  void _queueAnimationFrame() {
+    if (!_animationFrameQueued) {
+      _animationFrameQueued = true;
+
+      // TODO(codleogic): This should run outside of an angular scope digest.
+      _zone.runOutsideAngular(() {
+        _frames.animationFrame.then((timeInMs) => _animationFrame(timeInMs))
+            .catchError((error) => print(error));
+      });
+    }
+  }
+
+  /* On the browsers animation frame event, update each of the tracked
+   * animations. Group dom reads first, and and writes second.
+   *
+   *  At any point any animation may be updated by calling interrupt and cancel
+   *  with a reference to the [Animation] to cancel. The [AnimationRunner] will
+   *  then forget about the [Animation] and will not call any further methods on
+   *  the [Animation].
+   */
+  void _animationFrame(num timeInMs) {
+    _profiler.startTimer("AnimationRunner.AnimationFrame");
+    _animationFrameQueued = false;
+
+    _profiler.startTimer("AnimationRunner.AnimationFrame.DomReads");
+    // Dom reads
+    _read(timeInMs);
+    _profiler.stopTimer("AnimationRunner.AnimationFrame.DomReads");
+
+    _profiler.startTimer("AnimationRunner.AnimationFrame.DomMutates");
+    // Dom mutates
+    _update(timeInMs);
+    _profiler.stopTimer("AnimationRunner.AnimationFrame.DomMutates");
+
+    // We don't need to continue queuing animation frames
+    // if there are no more animations to process.
+    if (_animations.length > 0) {
+      _queueAnimationFrame();
+    }
+
+    _profiler.stopTimer("AnimationRunner.AnimationFrame");
+  }
+
+  void _update(num timeInMs) {
+    for (int i=0; i< _animations.length; i++) {
+      var controller = _animations[i];
+      if (!controller.update(timeInMs)) {
+        _animations.removeAt(i--);
+      }
+    }
+  }
+
+  void _read(num timeInMs) {
+    for (int i=0; i< _animations.length; i++) {
+      var animation = _animations[i];
+      animation.read(timeInMs);
+    }
+  }
+
+  /**
+   * Stop tracking and updating the [animation].
+   */
+  void forget(LoopedAnimation animation) {
+    assert(animation != null);
+    _animations.remove(animation);
+  }
+}
+
+/**
+ * Wrapper around window.requestAnimationFrame so it can be intercepted and
+ * tested.
+ */
+@Injectable()
+class AnimationFrame {
+  final dom.Window _wnd;
+  Future<num> get animationFrame => _wnd.animationFrame;
+
+  AnimationFrame(this._wnd);
+}