Paul,
On Thu, Feb 25, 2016 at 11:08 AM, Paul Morris [via Lilypond] <
[email protected]> wrote:
> Hi Abraham,
>
> On Feb 25, 2016, at 12:28 PM, tisimst <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=187727&i=0>> wrote:
>
> I'm asking this because I know that if I can get my hands on a grob, I
> know how to access its properties (with ly:grob-property) and use that
> property's value to make a change if I want (e.g., with
> ly:grob-set-property!). I just don't know the equivalent process for
> getting my hands on a context to access its properties. I know there's
> ly:context-property, but I just don't have as much experience with it as
> normal grobs.
>
>
> You may want a custom engraver, as they have access to contexts and
> context properties.
>
> As I understand it there are three main ways of intervening:
>
> 1. music functions (and scheme, void, and markup functions)
> 2. custom engravers
> 3. grob property callback procedures
>
> 1: let you do fancy things with the input, early on, before LilyPond
> processes it
> 3: let you do things with graphical output very late in the game
> 2: are earlier than 3, exist within contexts and thus have access to
> context properties (and can do things with grobs as well like with 3)
>
> As far as I know context properties can’t be accessed from a grob callback
> and not from music functions as David has said. So that leaves custom
> engravers (although I don’t really know how \applyContext fits into this).
>
> Maybe that helps?
>
Very much! Thank you.
Best,
Abraham
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