Trevor Daniels schrieb:
[...]
From what I see on the console output, the calls of \myMusicFunc
are evaluated first, so myBool is #t and the callbacks come in action
afterwards (the first slur claims #t, every other slur reads #f), so
apparently they don't influence each other the way I expected them to
do.
That's right. AIUI, Music functions act on
the music stream, before layout commences, so
all music functions have completed before the
first callback. I don't know what you are
trying to do, but the example looks rather
like overriding a grob property might achieve
it.
Thank for clarification.
I think I have a solution for my specific problem, because it seems that
the callback
can change the value and for the next time called, he uses the proper
value, like this:
#(define-public (slur::boolean grob)
;; just a test function to try and switch boolean values
(display "\nWithin callback\n")
(display "myBool: ")(display myBool)(newline)
(if myBool
(set! myBool #f)
(set! myBool #t))
(display "myBool: ")(display myBool)(newline)
(ly:slur::print grob))
With this mechanism and some workarounds, I think I can solve my problem.
Marc
Trevor
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