Re: Clef support for cue notes (issue2726043)

[reinhold . kainhofer]

Reviewers: carl.d.sorensen_gmail.com, Valentin Villenave,  
graham_percival-music.ca, lemzwerg, james.lowe_datacore.com, Trevor  
Daniels, Neil Puttock,

Message:
On 2010/11/25 22:50:40, Neil Puttock wrote:
> I think there's some scope for reducing code duplication in the
engraver and
> parser-clef.scm.

In an ideal C++ world, that would be very easy by deriving
Cue_clef_engraver from Clef_engraver. However, in lilypond the engravers
should not have any hierarchy, so I don't see how I could easily share
some common functionality between two different engravers (where the
code accesses some class variables of the engravers).


Description:
Clef support for cue notes

-) Added \cleffedCueDuring, which allows to specify a clef for
   the cue notes. At the end of the cue section, the clef is
   automatically reset to the containing voice's clef.
-) Cue clefs are implemented as CueClef and CueEndClef grobs,
   created by a dedicated Cue_clef_engraver, which reads
   some cueClef* context properties.
-) After a line break, a cue clef does NOT override the global clef
   of the containing voice, but prints (in smaller size) after
   the containing clef.

Please review this at http://codereview.appspot.com/2726043/

Affected files:
  A input/regression/cue-clef.ly
  A lily/cue-clef-engraver.cc
  M lily/pitch-scheme.cc
  M ly/engraver-init.ly
  M ly/music-functions-init.ly
  M scm/define-context-properties.scm
  M scm/define-grobs.scm
  M scm/music-functions.scm
  M scm/parser-clef.scm