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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef StyleResolverParentScope_h
#define StyleResolverParentScope_h
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/dom/shadow/ShadowRoot.h"
namespace blink {
// Maintains the parent element stack (and bloom filter) inside recalcStyle.
class StyleResolverParentScope final {
STACK_ALLOCATED();
public:
explicit StyleResolverParentScope(Node& parent);
~StyleResolverParentScope();
static void ensureParentStackIsPushed();
private:
void pushParentIfNeeded();
Node& parent() const { return *m_parent; }
RawPtrWillBeMember<Node> m_parent;
bool m_pushed;
StyleResolverParentScope* m_previous;
StyleResolver& m_resolver;
static StyleResolverParentScope* s_currentScope;
};
inline StyleResolverParentScope::StyleResolverParentScope(Node& parent)
: m_parent(parent)
, m_pushed(false)
, m_previous(s_currentScope)
, m_resolver(*parent.document().styleResolver())
{
ASSERT(parent.document().inStyleRecalc());
ASSERT(parent.isElementNode() || parent.isShadowRoot());
s_currentScope = this;
m_resolver.increaseStyleSharingDepth();
}
inline StyleResolverParentScope::~StyleResolverParentScope()
{
s_currentScope = m_previous;
m_resolver.decreaseStyleSharingDepth();
if (!m_pushed)
return;
if (parent().isElementNode())
m_resolver.popParentElement(toElement(parent()));
}
inline void StyleResolverParentScope::ensureParentStackIsPushed()
{
if (s_currentScope)
s_currentScope->pushParentIfNeeded();
}
inline void StyleResolverParentScope::pushParentIfNeeded()
{
if (m_pushed)
return;
if (m_previous)
m_previous->pushParentIfNeeded();
if (parent().isElementNode())
m_resolver.pushParentElement(toElement(parent()));
m_pushed = true;
}
} // namespace blink
#endif // StyleResolverParentScope_h
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