lily/bar-number-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "paper-column.hh"
  21 #include "output-def.hh"
  22 #include "side-position-interface.hh"
  23 #include "engraver.hh"
  24 #include "context.hh"
  25 #include "grob-array.hh"
  26
  27 #include "translator.icc"
  28
  29 /*
  30   TODO: detect the top staff (stavesFound), and acknowledge staff-group
  31   system-start-delims. If we find these, and the top staff is in the
  32   staff-group, add padding to the bar number.
  33 */
  34 class Bar_number_engraver : public Engraver
  35 {
  36 protected:
  37   Item *text_;
  38 protected:
  39   void stop_translation_timestep ();
  40   DECLARE_ACKNOWLEDGER (break_aligned);
  41   DECLARE_ACKNOWLEDGER (break_alignment);
  42   void process_music ();
  43   void create_items ();
  44   TRANSLATOR_DECLARATIONS (Bar_number_engraver);
  45 };
  46
  47 void
  48 Bar_number_engraver::process_music ()
  49 {
  50   SCM wb = get_property ("whichBar");
  51
  52   if (scm_is_string (wb))
  53     {
  54       Moment mp (robust_scm2moment (get_property ("measurePosition"), Moment (0)));
  55       if (mp.main_part_ == Rational (0))
  56         {
  57           SCM bn = get_property ("currentBarNumber");
  58           SCM proc = get_property ("barNumberVisibility");
  59           if (scm_is_number (bn) && ly_is_procedure (proc)
  60               && to_boolean (scm_call_1 (proc, bn)))
  61             {
  62               create_items ();
  63               // guh.
  64               text_->set_property
  65                 ("text", scm_number_to_string (bn, scm_from_int (10)));
  66             }
  67         }
  68     }
  69 }
  70
  71 Bar_number_engraver::Bar_number_engraver ()
  72 {
  73   text_ = 0;
  74 }
  75
  76
  77 /*
  78   see rehearsal mark comments.
  79  */
  80 void
  81 Bar_number_engraver::acknowledge_break_aligned (Grob_info inf)
  82 {
  83   Grob *s = inf.grob ();
  84   if (text_
  85       && !text_->get_parent (X_AXIS)
  86       && dynamic_cast<Item *> (s)
  87       && (s->get_property_data ("break-align-symbol")
  88           == text_->get_property_data ("break-align-symbol")))
  89     {
  90       /*
  91         By default this would land on the Paper_column -- so why
  92         doesn't it work when you leave this out?  */
  93       text_->set_parent (s, X_AXIS);
  94     }
  95 }
  96
  97
  98 void
  99 Bar_number_engraver::acknowledge_break_alignment (Grob_info inf)
 100 {
 101   Grob *s = inf.grob ();
 102   if (text_
 103       && dynamic_cast<Item *> (s))
 104     {
 105       text_->set_parent (s, X_AXIS);
 106     }
 107 }
 108
 109 void
 110 Bar_number_engraver::stop_translation_timestep ()
 111 {
 112   if (text_)
 113     {
 114       text_->set_object ("side-support-elements",
 115                          grob_list_to_grob_array (get_property ("stavesFound")));
 116       text_ = 0;
 117     }
 118 }
 119
 120 void
 121 Bar_number_engraver::create_items ()
 122 {
 123   if (text_)
 124     return;
 125
 126   text_ = make_item ("BarNumber", SCM_EOL);
 127 }
 128
 129
 130 ADD_ACKNOWLEDGER (Bar_number_engraver, break_aligned);
 131 ADD_ACKNOWLEDGER (Bar_number_engraver, break_alignment);
 132
 133 ADD_TRANSLATOR (Bar_number_engraver,
 134                 /* doc */
 135                 "A bar number is created whenever @code{measurePosition} is"
 136                 " zero and when there is a bar line (i.e., when"
 137                 " @code{whichBar} is set).  It is put on top of all staves,"
 138                 " and appears only at the left side of the staff.  The staves"
 139                 " are taken from @code{stavesFound}, which is maintained by"
 140                 " @ref{Staff_collecting_engraver}.",
 141
 142                 /* create */
 143                 "BarNumber ",
 144
 145                 /* read */
 146                 "currentBarNumber "
 147                 "whichBar "
 148                 "stavesFound "
 149                 "barNumberVisibility ",
 150
 151                 /* write */
 152                 ""
 153                 );