Source/WebCore/layout/formattingContexts/flex/FlexFormattingContext.h

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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#pragma once

#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

#include "FlexFormattingGeometry.h"
#include "FlexFormattingState.h"
#include "FormattingQuirks.h"
#include <wtf/IsoMalloc.h>

namespace WebCore {
namespace Layout {

// This class implements the layout logic for flex formatting contexts.
// https://www.w3.org/TR/css-flexbox-1/
class FlexFormattingContext final : public FormattingContext {
    WTF_MAKE_ISO_ALLOCATED(FlexFormattingContext);
public:
    FlexFormattingContext(const ContainerBox& formattingContextRoot, FlexFormattingState&);
    void layoutInFlowContent(const ConstraintsForInFlowContent&) override;
    LayoutUnit usedContentHeight() const override;

    IntrinsicWidthConstraints computedIntrinsicWidthConstraints() override;

    const FlexFormattingGeometry& formattingGeometry() const final { return m_flexFormattingGeometry; }
    const FormattingQuirks& formattingQuirks() const final { return m_flexFormattingQuirks; }

private:
    void sizeAndPlaceFlexItems(const ConstraintsForInFlowContent&);
    void computeIntrinsicWidthConstraintsForFlexItems();

    const FlexFormattingState& formattingState() const { return downcast<FlexFormattingState>(FormattingContext::formattingState()); }
    FlexFormattingState& formattingState() { return downcast<FlexFormattingState>(FormattingContext::formattingState()); }

    const FlexFormattingGeometry m_flexFormattingGeometry;
    const FormattingQuirks m_flexFormattingQuirks;
};

}
}

SPECIALIZE_TYPE_TRAITS_LAYOUT_FORMATTING_CONTEXT(FlexFormattingContext, isFlexFormattingContext())

#endif