X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fitem.cc;h=635ea2f1f52304446b660276b3d76490f5f49e51;hb=b1a521c92717244d4bff11bb0b2b1304e4355956;hp=e35ab294463451bdbe5dde17530f961744a6c3ff;hpb=d8018dfc750f1dee8e1ee78a5d5f51b06d4c8348;p=lilypond.git diff --git a/lily/item.cc b/lily/item.cc index e35ab29446..635ea2f1f5 100644 --- a/lily/item.cc +++ b/lily/item.cc @@ -1,33 +1,229 @@ /* item.cc -- implement Item - source file of the LilyPond music typesetter + source file of the GNU LilyPond music typesetter - (c) 1997 Han-Wen Nienhuys + (c) 1997--2004 Han-Wen Nienhuys */ -#include "debug.hh" +#include "paper-score.hh" +#include "warn.hh" #include "item.hh" -#include "p-col.hh" +#include "paper-column.hh" +#include "spanner.hh" +#include "lily-guile.hh" +#include "system.hh" +#include "group-interface.hh" -Item::Item() +Item::Item (SCM s) + : Grob (s) { - pcol_l_ = 0; + broken_to_drul_[LEFT] = broken_to_drul_[RIGHT]=0; + Group_interface::add_thing (this, ly_symbol2scm ("interfaces"), ly_symbol2scm ("item-interface")); } -IMPLEMENT_STATIC_NAME(Item); +/** + Item copy ctor. Copy nothing: everything should be a elt property + or a special purpose pointer (such as broken_to_drul_[]) */ +Item::Item (Item const &s) + : Grob (s) +{ + broken_to_drul_[LEFT] = broken_to_drul_[RIGHT] =0; +} + + +bool +Item::is_breakable (Grob*me) +{ + if (me->original_) + return false; + + if (!dynamic_cast (me)) + me->programming_error ("only items can be breakable."); + + Item * i =dynamic_cast (me->get_parent (X_AXIS)); + return (i) ? Item::is_breakable (i) : to_boolean (me->get_property ("breakable")); +} + +Paper_column * +Item::get_column () const +{ + Item *parent = dynamic_cast (get_parent (X_AXIS)); + return parent ? parent->get_column () : 0; +} + +System * +Item::get_system () const +{ + Grob *g = get_parent (X_AXIS); + return g ? g->get_system () : 0; +} + + +void +Item::copy_breakable_items () +{ + Drul_array new_copies; + Direction i=LEFT; + do + { + Grob * dolly = clone (); + Item * item = dynamic_cast (dolly); + pscore_->system_->typeset_grob (item); + new_copies[i] =item; + } + while (flip (&i) != LEFT); + broken_to_drul_= new_copies; +} + + +bool +Item::is_broken () const +{ + return broken_to_drul_[LEFT] || broken_to_drul_[RIGHT]; +} + + +/* + Generate items for begin and end-of line. + */ +void +Item::discretionary_processing () +{ + if (is_broken ()) + return; + + if (Item::is_breakable (this)) + copy_breakable_items (); +} + +Grob* +Item::find_broken_piece (System*l) const +{ + if (get_system () == l) + return (Item*) (this); + + Direction d = LEFT; + do { + Grob *s = broken_to_drul_[d]; + if (s && s->get_system () == l) + return s; + } + while (flip (&d) != LEFT); + + return 0; +} + + +Item* +Item::find_prebroken_piece (Direction d) const +{ + Item * me = (Item *) (this); + if (!d) + return me; + return dynamic_cast (broken_to_drul_[d]); +} + + +Direction +Item::break_status_dir () const +{ + if (original_) + { + Item * i = dynamic_cast (original_); + + return (i->broken_to_drul_[LEFT] == this) ? LEFT : RIGHT; + } + else + return CENTER; +} void -Item::do_print() const +Item::handle_prebroken_dependencies () { -#ifndef NPRINT - mtor << "(unknown)"; -#endif + Grob::handle_prebroken_dependencies (); + + /* + Can't do this earlier, because try_visibility_lambda () might set + the elt property transparent, which would then be copied. + + TODO: + + give the item to break-visibility itself, so the function can do + more complicated things. + */ + SCM vis = get_property ("break-visibility"); + if (gh_procedure_p (vis)) + { + SCM args = scm_list_n (gh_int2scm (break_status_dir ()), SCM_UNDEFINED); + SCM result = gh_apply (vis, args); + bool trans = gh_scm2bool (ly_car (result)); + bool empty = gh_scm2bool (ly_cdr (result)); + + if (empty && trans) + suicide (); + else if (empty) + { + set_extent (SCM_EOL, X_AXIS); + set_extent (SCM_EOL, Y_AXIS); + } + else if (trans) + set_property ("print-function", SCM_EOL); + } } +SCM +Item::do_derived_mark ()const +{ + 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 ()); + return SCM_EOL; +} -Real -Item::hpos_f()const +Item* +unsmob_item (SCM s ) { - return pcol_l_->hpos + offset().x; + return dynamic_cast (unsmob_grob (s)); } + + + +ADD_INTERFACE (Item, + "item-interface", + "\n" + "\n" + "Grobs can be distinguished in their role in the horizontal spacing.\n" + "Many grobs define constraints on the spacing by their sizes. For\n" + "example, note heads, clefs, stems, and all other symbols with a fixed\n" + "shape. These grobs form a subtype called @code{Item}.\n" + "\n" + "\n" + "Some items need special treatment for line breaking. For example, a\n" + "clef is normally only printed at the start of a line (i.e. after a\n" + "line break). To model this, `breakable' items (clef, key signature,\n" + "bar lines, etc.) are copied twice. Then we have three versions of each\n" + "breakable item: one version if there is no line break, one version\n" + "that is printed before the line break (at the end of a system), one\n" + "version that is printed after the line break.\n" + "\n" + "Whether these versions are visible and take up space, is determined by\n" + "the outcome of the @code{break-visibility}. This grob property is a\n" + "function taking a direction (-1, 0 or 1) as argument. It returns a\n" + "cons of booleans, signifying whether this grob should be transparent\n" + "and have no extent.\n" + "\n" + "The following variables for 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" + "@end example\n" + , + "no-spacing-rods break-visibility breakable")