hdr/staff-elem.hh

   1 /*
   2   staff-elem.hh -- part of LilyPond
   3
   4   (c) 1996,97 Han-Wen Nienhuys
   5 */
   6
   7 #ifndef STAFFELEM_HH
   8 #define STAFFELEM_HH
   9 #include "varray.hh"
  10 #include "proto.hh"
  11 #include "offset.hh"
  12 #include "molecule.hh"
  13 #include "class-name.hh"
  14
  15
  16 /** Both Spanner and Item are Staff_elem's. Most Staff_elem's depend
  17   on other Staff_elem's, eg, Beam needs to know and set direction of
  18   Stem. So the Beam has to be calculated *before* Stem. This is
  19   accomplished with the dependencies field of struct Staff_elem.
  20
  21   */
  22 struct Staff_elem {
  23     enum Status {
  24         ORPHAN,                 // not yet added to pstaff
  25         VIRGIN,                 // added to pstaff
  26         PRECALCING,
  27         PRECALCED,              // calcs before spacing done
  28         POSTCALCING,
  29         POSTCALCED,             // after spacing calcs done
  30         OUTPUT,                 // molecule has been output
  31     } status;
  32
  33     ///  the pstaff it is in
  34     PStaff *pstaff_l_;
  35
  36     /* *************** */
  37     Staff_elem(Staff_elem const&);
  38     String TeXstring () const ;
  39     virtual void print() const;
  40     virtual Interval width() const;
  41     virtual Interval height() const;
  42     Paper_def *paper() const;
  43     virtual ~Staff_elem();
  44     Staff_elem();
  45     NAME_MEMBERS(Staff_elem);
  46     void translate(Offset);
  47     void add_processing();
  48     void pre_processing();
  49     void post_processing();
  50     void molecule_processing();
  51
  52     virtual Spanner* spanner()  { return 0; }
  53     virtual Item * item() { return 0; }
  54     void add_dependency(Staff_elem* );
  55     void substitute_dependency(Staff_elem* old, Staff_elem * newdep);
  56
  57 protected:
  58
  59     /// do printing of derived info.
  60     virtual void do_print() const=0;
  61     /// generate the molecule
  62     virtual Molecule* brew_molecule_p()const=0;
  63     ///executed directly after the item is added to the PScore
  64     virtual void do_add_processing();
  65     /// do calculations before determining horizontal spacing
  66     virtual void do_pre_processing();
  67
  68     /// do calculations after determining horizontal spacing
  69     virtual void do_post_processing();
  70
  71     Array<Staff_elem*> dependants;
  72
  73 private:
  74     /// member: the symbols
  75     Molecule *output;           // should scrap, and use temp var?
  76
  77
  78     /**
  79       This is  needed, because #output# may still be
  80       NULL.
  81       */
  82     Offset offset_;
  83     Array<Staff_elem*> dependencies;
  84 };
  85
  86
  87 #endif // STAFFELEM_HH
  88