2 auto-change-iterator.cc -- implement Auto_change_iterator
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
10 #include "direction.hh"
11 #include "international.hh"
13 #include "music-wrapper-iterator.hh"
15 class Auto_change_iterator : public Music_wrapper_iterator
18 DECLARE_SCHEME_CALLBACK (constructor, ());
20 Auto_change_iterator ();
23 virtual void do_quit ();
24 virtual void construct_children ();
25 virtual void process (Moment);
26 vector<Pitch> pending_pitch (Moment) const;
30 void change_to (Music_iterator *, SCM, string);
38 Auto_change_iterator::change_to (Music_iterator *it, SCM to_type_sym,
41 Context *current = it->get_outlet ();
45 Cut & Paste from Change_iterator (ugh).
47 TODO: abstract this function
50 /* find the type of translator that we're changing.
52 If \translator Staff = bass, then look for Staff = *
54 while (current && !current->is_alias (to_type_sym))
57 current = current->get_parent_context ();
60 if (current && current->id_string () == to_id)
63 msg += _f ("can't change, already in translator: %s", to_id);
71 = it->get_outlet ()->find_create_context (to_type_sym, to_id, SCM_EOL);
73 send_stream_event (last, "ChangeParent", get_music ()->origin (),
74 ly_symbol2scm ("context"), dest->self_scm ());
79 We could change the current translator's id, but that would make
89 Auto_change_iterator::process (Moment m)
91 Music_wrapper_iterator::process (m);
93 Moment now = get_outlet ()->now_mom ();
95 if (start_moment_.main_part_.is_infinity () && start_moment_ < 0)
98 for (; scm_is_pair (split_list_); split_list_ = scm_cdr (split_list_))
100 splitm = unsmob_moment (scm_caar (split_list_));
101 if ((*splitm + start_moment_) > now)
104 SCM tag = scm_cdar (split_list_);
105 Direction d = to_dir (tag);
107 if (d && d != where_dir_)
110 string to_id = (d >= 0) ? "up" : "down";
111 change_to (child_iter_,
112 ly_symbol2scm ("Staff"),
118 Auto_change_iterator::Auto_change_iterator ()
121 split_list_ = SCM_EOL;
125 Auto_change_iterator::construct_children ()
127 split_list_ = get_music ()->get_property ("split-list");
128 start_moment_ = get_outlet ()->now_mom ();
130 SCM props = get_outlet ()->get_property ("trebleStaffProperties");
131 Context *up = get_outlet ()->find_create_context (ly_symbol2scm ("Staff"),
134 props = get_outlet ()->get_property ("bassStaffProperties");
135 Context *down = get_outlet ()->find_create_context (ly_symbol2scm ("Staff"),
138 up_.set_context (up);
139 down_.set_context (down);
141 Context *voice = up->find_create_context (ly_symbol2scm ("Voice"),
144 Music_wrapper_iterator::construct_children ();
148 Auto_change_iterator::do_quit ()
151 down_.set_context (0);
154 IMPLEMENT_CTOR_CALLBACK (Auto_change_iterator);