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/*
* Copyright (C) 2021 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 "MarginTypes.h"
namespace WebCore {
namespace Layout {
class BlockFormattingGeometry;
class BlockFormattingState;
class ElementBox;
class LayoutState;
// This class implements margin collapsing for block formatting context.
class BlockMarginCollapse {
public:
BlockMarginCollapse(const LayoutState&, const BlockFormattingState&);
UsedVerticalMargin collapsedVerticalValues(const ElementBox&, UsedVerticalMargin::NonCollapsedValues);
LayoutUnit marginBeforeIgnoringCollapsingThrough(const ElementBox&, UsedVerticalMargin::NonCollapsedValues);
bool marginBeforeCollapsesWithParentMarginBefore(const ElementBox&) const;
bool marginBeforeCollapsesWithFirstInFlowChildMarginBefore(const ElementBox&) const;
bool marginBeforeCollapsesWithParentMarginAfter(const ElementBox&) const;
bool marginBeforeCollapsesWithPreviousSiblingMarginAfter(const ElementBox&) const;
bool marginAfterCollapsesWithParentMarginAfter(const ElementBox&) const;
bool marginAfterCollapsesWithLastInFlowChildMarginAfter(const ElementBox&) const;
bool marginAfterCollapsesWithParentMarginBefore(const ElementBox&) const;
bool marginAfterCollapsesWithNextSiblingMarginBefore(const ElementBox&) const;
bool marginAfterCollapsesWithSiblingMarginBeforeWithClearance(const ElementBox&) const;
UsedVerticalMargin::PositiveAndNegativePair::Values computedPositiveAndNegativeMargin(UsedVerticalMargin::PositiveAndNegativePair::Values, UsedVerticalMargin::PositiveAndNegativePair::Values) const;
bool marginsCollapseThrough(const ElementBox&) const;
PrecomputedMarginBefore precomputedMarginBefore(const ElementBox&, UsedVerticalMargin::NonCollapsedValues, const BlockFormattingGeometry&);
private:
enum class MarginType { Before, After };
UsedVerticalMargin::PositiveAndNegativePair::Values positiveNegativeValues(const ElementBox&, MarginType) const;
UsedVerticalMargin::PositiveAndNegativePair::Values positiveNegativeMarginBefore(const ElementBox&, UsedVerticalMargin::NonCollapsedValues) const;
UsedVerticalMargin::PositiveAndNegativePair::Values positiveNegativeMarginAfter(const ElementBox&, UsedVerticalMargin::NonCollapsedValues) const;
UsedVerticalMargin::PositiveAndNegativePair::Values precomputedPositiveNegativeMarginBefore(const ElementBox&, UsedVerticalMargin::NonCollapsedValues, const BlockFormattingGeometry&) const;
UsedVerticalMargin::PositiveAndNegativePair::Values precomputedPositiveNegativeValues(const ElementBox&, const BlockFormattingGeometry&) const;
std::optional<LayoutUnit> marginValue(UsedVerticalMargin::PositiveAndNegativePair::Values) const;
bool hasClearance(const ElementBox&) const;
bool inQuirksMode() const { return m_inQuirksMode; }
const LayoutState& layoutState() const { return m_layoutState; }
const BlockFormattingState& formattingState() const { return m_blockFormattingState; }
const LayoutState& m_layoutState;
const BlockFormattingState& m_blockFormattingState;
bool m_inQuirksMode { false };
};
}
}
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