Re: printing "a 2" at the beginning of staves automatically

[Jean Abou Samra]

Le 23/05/2022 à 08:55, Werner LEMBERG a écrit :
> Aaand some nits :-)
> * Contrary to Valentin's solution, the first 'a 2' text is not
>    left-aligned to the left edge of the note head.  This is especially
>    visible with whole notes (see attached image).  It is not clear to
>    me why this is so, given that text is left-aligned if I do
>
>    ```
>    \override TextSpanner.bound-details.left.text = "rit."
>    c’1\startTextSpan
>    ```
>
>    for example.



See the attached file, fixing that problem and making it
per-voice.



> * `\tweak` doesn't work right before `\set Staff.staffAnnotation`.
>    Instead, I have to use `\once \override`, AFAICS.



It actually never makes sense to \tweak a \set. \tweak
takes an event and changes a property of any grob that
has been created from this event. The \set merely modifies
a context property. It doesn't itself lead to the grob:
the engraver notices that the property has been modified
(it could have been modified with means other than \set,
like ly:context-set-property! in another engraver), and
that leads it to decide it should create a grob. The underlying
problem is that this functionality should really be implemented
with an event, but there is currently no interface for
defining new event types (you have to tamper with internals
in ways that are not proof to upgrades), so I prefer to avoid
it if possible.



>    Hopefully, I'm missing something.  Otherwise both Valentin's and
>    Jeans' solutions are heavily limited because it happens quite often
>    that the 'a 2' string must be positioned individually without
>    affecting other rehearsal marks – or text spanners.


What do you mean by 'positioned individually'? Can
you give an example?


This question also still stands:


> > Very nice, thanks!  Besides the (hopefully) harmless warning
> >
> > ```
> > programming error: Spanner `TextSpanner' is not fully contained
> >                     in parent spanner.  Ignoring orphaned part
> > continuing, cross fingers
> > ```
> >
> > it seems to work fine.
> >
> >
> >      Werner
>
>
> Can you give an example where it occurs?



Best,
Jean