lily/paper-column.cc

   1 /*
   2   paper-column.cc -- implement Paper_column
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "moment.hh"
  10 #include "paper-column.hh"
  11 #include "paper-score.hh"
  12 #include "warn.hh"
  13 #include "axis-group-interface.hh"
  14 #include "spaceable-grob.hh"
  15 #include "molecule.hh"
  16 #include "text-item.hh"
  17 #include "lookup.hh"
  18 #include "font-interface.hh"
  19
  20
  21
  22
  23
  24 ADD_INTERFACE (Paper_column, "paper-column-interface",
  25   "  Paper_columns form the top-most item parent. (The Paper_columns X\n"
  26 "  parent is System, which is a spanner.)\n"
  27 "\n"
  28 "  Paper_columns form the units for the spacing engine. They are\n"
  29 "  numbered, the first (leftmost) is column 0. Numbering happens before\n"
  30 "  line-breaking, and columns are not renumbered after line breaking.\n"
  31 "\n"
  32 "  Since many columns go unused, you should only use the rank field to\n"
  33 "  get ordering information.  Two adjacent columns may have\n"
  34 "  non-adjacent numbers.\n"
  35 "\n"
  36 "  Don't be confused by right-items: each spacing wish can also contain\n"
  37 "  a number of items, with which a spacing constraint may be kept. It's\n"
  38 "  a little baroque, but it might come in handy later on?\n"
  39 "\n",
  40   "between-cols between-system-string when bounded-by-me shortest-playing-duration shortest-starter-duration");
  41
  42
  43 void
  44 Paper_column::do_break_processing ()
  45 {
  46   Spaceable_grob::remove_interface (this);
  47   Item::do_break_processing ();
  48 }
  49
  50
  51 int
  52 Paper_column::get_rank (Grob*me)
  53 {
  54   return dynamic_cast<Paper_column*> (me)->rank_;
  55 }
  56
  57 System*
  58 Paper_column::get_system () const
  59 {
  60   return system_;
  61 }
  62
  63 Paper_column*
  64 Paper_column::get_column () const
  65 {
  66   return (Paper_column*) (this);
  67 }
  68
  69 Paper_column::Paper_column (SCM l)
  70   : Item (l)            // guh.?
  71 {
  72   system_=0;
  73   rank_ = -1;
  74 }
  75
  76 Moment
  77 Paper_column::when_mom (Grob*me)
  78 {
  79   SCM m = me->get_grob_property ("when");
  80   Moment s (0);
  81   if (unsmob_moment (m))
  82     {
  83       return *unsmob_moment (m);
  84     }
  85   return s;
  86 }
  87
  88 bool
  89 Paper_column::musical_b (Grob *me)
  90 {
  91   SCM m = me->get_grob_property ("shortest-starter-duration");
  92   Moment s (0);
  93   if (unsmob_moment (m))
  94     {
  95       s = *unsmob_moment (m);
  96     }
  97   return s != Moment (0);
  98
  99 }
 100
 101
 102 bool
 103 Paper_column::used_b (Grob*me)
 104 {
 105   return gh_pair_p (me->get_grob_property ("elements")) ||  Item::breakable_b (me)
 106     || gh_pair_p (me->get_grob_property ("bounded-by-me"))
 107     ;
 108 }
 109
 110 /*
 111   Print a vertical line and  the rank number, to aid debugging.
 112  */
 113
 114 MAKE_SCHEME_CALLBACK(Paper_column,brew_molecule,1);
 115 SCM
 116 Paper_column::brew_molecule (SCM p)
 117 {
 118   Grob *me = unsmob_grob (p);
 119
 120   String r = to_string (Paper_column::get_rank (me));
 121   SCM properties = Font_interface::font_alist_chain (me);
 122
 123   SCM scm_mol = Text_item::interpret_markup (p, properties,
 124                                              scm_makfrom0str (r.to_str0 ()));
 125   Molecule t = *unsmob_molecule (scm_mol);
 126   t.align_to (X_AXIS, CENTER);
 127   t.align_to (Y_AXIS, DOWN);
 128
 129   Molecule l = Lookup::filledbox (Box (Interval (-0.01, 0.01),
 130                                        Interval (-2, -1)));
 131
 132   t.add_molecule (l);
 133   return t.smobbed_copy ();
 134 }
 135
 136 /*
 137   This is all too hairy. We use bounded-by-me to make sure that some
 138   columns are kept "alive". Unfortunately, when spanners are suicided,
 139   this falls apart again. (sigh.)
 140
 141   THIS IS BROKEN KLUDGE. WE SHOULD INVENT SOMETHING BETTER.
 142  */
 143 MAKE_SCHEME_CALLBACK(Paper_column,before_line_breaking,1);
 144 SCM
 145 Paper_column::before_line_breaking (SCM grob)
 146 {
 147   Grob *me = unsmob_grob (grob);
 148
 149   SCM c = me->get_grob_property ("bounded-by-me");
 150   SCM *ptrptr = &c;
 151
 152   while (gh_pair_p (*ptrptr))
 153     {
 154       Grob * g = unsmob_grob (gh_car (*ptrptr));
 155
 156       if (!g || !g->live ())
 157         {
 158           *ptrptr = gh_cdr (*ptrptr);
 159         }
 160       else
 161         {
 162           ptrptr = SCM_CDRLOC (*ptrptr);
 163         }
 164     }
 165
 166   me->set_grob_property ("bounded-by-me", c);
 167   return SCM_UNSPECIFIED;
 168 }