lily/mark-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1998--2010 Jan Nieuwenhuizen <janneke@gnu.org>
   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 <cctype>
  21 using namespace std;
  22
  23 #include "engraver.hh"
  24
  25 #include "axis-group-interface.hh"
  26 #include "bar-line.hh"
  27 #include "context.hh"
  28 #include "grob-array.hh"
  29 #include "international.hh"
  30 #include "item.hh"
  31 #include "stream-event.hh"
  32 #include "text-interface.hh"
  33 #include "warn.hh"
  34
  35 #include "translator.icc"
  36
  37 /**
  38    put stuff over or next to  bars.  Examples: bar numbers, marginal notes,
  39    rehearsal marks.
  40 */
  41 class Mark_engraver : public Engraver
  42 {
  43
  44   void create_items (Stream_event *);
  45   Item *text_;
  46   Item *final_text_;
  47   Stream_event *mark_ev_;
  48
  49 public:
  50   TRANSLATOR_DECLARATIONS (Mark_engraver);
  51
  52 protected:
  53   void process_music ();
  54   void start_translation_timestep ();
  55   void stop_translation_timestep ();
  56   virtual void finalize ();
  57
  58   DECLARE_TRANSLATOR_LISTENER (mark);
  59   DECLARE_ACKNOWLEDGER (break_alignment);
  60 };
  61
  62 Mark_engraver::Mark_engraver ()
  63 {
  64   text_ = 0;
  65   final_text_ = 0;
  66   mark_ev_ = 0;
  67 }
  68
  69 void
  70 Mark_engraver::acknowledge_break_alignment (Grob_info inf)
  71 {
  72   Grob *s = inf.grob ();
  73   if (text_
  74       && dynamic_cast<Item *> (s))
  75     text_->set_parent (s, X_AXIS);
  76 }
  77
  78 void
  79 Mark_engraver::start_translation_timestep ()
  80 {
  81   final_text_ = 0;
  82 }
  83
  84 void
  85 Mark_engraver::stop_translation_timestep ()
  86 {
  87   if (text_)
  88   {
  89     text_->set_object ("side-support-elements",
  90                        grob_list_to_grob_array (get_property ("stavesFound")));
  91     final_text_ = text_;
  92     text_ = 0;
  93   }
  94   mark_ev_ = 0;
  95 }
  96
  97 void
  98 Mark_engraver::finalize ()
  99 {
 100   if (final_text_)
 101     final_text_->set_property ("break-visibility",
 102                                scm_c_make_vector (3, SCM_BOOL_T));
 103   final_text_ = 0;
 104 }
 105
 106 void
 107 Mark_engraver::create_items (Stream_event *ev)
 108 {
 109   if (text_)
 110     return;
 111
 112   text_ = make_item ("RehearsalMark", ev->self_scm ());
 113 }
 114
 115 IMPLEMENT_TRANSLATOR_LISTENER (Mark_engraver, mark);
 116 void
 117 Mark_engraver::listen_mark (Stream_event *ev)
 118 {
 119   ASSIGN_EVENT_ONCE (mark_ev_, ev);
 120 }
 121
 122 /*
 123   TODO: make the increment function in Scheme.
 124 */
 125 void
 126 Mark_engraver::process_music ()
 127 {
 128   if (mark_ev_)
 129     {
 130       create_items (mark_ev_);
 131
 132       /*
 133         automatic marks.
 134       */
 135
 136       SCM m = mark_ev_->get_property ("label");
 137       SCM proc = get_property ("markFormatter");
 138       if (!Text_interface::is_markup (m)
 139           && ly_is_procedure (proc))
 140         {
 141           if (!scm_is_number (m))
 142             m = get_property ("rehearsalMark");
 143
 144           if (scm_integer_p (m) == SCM_BOOL_T
 145               && scm_exact_p (m) == SCM_BOOL_T)
 146             {
 147               int mark_count = scm_to_int (m);
 148               mark_count++;
 149               context ()->set_property ("rehearsalMark",
 150                                         scm_from_int (mark_count));
 151             }
 152
 153           if (scm_is_number (m))
 154             m = scm_call_2 (proc, m, context ()->self_scm ());
 155           else
 156             /* FIXME: constant error message.  */
 157             warning (_ ("rehearsalMark must have integer value"));
 158         }
 159
 160       if (Text_interface::is_markup (m))
 161         text_->set_property ("text", m);
 162       else
 163         warning (_ ("mark label must be a markup object"));
 164     }
 165 }
 166
 167 ADD_ACKNOWLEDGER (Mark_engraver, break_alignment);
 168
 169 ADD_TRANSLATOR (Mark_engraver,
 170                 /* doc */
 171                 "Create @code{RehearsalMark} objects.  It puts them on top of"
 172                 " all staves (which is taken from the property"
 173                 " @code{stavesFound}).  If moving this engraver to a different"
 174                 " context, @ref{Staff_collecting_engraver} must move along,"
 175                 " otherwise all marks end up on the same Y@tie{}location.",
 176
 177                 /* create */
 178                 "RehearsalMark ",
 179
 180                 /* read */
 181                 "markFormatter "
 182                 "rehearsalMark "
 183                 "stavesFound ",
 184
 185                 /* write */
 186                 ""
 187                 );