Source/core/animation/Animation.cpp

/*
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#include "config.h"
#include "core/animation/Animation.h"

#include "core/animation/ActiveAnimations.h"
#include "core/animation/Player.h"
#include "core/dom/Element.h"

namespace WebCore {

PassRefPtr<Animation> Animation::create(PassRefPtr<Element> target, PassRefPtr<AnimationEffect> effect, const Timing& timing, Priority priority, PassOwnPtr<EventDelegate> eventDelegate)
{
    return adoptRef(new Animation(target, effect, timing, priority, eventDelegate));
}

Animation::Animation(PassRefPtr<Element> target, PassRefPtr<AnimationEffect> effect, const Timing& timing, Priority priority, PassOwnPtr<EventDelegate> eventDelegate)
    : TimedItem(timing, eventDelegate)
    , m_target(target)
    , m_effect(effect)
    , m_activeInAnimationStack(false)
    , m_priority(priority)
{
}

void Animation::willDetach()
{
    if (m_activeInAnimationStack)
        clearEffects();
}

static AnimationStack& ensureAnimationStack(Element* element)
{
    return element->ensureActiveAnimations()->defaultStack();
}

void Animation::applyEffects(bool previouslyInEffect)
{
    ASSERT(player());
    if (!m_target || !m_effect)
        return;

    if (!previouslyInEffect) {
        ensureAnimationStack(m_target.get()).add(this);
        m_activeInAnimationStack = true;
    }

    m_compositableValues = m_effect->sample(currentIteration(), timeFraction());
    m_target->setNeedsStyleRecalc(LocalStyleChange, StyleChangeFromRenderer);
}

void Animation::clearEffects()
{
    ASSERT(player());
    ASSERT(m_activeInAnimationStack);
    ensureAnimationStack(m_target.get()).remove(this);
    m_activeInAnimationStack = false;
    m_compositableValues.clear();
    m_target->setNeedsStyleRecalc(LocalStyleChange, StyleChangeFromRenderer);
}

void Animation::updateChildrenAndEffects() const
{
    if (!m_effect)
        return;

    if (isInEffect())
        const_cast<Animation*>(this)->applyEffects(m_activeInAnimationStack);
    else if (m_activeInAnimationStack)
        const_cast<Animation*>(this)->clearEffects();
}

double Animation::calculateTimeToEffectChange(double inheritedTime, double activeTime, Phase phase) const
{
    switch (phase) {
    case PhaseBefore:
        return activeTime - inheritedTime;
    case PhaseActive:
        return 0;
    case PhaseAfter:
        // If this Animation is still in effect then it will need to update
        // when its parent goes out of effect. We have no way of knowing when
        // that will be, however, so the parent will need to supply it.
        return std::numeric_limits<double>::infinity();
    case PhaseNone:
    default:
        ASSERT_NOT_REACHED();
        return 0;
    }
}

} // namespace WebCore