97 lines
3.6 KiB
C++
97 lines
3.6 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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#pragma once
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#include "LayoutUnit.h"
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#include "RenderStyle.h"
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#include <wtf/Forward.h>
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#include <wtf/Noncopyable.h>
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namespace WebCore {
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class RenderBox;
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class FlexItem {
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public:
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FlexItem(RenderBox&, LayoutUnit flexBaseContentSize, LayoutUnit mainAxisBorderAndPadding, LayoutUnit mainAxisMargin, std::pair<LayoutUnit, LayoutUnit> minMaxSizes, bool everHadLayout);
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LayoutUnit hypotheticalMainAxisMarginBoxSize() const
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{
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return hypotheticalMainContentSize + mainAxisBorderAndPadding + mainAxisMargin;
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}
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LayoutUnit flexBaseMarginBoxSize() const
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{
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return flexBaseContentSize + mainAxisBorderAndPadding + mainAxisMargin;
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}
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LayoutUnit flexedMarginBoxSize() const
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{
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return flexedContentSize + mainAxisBorderAndPadding + mainAxisMargin;
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}
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LayoutUnit constrainSizeByMinMax(const LayoutUnit) const;
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RenderBox& box;
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const LayoutUnit flexBaseContentSize;
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const LayoutUnit mainAxisBorderAndPadding;
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const LayoutUnit mainAxisMargin;
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const std::pair<LayoutUnit, LayoutUnit> minMaxSizes;
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const LayoutUnit hypotheticalMainContentSize;
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LayoutUnit flexedContentSize;
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bool frozen { false };
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bool everHadLayout { false };
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};
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class FlexLayoutAlgorithm {
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WTF_MAKE_NONCOPYABLE(FlexLayoutAlgorithm);
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public:
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FlexLayoutAlgorithm(const RenderStyle&, LayoutUnit lineBreakLength, const Vector<FlexItem>& allItems, LayoutUnit gapBetweenItems, LayoutUnit gapBetweenLines);
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// The hypothetical main size of an item is the flex base size clamped
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// according to its min and max main size properties
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bool computeNextFlexLine(size_t& nextIndex, Vector<FlexItem>& lineItems, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize);
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private:
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bool isMultiline() const { return m_style.flexWrap() != FlexWrap::NoWrap; }
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const RenderStyle& m_style;
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LayoutUnit m_lineBreakLength;
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const Vector<FlexItem>& m_allItems;
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const LayoutUnit m_gapBetweenItems;
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const LayoutUnit m_gapBetweenLines;
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};
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} // namespace WebCore
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