lily/instrument-name-engraver.cc

   1 /*
   2   instrument-name-engraver.cc --  implement Instrument_name_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "item.hh"
  12 #include "bar-line.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 #include "text-item.hh"
  19
  20 class Instrument_name_engraver : public Engraver
  21 {
  22   Item *text_;
  23   Grob *delim_ ;
  24
  25   void create_text ();
  26 public:
  27   TRANSLATOR_DECLARATIONS(Instrument_name_engraver);
  28
  29   virtual void initialize ();
  30   virtual void acknowledge_grob (Grob_info);
  31   virtual void stop_translation_timestep ();
  32   virtual void process_music ();
  33 };
  34
  35
  36
  37 Instrument_name_engraver::Instrument_name_engraver ()
  38 {
  39   text_ = 0;
  40   delim_ =0;
  41 }
  42
  43
  44 void
  45 Instrument_name_engraver::initialize ()
  46 {
  47   daddy_trans_->set_property ("instrumentSupport", SCM_EOL);
  48 }
  49
  50 void
  51 Instrument_name_engraver::stop_translation_timestep ()
  52 {
  53   if (text_)
  54     {
  55       text_->set_grob_property ("side-support-elements",
  56                                 get_property ("instrumentSupport"));
  57       typeset_grob (text_);
  58       text_ = 0;
  59     }
  60 }
  61
  62 void
  63 Instrument_name_engraver::create_text ()
  64 {
  65    if (!text_)
  66     {
  67       SCM txt = get_property ("instrument");
  68
  69       if (now_mom () > Moment (0))
  70         txt = get_property ("instr");
  71       /*
  72         UGH.
  73       */
  74       if (txt == SCM_EOL)
  75         return ;
  76
  77       text_ = new Item (get_property ("InstrumentName"));
  78
  79       if (text_->get_grob_property ("text") != txt)
  80         text_->set_grob_property ("text", txt);
  81
  82       if (delim_)
  83         text_->set_parent (delim_, Y_AXIS);
  84
  85       announce_grob (text_, SCM_EOL);
  86     }
  87 }
  88
  89 void
  90 Instrument_name_engraver::acknowledge_grob (Grob_info i)
  91 {
  92   if (Bar_line::has_interface (i.grob_))
  93     {
  94       create_text();
  95     }
  96
  97   if (dynamic_cast<Spanner*> (i.grob_)
  98       && i.grob_->internal_has_interface (ly_symbol2scm ("dynamic-interface")))
  99     return;
 100
 101   /*
 102     Hang the instrument names on the staves, but not on the alignment
 103     groups enclosing that staff. The alignment has no real location,
 104     but is only a vehicle for the placement routine it contains, and
 105     therefore the location of its refpoint won't be very useful.
 106
 107     We could also just use stavesFound, but lets keep this working
 108     without staffs as well.
 109   */
 110   if (dynamic_cast<Spanner*> (i.grob_)
 111       && ((Axis_group_interface::has_interface (i.grob_)
 112            && Axis_group_interface::axis_b (i.grob_, Y_AXIS)))
 113       && !Align_interface::has_interface (i.grob_))
 114     {
 115       SCM nl = gh_cons (i.grob_->self_scm (),
 116                         get_property ("instrumentSupport"));
 117
 118       daddy_trans_->set_property ("instrumentSupport", nl);
 119     }
 120 }
 121
 122 void
 123 Instrument_name_engraver::process_music ()
 124 {
 125   /*
 126     Also create text if barlines in other groups. This allows
 127     a name to be attached to lyrics or chords.
 128    */
 129   if (gh_string_p (get_property ("whichBar")))
 130     create_text();
 131 }
 132
 133 ENTER_DESCRIPTION(Instrument_name_engraver,
 134 /* descr */       " Prints the name of the instrument (specified by "
 135 " @code{Staff.instrument} and @code{Staff.instr}) "
 136 "at the left of the staff. ",
 137 /* creats*/       "InstrumentName",
 138 /* accepts */     "",
 139 /* acks  */      "bar-line-interface axis-group-interface",
 140 /* reads */       "instrument instr",
 141 /* write */       "");