hdr/staffelem.hh

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