Re: Tunable vs. internal properties

[Patrick McCarty]

Hi Neil,

On Sun, Dec 21, 2008 at 12:32 PM, Neil Puttock <address@hidden> wrote:
>
> 2008/12/21 Patrick McCarty <address@hidden>:
>>
>> How are tunable and internal properties distinguished in the source
>> code?  I am speaking of both context properties and grob properties.
>>
>> I can see that they are hardcoded in scm/define-context-properties.scm
>> and scm/define-grob-properties.scm, but I am having trouble
>> understanding how some properties are "tunable" but others are not.
>
>> Can anyone point me to specific functions I should be looking for (in
>> either C++ or Scheme)?
>
> I think the only way is to pick a property, and based on how it's
> defined in the relevant .scm file, look at the code to see how it's
> used.
>
> For example, we recently had a discussion about multi-measure rests,
> where it's not possible to use breve rests for bars greater in length
> than 4/2.  This behaviour is controlled in the engraver by setting the
> property 'use-breve-rest, which the multi-measure-rest-interface reads
> later when deciding what type of rest to print.  Since the property
> setting takes place later than is possible using \override in a .ly
> file, it's not user-serviceable, hence why it's classed as an internal
> property.

Thanks for your explanation.  Time to study the code some more.  :-)

BTW, I think I these properties need to be moved from "internal
backend" to "user backend":

- circled-tip
- padding-pairs
- skyline-horizontal-padding

Thanks,
Patrick