blob: 7ce2a9cba1a958da7d8556e2da85e8d889100ba4 [file] [log] [blame]
/*
* Copyright (C) 2015 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 "RenderElement.h"
namespace WebCore {
class RenderTreePosition {
public:
explicit RenderTreePosition(RenderElement& parent)
: m_parent(parent)
{
}
RenderTreePosition(RenderElement& parent, RenderObject* nextSibling)
: m_parent(parent)
, m_nextSibling(nextSibling)
, m_hasValidNextSibling(true)
{
}
RenderElement& parent() const { return m_parent; }
RenderObject* nextSibling() const { ASSERT(m_hasValidNextSibling); return m_nextSibling.get(); }
void computeNextSibling(const Node&);
void moveToLastChild();
void invalidateNextSibling() { m_hasValidNextSibling = false; }
void invalidateNextSibling(const RenderObject&);
RenderObject* nextSiblingRenderer(const Node&) const;
private:
RenderElement& m_parent;
WeakPtr<RenderObject> m_nextSibling { nullptr };
bool m_hasValidNextSibling { false };
#if ASSERT_ENABLED
unsigned m_assertionLimitCounter { 0 };
#endif
};
inline void RenderTreePosition::moveToLastChild()
{
m_nextSibling = nullptr;
m_hasValidNextSibling = true;
}
} // namespace WebCore