Web Animations: Implement CSS Animation events

Source/core/animation/css/CSSAnimations.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 164 matching lines @@
                 existing->value->setPaused(paused);
                 inactive.remove(animationName.impl());
                 continue;
             }
 
             KeyframeAnimationEffect::KeyframeVector keyframes;
             element->document()->styleResolver()->resolveKeyframes(element, style, animationName.impl(), keyframes);
             if (!keyframes.isEmpty()) {
                 Timing timing;
                 timingFromAnimationData(animationData, timing);
+                OwnPtr<CSSAnimations::EventDelegate> eventDelegate = adoptPtr(new EventDelegate(element, animationName));
                 m_animations.set(animationName.impl(), element->document()->timeline()->play(
-                    Animation::create(element, KeyframeAnimationEffect::create(keyframes), timing).get()).get());
+                    Animation::create(element, KeyframeAnimationEffect::create(keyframes), timing, eventDelegate.release()).get()).get());
             }
         }
     }
 
     for (HashSet<StringImpl*>::const_iterator iter = inactive.begin(); iter != inactive.end(); ++iter)
         m_animations.take(*iter)->cancel();
 }
 
 void CSSAnimations::cancel()
 {
     for (AnimationMap::iterator iter = m_animations.begin(); iter != m_animations.end(); ++iter)
         iter->value->cancel();
 
     m_animations.clear();
 }
 
+void CSSAnimations::EventDelegate::dispatch(Document::ListenerType listenerType, AtomicString& eventName, double elapsedTime)

[Steve Block, 2013/08/06 05:29:12]

Should this be called maybeDispatch(), as we only dispatch if a listener is
registered?

[dstockwell, 2013/08/06 06:10:02]

Done.

+{
+    if (m_target->document()->hasListenerType(listenerType))
+        m_target->document()->timeline()->addEventToDispatch(m_target, AnimationEvent::create(eventName, m_name, elapsedTime));

[Steve Block, 2013/08/06 05:29:12]

We receive the calls to EventDelegate::onEventCondition() synchronously when
sampling the TimeItems, so all events will have been added to the timeline by
the time DocumentTimeline::serviceAnimations() completes, right? I ask because
when I first saw this, I thought this call would schedule the event for dispatch
on the next sample. Maybe worth a comment?

[dstockwell, 2013/08/06 06:10:02]

Almost. Start events for new animations can be triggered outside of
serviceAnimations (as mentioned in the description). I'll add some comments
here.

+}
+
+void CSSAnimations::EventDelegate::onEventCondition(bool wasInPlay, bool isInPlay, double previousIteration, double currentIteration)
+{
+    // FIXME: Receive TimedItem as param in order to produce correct elapsed time value.
+    double elapsedTime = 0;
+    if (!wasInPlay && isInPlay) {
+        dispatch(Document::ANIMATIONSTART_LISTENER, eventNames().webkitAnimationStartEvent, elapsedTime);
+        return;
+    }
+    if (wasInPlay && isInPlay && currentIteration != previousIteration) {
+        dispatch(Document::ANIMATIONITERATION_LISTENER, eventNames().webkitAnimationIterationEvent, elapsedTime);
+        return;
+    }
+    if (wasInPlay && !isInPlay) {
+        dispatch(Document::ANIMATIONEND_LISTENER, eventNames().webkitAnimationEndEvent, elapsedTime);
+        return;
+    }
+}
+
 } // namespace WebCore