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#ifndef INCLUDED_PDFI_TREEVISITING_HXX
#define INCLUDED_PDFI_TREEVISITING_HXX

#include <sal/config.h>
#include <list>


namespace pdfi
{
    class  PDFIProcessor;
    class  StyleContainer;
    struct HyperlinkElement;
    struct TextElement;
    struct ParagraphElement;
    struct FrameElement;
    struct PolyPolyElement;
    struct ImageElement;
    struct PageElement;
    struct DocumentElement;
    struct EmitContext;
    struct Element;

    /** To be visited by all tree element types

        Visitor interface from the "visitor pattern". Implementor gets
        called with actual tree node instances.
     */
    struct ElementTreeVisitor
    {
        virtual void visit( HyperlinkElement&, const std::list< Element* >::const_iterator& ) = 0;
        virtual void visit( TextElement&, const std::list< Element* >::const_iterator&  ) = 0;
        virtual void visit( ParagraphElement&, const std::list< Element* >::const_iterator&  ) = 0;
        virtual void visit( FrameElement&, const std::list< Element* >::const_iterator&  ) = 0;
        virtual void visit( PolyPolyElement&, const std::list< Element* >::const_iterator&  ) = 0;
        virtual void visit( ImageElement&, const std::list< Element* >::const_iterator&  ) = 0;
        virtual void visit( PageElement&, const std::list< Element* >::const_iterator&  ) = 0;
        virtual void visit( DocumentElement&, const std::list< Element* >::const_iterator&  ) = 0;
    };
    typedef boost::shared_ptr<ElementTreeVisitor> ElementTreeVisitorSharedPtr;

    /** Visitee interface

        To be implemented by every tree node that needs to be
        visitable.
     */
    struct ElementTreeVisitable
    {
        virtual void visitedBy( ElementTreeVisitor&, const std::list< Element* >::const_iterator& rParentIt ) = 0;
    };
    typedef boost::shared_ptr<ElementTreeVisitable> ElementTreeVisitableSharedPtr;
}

#endif

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