text-spanner-interface
generic text spanner
User settable properties:
     
bound-padding (number)- The amount of padding to insert around spanner bounds. 
 bracket-flare (pair of numbers)- A pair of numbers specifying how
much edges of brackets should slant outward.  Value 0.0 means straight
edges
 dash-fraction (number)- Size of the dashes, relative to
dash-period. Should be between 0.0 (no line) and 1.0 (continuous
line). 
 dash-period (number)- the length of one dash + white space. If
negative, no line is drawn at all. 
 edge-height (pair)- A pair of number specifying the heights of
the vertical edges '(left-height . right-height). 
 edge-text (pair)- A pair specifying the texts to be set at the
edges '(left-text . right-text). 
 enclose-bounds (number)- How much of the bound a spanner should enclose:
+1 = completely, 0 = center, -1 not at all. 
 shorten-pair (pair of numbers)- The lengths to shorten a
text-spanner on both sides, for example a pedal bracket.  Positive values
shorten the text-spanner, while negative values lengthen it. 
 style (symbol)- This setting determines in what style a grob is
typeset. Valid choices depend on the 
stencil callback reading
this property. 
 thickness (number)- Line thickness, generally measured in
line-thickness. 
 
   This grob interface is used in the following graphical objects: SustainPedal, TextSpanner and TrillSpanner