Re: mirrored leftmarginwidth in enumerations

[Wolfgang Schuster <schuster.wolfgang@gmail.com>]

Am 30.03.2014 um 20:00 schrieb Sanjoy Mahajan <sanjoy@MIT.EDU>:

> If anyone has a suggestion for putting enumeration texts toward the
> right edge of the left margin, I would be grateful.
> 
> In MkII enumerations, I would put a triangle (fig.2) in the left margin
> using
> 
> \defineenumeration
>  [pause]
>  [title=no,
>    text={\externalfigure[fig.2][height=1em]},
>    location=inleft,
>    number=no,
>  ]
> 
> The triangle was automatically aligned toward the right side of the left
> margin (fill glue on the left), which was what I wanted, on even and odd
> pages.
> 
> In MkIV, the marginal text is automatically aligned to the left side.
> I restored the MkII effect using this hack (using a > instead of the
> triangle, to make the example more self contained):
> 
> \defineenumeration
>  [pause]
>  [title=no,
>   text={\hbox to \leftmarginwidth{\hfil $>$}},
>    number=no,
>    alternative=inleft,
>  ]
> 
> But I just realized that the hack doesn't work for double-sided layouts.
> 
> Using the leftmarginwidth is correct on the odd pages, but it is too big
> for the even pages.  Thus, on page 2 of the example below, the >
> overlaps the "question" text.
> 
> Is there a more idiomatic MkIV replacement for my hack?  Or is my hack
> okay, but ConTeXt should be updated to interpret leftmarginwidth to mean
> "the leftmarginwidth, as appropriate for an odd or an even page"?
> 
> Here is the example:
> 
> \setuplayout[marking=on,location=middle,
>  backspace=1.25in,
>  leftmargindistance=0.125in, leftmargin=0.625in,
>  width=4.75in,
>  rightmargindistance=0.25in, rightmargin=0.25in,
> ]
> 
> \setuppagenumbering[alternative={doublesided}]
> 
> \defineenumeration
>  [pause]
>  [title=no,
>   text={\hbox to \leftmarginwidth{\hfil $>$}},
>    number=no,
>    alternative=inleft,
>  ]
> 
> \def\question#1{\startpause\relax #1 \stoppause}
> 
> \showframe
> 
> \starttext
> \question{hello}
> \page
> \question{hello}
> \stoptext

\defineenumeration
  [pause]
  [title=no,
   text={\symbol[triangle]},
   width=fit,
   number=no,
   alternative=inleft]

Wolfgang
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