2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2005--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
20 #include "paper-column-engraver.hh"
22 #include "international.hh"
23 #include "accidental-placement.hh"
24 #include "accidental-interface.hh"
25 #include "axis-group-interface.hh"
27 #include "note-spacing.hh"
28 #include "paper-column.hh"
29 #include "pointer-group-interface.hh"
30 #include "separation-item.hh"
31 #include "staff-spacing.hh"
35 #include "translator.icc"
37 Paper_column_engraver::Paper_column_engraver ()
39 last_moment_.main_part_ = Rational (-1, 1);
45 made_columns_ = false;
49 Paper_column_engraver::finalize ()
52 progress_indication ("[" + to_string (breaks_) + "]");
57 SCM m = now_mom ().smobbed_copy ();
58 command_column_->set_property ("when", m);
59 musical_column_->set_property ("when", m);
64 // At the end of the score, allow page breaks and turns by default, but...
65 command_column_->set_property ("page-break-permission", ly_symbol2scm ("allow"));
66 command_column_->set_property ("page-turn-permission", ly_symbol2scm ("allow"));
68 // ...allow the user to override them.
69 handle_manual_breaks (true);
71 // On the other hand, line breaks are always allowed at the end of a score,
72 // even if they try to stop us.
73 if (!scm_is_symbol (command_column_->get_property ("line-break-permission")))
74 command_column_->set_property ("line-break-permission", ly_symbol2scm ("allow"));
76 system_->set_bound (RIGHT, command_column_);
81 Paper_column_engraver::make_columns ()
86 Paper_column *p1 = make_paper_column ("NonMusicalPaperColumn");
87 Paper_column *p2 = make_paper_column ("PaperColumn");
89 The columns are timestamped with now_mom () in
90 stop_translation_timestep. Cannot happen now, because the
91 first column is sometimes created before now_mom is initialised.
98 Paper_column_engraver::initialize ()
100 system_ = dynamic_cast<System *> (unsmob_grob (get_property ("rootSystem")));
103 system_->set_bound (LEFT, command_column_);
104 command_column_->set_property ("line-break-permission", ly_symbol2scm ("allow"));
108 Paper_column_engraver::acknowledge_item (Grob_info gi)
110 items_.push_back (gi.item ());
114 Paper_column_engraver::acknowledge_staff_spacing (Grob_info gi)
116 Pointer_group_interface::add_grob (command_column_,
117 ly_symbol2scm ("spacing-wishes"),
122 Paper_column_engraver::acknowledge_note_spacing (Grob_info gi)
124 Pointer_group_interface::add_grob (musical_column_,
125 ly_symbol2scm ("spacing-wishes"),
130 Paper_column_engraver::set_columns (Paper_column *new_command,
131 Paper_column *new_musical)
133 command_column_ = new_command;
134 musical_column_ = new_musical;
136 context ()->set_property ("currentCommandColumn", new_command->self_scm ());
139 context ()->set_property ("currentMusicalColumn", new_musical->self_scm ());
141 system_->add_column (command_column_);
142 system_->add_column (musical_column_);
145 IMPLEMENT_TRANSLATOR_LISTENER (Paper_column_engraver, break);
147 Paper_column_engraver::listen_break (Stream_event *ev)
149 break_events_.push_back (ev);
152 IMPLEMENT_TRANSLATOR_LISTENER (Paper_column_engraver, label);
154 Paper_column_engraver::listen_label (Stream_event *ev)
156 label_events_.push_back (ev);
160 Paper_column_engraver::handle_manual_breaks (bool only_do_permissions)
162 for (vsize i = 0; i < break_events_.size (); i++)
165 SCM name_sym = break_events_[i]->get_property ("class");
166 string name = ly_symbol2string (name_sym);
167 size_t end = name.rfind ("-event");
169 prefix = name.substr (0, end);
172 programming_error ("Paper_column_engraver doesn't know about this break-event");
176 string perm_str = prefix + "-permission";
177 string pen_str = prefix + "-penalty";
179 SCM cur_pen = command_column_->get_property (pen_str.c_str ());
180 SCM pen = break_events_[i]->get_property ("break-penalty");
181 SCM perm = break_events_[i]->get_property ("break-permission");
183 if (!only_do_permissions && scm_is_number (pen))
185 Real new_pen = robust_scm2double (cur_pen, 0.0) + scm_to_double (pen);
186 command_column_->set_property (pen_str.c_str (), scm_from_double (new_pen));
187 command_column_->set_property (perm_str.c_str (), ly_symbol2scm ("allow"));
190 command_column_->set_property (perm_str.c_str (), perm);
195 Paper_column_engraver::process_music ()
197 handle_manual_breaks (false);
199 for (vsize i = 0; i < label_events_.size (); i++)
201 SCM label = label_events_[i]->get_property ("page-label");
202 SCM labels = command_column_->get_property ("labels");
203 command_column_->set_property ("labels", scm_cons (label, labels));
206 bool start_of_measure = (last_moment_.main_part_ != now_mom ().main_part_
207 && !measure_position (context ()).main_part_);
210 We can't do this in start_translation_timestep (), since time sig
211 changes won't have happened by then.
213 if (start_of_measure)
215 Moment mlen = Moment (measure_length (context ()));
216 Grob *column = unsmob_grob (get_property ("currentCommandColumn"));
218 column->set_property ("measure-length", mlen.smobbed_copy ());
220 programming_error ("No command column?");
225 Paper_column_engraver::stop_translation_timestep ()
227 if (to_boolean (get_property ("skipTypesetting")))
230 SCM m = now_mom ().smobbed_copy ();
231 command_column_->set_property ("when", m);
232 musical_column_->set_property ("when", m);
234 for (vsize i = 0; i < items_.size (); i++)
236 Item *elem = items_[i];
237 Grob *col = Item::is_non_musical (elem) ? command_column_ : musical_column_;
239 if (!elem->get_parent (X_AXIS))
240 elem->set_parent (col, X_AXIS);
241 if (!unsmob_grob (elem->get_object ("axis-group-parent-X")))
242 elem->set_object ("axis-group-parent-X", col->self_scm ());
244 if (Accidental_placement::has_interface (elem))
245 Separation_item::add_conditional_item (col, elem);
246 else if (!Accidental_interface::has_interface (elem))
247 Separation_item::add_item (col, elem);
251 if (to_boolean (get_property ("forbidBreak"))
252 && breaks_) /* don't honour forbidBreak if it occurs on the first moment of a score */
254 command_column_->set_property ("page-turn-permission", SCM_EOL);
255 command_column_->set_property ("page-break-permission", SCM_EOL);
256 command_column_->set_property ("line-break-permission", SCM_EOL);
257 for (vsize i = 0; i < break_events_.size (); i++)
259 SCM perm = break_events_[i]->get_property ("break-permission");
260 if (perm == ly_symbol2scm ("force") || perm == ly_symbol2scm ("allow"))
261 warning (_ ("forced break was overridden by some other event, "
262 "should you be using bar checks?"));
265 else if (Paper_column::is_breakable (command_column_))
270 progress_indication ("[" + to_string (breaks_) + "]");
273 context ()->get_score_context ()->unset_property (ly_symbol2scm ("forbidBreak"));
276 label_events_.clear ();
278 SCM mpos = get_property ("measurePosition");
279 SCM barnum = get_property ("internalBarNumber");
280 if (unsmob_moment (mpos)
281 && scm_is_integer (barnum))
283 SCM where = scm_cons (barnum,
286 command_column_->set_property ("rhythmic-location", where);
287 musical_column_->set_property ("rhythmic-location", where);
292 Paper_column_engraver::start_translation_timestep ()
294 break_events_.clear ();
295 if (!first_ && !to_boolean (get_property ("skipTypesetting")))
298 made_columns_ = true;
302 ADD_ACKNOWLEDGER (Paper_column_engraver, item);
303 ADD_ACKNOWLEDGER (Paper_column_engraver, note_spacing);
304 ADD_ACKNOWLEDGER (Paper_column_engraver, staff_spacing);
306 ADD_TRANSLATOR (Paper_column_engraver,
308 "Take care of generating columns.\n"
310 "This engraver decides whether a column is breakable. The"
311 " default is that a column is always breakable. However,"
312 " every @code{Bar_engraver} that does not have a barline at a"
313 " certain point will set @code{forbidBreaks} in the score"
314 " context to stop line breaks. In practice, this means that"
315 " you can make a break point by creating a bar line (assuming"
316 " that there are no beams or notes that prevent a break"
321 "NonMusicalPaperColumn ",
328 "currentCommandColumn "
329 "currentMusicalColumn "