Hi Kieren, hi David K.,
applyContext is good for doing somethind conditionally anywhere in the
music stream:
cond = ##t
mod = \with { \override NoteHead #'color = #red }
\relative c' {
c4 e g b \applyContext #(lambda (context) (if cond
(ly:context-mod-apply! context mod))) c a f d c1
}
I think, for your idea of automatically changing properties in a
context, you will need an engraver.
One thing to consider is writing a scheme-function-provider with
define-scheme-function, that returns an engraver using a provided
condition-function and a provided context-mod-function.
To reduce the scheme-scarriness, this engraver-provider could use
parameters for the context-property to watch and the contaxt-mod to
apply in the case of a change.
Of course, the more generic this shall be, the less scheme can be hidden
from the user. If the changed property shall be used in the action, that
is triggered, a scheme function cannot be avoided, I think.
I will think about this and will see, if I can make a demo of this.
Cheers, Jan-Peter
Am 26.02.2013 21:59, schrieb Kieren MacMillan:
Hi David,
Isn't that what
\applyContext
is for, without the need for any engraver?
I don't know — is it?
How about giving an example, so we can see if it is.
Thanks,
Kieren.
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