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, 1998, 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7   Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include "score-engraver.hh"
  11 #include "bar-engraver.hh"
  12 #include "staff-bar.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
  20 Bar_engraver::Bar_engraver()
  21 {
  22   bar_p_ =0;
  23   do_post_move_processing();
  24 }
  25
  26
  27
  28
  29 void
  30 Bar_engraver::create_bar ()
  31 {
  32   if (!bar_p_)
  33     {
  34       bar_p_ = new Staff_bar;
  35       bar_p_->set_elt_property ("break-aligned", SCM_BOOL_T);
  36
  37       // urg: "" != empty...
  38       SCM default_type = get_property ("defaultBarType", 0);
  39       if (gh_string_p (default_type))
  40         {
  41           bar_p_->set_elt_property ("glyph", default_type); // gu.h
  42         }
  43
  44 #if 0
  45       /*
  46         urg.  Why did I implement this? And did I implement this so
  47         clumsily?  */
  48       SCM prop = get_property ("barAtLineStart", 0);
  49       if (to_boolean (prop))
  50         {
  51           bar_p_->set_elt_property ("at-line-start", SCM_BOOL_T);
  52         }
  53 #endif
  54       announce_element (Score_element_info (bar_p_, 0));
  55     }
  56 }
  57
  58 /**
  59    Make a barline.  If there are both |: and :| requested, merge them
  60    to :|:.
  61
  62 */
  63 void
  64 Bar_engraver::request_bar (String requested_type)
  65 {
  66   if (!now_mom ())
  67     {
  68       SCM prop = get_property ("barAtLineStart", 0);
  69       if (!to_boolean (prop))
  70         return;
  71     }
  72   bool  bar_existed = bar_p_;
  73   create_bar ();
  74   if (bar_existed && requested_type == "")
  75     {
  76       return;
  77     }
  78
  79   String current = ly_scm2string (bar_p_->get_elt_property ("glyph"));
  80
  81   if ((requested_type == "|:" && current== ":|")
  82     || (requested_type == ":|" && current == "|:"))
  83     requested_type = ":|:";
  84
  85
  86   bar_p_->set_elt_property ("glyph",
  87                             ly_str02scm (requested_type.ch_C ()));
  88 }
  89
  90 void
  91 Bar_engraver::do_creation_processing ()
  92 {
  93 }
  94
  95 void
  96 Bar_engraver::do_removal_processing ()
  97 {
  98   if (bar_p_)
  99     {
 100       typeset_element (bar_p_);
 101       bar_p_ =0;
 102     }
 103 }
 104
 105 void
 106 Bar_engraver::do_process_requests()
 107 {
 108   Translator * t = daddy_grav_l  ()->get_simple_translator ("Timing_engraver");
 109
 110   Timing_engraver * te = dynamic_cast<Timing_engraver*>(t);
 111   String which = (te) ? te->which_bar () : "";
 112
 113   if (which.length_i ())
 114     {
 115       create_bar();
 116       bar_p_->set_elt_property ("glyph",  ly_str02scm (which.ch_C ()));
 117     }
 118
 119   if (!bar_p_)
 120     {
 121       Score_engraver * e = 0;
 122       Translator * t  =  daddy_grav_l ();
 123       for (; !e && t;  t = t->daddy_trans_l_)
 124         {
 125           e = dynamic_cast<Score_engraver*> (t);
 126         }
 127
 128       if (!e)
 129         programming_error ("No score engraver!");
 130       else
 131         e->forbid_breaks ();
 132     }
 133 }
 134
 135
 136 void
 137 Bar_engraver::do_pre_move_processing()
 138 {
 139   if (bar_p_)
 140     {
 141       typeset_element (bar_p_);
 142       bar_p_ =0;
 143     }
 144 }
 145
 146 ADD_THIS_TRANSLATOR(Bar_engraver);
 147
 148
 149