[frogs] Re: Add option to indicate frets by letters in tablature(issue164063)

[Carl Sorensen <c_sorensen@xxxxxxx>]

On 12/7/09 5:03 AM, "Trevor Daniels" <t.daniels@xxxxxxxxxxx> wrote:

> Carl
> 
> I think I need some froggy help!
> 
> You asked
> 
>>> The fretLabels list wouldn't need to
>>> be characters; they could be markups or stencils, so users could
>>> define whatever is needed or desired.
> 
> and I replied
> 
>> I'll look at implementing markups.
> 
> but I can't find an example of mixing strings and
> markup in a property to crib from, and I can't see
> how to identify a markup or how to process it, other
> than looking for a string starting "\markup".


I don't think there's anything special to do in terms of mixing strings or
markups in a property.  The property is just a list.

When it's time to display, you can use the string? and markup? predicates to
decide whether a given fretLabel is a string or a markup, if you need to.

Actually, as I read the code, you don't need to do anything, because
make-vcenter-markup just does interpret-markup on its argument (see
scm/define-markup-commands.scm and search for vcenter to see how this
works).  So interpret-markup will operate on the argument (either a string
or a markup) and create a stencil.

Has this helped?

Thanks,

Carl


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