FlexFormattingContext.h   [plain text]

/*
 * Copyright (C) 2020 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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#pragma once

#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

#include "FlexFormattingState.h"
#include "FormattingContext.h"
#include <wtf/IsoMalloc.h>

namespace WebCore {
namespace Layout {

class InvalidationState;
// 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(InvalidationState&, const ConstraintsForInFlowContent&) override;
    LayoutUnit usedContentHeight() const override;

    IntrinsicWidthConstraints computedIntrinsicWidthConstraints() override;

private:
    // This class implements positioning and sizing for flex items.
    class Geometry : public FormattingContext::Geometry {
    public:
        Geometry(const FlexFormattingContext&);

        IntrinsicWidthConstraints intrinsicWidthConstraints(const ContainerBox&);

    private:
        const FlexFormattingContext& formattingContext() const { return downcast<FlexFormattingContext>(FormattingContext::Geometry::formattingContext()); }
    };
    FlexFormattingContext::Geometry geometry() const { return Geometry(*this); }

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

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

inline FlexFormattingContext::Geometry::Geometry(const FlexFormattingContext& flexFormattingContext)
    : FormattingContext::Geometry(flexFormattingContext)
{
}

}
}

SPECIALIZE_TYPE_TRAITS_LAYOUT_FORMATTING_CONTEXT(FlexFormattingContext, isFlexFormattingContext())

#endif