/*
  spanner.hh -- part of GNU LilyPond

  (c) 1996,97 Han-Wen Nienhuys
*/

#ifndef SPANNER_HH
#define SPANNER_HH

#include "lily-proto.hh"
#include "score-elem.hh"



/** a symbol which is attached between two columns. A spanner is a
  symbol which spans across several columns, so its final appearance
  can only be calculated after the breaking problem is solved.

  Examples

  \begin{itemize}
  \item (de)crescendo
  \item slur
  \item beam
  \item bracket
  \end{itemize}
  

  Spanner should know about the items which it should consider:
  e.g. slurs should be steep enough to "enclose" all those items. This
  is absolutely necessary for beams, since they have to adjust the
  length of stems of notes they encompass.

  */
class Spanner:public virtual Score_elem {
public:
    PCol *left_col_l_, *right_col_l_;
    
    /* *************** */
    NAME_MEMBERS();
    virtual Spanner* spanner() { return this; }    
    Spanner();
    bool broken_b() const;
    Spanner* find_broken_piece(Line_of_score*)const;
protected:
    SCORE_ELEM_CLONE(Spanner);
    virtual void break_into_pieces();

    Link_array<Spanner> broken_into_l_arr_;
	
    virtual void do_break_processing();
    virtual Interval do_width()const;
    virtual void do_print()const;
    virtual Line_of_score*line_l()const;
};
#endif
