Carl Sorensen schrieb:
[...]
The *specific* behavior you have requested can be achieved by the following:
#(define myBool #f)
myMusicFunc =
#(define-music-function (parser location) ()
#{
\once \override Slur #'dummyProperty = ##t
#})
#(define-public (slur::boolean grob)
;; just a test function to try and switch boolean values
(let ((my-prop (ly:grob-property grob 'dummyProperty #f)))
(display "\nWithin callback\n")
(display "my-prop: ")(display my-prop)(newline)
(if my-prop
(display "Actions for #t go here...")
(display "Actions for #f go here..."))
(set! myBool #f)
(display "myBool: ")(display myBool)(newline)
(ly:slur::print grob)))
\layout {
\context {
\Voice
\override Slur #'stencil = #slur::boolean
}
}
\relative c'' {
c4 ( c )
\myMusicFunc
c ( c )
c ( c )
\myMusicFunc
c ( c )
}
Ok, I played with your code - the result on console for my-prop is #f #t
#t #f,
but it should be #f #t #f #t, isn't it?
Marc
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