lily/extender-engraver.cc

   1 /*
   2   extender-engraver.cc -- implement Extender_engraver
   3
   4   (c) 1998 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 "text-item.hh"
  14
  15 IMPLEMENT_IS_TYPE_B1 (Extender_engraver,Engraver);
  16 ADD_THIS_TRANSLATOR (Extender_engraver);
  17
  18 Extender_engraver::Extender_engraver ()
  19 {
  20   extender_spanner_p_ = 0;
  21   span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
  22 }
  23
  24 void
  25 Extender_engraver::acknowledge_element (Score_element_info i)
  26 {
  27   Text_item* t = (dynamic_cast<Text_item*> (i.elem_l_));
  28   if (!t)
  29     return;
  30   if (!extender_spanner_p_)
  31     return;
  32   if (!span_reqs_drul_[LEFT])
  33     return;
  34
  35   if (!extender_spanner_p_->textitem_l_drul_[LEFT])
  36     extender_spanner_p_->set_textitem (LEFT, t);
  37   else
  38     if (span_reqs_drul_[RIGHT] && !extender_spanner_p_->textitem_l_drul_[RIGHT])
  39       extender_spanner_p_->set_textitem (RIGHT, t);
  40 }
  41
  42 bool
  43 Extender_engraver::do_try_request (Request* req_l)
  44 {
  45   Extender_req* p = dynamic_cast <Extender_req *> (req_l);
  46   if (!p)
  47     return false;
  48
  49   if (bool (extender_spanner_p_) == bool (p->spantype == Span_req::START))
  50     return false;
  51
  52   Direction d = (!extender_spanner_p_) ? LEFT : RIGHT;
  53   if (span_reqs_drul_[d] && !span_reqs_drul_[d]->equal_b (req_l))
  54     return false;
  55
  56   span_reqs_drul_[d] = p;
  57   span_mom_drul_[d] = get_staff_info ().musical_l ()->when ();
  58   return true;
  59 }
  60
  61 void
  62 Extender_engraver::do_removal_processing ()
  63 {
  64   if (extender_spanner_p_)
  65     {
  66       span_reqs_drul_[LEFT]->warning (_ ("unterminated extender"));
  67       extender_spanner_p_->unlink ();
  68       delete extender_spanner_p_;
  69       extender_spanner_p_ = 0;
  70       span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
  71     }
  72 }
  73
  74 void
  75 Extender_engraver::do_process_requests ()
  76 {
  77   if (extender_spanner_p_ || !span_reqs_drul_[LEFT])
  78     return;
  79
  80   extender_spanner_p_ = new Extender_spanner;
  81
  82   announce_element (Score_element_info (extender_spanner_p_, span_reqs_drul_[LEFT]));
  83 }
  84
  85 void
  86 Extender_engraver::do_pre_move_processing ()
  87 {
  88   if (!extender_spanner_p_ || !span_reqs_drul_[RIGHT])
  89     return;
  90
  91   typeset_element (extender_spanner_p_);
  92
  93   extender_spanner_p_ = 0;
  94   span_reqs_drul_[RIGHT] = span_reqs_drul_[LEFT] = 0;
  95 }
  96