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/*
* Copyright (C) 2018-2022 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 "FloatingState.h"
#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
#include "LayoutContainingBlockChainIterator.h"
#include "LayoutInitialContainingBlock.h"
#include "LayoutState.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_ISO_ALLOCATED_IMPL(FloatingState);
FloatingState::FloatItem::FloatItem(const Box& layoutBox, BoxGeometry absoluteBoxGeometry)
: m_layoutBox(layoutBox)
, m_position(layoutBox.isLeftFloatingPositioned() ? Position::Left : Position::Right)
, m_absoluteBoxGeometry(absoluteBoxGeometry)
{
}
FloatingState::FloatItem::FloatItem(Position position, BoxGeometry absoluteBoxGeometry)
: m_position(position)
, m_absoluteBoxGeometry(absoluteBoxGeometry)
{
}
FloatingState::FloatingState(LayoutState& layoutState, const ContainerBox& formattingContextRoot)
: m_layoutState(layoutState)
, m_formattingContextRoot(formattingContextRoot)
{
}
void FloatingState::append(FloatItem floatItem)
{
if (m_floats.isEmpty())
return m_floats.append(floatItem);
// The integration codepath does not construct a layout box for the float item.
ASSERT_IMPLIES(floatItem.floatBox(), m_floats.findIf([&] (auto& entry) {
return entry.floatBox() == floatItem.floatBox();
}) == notFound);
auto isLeftPositioned = floatItem.isLeftPositioned();
// When adding a new float item to the list, we have to ensure that it is definitely the left(right)-most item.
// Normally it is, but negative horizontal margins can push the float box beyond another float box.
// Float items in m_floats list should stay in horizontal position order (left/right edge) on the same vertical position.
auto horizontalMargin = floatItem.horizontalMargin();
auto hasNegativeHorizontalMargin = (isLeftPositioned && horizontalMargin.start < 0) || (!isLeftPositioned && horizontalMargin.end < 0);
if (!hasNegativeHorizontalMargin)
return m_floats.append(floatItem);
for (int i = m_floats.size() - 1; i >= 0; --i) {
auto& floatItem = m_floats[i];
if (isLeftPositioned != floatItem.isLeftPositioned())
continue;
if (floatItem.rectWithMargin().top() < floatItem.rectWithMargin().bottom())
continue;
if ((isLeftPositioned && floatItem.rectWithMargin().right() >= floatItem.rectWithMargin().right())
|| (!isLeftPositioned && floatItem.rectWithMargin().left() <= floatItem.rectWithMargin().left()))
return m_floats.insert(i + 1, floatItem);
}
return m_floats.insert(0, floatItem);
}
}
}
#endif
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