lily/text-spanner-engraver.cc

   1 /*
   2   text-spanner-engraver.cc -- implement Text_spanner_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "dimensions.hh"
  10 #include "musical-request.hh"
  11 #include "paper-column.hh"
  12 #include "note-column.hh"
  13 #include "item.hh"
  14 #include "side-position-interface.hh"
  15 #include "engraver.hh"
  16 #include "group-interface.hh"
  17 #include "directional-element-interface.hh"
  18 #include "translator-group.hh"
  19 #include "axis-group-interface.hh"
  20
  21
  22 class Text_spanner_engraver : public Engraver
  23 {
  24 public:
  25   VIRTUAL_COPY_CONS (Translator);
  26   Text_spanner_engraver ();
  27
  28 protected:
  29   virtual void finalize ();
  30   virtual void acknowledge_grob (Grob_info);
  31   virtual bool try_music (Music *);
  32   virtual void stop_translation_timestep ();
  33   virtual void start_translation_timestep ();
  34   virtual void create_grobs ();
  35
  36 private:
  37   Spanner *span_;
  38   Spanner *finished_;
  39   Span_req *current_req_;
  40   Drul_array<Span_req*> req_drul_;
  41   void typeset_all ();
  42 };
  43
  44 ADD_THIS_TRANSLATOR (Text_spanner_engraver);
  45
  46
  47 Text_spanner_engraver::Text_spanner_engraver ()
  48 {
  49   finished_ = 0;
  50   current_req_ = 0;
  51   span_ =0;
  52   req_drul_[START] = 0;
  53   req_drul_[STOP] = 0;
  54 }
  55
  56 void
  57 Text_spanner_engraver::start_translation_timestep ()
  58 {
  59   req_drul_[START] = 0;
  60   req_drul_[STOP] = 0;
  61 }
  62
  63 bool
  64 Text_spanner_engraver::try_music (Music *m)
  65 {
  66   if (Span_req *s =  dynamic_cast <Span_req*> (m))
  67     {
  68       String t =  ly_scm2string (s->get_mus_property ("span-type"));
  69       if (t == "abort")
  70         {
  71           req_drul_[LEFT] = 0;
  72           req_drul_[RIGHT] = 0;
  73           if (span_)
  74             span_->suicide ();
  75           span_ = 0;
  76         }
  77       else if (t == "text")
  78         {
  79           req_drul_[s->get_span_dir()] = s;
  80           return true;
  81         }
  82     }
  83   return false;
  84 }
  85
  86 void
  87 Text_spanner_engraver::create_grobs ()
  88 {
  89   /////
  90   if (req_drul_[STOP])
  91     {
  92       if (!span_)
  93         {
  94           req_drul_[STOP]->origin ()->warning
  95             (_ ("can't find start of text spanner"));
  96         }
  97       else
  98         {
  99           assert (!finished_);
 100           Grob* e = unsmob_grob (get_property ("currentMusicalColumn"));
 101           span_->set_bound (RIGHT, e);
 102
 103           finished_ = span_;
 104           span_ = 0;
 105           current_req_ = 0;
 106         }
 107     }
 108
 109   if (req_drul_[START])
 110     {
 111       if (current_req_)
 112         {
 113           req_drul_[START]->origin ()->warning
 114             (_ ("already have a text spanner"));
 115         }
 116       else
 117         {
 118           current_req_ = req_drul_[START];
 119           span_  = new Spanner (get_property ("TextSpanner"));
 120
 121           /* Ugh.  Reset (de)cresc. specific properties */
 122           span_->set_grob_property ("outer", SCM_BOOL_T);
 123           span_->set_grob_property ("if-text-padding", gh_double2scm (0));
 124           span_->set_grob_property ("width-correct", gh_double2scm (0));
 125
 126           Side_position::set_axis (span_, Y_AXIS);
 127           Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 128           span_->set_bound (LEFT, e);
 129           announce_grob (span_, req_drul_[START]);
 130         }
 131     }
 132 }
 133
 134 void
 135 Text_spanner_engraver::acknowledge_grob (Grob_info info)
 136 {
 137   if (span_ && Note_column::has_interface (info.elem_l_))
 138     {
 139       Side_position::add_support (span_, info.elem_l_);
 140       add_bound_item (span_, dynamic_cast<Item*> (info.elem_l_));
 141     }
 142 }
 143
 144 void
 145 Text_spanner_engraver::typeset_all ()
 146 {
 147   if (finished_)
 148     {
 149       Side_position::add_staff_support (finished_);
 150       typeset_grob (finished_);
 151       finished_ = 0;
 152     }
 153 }
 154
 155 void
 156 Text_spanner_engraver::stop_translation_timestep ()
 157 {
 158   typeset_all ();
 159 }
 160
 161 void
 162 Text_spanner_engraver::finalize ()
 163 {
 164   typeset_all ();
 165   if (span_)
 166     {
 167       current_req_->origin ()->warning (_ ("unterminated text spanner"));
 168       span_->suicide ();
 169       span_ = 0;
 170     }
 171 }
 172