Merge branch 'master' of ssh://git.savannah.gnu.org/srv/git/lilypond

[lilypond.git] / lily / bar-number-engraver.cc

diff --git a/lily/bar-number-engraver.cc b/lily/bar-number-engraver.cc
index 99eb26a26cb7c3d7504ecbafba3d860d8f4a21e9..82bc09f0ed02160e009868013bb31fcb9299f517 100644 (file)
--- a/lily/bar-number-engraver.cc
+++ b/lily/bar-number-engraver.cc
@@ -1,40 +1,129 @@
 /*
-  bar-number-grav.cc -- implement Bar_number_engraver
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "paper-column.hh"
+#include "output-def.hh"
+#include "side-position-interface.hh"
+#include "engraver.hh"
+#include "context.hh"
+#include "grob-array.hh"
+
+#include "translator.icc"
+
+/*
+  TODO: detect the top staff (stavesFound), and acknowledge staff-group
+  system-start-delims. If we find these, and the top staff is in the
+  staff-group, add padding to the bar number.
 */
+class Bar_number_engraver : public Engraver
+{
+protected:
+  Item *text_;
+protected:
+  void stop_translation_timestep ();
+  DECLARE_ACKNOWLEDGER (break_alignment);
+  void process_music ();
+  void create_items ();
+  TRANSLATOR_DECLARATIONS (Bar_number_engraver);
+};
 
+void
+Bar_number_engraver::process_music ()
+{
+  SCM wb = get_property ("whichBar");
 
-#include "bar-number-engraver.hh"
-#include "time-description.hh"
-#include "timing-engraver.hh"
-#include "engraver-group-engraver.hh"
-#include "text-item.hh"
+  if (scm_is_string (wb))
+    {
+      Moment mp (robust_scm2moment (get_property ("measurePosition"), Moment (0)));
+      if (mp.main_part_ == Rational (0))
+       {
+         SCM bn = get_property ("currentBarNumber");
+         SCM proc = get_property ("barNumberVisibility");
+         if (scm_is_number (bn) && ly_is_procedure (proc)
+             && to_boolean (scm_call_1 (proc, bn)))
+           {
+             create_items ();
+             // guh.
+             text_->set_property
+               ("text", scm_number_to_string (bn, scm_from_int (10)));
+           }
+       }
+    }
+}
 
-Bar_number_engraver::Bar_number_engraver()
+Bar_number_engraver::Bar_number_engraver ()
 {
-  axis_ = Y_AXIS;
-  type_ = "barNumber";
-  visibility_lambda_
-    = gh_eval_str ("postbreak_only_visibility");
+  text_ = 0;
 }
 
 void
-Bar_number_engraver::do_process_requests ()
+Bar_number_engraver::acknowledge_break_alignment (Grob_info inf)
 {
-  Translator *tr = daddy_grav_l ()->get_simple_translator ("Timing_engraver");
-  Timing_translator *timer = dynamic_cast<Timing_translator*>(tr);
-  Time_description *time = &timer->time_;
+  Grob *s = inf.grob ();
+  if (text_
+      && dynamic_cast<Item *> (s))
+    {
+      text_->set_parent (s, X_AXIS);
+    }
+}
 
-  if (!time->whole_in_measure_ && !time->cadenza_b_ && now_mom () > Moment (0))
+void
+Bar_number_engraver::stop_translation_timestep ()
+{
+  if (text_)
     {
-      create_items (0);
-       
-      text_p_->text_str_ = to_str (time->bars_i_);
-      text_p_->style_str_ = "roman";
+      text_->set_object ("side-support-elements",
+                        grob_list_to_grob_array (get_property ("stavesFound")));
+      text_ = 0;
     }
 }
 
-ADD_THIS_TRANSLATOR(Bar_number_engraver);
+void
+Bar_number_engraver::create_items ()
+{
+  if (text_)
+    return;
+
+  text_ = make_item ("BarNumber", SCM_EOL);
+}
+
+
+ADD_ACKNOWLEDGER (Bar_number_engraver, break_alignment);
+
+ADD_TRANSLATOR (Bar_number_engraver,
+               /* doc */
+               "A bar number is created whenever @code{measurePosition} is"
+               " zero and when there is a bar line (i.e., when"
+               " @code{whichBar} is set).  It is put on top of all staves,"
+               " and appears only at the left side of the staff.  The staves"
+               " are taken from @code{stavesFound}, which is maintained by"
+               " @ref{Staff_collecting_engraver}.",
+
+               /* create */
+               "BarNumber ",
+
+               /* read */
+               "currentBarNumber "
+               "whichBar "
+               "stavesFound "
+               "barNumberVisibility ",
+
+               /* write */
+               ""
+               );