Re: Translator todos

[Han-Wen Nienhuys]

Erik Sandberg schreef:

> OK. Should I try to do the same for created grobs, too? It shouldn't be that 
> difficult, just add some code to the make_item macro, which registers an init 
> function that adds the symbol to a list. There will be problems with a few 
> engravers (piano-pedal and system-start-delimiter), but those should be 
> solvable.

Hi,

I had a brief thought over this. It would be possible to do this, by 
changing the mechanics of creating grobs. Rather than doing

  clef = make_item("Clef", cause)

we should use C++ function that have a similar mechanism to listners and 
acknowledgers, ie.


  DECLARE_CREATOR(clef);


  ..

  clef = make_clef (cause);
  ..

using some layers, make_clef will call

  Grob *
  Clef_engraver::create_clef (SCM cause)
  {
    return make_item ("Clef", cause);
  }

Of course, this is the standard, default case, which would be 
      done with a IMPLEMENT_DEFAULT_CREATOR() macro.

However, if we have this, it would be feasible to register/override 
Scheme functions for creation, eg.

  \set Staff.clefEngraverClefCreator =
  #(lambda (context cause . other_args)
    (let*
     ((c (ly:context-make-grob context 'Clef)))

     (ly:grob-set-property! c 'cause cause)
     c))

this would make it possible to softcode loads of functionality, in terms 
of connecting grobs and setting grob properties.

--
Han-Wen Nienhuys - address@hidden - http://www.xs4all.nl/~hanwen

LilyPond Software Design
 -- Code for Music Notation
http://www.lilypond-design.com