// -*- mode: c++; c-basic-offset: 4 -*-

/*

 * Copyright (C) 2006 Apple Computer, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#ifndef FrameTree_h

#define FrameTree_h

#include "AtomicString.h"

namespace WebCore {

    class Frame;

    class FrameTree : Noncopyable {

    public:

        FrameTree(Frame* thisFrame, Frame* parentFrame) 

            : m_thisFrame(thisFrame)

            , m_parent(parentFrame)

            , m_previousSibling(0)

            , m_lastChild(0)

            , m_childCount(0)

        {

        }

        ~FrameTree();

        const AtomicString& name() const { return m_name; }

        void setName(const AtomicString&);

        Frame* parent() const { return m_parent; }

        void setParent(Frame* parent) { m_parent = parent; }

        Frame* nextSibling() const { return m_nextSibling.get(); }

        Frame* previousSibling() const { return m_previousSibling; }

        Frame* firstChild() const { return m_firstChild.get(); }

        Frame* lastChild() const { return m_lastChild; }

        unsigned childCount() const { return m_childCount; }

        bool isDescendantOf(const Frame* ancestor) const;

        Frame* traverseNext(const Frame* stayWithin = 0) const;

        Frame* traverseNextWithWrap(bool) const;

        Frame* traversePreviousWithWrap(bool) const;

        void appendChild(PassRefPtr<Frame>);

        void removeChild(Frame*);

        Frame* child(unsigned index) const;

        Frame* child(const AtomicString& name) const;

        Frame* find(const AtomicString& name) const;

        AtomicString uniqueChildName(const AtomicString& requestedName) const;

        Frame* top() const;

    private:

        Frame* deepLastChild() const;

        Frame* m_thisFrame;

        Frame* m_parent;

        AtomicString m_name;

        // FIXME: use ListRefPtr?

        RefPtr<Frame> m_nextSibling;

        Frame* m_previousSibling;

        RefPtr<Frame> m_firstChild;

        Frame* m_lastChild;

        unsigned m_childCount;

    };

} // namespace WebCore

#endif // FrameTree_h