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/*
* Copyright (C) 2013 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#ifndef RenderLayerStackingNodeIterator_h
#define RenderLayerStackingNodeIterator_h
#include "wtf/Noncopyable.h"
namespace blink {
enum ChildrenIteration {
NegativeZOrderChildren = 1,
NormalFlowChildren = 1 << 1,
PositiveZOrderChildren = 1 << 2,
AllChildren = NegativeZOrderChildren | NormalFlowChildren | PositiveZOrderChildren
};
class RenderLayerStackingNode;
// This iterator walks the RenderLayerStackingNode lists in the following order:
// NegativeZOrderChildren -> NormalFlowChildren -> PositiveZOrderChildren.
class RenderLayerStackingNodeIterator {
WTF_MAKE_NONCOPYABLE(RenderLayerStackingNodeIterator);
public:
RenderLayerStackingNodeIterator(const RenderLayerStackingNode& root, unsigned whichChildren)
: m_root(root)
, m_remainingChildren(whichChildren)
, m_index(0)
{
}
RenderLayerStackingNode* next();
private:
const RenderLayerStackingNode& m_root;
unsigned m_remainingChildren;
unsigned m_index;
};
// This iterator is similar to RenderLayerStackingNodeIterator but it walks the lists in reverse order
// (from the last item to the first one).
class RenderLayerStackingNodeReverseIterator {
WTF_MAKE_NONCOPYABLE(RenderLayerStackingNodeReverseIterator);
public:
RenderLayerStackingNodeReverseIterator(const RenderLayerStackingNode& root, unsigned whichChildren)
: m_root(root)
, m_remainingChildren(whichChildren)
{
setIndexToLastItem();
}
RenderLayerStackingNode* next();
private:
void setIndexToLastItem();
const RenderLayerStackingNode& m_root;
unsigned m_remainingChildren;
int m_index;
};
} // namespace blink
#endif // RenderLayerStackingNodeIterator_h
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