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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 THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_PAINT_LAYER_STACKING_NODE_ITERATOR_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_PAINT_LAYER_STACKING_NODE_ITERATOR_H_
#include "base/macros.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
namespace blink {
enum ChildrenIteration {
kNegativeZOrderChildren = 1,
// Normal flow children are not mandated by CSS 2.1 but are an artifact of
// our implementation: we allocate PaintLayers for elements that
// are not treated as stacking contexts and thus we need to walk them
// during painting and hit-testing.
kNormalFlowChildren = 1 << 1,
kPositiveZOrderChildren = 1 << 2,
kAllChildren =
kNegativeZOrderChildren | kNormalFlowChildren | kPositiveZOrderChildren
};
class PaintLayerStackingNode;
class PaintLayer;
// This iterator walks the PaintLayerStackingNode lists in the following order:
// NegativeZOrderChildren -> NormalFlowChildren -> PositiveZOrderChildren.
class PaintLayerStackingNodeIterator {
STACK_ALLOCATED();
public:
PaintLayerStackingNodeIterator(const PaintLayerStackingNode& root,
unsigned which_children);
PaintLayer* Next();
private:
const PaintLayerStackingNode& root_;
unsigned remaining_children_;
unsigned index_;
PaintLayer* current_normal_flow_child_;
DISALLOW_COPY_AND_ASSIGN(PaintLayerStackingNodeIterator);
};
// This iterator is similar to PaintLayerStackingNodeIterator but it walks the
// lists in reverse order (from the last item to the first one).
class PaintLayerStackingNodeReverseIterator {
STACK_ALLOCATED();
public:
PaintLayerStackingNodeReverseIterator(const PaintLayerStackingNode& root,
unsigned which_children)
: root_(root), remaining_children_(which_children) {
SetIndexToLastItem();
}
PaintLayer* Next();
private:
void SetIndexToLastItem();
const PaintLayerStackingNode& root_;
unsigned remaining_children_;
int index_;
PaintLayer* current_normal_flow_child_;
DISALLOW_COPY_AND_ASSIGN(PaintLayerStackingNodeReverseIterator);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAINT_PAINT_LAYER_STACKING_NODE_ITERATOR_H_
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