lily/bar-engraver.cc

   1 /*
   2   bar-engraver.cc -- implement Bar_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7   Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include "bar.hh"
  11 #include "score-engraver.hh"
  12 #include "bar-engraver.hh"
  13 #include "musical-request.hh"
  14 #include "multi-measure-rest.hh"
  15 #include "command-request.hh"
  16 #include "timing-engraver.hh"
  17 #include "engraver-group-engraver.hh"
  18 #include "warn.hh"
  19 #include "item.hh"
  20
  21 Bar_engraver::Bar_engraver()
  22 {
  23   bar_p_ =0;
  24   do_post_move_processing();
  25 }
  26
  27 void
  28 Bar_engraver::create_bar ()
  29 {
  30   if (!bar_p_)
  31     {
  32       bar_p_ = new Item (get_property ("basicBarProperties"));
  33
  34       SCM default_type = get_property ("defaultBarType");
  35       if (gh_string_p (default_type))
  36         {
  37           bar_p_->set_elt_property ("glyph", default_type); // ugh
  38         }
  39
  40       announce_element (Score_element_info (bar_p_, 0));
  41     }
  42 }
  43
  44 /**
  45    Make a barline.  If there are both |: and :| requested, merge them
  46    to :|:.
  47 */
  48 void
  49 Bar_engraver::request_bar (String requested_type)
  50 {
  51   if (!now_mom ())
  52     {
  53       SCM prop = get_property ("barAtLineStart");
  54       if (!to_boolean (prop))
  55         return;
  56     }
  57   bool  bar_existed = bar_p_;
  58   create_bar ();
  59   if (bar_existed && requested_type == "")
  60     {
  61       return;
  62     }
  63
  64   String current = ly_scm2string (bar_p_->get_elt_property ("glyph"));
  65
  66   if ((requested_type == "|:" && current== ":|")
  67     || (requested_type == ":|" && current == "|:"))
  68     requested_type = ":|:";
  69
  70
  71   bar_p_->set_elt_property ("glyph",
  72                             ly_str02scm (requested_type.ch_C ()));
  73 }
  74
  75 void
  76 Bar_engraver::do_creation_processing ()
  77 {
  78 }
  79
  80 void
  81 Bar_engraver::do_removal_processing ()
  82 {
  83   if (bar_p_)
  84     {
  85       typeset_element (bar_p_);
  86       bar_p_ =0;
  87     }
  88 }
  89
  90 void
  91 Bar_engraver::do_process_music()
  92 {
  93   Translator * t = daddy_grav_l  ()->get_simple_translator ("Timing_engraver");
  94
  95   Timing_engraver * te = dynamic_cast<Timing_engraver*>(t);
  96   String which = (te) ? te->which_bar () : "";
  97
  98   if (which.length_i ())
  99     {
 100       create_bar();
 101       bar_p_->set_elt_property ("glyph",  ly_str02scm (which.ch_C ()));
 102     }
 103
 104   if (!bar_p_)
 105     {
 106       Score_engraver * e = 0;
 107       Translator * t  =  daddy_grav_l ();
 108       for (; !e && t;  t = t->daddy_trans_l_)
 109         {
 110           e = dynamic_cast<Score_engraver*> (t);
 111         }
 112
 113       if (!e)
 114         programming_error ("No score engraver!");
 115       else
 116         e->forbid_breaks ();
 117     }
 118 }
 119
 120
 121 void
 122 Bar_engraver::do_pre_move_processing()
 123 {
 124   if (bar_p_)
 125     {
 126       typeset_element (bar_p_);
 127       bar_p_ =0;
 128     }
 129 }
 130
 131 ADD_THIS_TRANSLATOR(Bar_engraver);
 132
 133
 134