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

[lilypond.git] / lily / stem-engraver.cc

diff --git a/lily/stem-engraver.cc b/lily/stem-engraver.cc
index 6890b5b041c410f56186d1c8733eb4613e313179..199d9fd17ea735d1a1c2308324938d694268e208 100644 (file)
--- a/lily/stem-engraver.cc
+++ b/lily/stem-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.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
@@ -38,34 +38,43 @@ class Stem_engraver : public Engraver
 {
   Grob *stem_;
   Grob *tremolo_;
+  vector <Grob *> maybe_flags_;
   Stream_event *rhythmic_ev_;
   Stream_event *tremolo_ev_;
+  bool tuplet_start_;
 
   TRANSLATOR_DECLARATIONS (Stem_engraver);
 
 protected:
-  void make_stem (Grob_info);
+  void make_stem (Grob_info, bool);
 
-  DECLARE_TRANSLATOR_LISTENER (tremolo);
-  DECLARE_ACKNOWLEDGER (rhythmic_head);
+  void listen_tremolo (Stream_event *);
+  void listen_tuplet_span (Stream_event *);
+  void acknowledge_rhythmic_head (Grob_info);
   void stop_translation_timestep ();
+  void finalize ();
+  void kill_unused_flags ();
 };
 
-Stem_engraver::Stem_engraver ()
+Stem_engraver::Stem_engraver (Context *c)
+  : Engraver (c)
 {
   tremolo_ev_ = 0;
   stem_ = 0;
   tremolo_ = 0;
   rhythmic_ev_ = 0;
+  tuplet_start_ = false;
 }
 
 void
-Stem_engraver::make_stem (Grob_info gi)
+Stem_engraver::make_stem (Grob_info gi, bool tuplet_start)
 {
   /* Announce the cause of the head as cause of the stem.  The
      stem needs a rhythmic structure to fit it into a beam.  */
   stem_ = make_item ("Stem", gi.grob ()->self_scm ());
-
+  if (tuplet_start)
+    stem_->set_property ("tuplet-start", SCM_BOOL_T);
+  (void) make_item ("StemStub", gi.grob ()->self_scm ());
   if (tremolo_ev_)
     {
       /* Stem tremolo is never applied to a note by default,
@@ -76,24 +85,14 @@ Stem_engraver::make_stem (Grob_info gi)
 
          the first and last (quarter) note both get one tremolo flag.  */
       int requested_type
-        = robust_scm2int (tremolo_ev_->get_property ("tremolo-type"), 0);
-      SCM f = get_property ("tremoloFlags");
-      if (!requested_type)
-        {
-          if (scm_is_number (f))
-            requested_type = scm_to_int (f);
-          else
-            requested_type = 8;
-        }
-      else
-        context ()->set_property ("tremoloFlags", scm_from_int (requested_type));
+        = robust_scm2int (tremolo_ev_->get_property ("tremolo-type"), 8);
 
       /*
         we take the duration log from the Event, since the duration-log
         for a note head is always <= 2.
       */
       Stream_event *ev = gi.event_cause ();
-      Duration *dur = unsmob_duration (ev->get_property ("duration"));
+      Duration *dur = unsmob<Duration> (ev->get_property ("duration"));
 
       int tremolo_flags = intlog2 (requested_type) - 2
                           - (dur->duration_log () > 2 ? dur->duration_log () - 2 : 0);
@@ -126,12 +125,12 @@ Stem_engraver::acknowledge_rhythmic_head (Grob_info gi)
   Stream_event *cause = gi.event_cause ();
   if (!cause)
     return;
-  Duration *d = unsmob_duration (cause->get_property ("duration"));
+  Duration *d = unsmob<Duration> (cause->get_property ("duration"));
   if (!d)
     return;
 
   if (!stem_)
-    make_stem (gi);
+    make_stem (gi, tuplet_start_);
 
   int ds = Stem::duration_log (stem_);
   int dc = d->duration_log ();
@@ -158,11 +157,40 @@ Stem_engraver::acknowledge_rhythmic_head (Grob_info gi)
     }
 
   Stem::add_head (stem_, gi.grob ());
+
+  if (Stem::is_normal_stem (stem_)
+      && Stem::duration_log (stem_) > 2
+      && !(unsmob<Grob> (stem_->get_object ("flag"))))
+    {
+      Item *flag = make_item ("Flag", stem_->self_scm ());
+      flag->set_parent (stem_, X_AXIS);
+      stem_->set_object ("flag", flag->self_scm ());
+      maybe_flags_.push_back (flag);
+    }
+  if (tuplet_start_)
+    stem_->set_property ("tuplet-start", SCM_BOOL_T);
+}
+
+void
+Stem_engraver::kill_unused_flags ()
+{
+  for (vsize i = 0; i < maybe_flags_.size (); i++)
+    if (unsmob<Grob> (maybe_flags_[i]->get_parent (X_AXIS)->get_object ("beam")))
+      maybe_flags_[i]->suicide ();
+}
+
+void
+Stem_engraver::finalize ()
+{
+  kill_unused_flags ();
 }
 
 void
 Stem_engraver::stop_translation_timestep ()
 {
+  if (scm_is_string (get_property ("whichBar")))
+    kill_unused_flags ();
+
   tremolo_ = 0;
   if (stem_)
     {
@@ -181,31 +209,53 @@ Stem_engraver::stop_translation_timestep ()
         }
       stem_ = 0;
     }
+  tuplet_start_ = false;
   tremolo_ev_ = 0;
 }
 
-IMPLEMENT_TRANSLATOR_LISTENER (Stem_engraver, tremolo);
+void
+Stem_engraver::listen_tuplet_span (Stream_event *ev)
+{
+  Direction dir = to_dir (ev->get_property ("span-direction"));
+  if (dir == START)
+    {
+      // set stem property if stem already exists
+      if (stem_)
+        stem_->set_property ("tuplet-start", SCM_BOOL_T);
+      tuplet_start_ = true;  // stash the value for use in later creation
+    }
+}
+
 void
 Stem_engraver::listen_tremolo (Stream_event *ev)
 {
   ASSIGN_EVENT_ONCE (tremolo_ev_, ev);
 }
 
-ADD_ACKNOWLEDGER (Stem_engraver, rhythmic_head);
+
+void
+Stem_engraver::boot ()
+{
+  ADD_LISTENER (Stem_engraver, tuplet_span);
+  ADD_LISTENER (Stem_engraver, tremolo);
+  ADD_ACKNOWLEDGER (Stem_engraver, rhythmic_head);
+}
 
 ADD_TRANSLATOR (Stem_engraver,
                 /* doc */
-                "Create stems and single-stem tremolos.  It also works"
+                "Create stems, flags and single-stem tremolos.  It also works"
                 " together with the beam engraver for overriding beaming.",
 
                 /* create */
+                "Flag "
                 "Stem "
+                "StemStub "
                 "StemTremolo ",
 
                 /* read */
-                "tremoloFlags "
                 "stemLeftBeamCount "
-                "stemRightBeamCount ",
+                "stemRightBeamCount "
+                "whichBar ",
 
                 /* write */
                 ""