Source/WebCore/layout/layouttree/LayoutContainer.h

/*
 * Copyright (C) 2018 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

#if ENABLE(LAYOUT_FORMATTING_CONTEXT)

#include "LayoutBox.h"
#include <wtf/IsoMalloc.h>
#include <wtf/WeakPtr.h>

namespace WebCore {

class RenderStyle;

namespace Layout {

class Container : public Box {
    WTF_MAKE_ISO_ALLOCATED(Container);
public:
    friend class TreeBuilder;

    const Box* firstChild() const { return m_firstChild; }
    const Box* firstInFlowChild() const;
    const Box* firstInFlowOrFloatingChild() const;
    const Box* lastChild() const { return m_lastChild; }
    const Box* lastInFlowChild() const;
    const Box* lastInFlowOrFloatingChild() const;

    bool hasChild() const { return firstChild(); }
    bool hasInFlowChild() const { return firstInFlowChild(); }
    bool hasInFlowOrFloatingChild() const { return firstInFlowOrFloatingChild(); }

    const Vector<WeakPtr<Box>>& outOfFlowDescendants() { return m_outOfFlowDescendants; }

protected:
    Container(RenderStyle&&, BaseTypeFlags);

private:
    void setFirstChild(Box&);
    void setLastChild(Box&);
    void setOutOfFlowDescendants(Vector<WeakPtr<Box>>&&);

    Box* m_firstChild { nullptr };
    Box* m_lastChild { nullptr };
    Vector<WeakPtr<Box>> m_outOfFlowDescendants;
};

}
}

SPECIALIZE_TYPE_TRAITS_LAYOUT_BOX(Container, isContainer())

#endif