Source/WebCore/animation/CSSTransition.cpp

/*
 * Copyright (C) 2018 Apple Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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#include "config.h"
#include "CSSTransition.h"

#include "Animation.h"
#include "Element.h"
#include "KeyframeEffectReadOnly.h"

namespace WebCore {

Ref<CSSTransition> CSSTransition::create(Element& target, CSSPropertyID property, const Animation& backingAnimation, const RenderStyle* oldStyle, const RenderStyle& newStyle)
{
    auto result = adoptRef(*new CSSTransition(target, property, backingAnimation));
    result->initialize(target, oldStyle, newStyle);
    return result;
}

CSSTransition::CSSTransition(Element& element, CSSPropertyID property, const Animation& backingAnimation)
    : DeclarativeAnimation(element, backingAnimation)
    , m_property(property)
{
}

void CSSTransition::initialize(const Element& target, const RenderStyle* oldStyle, const RenderStyle& newStyle)
{
    DeclarativeAnimation::initialize(target, oldStyle, newStyle);

    suspendEffectInvalidation();

    // 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.
    effect()->timing()->setFill(FillMode::Backwards);

    unsuspendEffectInvalidation();
}

bool CSSTransition::matchesBackingAnimationAndStyles(const Animation& newBackingAnimation, const RenderStyle* oldStyle, const RenderStyle& newStyle) const
{
    // See if the animations match, excluding the property since we can move from an "all" transition to an explicit property transition.
    bool backingAnimationsMatch = backingAnimation().animationsMatch(newBackingAnimation, false);
    if (!oldStyle || !effect())
        return backingAnimationsMatch;
    return backingAnimationsMatch && !downcast<KeyframeEffectReadOnly>(effect())->stylesWouldYieldNewCSSTransitionsBlendingKeyframes(*oldStyle, newStyle);
}

bool CSSTransition::canBeListed() const
{
    if (!downcast<KeyframeEffectReadOnly>(effect())->hasBlendingKeyframes())
        return false;
    return WebAnimation::canBeListed();
}

} // namespace WebCore