/*
- item.cc -- implement Item
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997 Han-Wen Nienhuys <hanwen@stack.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 "p-score.hh"
-#include "debug.hh"
#include "item.hh"
-#include "p-col.hh"
-#include "elem-group.hh"
-Item::Item()
+#include "axis-group-interface.hh"
+#include "paper-score.hh"
+#include "warn.hh"
+#include "paper-column.hh"
+#include "lily-guile.hh"
+#include "system.hh"
+#include "pointer-group-interface.hh"
+
+#include "moment.hh"
+
+Grob *
+Item::clone () const
{
- breakable_b_ = false;
- break_status_i_ = 0;
- pcol_l_ = 0;
- broken_to_a_[0] = broken_to_a_[1]=0;
+ return new Item (*this);
}
-IMPLEMENT_IS_TYPE_B1(Item, Score_elem);
+Item::Item (SCM s)
+ : Grob (s)
+{
+ broken_to_drul_[LEFT] = broken_to_drul_[RIGHT] = 0;
+ cached_pure_height_valid_ = false;
+}
-void
-Item::do_print() const
+/**
+ Item copy ctor. Copy nothing: everything should be an elt property
+ or a special purpose pointer (such as broken_to_drul_[]) */
+Item::Item (Item const &s)
+ : Grob (s)
{
-#ifndef NPRINT
- mtor << "(unknown)";
-#endif
+ broken_to_drul_[LEFT] = broken_to_drul_[RIGHT] = 0;
+ cached_pure_height_valid_ = false;
}
+bool
+Item::is_non_musical (Grob *me)
+{
+ Item *i = dynamic_cast<Item *> (me->get_parent (X_AXIS));
+ return i ? Item::is_non_musical (i) : to_boolean (me->get_property ("non-musical"));
+}
+
+Paper_column *
+Item::get_column () const
+{
+ Item *parent = dynamic_cast<Item *> (get_parent (X_AXIS));
+ return parent ? parent->get_column () : 0;
+}
-Real
-Item::hpos_f()const
+System *
+Item::get_system () const
{
- return pcol_l_->hpos_f_ + absolute_coordinate(X_AXIS);
+ Grob *g = get_parent (X_AXIS);
+ return g ? g->get_system () : 0;
}
-Line_of_score *
-Item::line_l()const
+void
+Item::copy_breakable_items ()
{
- return pcol_l_->line_l_;
+ Drul_array<Item *> new_copies;
+ for (LEFT_and_RIGHT (d))
+ {
+ Grob *dolly = clone ();
+ Item *item = dynamic_cast<Item *> (dolly);
+ get_root_system (this)->typeset_grob (item);
+ new_copies[d] = item;
+ }
+
+ broken_to_drul_ = new_copies;
}
-int
-Item::break_status_i() const
+bool
+Item::is_broken () const
{
- return break_status_i_;
+ return broken_to_drul_[LEFT] || broken_to_drul_[RIGHT];
}
+/*
+ Generate items for begin and end-of line.
+*/
void
-Item::copy_breakable_items()
-{
- if ( broken_to_a_[0] || broken_to_a_[1] )
- return;
- Item *new_copies[2];
- for (int i=0; i < 2; i++) {
- Item * item_p = clone()->item();
- item_p->copy_dependencies(*this);
-
- item_p->break_status_i_ = -1+ 2*i;
- pscore_l_->typeset_item(item_p, pcol_l_);
- item_p->handle_prebroken_dependencies();
- new_copies[i] =item_p;
+Item::discretionary_processing ()
+{
+ if (is_broken () || original ())
+ return;
+
+ if (Item::is_non_musical (this))
+ copy_breakable_items ();
+}
+
+Grob *
+Item::find_broken_piece (System *l) const
+{
+ if (get_system () == l)
+ return (Item *) (this);
+
+ for (LEFT_and_RIGHT (d))
+ {
+ Grob *s = broken_to_drul_[d];
+ if (s && s->get_system () == l)
+ return s;
+ }
+
+ return 0;
+}
+
+Item *
+Item::find_prebroken_piece (Direction d) const
+{
+ Item *me = (Item *) (this);
+ if (!d)
+ return me;
+ return dynamic_cast<Item *> (broken_to_drul_[d]);
+}
+
+Direction
+Item::break_status_dir () const
+{
+ if (original ())
+ {
+ Item *i = dynamic_cast<Item *> (original ());
+
+ return (i->broken_to_drul_[LEFT] == this) ? LEFT : RIGHT;
}
- broken_to_a_= new_copies;
+ else
+ return CENTER;
}
void
-Item::do_breakable_col_processing()
+Item::handle_prebroken_dependencies ()
{
- if (!breakable_b_ || !pcol_l_->breakable_b())
- return;
+ Grob::handle_prebroken_dependencies ();
- copy_breakable_items();
- handle_prebroken_dependencies();
+ /*
+ Can't do this earlier, because try_visibility_lambda () might set
+ the elt property transparent, which would then be copied.
+ */
+ if (!Item::break_visible (this))
+ suicide ();
+}
- /*
- Otherwise the broken items won't be pre_process()'ed.
- */
- add_dependency( broken_to_a_[0] );
- add_dependency( broken_to_a_[1] );
+bool
+Item::break_visible (Grob *g)
+{
+ Item *it = dynamic_cast<Item *> (g);
+ SCM vis = g->get_property ("break-visibility");
+ if (scm_is_vector (vis))
+ return to_boolean (scm_c_vector_ref (vis, it->break_status_dir () + 1));
+ return true;
+}
+
+bool
+Item::pure_is_visible (int start, int end) const
+{
+ SCM vis = get_property ("break-visibility");
+ if (scm_is_vector (vis))
+ {
+ int pos = 1;
+ int pc_rank = Paper_column::get_rank (get_column ());
+ if (pc_rank == start)
+ pos = 2;
+ else if (pc_rank == end)
+ pos = 0;
+ return to_boolean (scm_vector_ref (vis, scm_from_int (pos)));
+ }
+ return true;
+}
+Interval_t<int>
+Item::spanned_rank_interval () const
+{
+ int c = get_column ()->get_rank ();
+ return Interval_t<int> (c, c);
}
-Item*
-Item::find_prebroken_piece(Line_of_score*l) const
+Interval_t<Moment>
+spanned_time_interval (Item *l, Item *r)
{
- if (line_l() == l)
- return (Item*)this;
- else if (broken_to_a_[0] && broken_to_a_[0]->line_l() == l)
- return broken_to_a_[0];
- else if (broken_to_a_[1] && broken_to_a_[1]->line_l() == l)
- return broken_to_a_[1];
+ Drul_array<Item *> bounds (l, r);
+ Interval_t<Moment> iv;
+
+ for (LEFT_and_RIGHT (d))
+ {
+ if (bounds[d] && bounds[d]->get_column ())
+ iv[d] = robust_scm2moment (bounds[d]->get_column ()->get_property ("when"),
+ iv[d]);
+ }
- return 0;
+ for (LEFT_and_RIGHT (d))
+ {
+ if (!bounds[d] || !bounds[d]->get_column ())
+ iv[d] = iv[-d];
+ }
+
+ return iv;
}
-Item*
-Item::find_prebroken_piece(PCol*c)const
+void
+Item::derived_mark () const
{
- if (c == pcol_l_ )
- return (Item *) this; // ugh
+ if (broken_to_drul_[LEFT])
+ scm_gc_mark (broken_to_drul_[LEFT]->self_scm ());
+ if (broken_to_drul_[RIGHT])
+ scm_gc_mark (broken_to_drul_[RIGHT]->self_scm ());
+}
- if (c == pcol_l_->prebreak_p_)
- return (Item *) broken_to_a_[0];
- else if (c==pcol_l_->postbreak_p_)
- return (Item *)broken_to_a_[1];
+Item *
+unsmob_item (SCM s)
+{
+ return dynamic_cast<Item *> (unsmob_grob (s));
+}
+
+Interval
+Item::pure_height (Grob *g, int start, int end)
+{
+ if (cached_pure_height_valid_)
+ return cached_pure_height_ + pure_relative_y_coordinate (g, start, end);
+ /* Note: cached_pure_height_ does not notice if start changes, implicitly
+ assuming that Items' pure_heights do not depend on 'start' or 'end'.
+ Accidental_interface::pure_height(), however, does depend on 'start'.
+ */
- assert(false);
+ cache_pure_height (Grob::pure_height (this, start, end));
+ return cached_pure_height_ + pure_relative_y_coordinate (g, start, end);
}
void
-Item::handle_prebroken_dependencies()
+Item::cache_pure_height (Interval height)
{
- if ( breakable_b_ )
- Score_elem::handle_prebroken_dependencies();
+ cached_pure_height_ = height;
+ cached_pure_height_valid_ = true;
}
+
+ADD_INTERFACE (Item,
+ "Grobs can be distinguished in their role in the horizontal"
+ " spacing. Many grobs define constraints on the spacing by"
+ " their sizes, for example, note heads, clefs, stems, and all"
+ " other symbols with a fixed shape. These grobs form a"
+ " subtype called @code{Item}.\n"
+ "\n"
+ "Some items need special treatment for line breaking. For"
+ " example, a clef is normally only printed at the start of a"
+ " line (i.e., after a line break). To model this,"
+ " @q{breakable} items (clef, key signature, bar lines, etc.)"
+ " are copied twice. Then we have three versions of each"
+ " breakable item: one version if there is no line break, one"
+ " version that is printed before the line break (at the end of"
+ " a system), and one version that is printed after the line"
+ " break.\n"
+ "\n"
+ "Whether these versions are visible and take up space is"
+ " determined by the outcome of the @code{break-visibility}"
+ " grob property, which is a function taking a direction"
+ " (@w{@code{-1}}, @code{0} or@tie{}@code{1}) as an argument. It"
+ " returns a cons of booleans, signifying whether this grob"
+ " should be transparent and have no extent.\n"
+ "\n"
+ "The following variables for @code{break-visibility} are"
+ " predefined:\n"
+ "@example\n"
+ " grob will show: before no after\n"
+ " break break break\n"
+ " all-invisible no no no\n"
+ " begin-of-line-visible no no yes\n"
+ " end-of-line-visible yes no no\n"
+ " all-visible yes yes yes\n"
+ " begin-of-line-invisible yes yes no\n"
+ " end-of-line-invisible no yes yes\n"
+ " center-invisible yes no yes\n"
+ "@end example",
+
+ /* properties */
+ "break-visibility "
+ "extra-spacing-height "
+ "extra-spacing-width "
+ "non-musical "
+ );
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