lilypond-manuals.css: edit color scheme and some spacing

[lilypond.git] / lily / time-signature-engraver.cc

diff --git a/lily/time-signature-engraver.cc b/lily/time-signature-engraver.cc
index 75d803226ba608eaa17c7cbfc6e32ab371bc0b0d..e4e76e17d685154c2868ab75c2efd8d8feae5dbe 100644 (file)
--- a/lily/time-signature-engraver.cc
+++ b/lily/time-signature-engraver.cc
@@ -1,62 +1,139 @@
 /*
-  time_signature-reg.cc -- implement Time_signature_engraver
+  This file is part of LilyPond, the GNU music typesetter.
 
-  source file of the GNU LilyPond music typesetter
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-  (c)  1997--1998 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 "time-signature-engraver.hh"
-#include "time-signature.hh"
-#include "command-request.hh"
-#include "timing-engraver.hh"
 #include "engraver-group.hh"
 
-Time_signature_engraver::Time_signature_engraver()
-{ 
-  time_signature_p_ =0;
+#include "item.hh"
+#include "international.hh"
+#include "misc.hh"
+#include "moment.hh"
+#include "stream-event.hh"
+#include "warn.hh"
+
+#include "translator.icc"
+
+/**
+   generate time_signatures.
+*/
+class Time_signature_engraver : public Engraver
+{
+  Item *time_signature_;
+  SCM last_time_fraction_;
+  SCM time_cause_;
+
+protected:
+  virtual void derived_mark () const;
+  void stop_translation_timestep ();
+  void process_music ();
+public:
+  TRANSLATOR_DECLARATIONS (Time_signature_engraver);
+  void listen_time_signature (Stream_event *);
+};
+
+void
+Time_signature_engraver::derived_mark () const
+{
+  scm_gc_mark (last_time_fraction_);
+  scm_gc_mark (time_cause_);
+}
+
+Time_signature_engraver::Time_signature_engraver (Context *c)
+  : Engraver (c)
+{
+  time_signature_ = 0;
+  time_cause_ = SCM_EOL;
+  last_time_fraction_ = SCM_BOOL_F;
 }
 
 void
-Time_signature_engraver::do_process_requests()
+Time_signature_engraver::listen_time_signature (Stream_event *ev)
 {
-  Translator * result =
-    daddy_grav_l()->get_simple_translator (Timing_engraver::static_name());
+  time_cause_ = ev->self_scm ();
+}
 
-  if (!result)
+void
+Time_signature_engraver::process_music ()
+{
+  if (time_signature_)
+    return;
+
+  SCM fr = get_property ("timeSignatureFraction");
+  if (!scm_is_eq (last_time_fraction_, fr) && scm_is_pair (fr))
     {
-      warning (_ ("lost in time") + ": " + _ ("can't find") 
-        + " Timing_translator");
-      return ;
+      time_signature_ = make_item ("TimeSignature", time_cause_);
+      time_signature_->set_property ("fraction", fr);
+
+      if (scm_is_false (last_time_fraction_))
+        time_signature_->set_property ("break-visibility",
+                                       get_property ("initialTimeSignatureVisibility"));
+
+      int den = scm_to_int (scm_cdr (fr));
+      if (den != (1 << intlog2 (den)))
+        {
+          /*
+            Todo: should make typecheck?
+
+            OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
+          */
+          time_signature_->warning (_f ("strange time signature found: %d/%d",
+                                        int (scm_to_int (scm_car (fr))),
+                                        den));
+        }
+
+      last_time_fraction_ = fr;
     }
-  
-  Timing_engraver * timing_grav_l= (Timing_engraver*) result->engraver_l ();
-  
-  Time_signature_change_req *req = timing_grav_l->time_signature_req_l();
-  if (req)
+}
+
+void
+Time_signature_engraver::stop_translation_timestep ()
+{
+  if (time_signature_ && !scm_is_null (time_cause_))
     {
-      Array<Scalar> args;
-      args.push (req->beats_i_);
-      args.push (req->one_beat_i_);
-       
-      time_signature_p_ = new Time_signature (args);
-      time_signature_p_->break_priority_i_ = 1; // ugh
+      Moment *mp = unsmob<Moment> (get_property ("measurePosition"));
+      if (mp && (mp->main_part_ > Rational (0))
+          && !to_boolean (get_property ("partialBusy")))
+        time_signature_->warning ("mid-measure time signature without \\partial");
     }
 
-  if (time_signature_p_)
-    announce_element (Score_element_info (time_signature_p_, req));
+  time_signature_ = 0;
+  time_cause_ = SCM_EOL;
 }
 
 void
-Time_signature_engraver::do_pre_move_processing()
+Time_signature_engraver::boot ()
 {
-  if (time_signature_p_) 
-    {
-      typeset_element (time_signature_p_);
-      time_signature_p_ =0;
-    }
+  ADD_LISTENER (Time_signature_engraver, time_signature);
 }
 
+ADD_TRANSLATOR (Time_signature_engraver,
+                /* doc */
+                "Create a @ref{TimeSignature} whenever"
+                " @code{timeSignatureFraction} changes.",
+
+                /* create */
+                "TimeSignature ",
+
+                /* read */
+                "initialTimeSignatureVisibility "
+                "partialBusy "
+                "timeSignatureFraction ",
 
-ADD_THIS_TRANSLATOR(Time_signature_engraver);
-IMPLEMENT_IS_TYPE_B1(Time_signature_engraver,Engraver); 
+                /* write */
+                ""
+               );