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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.
*/
#include "config.h"
#include "DisplayStackingItem.h"
#include "DisplayBoxModelBox.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
namespace Display {
StackingItem::StackingItem(std::unique_ptr<BoxModelBox>&& box)
: m_box(WTFMove(box))
{
ASSERT(m_box);
}
bool StackingItem::isStackingContext() const
{
return m_box->style().isStackingContext();
}
void StackingItem::addChildStackingItem(std::unique_ptr<StackingItem>&& item)
{
auto zIndex = item->box().style().zIndex().value_or(0);
if (zIndex < 0)
m_negativeZOrderList.append(WTFMove(item));
else
m_positiveZOrderList.append(WTFMove(item));
}
void StackingItem::sortLists()
{
auto compareZIndex = [](const std::unique_ptr<StackingItem>& a, const std::unique_ptr<StackingItem>& b) {
return a->box().style().zIndex().value_or(0) < b->box().style().zIndex().value_or(0);
};
std::stable_sort(m_positiveZOrderList.begin(), m_positiveZOrderList.end(), compareZIndex);
std::stable_sort(m_negativeZOrderList.begin(), m_negativeZOrderList.end(), compareZIndex);
}
} // namespace Display
} // namespace WebCore
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