Re: Staff.alignAboveContext and volta brackets

[Mats Bengtsson]

Both problems pointed out in this thread show a limitation in
the handling of volta brackets. A volta bracket is only printed
over contexts where the property voltaOnThisStaff is set to true.
At the beginning of a score, this property is automatically
set to true for the topmost Staff context and false in all other
contexts. This works well for normal scores, but not in the two
situations brought up here:
- When the topmost Staff is removed from some lines when you
  use \RemoveEmptyStaffContext.
- When you add a new topmost Staff in the middle of a score using
  staffAlignAboveContext.

In the second case, it's simple enough for the user to set
voltaOnThisStaff manually and it could be enough to add a note
to the documentation about this issue.

However, in the case of \RemoveEmptyStaffContext it's more tricky
to work around it manually, since the user does not know in advance
exactly at which bar a Staff will disappear. So, this situation should
really be handled automatically.

   /Mats

Nicolas Sceaux wrote:
> "Stephen" <address@hidden> writes:
>
>
> > Why not start with all three staffs and remove the staff from the
> > first line?
> >
> > Using:
> >
> >   \layout {
> >      \context { \RemoveEmptyStaffContext }
> >  }
> >
> > Stephen 
>
>
> Because that does not work either. The "1." volta is not displayed.
>
>
>
> ------------------------------------------------------------------------
>
> \version "2.7.3"
>
> global = {
>   \override Score.RemoveEmptyVerticalGroup #'remove-first = ##t
>   s1
>   \set Score . repeatCommands = #'((volta "1."))
>   s1
>   \set Score . repeatCommands = #'((volta #f)) \bar "|."
>   s1
>   \bar "||" \break
>   \set Score . repeatCommands = #'((volta "2."))
>   s1
>   \set Score . repeatCommands = #'((volta #f))
>   s1
>   \bar "|."
> }
>
> \score {
>   \new StaffGroup <<
>     \new Staff <<
>       \global
>       { R1*3 \repeat unfold 2 g'1 }
>     >>
>     \new Staff <<
>       \global
>       \repeat unfold 5 e'1
>     >>
>     \new Staff <<
>       \global
>       \repeat unfold 5 c'1
>     >>
>   >>
>   \layout {
>     raggedright  = ##t
>     \context { \RemoveEmptyStaffContext }
>   }
> }
>
>
> ------------------------------------------------------------------------
>
>
> ------------------------------------------------------------------------
>
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--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
        Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================