Source/WebCore/animation/DeclarativeAnimation.cpp - WebKit - Git at Google

 /*
  * Copyright (C) 2018 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "DeclarativeAnimation.h"

 #include "Animation.h"
 #include "AnimationEvent.h"
 #include "CSSAnimation.h"
 #include "CSSTransition.h"
 #include "DocumentTimeline.h"
 #include "Element.h"
 #include "EventNames.h"
 #include "KeyframeEffect.h"
 #include "PseudoElement.h"
 #include "TransitionEvent.h"
 #include <wtf/IsoMallocInlines.h>

 namespace WebCore {

 WTF_MAKE_ISO_ALLOCATED_IMPL(DeclarativeAnimation);

 DeclarativeAnimation::DeclarativeAnimation(Element& owningElement, const Animation& backingAnimation)
     : WebAnimation(owningElement.document())
     , m_eventQueue(MainThreadGenericEventQueue::create(owningElement))
     , m_owningElement(&owningElement)
     , m_backingAnimation(const_cast<Animation&>(backingAnimation))
 {
 }

 DeclarativeAnimation::~DeclarativeAnimation()
 {
 }

 void DeclarativeAnimation::tick()
 {
     bool wasRelevant = isRelevant();

     WebAnimation::tick();
     invalidateDOMEvents();

     // If a declarative animation transitions from a non-idle state to an idle state, it means it was
     // canceled using the Web Animations API and it should be disassociated from its owner element.
     // From this point on, this animation is like any other animation and should not appear in the
     // maps containing running CSS Transitions and CSS Animations for a given element.
     if (wasRelevant && playState() == WebAnimation::PlayState::Idle) {
         disassociateFromOwningElement();
         m_eventQueue->close();
     }
 }

 void DeclarativeAnimation::disassociateFromOwningElement()
 {
     if (!m_owningElement)
         return;

     if (auto* animationTimeline = timeline())
         animationTimeline->removeDeclarativeAnimationFromListsForOwningElement(*this, *m_owningElement);
     m_owningElement = nullptr;
 }

 bool DeclarativeAnimation::needsTick() const
 {
     return WebAnimation::needsTick() || m_eventQueue->hasPendingEvents();
 }

 void DeclarativeAnimation::remove()
 {
     m_eventQueue->close();
     WebAnimation::remove();
 }

 void DeclarativeAnimation::setBackingAnimation(const Animation& backingAnimation)
 {
     m_backingAnimation = const_cast<Animation&>(backingAnimation);
     syncPropertiesWithBackingAnimation();
 }

 void DeclarativeAnimation::initialize(const RenderStyle* oldStyle, const RenderStyle& newStyle)
 {
     // We need to suspend invalidation of the animation's keyframe effect during its creation
     // as it would otherwise trigger invalidation of the document's style and this would be
     // incorrect since it would happen during style invalidation.
     suspendEffectInvalidation();

     ASSERT(m_owningElement);

     setEffect(KeyframeEffect::create(*m_owningElement));
     setTimeline(&m_owningElement->document().timeline());
     downcast<KeyframeEffect>(effect())->computeDeclarativeAnimationBlendingKeyframes(oldStyle, newStyle);
     syncPropertiesWithBackingAnimation();
     if (backingAnimation().playState() == AnimationPlayState::Playing)
         play();
     else
         pause();

     unsuspendEffectInvalidation();
 }

 void DeclarativeAnimation::syncPropertiesWithBackingAnimation()
 {
 }

 Optional<double> DeclarativeAnimation::startTime() const
 {
     flushPendingStyleChanges();
     return WebAnimation::startTime();
 }

 void DeclarativeAnimation::setStartTime(Optional<double> startTime)
 {
     flushPendingStyleChanges();
     return WebAnimation::setStartTime(startTime);
 }

 Optional<double> DeclarativeAnimation::bindingsCurrentTime() const
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsCurrentTime();
 }

 ExceptionOr<void> DeclarativeAnimation::setBindingsCurrentTime(Optional<double> currentTime)
 {
     flushPendingStyleChanges();
     return WebAnimation::setBindingsCurrentTime(currentTime);
 }

 WebAnimation::PlayState DeclarativeAnimation::bindingsPlayState() const
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsPlayState();
 }

 WebAnimation::ReplaceState DeclarativeAnimation::bindingsReplaceState() const
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsReplaceState();
 }

 bool DeclarativeAnimation::bindingsPending() const
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsPending();
 }

 WebAnimation::ReadyPromise& DeclarativeAnimation::bindingsReady()
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsReady();
 }

 WebAnimation::FinishedPromise& DeclarativeAnimation::bindingsFinished()
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsFinished();
 }

 ExceptionOr<void> DeclarativeAnimation::bindingsPlay()
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsPlay();
 }

 ExceptionOr<void> DeclarativeAnimation::bindingsPause()
 {
     flushPendingStyleChanges();
     return WebAnimation::bindingsPause();
 }

 void DeclarativeAnimation::flushPendingStyleChanges() const
 {
     if (auto* animationEffect = effect()) {
         if (is<KeyframeEffect>(animationEffect)) {
             if (auto* target = downcast<KeyframeEffect>(animationEffect)->target())
                 target->document().updateStyleIfNeeded();
         }
     }
 }

 void DeclarativeAnimation::setTimeline(RefPtr<AnimationTimeline>&& newTimeline)
 {
     if (timeline() && !newTimeline)
         cancel();

     WebAnimation::setTimeline(WTFMove(newTimeline));
 }

 void DeclarativeAnimation::cancel()
 {
     auto cancelationTime = 0_s;
     if (auto* animationEffect = effect()) {
         if (auto activeTime = animationEffect->getBasicTiming().activeTime)
             cancelationTime = *activeTime;
     }

     WebAnimation::cancel();

     invalidateDOMEvents(cancelationTime);
 }

 void DeclarativeAnimation::cancelFromStyle()
 {
     cancel();
     disassociateFromOwningElement();
 }

 AnimationEffectPhase DeclarativeAnimation::phaseWithoutEffect() const
 {
     // This shouldn't be called if we actually have an effect.
     ASSERT(!effect());

     auto animationCurrentTime = currentTime();
     if (!animationCurrentTime)
         return AnimationEffectPhase::Idle;

     // Since we don't have an effect, the duration will be zero so the phase is 'before' if the current time is less than zero.
     return *animationCurrentTime < 0_s ? AnimationEffectPhase::Before : AnimationEffectPhase::After;
 }

 void DeclarativeAnimation::invalidateDOMEvents(Seconds elapsedTime)
 {
     if (!m_owningElement)
         return;

     auto isPending = pending();
     if (isPending && m_wasPending)
         return;

     double iteration = 0;
     AnimationEffectPhase currentPhase;
     Seconds intervalStart;
     Seconds intervalEnd;

     auto* animationEffect = effect();
     if (animationEffect) {
         auto timing = animationEffect->getComputedTiming();
         if (auto computedIteration = timing.currentIteration)
             iteration = *computedIteration;
         currentPhase = timing.phase;
         intervalStart = std::max(0_s, Seconds::fromMilliseconds(std::min(-timing.delay, timing.activeDuration)));
         intervalEnd = std::max(0_s, Seconds::fromMilliseconds(std::min(timing.endTime - timing.delay, timing.activeDuration)));
     } else {
         iteration = 0;
         currentPhase = phaseWithoutEffect();
         intervalStart = 0_s;
         intervalEnd = 0_s;
     }

     bool wasActive = m_previousPhase == AnimationEffectPhase::Active;
     bool wasAfter = m_previousPhase == AnimationEffectPhase::After;
     bool wasBefore = m_previousPhase == AnimationEffectPhase::Before;
     bool wasIdle = m_previousPhase == AnimationEffectPhase::Idle;

     bool isActive = currentPhase == AnimationEffectPhase::Active;
     bool isAfter = currentPhase == AnimationEffectPhase::After;
     bool isBefore = currentPhase == AnimationEffectPhase::Before;
     bool isIdle = currentPhase == AnimationEffectPhase::Idle;

     if (is<CSSAnimation>(this)) {
         // https://drafts.csswg.org/css-animations-2/#events
         if ((wasIdle || wasBefore) && isActive)
             enqueueDOMEvent(eventNames().animationstartEvent, intervalStart);
         else if ((wasIdle || wasBefore) && isAfter) {
             enqueueDOMEvent(eventNames().animationstartEvent, intervalStart);
             enqueueDOMEvent(eventNames().animationendEvent, intervalEnd);
         } else if (wasActive && isBefore)
             enqueueDOMEvent(eventNames().animationendEvent, intervalStart);
         else if (wasActive && isActive && m_previousIteration != iteration) {
             auto iterationBoundary = iteration;
             if (m_previousIteration > iteration)
                 iterationBoundary++;
             auto elapsedTime = animationEffect ? animationEffect->iterationDuration() * (iterationBoundary - animationEffect->iterationStart()) : 0_s;
             enqueueDOMEvent(eventNames().animationiterationEvent, elapsedTime);
         } else if (wasActive && isAfter)
             enqueueDOMEvent(eventNames().animationendEvent, intervalEnd);
         else if (wasAfter && isActive)
             enqueueDOMEvent(eventNames().animationstartEvent, intervalEnd);
         else if (wasAfter && isBefore) {
             enqueueDOMEvent(eventNames().animationstartEvent, intervalEnd);
             enqueueDOMEvent(eventNames().animationendEvent, intervalStart);
         } else if ((!wasIdle && !wasAfter) && isIdle)
             enqueueDOMEvent(eventNames().animationcancelEvent, elapsedTime);
     } else if (is<CSSTransition>(this)) {
         // https://drafts.csswg.org/css-transitions-2/#transition-events
         if (wasIdle && (isPending || isBefore))
             enqueueDOMEvent(eventNames().transitionrunEvent, intervalStart);
         else if (wasIdle && isActive) {
             enqueueDOMEvent(eventNames().transitionrunEvent, intervalStart);
             enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
         } else if (wasIdle && isAfter) {
             enqueueDOMEvent(eventNames().transitionrunEvent, intervalStart);
             enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
             enqueueDOMEvent(eventNames().transitionendEvent, intervalEnd);
         } else if ((m_wasPending || wasBefore) && isActive)
             enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
         else if ((m_wasPending || wasBefore) && isAfter) {
             enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
             enqueueDOMEvent(eventNames().transitionendEvent, intervalEnd);
         } else if (wasActive && isAfter)
             enqueueDOMEvent(eventNames().transitionendEvent, intervalEnd);
         else if (wasActive && isBefore)
             enqueueDOMEvent(eventNames().transitionendEvent, intervalStart);
         else if (wasAfter && isActive)
             enqueueDOMEvent(eventNames().transitionstartEvent, intervalEnd);
         else if (wasAfter && isBefore) {
             enqueueDOMEvent(eventNames().transitionstartEvent, intervalEnd);
             enqueueDOMEvent(eventNames().transitionendEvent, intervalStart);
         } else if ((!wasIdle && !wasAfter) && isIdle)
             enqueueDOMEvent(eventNames().transitioncancelEvent, elapsedTime);
     }

     m_wasPending = isPending;
     m_previousPhase = currentPhase;
     m_previousIteration = iteration;
 }

 void DeclarativeAnimation::enqueueDOMEvent(const AtomString& eventType, Seconds elapsedTime)
 {
     ASSERT(m_owningElement);
     auto time = secondsToWebAnimationsAPITime(elapsedTime) / 1000;
     if (is<CSSAnimation>(this))
         m_eventQueue->enqueueEvent(AnimationEvent::create(eventType, downcast<CSSAnimation>(this)->animationName(), time));
     else if (is<CSSTransition>(this))
         m_eventQueue->enqueueEvent(TransitionEvent::create(eventType, downcast<CSSTransition>(this)->transitionProperty(), time, PseudoElement::pseudoElementNameForEvents(m_owningElement->pseudoId())));
 }

 void DeclarativeAnimation::stop()
 {
     WebAnimation::stop();
 }

 void DeclarativeAnimation::suspend(ReasonForSuspension reason)
 {
     WebAnimation::suspend(reason);
 }

 void DeclarativeAnimation::resume()
 {
     WebAnimation::resume();
 }

 } // namespace WebCore
	/*
	* Copyright (C) 2018 Apple 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:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "DeclarativeAnimation.h"

	#include "Animation.h"
	#include "AnimationEvent.h"
	#include "CSSAnimation.h"
	#include "CSSTransition.h"
	#include "DocumentTimeline.h"
	#include "Element.h"
	#include "EventNames.h"
	#include "KeyframeEffect.h"
	#include "PseudoElement.h"
	#include "TransitionEvent.h"
	#include <wtf/IsoMallocInlines.h>

	namespace WebCore {

	WTF_MAKE_ISO_ALLOCATED_IMPL(DeclarativeAnimation);

	DeclarativeAnimation::DeclarativeAnimation(Element& owningElement, const Animation& backingAnimation)
	: WebAnimation(owningElement.document())
	, m_eventQueue(MainThreadGenericEventQueue::create(owningElement))
	, m_owningElement(&owningElement)
	, m_backingAnimation(const_cast<Animation&>(backingAnimation))
	{
	}

	DeclarativeAnimation::~DeclarativeAnimation()
	{
	}

	void DeclarativeAnimation::tick()
	{
	bool wasRelevant = isRelevant();

	WebAnimation::tick();
	invalidateDOMEvents();

	// If a declarative animation transitions from a non-idle state to an idle state, it means it was
	// canceled using the Web Animations API and it should be disassociated from its owner element.
	// From this point on, this animation is like any other animation and should not appear in the
	// maps containing running CSS Transitions and CSS Animations for a given element.
	if (wasRelevant && playState() == WebAnimation::PlayState::Idle) {
	disassociateFromOwningElement();
	m_eventQueue->close();
	}
	}

	void DeclarativeAnimation::disassociateFromOwningElement()
	{
	if (!m_owningElement)
	return;

	if (auto* animationTimeline = timeline())
	animationTimeline->removeDeclarativeAnimationFromListsForOwningElement(this, m_owningElement);
	m_owningElement = nullptr;
	}

	bool DeclarativeAnimation::needsTick() const
	{
	return WebAnimation::needsTick() \|\| m_eventQueue->hasPendingEvents();
	}

	void DeclarativeAnimation::remove()
	{
	m_eventQueue->close();
	WebAnimation::remove();
	}

	void DeclarativeAnimation::setBackingAnimation(const Animation& backingAnimation)
	{
	m_backingAnimation = const_cast<Animation&>(backingAnimation);
	syncPropertiesWithBackingAnimation();
	}

	void DeclarativeAnimation::initialize(const RenderStyle* oldStyle, const RenderStyle& newStyle)
	{
	// We need to suspend invalidation of the animation's keyframe effect during its creation
	// as it would otherwise trigger invalidation of the document's style and this would be
	// incorrect since it would happen during style invalidation.
	suspendEffectInvalidation();

	ASSERT(m_owningElement);

	setEffect(KeyframeEffect::create(*m_owningElement));
	setTimeline(&m_owningElement->document().timeline());
	downcast<KeyframeEffect>(effect())->computeDeclarativeAnimationBlendingKeyframes(oldStyle, newStyle);
	syncPropertiesWithBackingAnimation();
	if (backingAnimation().playState() == AnimationPlayState::Playing)
	play();
	else
	pause();

	unsuspendEffectInvalidation();
	}

	void DeclarativeAnimation::syncPropertiesWithBackingAnimation()
	{
	}

	Optional<double> DeclarativeAnimation::startTime() const
	{
	flushPendingStyleChanges();
	return WebAnimation::startTime();
	}

	void DeclarativeAnimation::setStartTime(Optional<double> startTime)
	{
	flushPendingStyleChanges();
	return WebAnimation::setStartTime(startTime);
	}

	Optional<double> DeclarativeAnimation::bindingsCurrentTime() const
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsCurrentTime();
	}

	ExceptionOr<void> DeclarativeAnimation::setBindingsCurrentTime(Optional<double> currentTime)
	{
	flushPendingStyleChanges();
	return WebAnimation::setBindingsCurrentTime(currentTime);
	}

	WebAnimation::PlayState DeclarativeAnimation::bindingsPlayState() const
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsPlayState();
	}

	WebAnimation::ReplaceState DeclarativeAnimation::bindingsReplaceState() const
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsReplaceState();
	}

	bool DeclarativeAnimation::bindingsPending() const
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsPending();
	}

	WebAnimation::ReadyPromise& DeclarativeAnimation::bindingsReady()
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsReady();
	}

	WebAnimation::FinishedPromise& DeclarativeAnimation::bindingsFinished()
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsFinished();
	}

	ExceptionOr<void> DeclarativeAnimation::bindingsPlay()
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsPlay();
	}

	ExceptionOr<void> DeclarativeAnimation::bindingsPause()
	{
	flushPendingStyleChanges();
	return WebAnimation::bindingsPause();
	}

	void DeclarativeAnimation::flushPendingStyleChanges() const
	{
	if (auto* animationEffect = effect()) {
	if (is<KeyframeEffect>(animationEffect)) {
	if (auto* target = downcast<KeyframeEffect>(animationEffect)->target())
	target->document().updateStyleIfNeeded();
	}
	}
	}

	void DeclarativeAnimation::setTimeline(RefPtr<AnimationTimeline>&& newTimeline)
	{
	if (timeline() && !newTimeline)
	cancel();

	WebAnimation::setTimeline(WTFMove(newTimeline));
	}

	void DeclarativeAnimation::cancel()
	{
	auto cancelationTime = 0_s;
	if (auto* animationEffect = effect()) {
	if (auto activeTime = animationEffect->getBasicTiming().activeTime)
	cancelationTime = *activeTime;
	}

	WebAnimation::cancel();

	invalidateDOMEvents(cancelationTime);
	}

	void DeclarativeAnimation::cancelFromStyle()
	{
	cancel();
	disassociateFromOwningElement();
	}

	AnimationEffectPhase DeclarativeAnimation::phaseWithoutEffect() const
	{
	// This shouldn't be called if we actually have an effect.
	ASSERT(!effect());

	auto animationCurrentTime = currentTime();
	if (!animationCurrentTime)
	return AnimationEffectPhase::Idle;

	// Since we don't have an effect, the duration will be zero so the phase is 'before' if the current time is less than zero.
	return *animationCurrentTime < 0_s ? AnimationEffectPhase::Before : AnimationEffectPhase::After;
	}

	void DeclarativeAnimation::invalidateDOMEvents(Seconds elapsedTime)
	{
	if (!m_owningElement)
	return;

	auto isPending = pending();
	if (isPending && m_wasPending)
	return;

	double iteration = 0;
	AnimationEffectPhase currentPhase;
	Seconds intervalStart;
	Seconds intervalEnd;

	auto* animationEffect = effect();
	if (animationEffect) {
	auto timing = animationEffect->getComputedTiming();
	if (auto computedIteration = timing.currentIteration)
	iteration = *computedIteration;
	currentPhase = timing.phase;
	intervalStart = std::max(0_s, Seconds::fromMilliseconds(std::min(-timing.delay, timing.activeDuration)));
	intervalEnd = std::max(0_s, Seconds::fromMilliseconds(std::min(timing.endTime - timing.delay, timing.activeDuration)));
	} else {
	iteration = 0;
	currentPhase = phaseWithoutEffect();
	intervalStart = 0_s;
	intervalEnd = 0_s;
	}

	bool wasActive = m_previousPhase == AnimationEffectPhase::Active;
	bool wasAfter = m_previousPhase == AnimationEffectPhase::After;
	bool wasBefore = m_previousPhase == AnimationEffectPhase::Before;
	bool wasIdle = m_previousPhase == AnimationEffectPhase::Idle;

	bool isActive = currentPhase == AnimationEffectPhase::Active;
	bool isAfter = currentPhase == AnimationEffectPhase::After;
	bool isBefore = currentPhase == AnimationEffectPhase::Before;
	bool isIdle = currentPhase == AnimationEffectPhase::Idle;

	if (is<CSSAnimation>(this)) {
	// https://drafts.csswg.org/css-animations-2/#events
	if ((wasIdle \|\| wasBefore) && isActive)
	enqueueDOMEvent(eventNames().animationstartEvent, intervalStart);
	else if ((wasIdle \|\| wasBefore) && isAfter) {
	enqueueDOMEvent(eventNames().animationstartEvent, intervalStart);
	enqueueDOMEvent(eventNames().animationendEvent, intervalEnd);
	} else if (wasActive && isBefore)
	enqueueDOMEvent(eventNames().animationendEvent, intervalStart);
	else if (wasActive && isActive && m_previousIteration != iteration) {
	auto iterationBoundary = iteration;
	if (m_previousIteration > iteration)
	iterationBoundary++;
	auto elapsedTime = animationEffect ? animationEffect->iterationDuration() * (iterationBoundary - animationEffect->iterationStart()) : 0_s;
	enqueueDOMEvent(eventNames().animationiterationEvent, elapsedTime);
	} else if (wasActive && isAfter)
	enqueueDOMEvent(eventNames().animationendEvent, intervalEnd);
	else if (wasAfter && isActive)
	enqueueDOMEvent(eventNames().animationstartEvent, intervalEnd);
	else if (wasAfter && isBefore) {
	enqueueDOMEvent(eventNames().animationstartEvent, intervalEnd);
	enqueueDOMEvent(eventNames().animationendEvent, intervalStart);
	} else if ((!wasIdle && !wasAfter) && isIdle)
	enqueueDOMEvent(eventNames().animationcancelEvent, elapsedTime);
	} else if (is<CSSTransition>(this)) {
	// https://drafts.csswg.org/css-transitions-2/#transition-events
	if (wasIdle && (isPending \|\| isBefore))
	enqueueDOMEvent(eventNames().transitionrunEvent, intervalStart);
	else if (wasIdle && isActive) {
	enqueueDOMEvent(eventNames().transitionrunEvent, intervalStart);
	enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
	} else if (wasIdle && isAfter) {
	enqueueDOMEvent(eventNames().transitionrunEvent, intervalStart);
	enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
	enqueueDOMEvent(eventNames().transitionendEvent, intervalEnd);
	} else if ((m_wasPending \|\| wasBefore) && isActive)
	enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
	else if ((m_wasPending \|\| wasBefore) && isAfter) {
	enqueueDOMEvent(eventNames().transitionstartEvent, intervalStart);
	enqueueDOMEvent(eventNames().transitionendEvent, intervalEnd);
	} else if (wasActive && isAfter)
	enqueueDOMEvent(eventNames().transitionendEvent, intervalEnd);
	else if (wasActive && isBefore)
	enqueueDOMEvent(eventNames().transitionendEvent, intervalStart);
	else if (wasAfter && isActive)
	enqueueDOMEvent(eventNames().transitionstartEvent, intervalEnd);
	else if (wasAfter && isBefore) {
	enqueueDOMEvent(eventNames().transitionstartEvent, intervalEnd);
	enqueueDOMEvent(eventNames().transitionendEvent, intervalStart);
	} else if ((!wasIdle && !wasAfter) && isIdle)
	enqueueDOMEvent(eventNames().transitioncancelEvent, elapsedTime);
	}

	m_wasPending = isPending;
	m_previousPhase = currentPhase;
	m_previousIteration = iteration;
	}

	void DeclarativeAnimation::enqueueDOMEvent(const AtomString& eventType, Seconds elapsedTime)
	{
	ASSERT(m_owningElement);
	auto time = secondsToWebAnimationsAPITime(elapsedTime) / 1000;
	if (is<CSSAnimation>(this))
	m_eventQueue->enqueueEvent(AnimationEvent::create(eventType, downcast<CSSAnimation>(this)->animationName(), time));
	else if (is<CSSTransition>(this))
	m_eventQueue->enqueueEvent(TransitionEvent::create(eventType, downcast<CSSTransition>(this)->transitionProperty(), time, PseudoElement::pseudoElementNameForEvents(m_owningElement->pseudoId())));
	}

	void DeclarativeAnimation::stop()
	{
	WebAnimation::stop();
	}

	void DeclarativeAnimation::suspend(ReasonForSuspension reason)
	{
	WebAnimation::suspend(reason);
	}

	void DeclarativeAnimation::resume()
	{
	WebAnimation::resume();
	}

	} // namespace WebCore