[Lilypond-auto] Issue 3731 in lilypond: Patch: Adds outside-staff-interface and outside-staff-axis-group-interface

[lilypond]

Status: Started
Owner: address@hidden
Labels: Type-Enhancement Patch-new

New issue 3731 by address@hidden: Patch: Adds outside-staff-interface and  
outside-staff-axis-group-interface
http://code.google.com/p/lilypond/issues/detail?id=3731

Adds outside-staff-interface and outside-staff-axis-group-interface

When a property exists in an interface, the property should make sense for
a sensible of grobs that implement that interface.  Otherwise, the property
should be part of a separate interface that applies to a sensibly-sized
group of grobs.

Various properties having to do with outside-staff calculations belong to
grob-interface.  This does not make sense for many grobs (StaffSpacing,
NoteSpacing, SpacingSpanner, StaffSymbol just to name a few).  There is a
limited collection of grobs for which outside-staff properties make sense.
The outside-staff-interface provides a separate interface to be implemented
by these grobs.

The same is true for axis groups that place outside-staff grobs, which form
a limited subset of grobs implementing the axis-group-interface.  Rather  
than
putting the relevant properties in the axis-group-interface, we move
them to an outside-staff-axis-group-interface.

http://codereview.appspot.com/37950044

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