lily/vertical-align-grav.cc

   1 /*
   2   vertical-align-grav.cc -- implement Vertical_align_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1998 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include "p-col.hh"
  10 #include "vertical-align-grav.hh"
  11 #include "vertical-align-spanner.hh"
  12 #include "vertical-group-elem.hh"
  13
  14 Vertical_align_engraver::Vertical_align_engraver()
  15 {
  16   valign_p_ =0;
  17 }
  18
  19 void
  20 Vertical_align_engraver::do_creation_processing()
  21 {
  22   valign_p_ =new Vertical_align_spanner;
  23   valign_p_->set_bounds(LEFT,get_staff_info().command_pcol_l ());
  24   announce_element (Score_elem_info (valign_p_ , 0));
  25 }
  26
  27 void
  28 Vertical_align_engraver::do_removal_processing()
  29 {
  30   valign_p_->set_bounds(RIGHT,get_staff_info().command_pcol_l ());
  31   typeset_element (valign_p_);
  32   valign_p_ =0;
  33 }
  34
  35 void
  36 Vertical_align_engraver::acknowledge_element (Score_elem_info i)
  37 {
  38   if (i.origin_grav_l_arr_.size() == 2 &&
  39        i.elem_l_->is_type_b (Vertical_group_element::static_name()) &&
  40        !i.elem_l_->axis_group_l_a_[Y_AXIS])
  41     {
  42       assert (!valign_p_->contains_b (i.elem_l_));
  43
  44       valign_p_->add (i.elem_l_);
  45     }
  46 }
  47
  48
  49 IMPLEMENT_IS_TYPE_B1(Vertical_align_engraver, Engraver);
  50 ADD_THIS_TRANSLATOR(Vertical_align_engraver);