Hi,
I'm thinking about collecting some (and hopefully a growing corpus) of
the functions that help dealing with grobs in callback functions and
make them accessible in an openLilyLib package. For example for so many
applications it is necessary to find a grob's system, then get all
objects within that and find specific ones within that list. Or find the
NoteColumn's at the two ends of a spanner, etc. I think making such
patterns more accessible with functions is a way for me to become more
comfortable with this type of grob manipulation, and maybe it will be
useful to make this area somewhat more accessible for an (even if only
slightly) wider audience.
I know that some functions can only be called before or after certain
points in the engraving process. For example all information about the
absolute positioning of grobs is only available after-line-breaking,
while some actions (e.g. setting properties like 'X-offset) will only
have an effect before-line-breaking (whereas one can set the 'color
property at any time).
I have two questions about this for now:
1. Is there a list somewhere detailing *all* available callbacks?
2. Is there anything general to say about when callbacks for regular
properties like e.g. 'direction or 'X-offset. I mean, if I say
\override DynamicText.X-offset = #my-custom-callback, when will that be
called?
Best
Urs
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