97 lines
3.9 KiB
C++
97 lines
3.9 KiB
C++
/*
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* Copyright (C) 2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "FloatingState.h"
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#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
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#include "FormattingContext.h"
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#include "LayoutBox.h"
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#include "LayoutContainerBox.h"
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#include "LayoutState.h"
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#include "RuntimeEnabledFeatures.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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namespace Layout {
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WTF_MAKE_ISO_ALLOCATED_IMPL(FloatingState);
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FloatingState::FloatItem::FloatItem(const Box& layoutBox, BoxGeometry absoluteBoxGeometry)
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: m_layoutBox(makeWeakPtr(layoutBox))
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, m_position(layoutBox.isLeftFloatingPositioned() ? Position::Left : Position::Right)
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, m_absoluteBoxGeometry(absoluteBoxGeometry)
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{
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}
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FloatingState::FloatItem::FloatItem(Position position, BoxGeometry absoluteBoxGeometry)
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: m_position(position)
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, m_absoluteBoxGeometry(absoluteBoxGeometry)
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{
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}
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FloatingState::FloatingState(LayoutState& layoutState, const ContainerBox& formattingContextRoot)
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: m_layoutState(layoutState)
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, m_formattingContextRoot(makeWeakPtr(formattingContextRoot))
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{
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}
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void FloatingState::append(FloatItem floatItem)
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{
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if (m_floats.isEmpty())
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return m_floats.append(floatItem);
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// The integration codepath does not construct a layout box for the float item.
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ASSERT_IMPLIES(floatItem.floatBox(), m_floats.findMatching([&] (auto& entry) {
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return entry.floatBox() == floatItem.floatBox();
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}) == notFound);
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auto isLeftPositioned = floatItem.isLeftPositioned();
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// When adding a new float item to the list, we have to ensure that it is definitely the left(right)-most item.
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// Normally it is, but negative horizontal margins can push the float box beyond another float box.
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// Float items in m_floats list should stay in horizontal position order (left/right edge) on the same vertical position.
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auto horizontalMargin = floatItem.horizontalMargin();
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auto hasNegativeHorizontalMargin = (isLeftPositioned && horizontalMargin.start < 0) || (!isLeftPositioned && horizontalMargin.end < 0);
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if (!hasNegativeHorizontalMargin)
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return m_floats.append(floatItem);
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for (int i = m_floats.size() - 1; i >= 0; --i) {
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auto& floatItem = m_floats[i];
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if (isLeftPositioned != floatItem.isLeftPositioned())
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continue;
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if (floatItem.rectWithMargin().top() < floatItem.rectWithMargin().bottom())
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continue;
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if ((isLeftPositioned && floatItem.rectWithMargin().right() >= floatItem.rectWithMargin().right())
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|| (!isLeftPositioned && floatItem.rectWithMargin().left() <= floatItem.rectWithMargin().left()))
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return m_floats.insert(i + 1, floatItem);
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}
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return m_floats.insert(0, floatItem);
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}
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}
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}
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#endif
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