Hi,
On Sun, Mar 8, 2015 at 9:35 AM, Pierre Perol-Schneider <
pierre.schneider.pa...@gmail.com> wrote:
> No clue.
> I just know that some grobs, like 'StaffSymbol' too, need to be reverted
> that way :
>
Consider this snippet:
\version "2.19.16"
#(define ledgerInfo
(lambda (grob)
(let* ((refp (ly:grob-system grob))
(all (ly:grob-array->list (ly:grob-object refp 'all-elements)))
(ledgers (filter (lambda (l)
(grob::has-interface l
'ledger-line-spanner-interface))
all)))
(display ledgers) (newline))))
\relative c' {
\override Staff.StaffSymbol.after-line-breaking =
#(lambda (grob) (display grob) (newline))
\override Staff.LedgerLineSpanner.after-line-breaking = #ledgerInfo
\override NoteHead.color = #grey
\override Stem.color = #grey
\override Staff.LedgerLineSpanner.color = #grey
\override Staff.StaffSymbol.color = #grey
a4 a a a
%\stopStaff
%\startStaff
\revert NoteHead.color
\revert Stem.color
\revert Staff.LedgerLineSpanner.color
\revert Staff.StaffSymbol.color
%\startStaff
a a a a
}
%%%%%%%%
Notice that with the \stopStaff and \startStaff commented out, there is a
single StaffSymbol grob in the example. It makes sense that any override
will apply to the whole object. When \stopStaff and \startStaff are in
effect, a second StaffSymbol grob is created, and it can of course take a
new override or revert.
Very surprisingly, there is only a single LedgerLineSpanner per StaffSymbol
object! This means that any override of LedgerLineSpanner will affect all
of them.
--David
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