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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/*
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* Copyright (C) 2008 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_CORE_DOM_NODEWITHINDEX_H_
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#define SKY_ENGINE_CORE_DOM_NODEWITHINDEX_H_
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#include "sky/engine/core/dom/Node.h"
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#include "sky/engine/platform/heap/Handle.h"
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namespace blink {
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// For use when you want to get the index for a node repeatedly and
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// only want to walk the child list to figure out the index once.
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class NodeWithIndex {
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STACK_ALLOCATED();
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public:
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explicit NodeWithIndex(Node& node)
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: m_node(node)
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, m_index(-1)
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{
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}
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Node& node() const { return *m_node; }
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int index() const
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{
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if (!hasIndex())
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m_index = node().nodeIndex();
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ASSERT(hasIndex());
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ASSERT(m_index == static_cast<int>(node().nodeIndex()));
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return m_index;
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}
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private:
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bool hasIndex() const { return m_index >= 0; }
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RawPtr<Node> m_node;
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mutable int m_index;
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};
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}
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#endif // SKY_ENGINE_CORE_DOM_NODEWITHINDEX_H_
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