Re: avoid alignment of hairpin and dynamic text

[Jean Abou Samra]

Le 31/01/2021 à 11:09, Werner LEMBERG a écrit :

> > At least I have not found a way to fix it easily :-(
>
> To answer my own question: No, it can't be fixed as outlined above.
> Reason is that the order of events at a given moment is not specified.
> This means that it is not possible to make a reliable distinction
> between
>
>     \f \< ... \breakDynamicSpan \p \< ... \f
>
> and
>
>     \f \< ... \p \breakDynamicSpan \< ... \f
>
> However, I could imagine that a property `no-dynamic-span` gets added
> to the `DynamicText` grob.  The `Dynamic_align_engraver` checks this
> while creating a `DynamicLineSpanner` grob; if set, the `DynamicText`
> grob is not added as a child to `DynamicLineSpanner`.
>

Hi Werner,

Are you sure about the order of events not being
guaranteed? I am surprised; I had inferred the
contrary from

http://lilypond.org/doc/v2.22/Documentation/contributor/articulations-on-eventchord

specifically the last sentence:

  [...] (except in cases where the order of events matters).

And if I write:

\new Voice \with {
  \consists
    #(lambda (context)
       (define (db event)
         (ly:message "~s"
                     (ly:music-property
                       (ly:event-property event 'music-cause)
                       'name)))
       (make-engraver
         (listeners
            ((absolute-dynamic-event engraver event)
               (db event))
            ((span-dynamic-event engraver event)
               (db event))
            ((break-dynamic-span-event engraver event)
               (db event)))))
}
%\displayMusic
{
  c'1\f\<
  c'\p\breakDynamicSpan\<
  c'\f\<
  c'\breakDynamicSpan\p
}


I do see the events happening in the right order:

AbsoluteDynamicEvent

CrescendoEvent

AbsoluteDynamicEvent

BreakDynamicSpanEvent

CrescendoEvent

AbsoluteDynamicEvent

CrescendoEvent

BreakDynamicSpanEvent

AbsoluteDynamicEvent

Not that this is a proof of it being true in general.
It would be nice to figure this out.

Thanks,
Jean