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/*
* Copyright (C) 2011 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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.
*/
#pragma once
#include "LayoutUnit.h"
#include "RenderFlexibleBox.h"
#include <wtf/Forward.h>
#include <wtf/Noncopyable.h>
namespace WebCore {
class RenderBox;
class FlexLayoutItem {
public:
FlexLayoutItem(RenderBox&, LayoutUnit flexBaseContentSize, LayoutUnit mainAxisBorderAndPadding, LayoutUnit mainAxisMargin, std::pair<LayoutUnit, LayoutUnit> minMaxSizes, bool everHadLayout);
LayoutUnit hypotheticalMainAxisMarginBoxSize() const
{
return hypotheticalMainContentSize + mainAxisBorderAndPadding + mainAxisMargin;
}
LayoutUnit flexBaseMarginBoxSize() const
{
return flexBaseContentSize + mainAxisBorderAndPadding + mainAxisMargin;
}
LayoutUnit flexedMarginBoxSize() const
{
return flexedContentSize + mainAxisBorderAndPadding + mainAxisMargin;
}
const RenderStyle& style() const { return renderer->style(); }
LayoutUnit constrainSizeByMinMax(const LayoutUnit) const;
CheckedRef<RenderBox> renderer;
LayoutUnit flexBaseContentSize;
const LayoutUnit mainAxisBorderAndPadding;
mutable LayoutUnit mainAxisMargin;
const std::pair<LayoutUnit, LayoutUnit> minMaxSizes;
const LayoutUnit hypotheticalMainContentSize;
LayoutUnit flexedContentSize;
bool frozen { false };
bool everHadLayout { false };
};
class FlexLayoutAlgorithm {
WTF_MAKE_NONCOPYABLE(FlexLayoutAlgorithm);
public:
FlexLayoutAlgorithm(RenderFlexibleBox&, LayoutUnit lineBreakLength, const Vector<FlexLayoutItem>& allItems, LayoutUnit gapBetweenItems, LayoutUnit gapBetweenLines);
// The hypothetical main size of an item is the flex base size clamped
// according to its min and max main size properties
bool computeNextFlexLine(size_t& nextIndex, Vector<FlexLayoutItem>& lineItems, LayoutUnit& sumFlexBaseSize, double& totalFlexGrow, double& totalFlexShrink, double& totalWeightedFlexShrink, LayoutUnit& sumHypotheticalMainSize);
private:
bool isMultiline() const { return m_flexbox.style().flexWrap() != FlexWrap::NoWrap; }
bool canFitItemWithTrimmedMarginEnd(const FlexLayoutItem&, LayoutUnit sumHypotheticalMainSize) const;
void removeMarginEndFromFlexSizes(FlexLayoutItem&, LayoutUnit& sumFlexBaseSize, LayoutUnit& sumHypotheticalMainSize) const;
RenderFlexibleBox& m_flexbox;
LayoutUnit m_lineBreakLength;
const Vector<FlexLayoutItem>& m_allItems;
const LayoutUnit m_gapBetweenItems;
const LayoutUnit m_gapBetweenLines;
};
} // namespace WebCore
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