2 auto-change-iterator.cc -- implement Auto_change_iterator
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "translator-group.hh"
13 #include "music-wrapper-iterator.hh"
14 #include "direction.hh"
16 class Auto_change_iterator : public Music_wrapper_iterator
19 VIRTUAL_COPY_CONS (Music_iterator);
20 DECLARE_SCHEME_CALLBACK(constructor, ());
22 Auto_change_iterator ();
25 virtual void construct_children ();
26 virtual void process (Moment);
27 Array<Pitch> pending_pitch (Moment)const;
31 void change_to (Music_iterator* , SCM, String);
37 Auto_change_iterator::change_to (Music_iterator *it, SCM to_type_sym,
40 Translator_group * current = it->report_to ();
41 Translator_group * last = 0;
44 Cut & Paste from Change_iterator (ugh).
46 TODO: abstract this function
49 /* find the type of translator that we're changing.
51 If \translator Staff = bass, then look for Staff = *
53 while (current && !current->is_alias (to_type_sym))
56 current = current->daddy_trans_;
59 if (current && current->id_string_ == to_id)
62 msg += _ ("Can't switch translators, I'm there already");
68 Translator_group * dest =
69 it->report_to ()->find_create_translator (to_type_sym, to_id, SCM_EOL);
70 current->remove_translator (last);
71 dest->add_used_group_translator (last);
76 We could change the current translator's id, but that would make
87 Auto_change_iterator::process (Moment m)
89 Music_wrapper_iterator::process (m);
92 Moment now = report_to ()->now_mom ();
95 for (; gh_pair_p (split_list_); split_list_ = gh_cdr (split_list_))
97 splitm = unsmob_moment (gh_caar (split_list_));
101 SCM tag = gh_cdar (split_list_);
102 Direction d = to_dir (tag);
104 if (d && d != where_dir_)
107 String to_id = (d >= 0) ? "up" : "down";
108 change_to (child_iter_,
109 ly_symbol2scm ("Staff"),
115 Auto_change_iterator::Auto_change_iterator ()
118 split_list_ = SCM_EOL;
122 Auto_change_iterator::construct_children ()
124 Music_wrapper_iterator::construct_children ();
125 split_list_ = get_music ()->get_mus_property ("split-list");
128 IMPLEMENT_CTOR_CALLBACK (Auto_change_iterator);