lily/text-engraver.cc

   1 /*
   2   text-engraver.cc --  implement Text_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11 #include "engraver.hh"
  12 #include "side-position-interface.hh"
  13 #include "item.hh"
  14 #include "musical-request.hh"
  15 #include "stem.hh"
  16 #include "rhythmic-head.hh"
  17
  18
  19 /**
  20    typeset directions that are  plain text.
  21  */
  22 class Text_engraver : public Engraver
  23 {
  24   Link_array<Text_script_req> reqs_;
  25   Link_array<Item> texts_;
  26 public:
  27   VIRTUAL_COPY_CONS (Translator);
  28 protected:
  29   virtual bool try_music (Music* m);
  30   virtual void stop_translation_timestep ();
  31   virtual void start_translation_timestep ();
  32   virtual void create_grobs ();
  33   virtual void acknowledge_grob (Grob_info);
  34 };
  35
  36 bool
  37 Text_engraver::try_music (Music *m)
  38 {
  39   if (dynamic_cast<Text_script_req*> (m)
  40       && m->get_mus_property ("text-type") != ly_symbol2scm ("dynamic"))
  41     {
  42       reqs_.push (dynamic_cast<Text_script_req*> (m));
  43       return true;
  44     }
  45   return false;
  46 }
  47
  48 void
  49 Text_engraver::acknowledge_grob (Grob_info inf)
  50 {
  51   if (Rhythmic_head::has_interface (inf.elem_l_))
  52     {
  53       for (int i=0; i < texts_.size (); i++)
  54         {
  55           Grob*t = texts_[i];
  56           Side_position_interface::add_support (t,inf.elem_l_);
  57
  58           /*
  59             ugh.
  60            */
  61           if (Side_position_interface::get_axis (t) == X_AXIS
  62               && !t->parent_l (Y_AXIS))
  63             t->set_parent (inf.elem_l_, Y_AXIS);
  64           else if (Side_position_interface::get_axis (t) == Y_AXIS
  65               && !t->parent_l (X_AXIS))
  66             t->set_parent (inf.elem_l_, X_AXIS);
  67         }
  68     }
  69
  70   if (Stem::has_interface (inf.elem_l_))
  71     {
  72       for (int i=0; i < texts_.size (); i++)
  73         {
  74           Side_position_interface::add_support (texts_[i],inf.elem_l_);
  75         }
  76     }
  77 }
  78
  79 void
  80 Text_engraver::create_grobs ()
  81 {
  82   if (texts_.size ())
  83     return;
  84   for (int i=0; i < reqs_.size (); i++)
  85     {
  86       Text_script_req * r = reqs_[i];
  87
  88       // URG: Text vs TextScript
  89       String basic = "TextScript";
  90
  91       if (r->get_mus_property ("text-type") == ly_symbol2scm ("finger"))
  92         {
  93           basic = "Fingering";
  94         }
  95
  96       Item *text = new Item (get_property (basic.ch_C ()));
  97
  98       /*
  99         FIXME -> need to use basic props.
 100        */
 101       SCM axisprop = get_property ("scriptHorizontal");
 102
 103       Axis ax = to_boolean (axisprop) ? X_AXIS : Y_AXIS;
 104       Side_position_interface::set_axis (text, ax);
 105
 106 #if 0
 107       if (r->style_str_ == "finger" && ax == Y_AXIS)
 108         {
 109           /*
 110             nicely center the scripts.
 111            */
 112           text->add_offset_callback (Side_position_interface::aligned_on_self_proc, X_AXIS);
 113           text->add_offset_callback (Side_position_interface::centered_on_parent_proc, X_AXIS);
 114         }
 115 #endif
 116
 117
 118
 119       /*
 120         make sure they're in order by adding i to the priority field.
 121         */
 122       text->set_grob_property ("script-priority",
 123                               gh_int2scm (200 + i));
 124
 125       if (r->get_direction ())
 126         Side_position_interface::set_direction (text, r->get_direction ());
 127
 128       text->set_grob_property ("text", r->get_mus_property ("text"));
 129
 130       SCM nonempty = get_property ("textNonEmpty");
 131       if (to_boolean (nonempty))
 132         /*
 133           empty text: signal that no rods should be applied.
 134          */
 135         text->set_grob_property ("no-spacing-rods" , SCM_BOOL_F);
 136
 137       announce_grob (text, r);
 138       texts_.push (text);
 139     }
 140 }
 141
 142 void
 143 Text_engraver::stop_translation_timestep ()
 144 {
 145   for (int i=0; i < texts_.size (); i++)
 146     {
 147       Item *ti = texts_[i];
 148       Side_position_interface::add_staff_support (ti);
 149       typeset_grob (ti);
 150     }
 151   texts_.clear ();
 152 }
 153
 154 void
 155 Text_engraver::start_translation_timestep ()
 156 {
 157   reqs_.clear ();
 158 }
 159
 160 ADD_THIS_TRANSLATOR (Text_engraver);
 161