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third_party/polymer/components/web-animations-js/src/animation.js

Index: third_party/polymer/components/web-animations-js/src/animation.js
diff --git a/third_party/polymer/components/web-animations-js/src/animation.js b/third_party/polymer/components/web-animations-js/src/animation.js
new file mode 100644
index 0000000000000000000000000000000000000000..e9f648268755122a359704b7b50b1d02bc3a5d0d
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+++ b/third_party/polymer/components/web-animations-js/src/animation.js
@@ -0,0 +1,279 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//     You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//     See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function(shared, scope, testing) {
+
+  shared.sequenceNumber = 0;
+
+  var AnimationEvent = function(target, currentTime, timelineTime) {
+    this.target = target;
+    this.currentTime = currentTime;
+    this.timelineTime = timelineTime;
+
+    this.type = 'finish';
+    this.bubbles = false;
+    this.cancelable = false;
+    this.currentTarget = target;
+    this.defaultPrevented = false;
+    this.eventPhase = Event.AT_TARGET;
+    this.timeStamp = Date.now();
+  };
+
+  scope.Animation = function(effect) {
+    this.id = '';
+    if (effect && effect._id) {
+      this.id = effect._id;
+    }
+    this._sequenceNumber = shared.sequenceNumber++;
+    this._currentTime = 0;
+    this._startTime = null;
+    this._paused = false;
+    this._playbackRate = 1;
+    this._inTimeline = true;
+    this._finishedFlag = true;
+    this.onfinish = null;
+    this._finishHandlers = [];
+    this._effect = effect;
+    this._inEffect = this._effect._update(0);
+    this._idle = true;
+    this._currentTimePending = false;
+  };
+
+  scope.Animation.prototype = {
+    _ensureAlive: function() {
+      // If an animation is playing backwards and is not fill backwards/both
+      // then it should go out of effect when it reaches the start of its
+      // active interval (currentTime == 0).
+      if (this.playbackRate < 0 && this.currentTime === 0) {
+        this._inEffect = this._effect._update(-1);
+      } else {
+        this._inEffect = this._effect._update(this.currentTime);
+      }
+      if (!this._inTimeline && (this._inEffect || !this._finishedFlag)) {
+        this._inTimeline = true;
+        scope.timeline._animations.push(this);
+      }
+    },
+    _tickCurrentTime: function(newTime, ignoreLimit) {
+      if (newTime != this._currentTime) {
+        this._currentTime = newTime;
+        if (this._isFinished && !ignoreLimit)
+          this._currentTime = this._playbackRate > 0 ? this._totalDuration : 0;
+        this._ensureAlive();
+      }
+    },
+    get currentTime() {
+      if (this._idle || this._currentTimePending)
+        return null;
+      return this._currentTime;
+    },
+    set currentTime(newTime) {
+      newTime = +newTime;
+      if (isNaN(newTime))
+        return;
+      scope.restart();
+      if (!this._paused && this._startTime != null) {
+        this._startTime = this._timeline.currentTime - newTime / this._playbackRate;
+      }
+      this._currentTimePending = false;
+      if (this._currentTime == newTime)
+        return;
+      if (this._idle) {
+        this._idle = false;
+        this._paused = true;
+      }
+      this._tickCurrentTime(newTime, true);
+      scope.applyDirtiedAnimation(this);
+    },
+    get startTime() {
+      return this._startTime;
+    },
+    set startTime(newTime) {
+      newTime = +newTime;
+      if (isNaN(newTime))
+        return;
+      if (this._paused || this._idle)
+        return;
+      this._startTime = newTime;
+      this._tickCurrentTime((this._timeline.currentTime - this._startTime) * this.playbackRate);
+      scope.applyDirtiedAnimation(this);
+    },
+    get playbackRate() {
+      return this._playbackRate;
+    },
+    set playbackRate(value) {
+      if (value == this._playbackRate) {
+        return;
+      }
+      var oldCurrentTime = this.currentTime;
+      this._playbackRate = value;
+      this._startTime = null;
+      if (this.playState != 'paused' && this.playState != 'idle') {
+        this._finishedFlag = false;
+        this._idle = false;
+        this._ensureAlive();
+        scope.applyDirtiedAnimation(this);
+      }
+      if (oldCurrentTime != null) {
+        this.currentTime = oldCurrentTime;
+      }
+    },
+    get _isFinished() {
+      return !this._idle && (this._playbackRate > 0 && this._currentTime >= this._totalDuration ||
+          this._playbackRate < 0 && this._currentTime <= 0);
+    },
+    get _totalDuration() { return this._effect._totalDuration; },
+    get playState() {
+      if (this._idle)
+        return 'idle';
+      if ((this._startTime == null && !this._paused && this.playbackRate != 0) || this._currentTimePending)
+        return 'pending';
+      if (this._paused)
+        return 'paused';
+      if (this._isFinished)
+        return 'finished';
+      return 'running';
+    },
+    _rewind: function() {
+      if (this._playbackRate >= 0) {
+        this._currentTime = 0;
+      } else if (this._totalDuration < Infinity) {
+        this._currentTime = this._totalDuration;
+      } else {
+        throw new DOMException(
+            'Unable to rewind negative playback rate animation with infinite duration',
+            'InvalidStateError');
+      }
+    },
+    play: function() {
+      this._paused = false;
+      if (this._isFinished || this._idle) {
+        this._rewind();
+        this._startTime = null;
+      }
+      this._finishedFlag = false;
+      this._idle = false;
+      this._ensureAlive();
+      scope.applyDirtiedAnimation(this);
+    },
+    pause: function() {
+      if (!this._isFinished && !this._paused && !this._idle) {
+        this._currentTimePending = true;
+      } else if (this._idle) {
+        this._rewind();
+        this._idle = false;
+      }
+      this._startTime = null;
+      this._paused = true;
+    },
+    finish: function() {
+      if (this._idle)
+        return;
+      this.currentTime = this._playbackRate > 0 ? this._totalDuration : 0;
+      this._startTime = this._totalDuration - this.currentTime;
+      this._currentTimePending = false;
+      scope.applyDirtiedAnimation(this);
+    },
+    cancel: function() {
+      if (!this._inEffect)
+        return;
+      this._inEffect = false;
+      this._idle = true;
+      this._paused = false;
+      this._isFinished = true;
+      this._finishedFlag = true;
+      this._currentTime = 0;
+      this._startTime = null;
+      this._effect._update(null);
+      // effects are invalid after cancellation as the animation state
+      // needs to un-apply.
+      scope.applyDirtiedAnimation(this);
+    },
+    reverse: function() {
+      this.playbackRate *= -1;
+      this.play();
+    },
+    addEventListener: function(type, handler) {
+      if (typeof handler == 'function' && type == 'finish')
+        this._finishHandlers.push(handler);
+    },
+    removeEventListener: function(type, handler) {
+      if (type != 'finish')
+        return;
+      var index = this._finishHandlers.indexOf(handler);
+      if (index >= 0)
+        this._finishHandlers.splice(index, 1);
+    },
+    _fireEvents: function(baseTime) {
+      if (this._isFinished) {
+        if (!this._finishedFlag) {
+          var event = new AnimationEvent(this, this._currentTime, baseTime);
+          var handlers = this._finishHandlers.concat(this.onfinish ? [this.onfinish] : []);
+          setTimeout(function() {
+            handlers.forEach(function(handler) {
+              handler.call(event.target, event);
+            });
+          }, 0);
+          this._finishedFlag = true;
+        }
+      } else {
+        this._finishedFlag = false;
+      }
+    },
+    _tick: function(timelineTime, isAnimationFrame) {
+      if (!this._idle && !this._paused) {
+        if (this._startTime == null) {
+          if (isAnimationFrame) {
+            this.startTime = timelineTime - this._currentTime / this.playbackRate;
+          }
+        } else if (!this._isFinished) {
+          this._tickCurrentTime((timelineTime - this._startTime) * this.playbackRate);
+        }
+      }
+
+      if (isAnimationFrame) {
+        this._currentTimePending = false;
+        this._fireEvents(timelineTime);
+      }
+    },
+    get _needsTick() {
+      return (this.playState in {'pending': 1, 'running': 1}) || !this._finishedFlag;
+    },
+    _targetAnimations: function() {
+      var target = this._effect._target;
+      if (!target._activeAnimations) {
+        target._activeAnimations = [];
+      }
+      return target._activeAnimations;
+    },
+    _markTarget: function() {
+      var animations = this._targetAnimations();
+      if (animations.indexOf(this) === -1) {
+        animations.push(this);
+      }
+    },
+    _unmarkTarget: function() {
+      var animations = this._targetAnimations();
+      var index = animations.indexOf(this);
+      if (index !== -1) {
+        animations.splice(index, 1);
+      }
+    },
+  };
+
+  if (WEB_ANIMATIONS_TESTING) {
+    testing.webAnimations1Animation = scope.Animation;
+  }
+
+})(webAnimationsShared, webAnimations1, webAnimationsTesting);