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/*
* Copyright (C) 2021 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. 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
* 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.
*/
#pragma once
#include "Element.h"
#include "StyleInvalidator.h"
#include "StyleScope.h"
#include <wtf/HashSet.h>
namespace WebCore {
namespace Style {
class ChildChangeInvalidation {
public:
ChildChangeInvalidation(ContainerNode&, const ContainerNode::ChildChange&);
~ChildChangeInvalidation();
static void invalidateAfterFinishedParsingChildren(Element&);
private:
void invalidateForHasBeforeMutation();
void invalidateForHasAfterMutation();
void invalidateAfterChange();
void checkForSiblingStyleChanges();
using MatchingHasSelectors = UncheckedKeyHashSet<const CSSSelector*>;
enum class ChangedElementRelation : uint8_t { SelfOrDescendant, Sibling };
void invalidateForChangedElement(Element&, MatchingHasSelectors&, ChangedElementRelation);
void invalidateForChangeOutsideHasScope();
template<typename Function> void traverseRemovedElements(Function&&);
template<typename Function> void traverseAddedElements(Function&&);
template<typename Function> void traverseRemainingExistingSiblings(Function&&);
Element& parentElement() { return *m_parentElement; }
Element* m_parentElement { nullptr };
const ContainerNode::ChildChange& m_childChange;
const bool m_isEnabled;
const bool m_needsHasInvalidation;
const bool m_wasEmpty;
};
inline ChildChangeInvalidation::ChildChangeInvalidation(ContainerNode& container, const ContainerNode::ChildChange& childChange)
: m_parentElement(dynamicDowncast<Element>(container))
, m_childChange(childChange)
, m_isEnabled(m_parentElement && m_parentElement->needsStyleInvalidation())
, m_needsHasInvalidation(m_isEnabled && Scope::forNode(*m_parentElement).usesHasPseudoClass())
, m_wasEmpty(!container.firstChild())
{
if (!m_isEnabled)
return;
if (m_needsHasInvalidation)
invalidateForHasBeforeMutation();
}
inline ChildChangeInvalidation::~ChildChangeInvalidation()
{
if (!m_isEnabled)
return;
if (m_needsHasInvalidation)
invalidateForHasAfterMutation();
invalidateAfterChange();
}
}
}
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