97 lines
4.3 KiB
C++
97 lines
4.3 KiB
C++
/*
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* Copyright (C) 2011 Google 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 are
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* met:
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*
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* * 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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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "FlexibleBoxAlgorithm.h"
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#include "RenderBox.h"
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namespace WebCore {
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FlexItem::FlexItem(RenderBox& box, LayoutUnit flexBaseContentSize, LayoutUnit mainAxisBorderAndPadding, LayoutUnit mainAxisMargin, std::pair<LayoutUnit, LayoutUnit> minMaxSizes, bool everHadLayout)
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: box(box)
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, flexBaseContentSize(flexBaseContentSize)
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, mainAxisBorderAndPadding(mainAxisBorderAndPadding)
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, mainAxisMargin(mainAxisMargin)
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, minMaxSizes(minMaxSizes)
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, hypotheticalMainContentSize(constrainSizeByMinMax(flexBaseContentSize))
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, frozen(false)
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, everHadLayout(everHadLayout)
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{
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ASSERT(!box.isOutOfFlowPositioned());
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}
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FlexLayoutAlgorithm::FlexLayoutAlgorithm(const RenderStyle& style, LayoutUnit lineBreakLength, const Vector<FlexItem>& allItems, LayoutUnit gapBetweenItems, LayoutUnit gapBetweenLines)
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: m_style(style)
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, m_lineBreakLength(lineBreakLength)
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, m_allItems(allItems)
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, m_gapBetweenItems(gapBetweenItems)
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, m_gapBetweenLines(gapBetweenLines)
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{
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}
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bool FlexLayoutAlgorithm::computeNextFlexLine(size_t& nextIndex, Vector<FlexItem>& lineItems, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize)
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{
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lineItems.clear();
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sumFlexBaseSize = 0_lu;
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totalFlexGrow = totalFlexShrink = totalWeightedFlexShrink = 0;
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sumHypotheticalMainSize = 0_lu;
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for (; nextIndex < m_allItems.size(); ++nextIndex) {
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const auto& flexItem = m_allItems[nextIndex];
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ASSERT(!flexItem.box.isOutOfFlowPositioned());
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if (isMultiline() && sumHypotheticalMainSize + flexItem.hypotheticalMainAxisMarginBoxSize() > m_lineBreakLength && !lineItems.isEmpty())
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break;
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lineItems.append(flexItem);
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sumFlexBaseSize += flexItem.flexBaseMarginBoxSize() + m_gapBetweenItems;
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totalFlexGrow += flexItem.box.style().flexGrow();
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totalFlexShrink += flexItem.box.style().flexShrink();
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totalWeightedFlexShrink += flexItem.box.style().flexShrink() * flexItem.flexBaseContentSize;
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sumHypotheticalMainSize += flexItem.hypotheticalMainAxisMarginBoxSize() + m_gapBetweenItems;
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}
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if (!lineItems.isEmpty()) {
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// We added a gap after every item but there shouldn't be one after the last item, so subtract it here. Note that
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// sums might be negative here due to negative margins in flex items.
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sumHypotheticalMainSize -= m_gapBetweenItems;
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sumFlexBaseSize -= m_gapBetweenItems;
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}
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ASSERT(lineItems.size() > 0 || nextIndex == m_allItems.size());
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return lineItems.size() > 0;
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}
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LayoutUnit FlexItem::constrainSizeByMinMax(const LayoutUnit size) const
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{
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return std::max(minMaxSizes.first, std::min(size, minMaxSizes.second));
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}
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} // namespace WebCore
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