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/*
* Copyright (C) 2024 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 "CustomElementReactionQueue.h"
#include "Element.h"
#include "HTMLNames.h"
#include "MutationObserverInterestGroup.h"
#include "MutationRecord.h"
namespace WebCore {
class StyleAttributeMutationScope {
WTF_MAKE_NONCOPYABLE(StyleAttributeMutationScope);
public:
StyleAttributeMutationScope(Element* element)
: m_element(element)
{
++s_scopeCount;
if (s_scopeCount != 1) {
ASSERT(s_currentScope->m_element == element);
return;
}
ASSERT(!s_currentScope);
s_currentScope = this;
if (!m_element)
return;
bool shouldReadOldValue = false;
m_mutationRecipients = MutationObserverInterestGroup::createForAttributesMutation(*m_element, HTMLNames::styleAttr);
if (m_mutationRecipients && m_mutationRecipients->isOldValueRequested())
shouldReadOldValue = true;
if (UNLIKELY(m_element->isDefinedCustomElement())) {
auto* reactionQueue = m_element->reactionQueue();
if (reactionQueue && reactionQueue->observesStyleAttribute()) {
m_isCustomElement = true;
shouldReadOldValue = true;
}
}
if (shouldReadOldValue)
m_oldValue = m_element->getAttribute(HTMLNames::styleAttr);
}
~StyleAttributeMutationScope()
{
--s_scopeCount;
if (s_scopeCount)
return;
ASSERT(s_currentScope == this);
s_currentScope = nullptr;
if (!m_shouldDeliver || !m_element)
return;
if (m_mutationRecipients) {
auto mutation = MutationRecord::createAttributes(*m_element, HTMLNames::styleAttr, m_oldValue);
m_mutationRecipients->enqueueMutationRecord(WTFMove(mutation));
}
if (m_isCustomElement) {
auto& newValue = m_element->getAttribute(HTMLNames::styleAttr);
CustomElementReactionQueue::enqueueAttributeChangedCallbackIfNeeded(*m_element, HTMLNames::styleAttr, m_oldValue, newValue);
}
}
void enqueueMutationRecord()
{
m_shouldDeliver = true;
}
private:
static unsigned s_scopeCount;
static StyleAttributeMutationScope* s_currentScope;
std::unique_ptr<MutationObserverInterestGroup> m_mutationRecipients;
AtomString m_oldValue;
RefPtr<Element> m_element;
bool m_isCustomElement { false };
bool m_shouldDeliver { false };
};
} // namespace WebCore
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