Interesting, thanks David.
Cheers,
Pierre
2015-03-08 16:52 GMT+01:00 David Nalesnik <david.nales...@gmail.com>:
> 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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