lily/extender-engraver.cc

   1 /*
   2   extender-engraver.cc -- implement Extender_engraver
   3
   4   (c) 1998--1999 Jan Nieuwenhuizen <janneke@gnu.org>
   5 */
   6
   7 #include "proto.hh"
   8 #include "musical-request.hh"
   9 #include "extender-engraver.hh"
  10 #include "extender-spanner.hh"
  11 #include "text-def.hh"
  12 #include "score-column.hh"
  13 #include "g-text-item.hh"
  14
  15 ADD_THIS_TRANSLATOR (Extender_engraver);
  16
  17 Extender_engraver::Extender_engraver ()
  18 {
  19   extender_spanner_p_ = 0;
  20   span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
  21 }
  22
  23 void
  24 Extender_engraver::acknowledge_element (Score_element_info i)
  25 {
  26   G_text_item* t = dynamic_cast<G_text_item*> (i.elem_l_);
  27   if (!t)
  28     return;
  29   if (!extender_spanner_p_)
  30     return;
  31   if (!span_reqs_drul_[LEFT])
  32     return;
  33
  34   if (!extender_spanner_p_->item_l_drul_[LEFT])
  35     extender_spanner_p_->set_textitem (LEFT, t);
  36   else
  37     if (span_reqs_drul_[RIGHT] && !extender_spanner_p_->item_l_drul_[RIGHT])
  38       extender_spanner_p_->set_textitem (RIGHT, t);
  39 }
  40
  41 bool
  42 Extender_engraver::do_try_music (Music* req_l)
  43 {
  44   if (Extender_req* p = dynamic_cast <Extender_req *> (req_l))
  45     {
  46       if (bool (extender_spanner_p_) == bool (p->spantype_ == START))
  47         return false;
  48
  49       Direction d = (!extender_spanner_p_) ? LEFT : RIGHT;
  50       if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (p))
  51         return false;
  52
  53       span_reqs_drul_[d] = p;
  54       span_mom_drul_[d] = get_staff_info ().musical_l ()->when ();
  55       return true;
  56     }
  57   return false;
  58 }
  59
  60 void
  61 Extender_engraver::do_removal_processing ()
  62 {
  63   if (extender_spanner_p_)
  64     {
  65       span_reqs_drul_[LEFT]->warning (_ ("unterminated extender"));
  66       extender_spanner_p_->set_bounds(RIGHT, get_staff_info ().command_l ());
  67     }
  68 }
  69
  70 void
  71 Extender_engraver::do_process_requests ()
  72 {
  73   if (extender_spanner_p_ || !span_reqs_drul_[LEFT])
  74     return;
  75
  76   extender_spanner_p_ = new Extender_spanner;
  77
  78   announce_element (Score_element_info (extender_spanner_p_, span_reqs_drul_[LEFT]));
  79 }
  80
  81 void
  82 Extender_engraver::do_pre_move_processing ()
  83 {
  84   if (!extender_spanner_p_ || !span_reqs_drul_[RIGHT])
  85     return;
  86
  87   typeset_element (extender_spanner_p_);
  88
  89   extender_spanner_p_ = 0;
  90   span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
  91 }
  92