+vector<Grob *>
+System::get_footnote_grobs_in_range (vsize start, vsize end)
+{
+ vector<Grob *> out;
+ extract_grob_set (this, "footnotes-before-line-breaking", footnote_grobs);
+ for (vsize i = 0; i < footnote_grobs.size (); i++)
+ {
+ Grob *at_bat = footnote_grobs[i];
+ int pos = at_bat->spanned_rank_interval ()[LEFT];
+ bool end_of_line_visible = true;
+ if (Spanner *s = dynamic_cast<Spanner *>(at_bat))
+ {
+ Direction spanner_placement = robust_scm2dir (s->get_property ("spanner-placement"), LEFT);
+ if (spanner_placement == CENTER)
+ spanner_placement = LEFT;
+
+ pos = s->spanned_rank_interval ()[spanner_placement];
+ if (s->original ())
+ {
+ Spanner *orig = dynamic_cast<Spanner *>(s->original ());
+ at_bat = spanner_placement == LEFT ? orig->broken_intos_[0] : orig->broken_intos_.back ();
+ pos = at_bat->spanned_rank_interval ()[RIGHT];
+ }
+ }
+
+ if (Item *item = dynamic_cast<Item *>(at_bat))
+ {
+ /*
+ We use this to weed out grobs that fall at the end
+ of the line when we want grobs at the beginning.
+ */
+ end_of_line_visible = item->break_status_dir () == LEFT;
+
+ if (!Item::break_visible (item))
+ continue;
+ // safeguard to bring down the column rank so that end of line footnotes show up on the correct line
+ if (pos == int (start) && item->break_status_dir () != RIGHT)
+ continue;
+ if (pos == int (end) && item->break_status_dir () != LEFT)
+ continue;
+ if (pos != int (end) && pos != int (start) && item->break_status_dir () != CENTER)
+ continue;
+ }
+
+ if (pos < int (start))
+ continue;
+ if (pos > int (end))
+ continue;
+ if (pos == int (start) && end_of_line_visible)
+ continue;
+ if (pos == int (end) && !end_of_line_visible)
+ continue;
+ if (!at_bat->is_live ())
+ continue;
+ /*
+ TODO
+ Sometimes, there are duplicate entries in the all_elements_
+ list. In a separate patch, this practice should be squashed
+ so that the check below can be eliminated.
+ */
+ if (find (out.begin (), out.end (), at_bat) != out.end ())
+ continue;
+
+ out.push_back (at_bat);
+ }
+ return out;
+}
+
+vector<Real>
+System::get_footnote_heights_in_range (vsize start, vsize end)
+{
+ return internal_get_note_heights_in_range (start, end, true);
+}
+
+vector<Real>
+System::get_in_note_heights_in_range (vsize start, vsize end)
+{
+ return internal_get_note_heights_in_range (start, end, false);
+}
+
+vector<Real>
+System::internal_get_note_heights_in_range (vsize start, vsize end, bool foot)
+{
+ vector<Grob *> footnote_grobs = get_footnote_grobs_in_range (start, end);
+ vector<Real> out;
+
+ for (vsize i = footnote_grobs.size (); i--;)
+ if (foot
+ ? !to_boolean (footnote_grobs[i]->get_property ("footnote"))
+ : to_boolean (footnote_grobs[i]->get_property ("footnote")))
+ footnote_grobs.erase (footnote_grobs.begin () + i);
+
+ for (vsize i = 0; i < footnote_grobs.size (); i++)
+ {
+ SCM footnote_markup = footnote_grobs[i]->get_property ("footnote-text");
+
+ if (!Text_interface::is_markup (footnote_markup))
+ continue;
+
+ SCM props = scm_call_1 (ly_lily_module_constant ("layout-extract-page-properties"),
+ pscore_->layout ()->self_scm ());
+
+ SCM footnote_stl = Text_interface::interpret_markup (pscore_->layout ()->self_scm (),
+ props, footnote_markup);
+
+ Stencil *footnote_stencil = Stencil::unsmob (footnote_stl);
+ out.push_back (footnote_stencil->extent (Y_AXIS).length ());
+ }
+
+ return out;
+}
+
+vsize
+System::num_footnotes ()
+{
+ extract_grob_set (this, "footnotes-after-line-breaking", footnote_grobs);
+ return footnote_grobs.size ();
+}
+
+bool
+grob_2D_less (Grob *g1, Grob *g2)
+{
+ int sri[] = {0, 0};
+ Grob *gs[] = {g1, g2};
+
+ for (int i = 0; i < 2; i++)
+ {
+ sri[i] = gs[i]->spanned_rank_interval ()[LEFT];
+ if (Spanner *s = dynamic_cast<Spanner *> (gs[i]))
+ {
+ if (s->broken_intos_.size ())
+ s = (scm_to_int (s->broken_intos_[0]->get_property ("spanner-placement")) == LEFT
+ ? s->broken_intos_[0]
+ : s->broken_intos_.back ());
+ gs[i] = s;
+ if (robust_scm2double (s->get_property ("X-offset"), 0.0) > 0)
+ sri[i] = s->spanned_rank_interval ()[RIGHT];
+ }
+ }
+
+ if (sri[0] == sri[1])
+ return Grob::vertical_less (gs[0], gs[1]);
+
+ return sri[0] < sri[1];
+}
+
+MAKE_SCHEME_CALLBACK (System, footnotes_before_line_breaking, 1);
+SCM
+System::footnotes_before_line_breaking (SCM smob)
+{
+ Grob *me = Grob::unsmob (smob);
+ vector<Grob *> footnotes;
+ SCM grobs_scm = Grob_array::make_array ();
+ extract_grob_set (me, "all-elements", elts);
+ for (vsize i = 0; i < elts.size (); i++)
+ if (elts[i]->internal_has_interface (ly_symbol2scm ("footnote-interface")))
+ footnotes.push_back (elts[i]);
+
+ Grob_array::unsmob (grobs_scm)->set_array (footnotes);
+ return grobs_scm;
+}
+
+MAKE_SCHEME_CALLBACK (System, footnotes_after_line_breaking, 1);
+SCM
+System::footnotes_after_line_breaking (SCM smob)
+{
+ Spanner *sys_span = Spanner::unsmob (smob);
+ System *sys = dynamic_cast<System *> (sys_span);
+ Interval_t<int> sri = sys->spanned_rank_interval ();
+ vector<Grob *> footnote_grobs = sys->get_footnote_grobs_in_range (sri[LEFT], sri[RIGHT]);
+ vector_sort (footnote_grobs, grob_2D_less);
+
+ SCM grobs_scm = Grob_array::make_array ();
+ Grob_array::unsmob (grobs_scm)->set_array (footnote_grobs);
+ return grobs_scm;
+}
+
+MAKE_SCHEME_CALLBACK (System, vertical_skyline_elements, 1);
+SCM
+System::vertical_skyline_elements (SCM smob)
+{
+ Grob *me_grob = Grob::unsmob (smob);
+ vector<Grob *> vertical_skyline_grobs;
+ extract_grob_set (me_grob, "elements", my_elts);
+ for (vsize i = 0; i < my_elts.size (); i++)
+ if (System_start_delimiter::has_interface (my_elts[i]))
+ vertical_skyline_grobs.push_back (my_elts[i]);
+
+ System *me = dynamic_cast<System *> (me_grob);
+ Grob *align = Grob::unsmob (me->get_object ("vertical-alignment"));
+ if (!align)
+ {
+ SCM grobs_scm = Grob_array::make_array ();
+ Grob_array::unsmob (grobs_scm)->set_array (vertical_skyline_grobs);
+ return grobs_scm;
+ }
+
+ extract_grob_set (align, "elements", elts);
+
+ for (vsize i = 0; i < elts.size (); i++)
+ if (Hara_kiri_group_spanner::has_interface (elts[i]))
+ vertical_skyline_grobs.push_back (elts[i]);
+
+ SCM grobs_scm = Grob_array::make_array ();
+ Grob_array::unsmob (grobs_scm)->set_array (vertical_skyline_grobs);
+ return grobs_scm;
+}
+