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/*
* Copyright (C) 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.
*/
#pragma once
#include "FlexFormattingConstraints.h"
#include "FlexFormattingState.h"
#include "FlexRect.h"
#include "LogicalFlexItem.h"
#include <wtf/Range.h>
namespace WebCore {
namespace Layout {
class FlexFormattingContext;
struct FlexBaseAndHypotheticalMainSize;
struct PositionAndMargins;
// This class implements the layout logic for flex formatting contexts.
// https://www.w3.org/TR/css-flexbox-1/
class FlexLayout {
public:
FlexLayout(const FlexFormattingContext&);
using LogicalFlexItems = Vector<LogicalFlexItem>;
struct LogicalConstraints {
struct AxisGeometry {
std::optional<LayoutUnit> definiteSize;
std::optional<LayoutUnit> minimumSize;
std::optional<LayoutUnit> maximumSize;
std::optional<LayoutUnit> minimumContentSize;
std::optional<LayoutUnit> maximumContentSize;
LayoutUnit availableSize; // space available to the flex container minus margin, border, and padding.
};
AxisGeometry mainAxis;
AxisGeometry crossAxis;
};
using LogicalFlexItemRects = FixedVector<FlexRect>;
LogicalFlexItemRects layout(const LogicalConstraints&, const LogicalFlexItems&);
private:
using FlexBaseAndHypotheticalMainSizeList = Vector<FlexBaseAndHypotheticalMainSize>;
using LineRanges = Vector<WTF::Range<size_t>>;
using SizeList = FixedVector<LayoutUnit>;
using PositionAndMarginsList = FixedVector<PositionAndMargins>;
using LinesCrossSizeList = Vector<LayoutUnit>;
using LinesCrossPositionList = Vector<LayoutUnit>;
void computeAvailableMainAndCrossSpace(const LogicalConstraints&);
FlexBaseAndHypotheticalMainSizeList flexBaseAndHypotheticalMainSizeForFlexItems(const LogicalConstraints::AxisGeometry& mainAxis, const LogicalFlexItems&) const;
LayoutUnit flexContainerMainSize(const LogicalConstraints::AxisGeometry& mainAxis) const;
LineRanges computeFlexLines(const LogicalFlexItems&, LayoutUnit flexContainerMainSize, const FlexBaseAndHypotheticalMainSizeList&) const;
SizeList computeMainSizeForFlexItems(const LogicalFlexItems&, const LineRanges&, LayoutUnit flexContainerMainSize, const FlexBaseAndHypotheticalMainSizeList&) const;
SizeList hypotheticalCrossSizeForFlexItems(const LogicalFlexItems&, const SizeList& flexItemsMainSizeList) const;
LinesCrossSizeList crossSizeForFlexLines(const LineRanges&, const LogicalConstraints::AxisGeometry& crossAxis, const LogicalFlexItems&, const SizeList& flexItemsHypotheticalCrossSizeList) const;
void stretchFlexLines(LinesCrossSizeList& flexLinesCrossSizeList, size_t numberOfLines, const LogicalConstraints::AxisGeometry& crossAxis) const;
bool collapseNonVisibleFlexItems();
SizeList computeCrossSizeForFlexItems(const LogicalFlexItems&, const LineRanges&, const LinesCrossSizeList& flexLinesCrossSizeList, const SizeList& flexItemsHypotheticalCrossSizeList) const;
PositionAndMarginsList handleMainAxisAlignment(LayoutUnit availableMainSpace, const LineRanges&, const LogicalFlexItems&, const SizeList& flexItemsMainSizeList) const;
PositionAndMarginsList handleCrossAxisAlignmentForFlexItems(const LogicalFlexItems&, const LineRanges&, const SizeList& flexItemsCrossSizeList, const LinesCrossSizeList& flexLinesCrossSizeList) const;
LinesCrossPositionList handleCrossAxisAlignmentForFlexLines(const LogicalConstraints::AxisGeometry& crossAxis, const LineRanges&, LinesCrossSizeList& flexLinesCrossSizeList) const;
LayoutUnit maxContentForFlexItem(const LogicalFlexItem&) const;
bool isSingleLineFlexContainer() const { return flexContainer().style().flexWrap() == FlexWrap::NoWrap; }
const ElementBox& flexContainer() const;
const FlexFormattingContext& flexFormattingContext() const;
const RenderStyle& flexContainerStyle() const { return flexContainer().style(); }
private:
const FlexFormattingContext& m_flexFormattingContext;
LayoutUnit m_availableMainSpace;
LayoutUnit m_availableCrossSpace;
};
}
}
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