lily/parenthesis-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "engraver.hh"
  22
  23 #include "item.hh"
  24 #include "pointer-group-interface.hh"
  25 #include "simple-closure.hh"
  26 #include "stream-event.hh"
  27 #include "warn.hh"
  28
  29 #include "translator.icc"
  30
  31 class Parenthesis_engraver : public Engraver
  32 {
  33   TRANSLATOR_DECLARATIONS (Parenthesis_engraver);
  34
  35 protected:
  36   DECLARE_ACKNOWLEDGER (grob);
  37 };
  38
  39 Parenthesis_engraver::Parenthesis_engraver ()
  40 {
  41 }
  42
  43 void
  44 Parenthesis_engraver::acknowledge_grob (Grob_info info)
  45 {
  46   if (Stream_event *ev = info.event_cause ())
  47     {
  48       if (to_boolean (ev->get_property ("parenthesize")))
  49         {
  50           if (Item *victim = dynamic_cast<Item*> (info.grob ()))
  51             {
  52               Engraver *eng = dynamic_cast<Engraver*> (info.origin_translator ());
  53               Item *paren = eng->make_item ("ParenthesesItem", victim->self_scm ());
  54               Pointer_group_interface::add_grob (paren, ly_symbol2scm ("elements"), victim);
  55
  56               paren->set_parent (victim, Y_AXIS);
  57
  58               Real size = robust_scm2double (paren->get_property ("font-size"), 0.0)
  59                 + robust_scm2double (victim->get_property ("font-size"), 0.0);
  60               paren->set_property ("font-size", scm_from_double (size));
  61
  62               /*
  63                 TODO?
  64
  65                 enlarge victim to allow for parentheses space?
  66               */
  67             }
  68           else
  69             {
  70               programming_error ("Don't know how to parenthesize spanners.");
  71             }
  72         }
  73     }
  74 }
  75
  76 ADD_ACKNOWLEDGER (Parenthesis_engraver, grob);
  77 ADD_TRANSLATOR (Parenthesis_engraver,
  78                 /* doc */
  79                 "Parenthesize objects whose music cause has the"
  80                 " @code{parenthesize} property.",
  81
  82                 /* create */
  83                 "ParenthesesItem ",
  84
  85                 /* read */
  86                 "",
  87
  88                 /* write */
  89                 ""
  90                 );