// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef LayoutBoxItem_h
#define LayoutBoxItem_h

#include "core/layout/LayoutBox.h"
#include "core/layout/api/LayoutBoxModel.h"
#include "platform/scroll/ScrollTypes.h"

namespace blink {

class LayoutBoxItem : public LayoutBoxModel {
public:
    explicit LayoutBoxItem(LayoutBox* layoutBox)
        : LayoutBoxModel(layoutBox)
    {
    }

    explicit LayoutBoxItem(const LayoutItem& item)
        : LayoutBoxModel(item)
    {
        ASSERT(!item || item.isBox());
    }

    explicit LayoutBoxItem(std::nullptr_t) : LayoutBoxModel(nullptr) { }

    LayoutBoxItem() { }

    LayoutBoxItem enclosingBox() const
    {
        return LayoutBoxItem(toBox()->enclosingBox());
    }

    ScrollResultOneDimensional scroll(ScrollDirectionPhysical direction, ScrollGranularity granularity, float delta = 1)
    {
        return toBox()->scroll(direction, granularity, delta);
    }

private:
    LayoutBox* toBox()
    {
        return toLayoutBox(layoutObject());
    }

    const LayoutBox* toBox() const
    {
        return toLayoutBox(layoutObject());
    }
};

} // namespace blink

#endif // LayoutBoxItem_h