lily/bar-grav.cc

   1 /*
   2   bar-reg.cc -- implement Bar_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include "bar-grav.hh"
  10 #include "bar.hh"
  11 #include "command-request.hh"
  12 #include "time-description.hh"
  13 #include "engraver-group.hh"
  14
  15 Bar_engraver::Bar_engraver()
  16 {
  17   do_post_move_processing();
  18 }
  19
  20 bool
  21 Bar_engraver::do_try_request (Request*r_l)
  22 {
  23   Command_req* c_l = r_l->command();
  24   if (!c_l|| !c_l->bar())
  25     return false;
  26   Bar_req  * b= c_l->bar();
  27   if (bar_req_l_ && bar_req_l_->equal_b (b))
  28     return false;
  29
  30   bar_req_l_ = b;
  31
  32   return true;
  33 }
  34
  35 void
  36 Bar_engraver::do_process_requests()
  37 {
  38   if (bar_req_l_)
  39     {
  40       bar_p_ = new Bar;
  41       bar_p_->type_str_=bar_req_l_->type_str_;
  42     }
  43   else
  44     {
  45       Time_description const *time = get_staff_info().time_C_;
  46       if (time && !time->whole_in_measure_)
  47         bar_p_ = new Bar;
  48     }
  49
  50   if (bar_p_)
  51     {
  52       announce_element (Score_elem_info (bar_p_, bar_req_l_));
  53     }
  54   else
  55     {
  56       Disallow_break_req r;
  57       daddy_grav_l_->try_request (&r);
  58     }
  59 }
  60
  61
  62 void
  63 Bar_engraver::do_pre_move_processing()
  64 {
  65   if (bar_p_)
  66     {
  67       typeset_element (bar_p_);
  68       bar_p_ =0;
  69     }
  70 }
  71
  72 void
  73 Bar_engraver::do_post_move_processing()
  74 {
  75   bar_req_l_ = 0;
  76   bar_p_ =0;
  77 }
  78
  79
  80 IMPLEMENT_IS_TYPE_B1(Bar_engraver,Engraver);
  81 ADD_THIS_ENGRAVER(Bar_engraver);
  82
  83