lily/instrument-name-engraver.cc

   1 /*
   2   new-staff-margin-engraver.cc --  implement Instrument_name_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "item.hh"
  12 #include "bar.hh"
  13 #include "system-start-delimiter.hh"
  14 #include "side-position-interface.hh"
  15 #include "align-interface.hh"
  16 #include "axis-group-interface.hh"
  17 #include "translator-group.hh"
  18
  19 class Instrument_name_engraver : public Engraver
  20 {
  21   Item *text_;
  22   Grob *delim_ ;
  23
  24   void create_text (SCM s);
  25 public:
  26   VIRTUAL_COPY_CONS (Translator);
  27   Instrument_name_engraver ();
  28   virtual void initialize ();
  29   virtual void acknowledge_grob (Grob_info);
  30   virtual void stop_translation_timestep ();
  31 };
  32
  33 ADD_THIS_TRANSLATOR (Instrument_name_engraver);
  34
  35 Instrument_name_engraver::Instrument_name_engraver ()
  36 {
  37   text_ = 0;
  38   delim_ =0;
  39 }
  40
  41
  42 void
  43 Instrument_name_engraver::initialize ()
  44 {
  45   daddy_trans_l_->set_property ("instrumentSupport", SCM_EOL);
  46 }
  47
  48 void
  49 Instrument_name_engraver::stop_translation_timestep ()
  50 {
  51   if (text_)
  52     {
  53       text_->set_grob_property ("side-support-elements",
  54                                 get_property ("instrumentSupport"));
  55       typeset_grob (text_);
  56       text_ = 0;
  57     }
  58 }
  59
  60 void
  61 Instrument_name_engraver::create_text (SCM txt)
  62 {
  63   if (!text_)
  64     {
  65       text_ = new Item (get_property ("InstrumentName"));
  66
  67       if (text_->get_grob_property ("text") != txt)
  68         text_->set_grob_property ("text", txt);
  69
  70       if (delim_)
  71         text_->set_parent (delim_, Y_AXIS);
  72
  73       announce_grob (text_,0);
  74     }
  75 }
  76
  77 void
  78 Instrument_name_engraver::acknowledge_grob (Grob_info i)
  79 {
  80   if (Bar::has_interface (i.elem_l_))
  81     {
  82       SCM s = get_property ("instrument");
  83
  84       if (now_mom () > Moment (0))
  85         s = get_property ("instr");
  86
  87       /*
  88         FIXME: use markup_p () to check type.
  89       */
  90       if (gh_string_p (s) || gh_pair_p (s))
  91         create_text (s);
  92     }
  93
  94   if (dynamic_cast<Spanner*> (i.elem_l_)
  95       && i.elem_l_->has_interface (ly_symbol2scm ("dynamic-interface")))
  96     return;
  97
  98   /*
  99     Hang the instrument names on the staves, but not on the alignment
 100     groups enclosing that staff. The alignment has no real location,
 101     but is only a vehicle for the placement routine it contains, and
 102     therefore the location of its refpoint won't be very useful.
 103
 104   */
 105   if (dynamic_cast<Spanner*> (i.elem_l_)
 106       && ((Axis_group_interface::has_interface (i.elem_l_)
 107            && Axis_group_interface::axis_b (i.elem_l_, Y_AXIS)))
 108       && !Align_interface::has_interface (i.elem_l_))
 109     {
 110       SCM nl = gh_cons (i.elem_l_->self_scm (),
 111                         get_property ("instrumentSupport"));
 112
 113       daddy_trans_l_->set_property ("instrumentSupport", nl);
 114     }
 115 }
 116
 117
 118
 119