lily/bar-number-engraver.cc

   1 /*
   2   bar-number-grav.cc -- implement Bar_number_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include "lily-guile.hh"
  11 #include "paper-column.hh"
  12 #include "paper-def.hh"
  13 #include "side-position-interface.hh"
  14 #include "staff-symbol.hh"
  15 #include "item.hh"
  16 #include "moment.hh"
  17 #include "engraver.hh"
  18 #include "translator-group.hh"
  19
  20
  21 class Bar_number_engraver : public Engraver
  22 {
  23 protected:
  24   Item* text_p_;
  25
  26 protected:
  27   virtual void stop_translation_timestep ();
  28   virtual void acknowledge_grob (Grob_info);
  29   virtual void initialize ();
  30   virtual void create_grobs ();
  31   void create_items();
  32
  33 public:
  34   VIRTUAL_COPY_CONS(Translator);
  35   Bar_number_engraver();
  36 };
  37
  38 void
  39 Bar_number_engraver::create_grobs ()
  40 {
  41   // todo include (&&!time->cadenza_b_ )
  42   SCM bn = get_property("currentBarNumber");
  43   SCM smp = get_property ("measurePosition");
  44   Moment mp =  (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
  45
  46   if (gh_number_p (bn) &&
  47       !mp && now_mom () > Moment (0))
  48     {
  49       create_items ();
  50
  51       // guh.
  52       text_p_->set_grob_property ("text",
  53                                  ly_str02scm (to_str (gh_scm2int (bn)).ch_C()));
  54     }
  55 }
  56
  57 ADD_THIS_TRANSLATOR(Bar_number_engraver);
  58
  59 Bar_number_engraver::Bar_number_engraver ()
  60 {
  61   text_p_ =0;
  62 }
  63
  64 void
  65 Bar_number_engraver::initialize ()
  66 {
  67   /*
  68     ugh: need to share code with mark_engraver
  69    */
  70   daddy_trans_l_->set_property ("staffsFound", SCM_EOL);
  71 }
  72
  73
  74
  75 void
  76 Bar_number_engraver::acknowledge_grob (Grob_info inf)
  77 {
  78   Grob * s = inf.elem_l_;
  79   if (Staff_symbol::has_interface (s))
  80     {
  81       SCM sts = get_property ("staffsFound");
  82       SCM thisstaff = inf.elem_l_->self_scm ();
  83       if (scm_memq (thisstaff, sts) == SCM_BOOL_F)
  84         daddy_trans_l_->set_property ("staffsFound", gh_cons (thisstaff, sts));
  85     }
  86   else if (text_p_
  87            && dynamic_cast<Item*> (s)
  88            && s->get_grob_property ("break-align-symbol") == ly_symbol2scm ("Left_edge_item"))
  89     {
  90       /*
  91         By default this would land on the Paper_column -- so why
  92         doesn't it work when you leave this out?  */
  93       text_p_->set_parent (s, X_AXIS);
  94     }
  95 }
  96
  97 void
  98 Bar_number_engraver::stop_translation_timestep ()
  99 {
 100   if (text_p_)
 101     {
 102       text_p_->set_grob_property ("side-support-elements", get_property ("staffsFound"));
 103       typeset_grob (text_p_);
 104       text_p_ =0;
 105     }
 106 }
 107
 108
 109 void
 110 Bar_number_engraver::create_items ()
 111 {
 112   if (text_p_)
 113     return;
 114
 115   SCM b = get_property ("BarNumber");
 116   text_p_ = new Item (b);
 117   Side_position::set_axis(text_p_,Y_AXIS);
 118
 119   announce_grob (text_p_, 0);
 120 }
 121