lily/hyphen-engraver.cc

   1 /*
   2   hyphen-engraver.cc -- implement Hyphen_engraver
   3
   4   (c) 1999 Glen Prideaux <glenprideaux@iname.com>
   5 */
   6
   7 #include "proto.hh"
   8 #include "musical-request.hh"
   9 #include "hyphen-spanner.hh"
  10 #include "paper-column.hh"
  11 #include "item.hh"
  12 #include "engraver.hh"
  13
  14 /**
  15   Generate an centred hyphen.  Should make a Hyphen_spanner that
  16   typesets a nice centred hyphen of varying length depending on the
  17   gap between syllables.
  18
  19   We remember the last Item that come across. When we get a
  20   request, we create the spanner, and attach the left point to the
  21   last lyrics, and the right point to any lyrics we receive by
  22   then.  */
  23 class Hyphen_engraver : public Engraver
  24 {
  25   Score_element *last_lyric_l_;
  26   Score_element *current_lyric_l_;
  27   Hyphen_req* req_l_;
  28   Spanner* hyphen_p_;
  29 public:
  30   Hyphen_engraver ();
  31   VIRTUAL_COPY_CONS (Translator);
  32
  33 protected:
  34   virtual void acknowledge_element (Score_element_info);
  35   virtual void do_removal_processing();
  36   virtual void do_process_music();
  37   virtual bool do_try_music (Music*);
  38   virtual void do_pre_move_processing();
  39   virtual void do_post_move_processing ();
  40 private:
  41
  42 };
  43
  44 ADD_THIS_TRANSLATOR (Hyphen_engraver);
  45
  46 Hyphen_engraver::Hyphen_engraver ()
  47 {
  48   current_lyric_l_ = 0;
  49   last_lyric_l_ = 0;
  50   hyphen_p_ = 0;
  51   req_l_ = 0;
  52 }
  53
  54 void
  55 Hyphen_engraver::acknowledge_element (Score_element_info i)
  56 {
  57   // -> text-item
  58   if (i.elem_l_->has_interface (ly_symbol2scm ("text-item-interface")))
  59     {
  60       current_lyric_l_ = i.elem_l_;
  61       if (hyphen_p_
  62           && !hyphen_p_->get_bound (RIGHT)
  63             )
  64           {
  65             Hyphen_spanner (hyphen_p_).set_textitem (RIGHT, i.elem_l_);
  66           }
  67     }
  68 }
  69
  70
  71 bool
  72 Hyphen_engraver::do_try_music (Music* r)
  73 {
  74   if (Hyphen_req* p = dynamic_cast <Hyphen_req *> (r))
  75     {
  76       if (req_l_)
  77         return false;
  78
  79       req_l_ = p;
  80       return true;
  81     }
  82   return false;
  83 }
  84
  85 void
  86 Hyphen_engraver::do_removal_processing ()
  87 {
  88   if (hyphen_p_)
  89     {
  90       req_l_->warning (_ ("unterminated hyphen"));
  91       hyphen_p_->set_bound(RIGHT, unsmob_element (get_property ("currentCommandColumn")));
  92     }
  93 }
  94
  95 void
  96 Hyphen_engraver::do_process_music ()
  97 {
  98   if (req_l_)
  99     {
 100       if (!last_lyric_l_)
 101         {
 102           req_l_->warning (_ ("Nothing to connect hyphen to on the left.  Ignoring hyphen request."));
 103           return;
 104         }
 105
 106       hyphen_p_ = new Spanner (get_property ("basicHyphenSpannerProperties"));
 107       hyphen_p_->set_extent_callback (Score_element::point_dimension_callback,Y_AXIS);
 108       Hyphen_spanner (hyphen_p_).set_textitem  (LEFT, last_lyric_l_);
 109       announce_element (Score_element_info (hyphen_p_, req_l_));
 110     }
 111 }
 112
 113
 114 void
 115 Hyphen_engraver::do_pre_move_processing ()
 116 {
 117   if (hyphen_p_)
 118     {
 119       typeset_element (hyphen_p_);
 120       hyphen_p_ = 0;
 121     }
 122
 123   if (current_lyric_l_)
 124     {
 125       last_lyric_l_ = current_lyric_l_;
 126       current_lyric_l_ =0;
 127     }
 128 }
 129
 130 void
 131 Hyphen_engraver::do_post_move_processing ()
 132 {
 133   req_l_ = 0;
 134 }
 135
 136