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/*
* Copyright (C) 2020 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 "DisplayBox.h"
#include <wtf/IsoMalloc.h>
#include <wtf/OptionSet.h>
#include <wtf/Vector.h>
namespace WebCore {
namespace Display {
class BoxModelBox;
// Container for a display box and its descendants, for boxes that participate in the CSS stacking
// algorithm <https://www.w3.org/TR/CSS22/zindex.html>, i.e. positioned boxes, and those that create
// CSS stacking context.
class StackingItem {
WTF_MAKE_FAST_ALLOCATED;
friend class TreeBuilder;
public:
using StackingItemList = Vector<std::unique_ptr<StackingItem>>;
explicit StackingItem(std::unique_ptr<BoxModelBox>&&);
void addChildStackingItem(std::unique_ptr<StackingItem>&&);
const BoxModelBox& box() const { return *m_box; }
bool isStackingContext() const;
// Bounds for the painted content of this stacking item (excluding descendant items), not taking clips from ancestors into account.
UnadjustedAbsoluteFloatRect paintedContentBounds() const { return m_paintedContentBounds; }
// Bounds for the painted content of this stacking item and descendant stacking items.
UnadjustedAbsoluteFloatRect paintedBoundsIncludingDescendantItems() const { return m_paintedBoundsIncludingDescendantItems; }
const StackingItemList& negativeZOrderList() const { return m_negativeZOrderList; }
const StackingItemList& positiveZOrderList() const { return m_positiveZOrderList; }
private:
void sortLists();
void setPaintedContentBounds(const UnadjustedAbsoluteFloatRect& bounds) { m_paintedContentBounds = bounds; }
void setPaintedBoundsIncludingDescendantItems(const UnadjustedAbsoluteFloatRect& bounds) { m_paintedBoundsIncludingDescendantItems = bounds; }
std::unique_ptr<BoxModelBox> m_box;
StackingItemList m_negativeZOrderList;
StackingItemList m_positiveZOrderList;
UnadjustedAbsoluteFloatRect m_paintedContentBounds;
UnadjustedAbsoluteFloatRect m_paintedBoundsIncludingDescendantItems;
};
} // namespace Display
} // namespace WebCore
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