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 "bar-engraver.hh"
  11 #include "staff-bar.hh"
  12 #include "musical-request.hh"
  13 #include "multi-measure-rest.hh"
  14 #include "command-request.hh"
  15 #include "time-description.hh"
  16 #include "engraver-group.hh"
  17
  18 Bar_engraver::Bar_engraver()
  19 {
  20   bar_p_ =0;
  21   do_post_move_processing();
  22 }
  23
  24 bool
  25 Bar_engraver::do_try_music (Music*r_l)
  26 {
  27   if (Bar_req  * b= dynamic_cast <Bar_req *> (r_l))
  28     {
  29       if (bar_req_l_ && bar_req_l_->equal_b (b)) // huh?
  30         return false;
  31
  32       bar_req_l_ = b;
  33       return true;
  34     }
  35
  36   return false;
  37
  38 }
  39
  40
  41
  42 void
  43 Bar_engraver::create_bar ()
  44 {
  45   if (!bar_p_)
  46     {
  47       bar_p_ = new Staff_bar;
  48       bar_p_->set_elt_property (break_priority_scm_sym, gh_int2scm (0));
  49
  50       // urg: "" != empty...
  51       String default_type = get_property ("defaultBarType", 0);
  52       if (default_type.length_i ())
  53         {
  54           bar_p_->type_str_ = default_type;
  55         }
  56
  57       /*
  58         urg.  Why did I implement this?
  59        */
  60       Scalar prop = get_property ("barAtLineStart", 0);
  61       if (prop.to_bool ())
  62         {
  63           bar_p_->set_elt_property (at_line_start_scm_sym, SCM_BOOL_T);
  64         }
  65       announce_element (Score_element_info (bar_p_, bar_req_l_));
  66     }
  67 }
  68
  69 void
  70 Bar_engraver::request_bar (String type_str)
  71 {
  72   Scalar prop = get_property ("barAtLineStart", 0);
  73   if (!now_mom ())
  74     {
  75       Scalar prop = get_property ("barAtLineStart", 0);
  76       if (!prop.to_bool ())
  77         return;
  78     }
  79   create_bar ();
  80   if (((type_str == "|:") && (bar_p_->type_str_ == ":|"))
  81     || ((type_str == ":|") && (bar_p_->type_str_ == "|:")))
  82     bar_p_->type_str_ = ":|:";
  83   else
  84     bar_p_->type_str_ = type_str;
  85 }
  86
  87 void
  88 Bar_engraver::do_creation_processing ()
  89 {
  90   create_bar ();
  91   bar_p_->type_str_ = "";
  92 }
  93
  94 void
  95 Bar_engraver::do_removal_processing ()
  96 {
  97   if (bar_p_)
  98     {
  99       typeset_element (bar_p_);
 100       bar_p_ =0;
 101     }
 102 }
 103
 104 void
 105 Bar_engraver::do_process_requests()
 106 {
 107   Time_description const *time = get_staff_info().time_C_;
 108   if (bar_req_l_)
 109     {
 110       create_bar ();
 111       bar_p_->type_str_ = bar_req_l_->type_str_;
 112     }
 113   else if (!now_mom ())
 114     {
 115       create_bar ();
 116       bar_p_->type_str_ = "|";
 117     }
 118   else
 119     {
 120       Scalar nonauto = get_property ("barNonAuto", 0);
 121       if (!nonauto.to_bool ())
 122         {
 123           Scalar always = get_property ("barAlways", 0);
 124           if ((time && !time->whole_in_measure_) || always.to_bool ())
 125             create_bar ();
 126         }
 127     }
 128
 129   if (!bar_p_)
 130     {
 131       Break_req r;
 132       r.penalty_i_ = Break_req::DISALLOW;
 133       daddy_grav_l ()->try_music (&r);
 134     }
 135 }
 136
 137
 138 void
 139 Bar_engraver::do_pre_move_processing()
 140 {
 141   if (bar_p_)
 142     {
 143       typeset_element (bar_p_);
 144       bar_p_ =0;
 145     }
 146 }
 147
 148 void
 149 Bar_engraver::do_post_move_processing()
 150 {
 151   bar_req_l_ = 0;
 152 }
 153
 154
 155
 156 ADD_THIS_TRANSLATOR(Bar_engraver);
 157
 158