Source/WebCore/style/PseudoClassChangeInvalidation.h

/*
 * Copyright (C) 2020 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
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 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``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 ITS CONTRIBUTORS
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 */

#pragma once

#include "CSSSelector.h"
#include "Element.h"
#include "StyleInvalidator.h"
#include <wtf/Vector.h>

namespace WebCore {
namespace Style {

class PseudoClassChangeInvalidation {
public:
    PseudoClassChangeInvalidation(Element&, CSSSelector::PseudoClassType, bool value, InvalidationScope = InvalidationScope::All);
    PseudoClassChangeInvalidation(Element&, std::initializer_list<std::pair<CSSSelector::PseudoClassType, bool>>);

    ~PseudoClassChangeInvalidation();

private:
    void computeInvalidation(CSSSelector::PseudoClassType, bool value, Style::InvalidationScope);
    void collectRuleSets(const PseudoClassInvalidationKey&, bool value, InvalidationScope);
    void invalidateBeforeChange();
    void invalidateAfterChange();

    const bool m_isEnabled;
    Element& m_element;

    Invalidator::MatchElementRuleSets m_beforeChangeRuleSets;
    Invalidator::MatchElementRuleSets m_afterChangeRuleSets;
};

Vector<PseudoClassInvalidationKey, 4> makePseudoClassInvalidationKeys(CSSSelector::PseudoClassType, const Element&);

inline void emplace(std::optional<PseudoClassChangeInvalidation>& invalidation, Element& element, std::initializer_list<std::pair<CSSSelector::PseudoClassType, bool>> pseudoClasses)
{
    invalidation.emplace(element, pseudoClasses);
}

inline PseudoClassChangeInvalidation::PseudoClassChangeInvalidation(Element& element, CSSSelector::PseudoClassType pseudoClass, bool value, Style::InvalidationScope invalidationScope)
    : m_isEnabled(element.needsStyleInvalidation())
    , m_element(element)

{
    if (!m_isEnabled)
        return;
    computeInvalidation(pseudoClass, value, invalidationScope);
    invalidateBeforeChange();
}

inline PseudoClassChangeInvalidation::PseudoClassChangeInvalidation(Element& element, std::initializer_list<std::pair<CSSSelector::PseudoClassType, bool>> pseudoClasses)
    : m_isEnabled(element.needsStyleInvalidation())
    , m_element(element)
{
    if (!m_isEnabled)
        return;
    for (auto pseudoClass : pseudoClasses)
        computeInvalidation(pseudoClass.first, pseudoClass.second, Style::InvalidationScope::All);
    invalidateBeforeChange();
}

inline PseudoClassChangeInvalidation::~PseudoClassChangeInvalidation()
{
    if (!m_isEnabled)
        return;
    invalidateAfterChange();
}

}
}