Source/WebCore/animation/CSSTransition.cpp

/*
 * Copyright (C) 2018 Apple Inc. All rights reserved.
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#include "config.h"
#include "CSSTransition.h"

#include "Animation.h"
#include "Element.h"
#include "KeyframeEffect.h"
#include <wtf/IsoMallocInlines.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(CSSTransition);

Ref<CSSTransition> CSSTransition::create(Element& owningElement, CSSPropertyID property, MonotonicTime generationTime, const Animation& backingAnimation, const RenderStyle* oldStyle, const RenderStyle& newStyle, Seconds delay, Seconds duration, const RenderStyle& reversingAdjustedStartStyle, double reversingShorteningFactor)
{
    auto result = adoptRef(*new CSSTransition(owningElement, property, generationTime, backingAnimation, newStyle, reversingAdjustedStartStyle, reversingShorteningFactor));
    result->initialize(oldStyle, newStyle);
    result->setTimingProperties(delay, duration);
    return result;
}

CSSTransition::CSSTransition(Element& element, CSSPropertyID property, MonotonicTime generationTime, const Animation& backingAnimation, const RenderStyle& targetStyle, const RenderStyle& reversingAdjustedStartStyle, double reversingShorteningFactor)
    : DeclarativeAnimation(element, backingAnimation)
    , m_property(property)
    , m_generationTime(generationTime)
    , m_targetStyle(RenderStyle::clonePtr(targetStyle))
    , m_reversingAdjustedStartStyle(RenderStyle::clonePtr(reversingAdjustedStartStyle))
    , m_reversingShorteningFactor(reversingShorteningFactor)
{
}

void CSSTransition::resolve(RenderStyle& targetStyle)
{
    DeclarativeAnimation::resolve(targetStyle);
    m_currentStyle = RenderStyle::clonePtr(targetStyle);
}

void CSSTransition::setTimingProperties(Seconds delay, Seconds duration)
{
    suspendEffectInvalidation();

    // This method is only called from CSSTransition::create() where we're guaranteed to have an effect.
    auto* animationEffect = effect();
    ASSERT(animationEffect);

    // In order for CSS Transitions to be seeked backwards, they need to have their fill mode set to backwards
    // such that the original CSS value applied prior to the transition is used for a negative current time.
    animationEffect->setFill(FillMode::Backwards);
    animationEffect->setDelay(delay);
    animationEffect->setIterationDuration(duration);
    animationEffect->setTimingFunction(backingAnimation().timingFunction());
    animationEffect->updateStaticTimingProperties();

    unsuspendEffectInvalidation();
}

} // namespace WebCore