Re: Symmetrical layer positioning?

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

2007/7/17, Giuseppe Bilotta <gip.bilotta@iol.it>:
> Monday, July 16, 2007 Giuseppe Bilotta wrote:
>
> > Monday, July 16, 2007 Aditya Mahajan wrote:
>
> >> On Mon, 16 Jul 2007, Giuseppe Bilotta wrote:
>
> >>> Hello all,
> >>>
> >>> is there a "secret power switch" to tell ConTeXt that a
> >>> particular layer has different positioning depending on
> >>> wether it's on a left or right page?
>
> >> You can possible use setups and use \doifoddpageelse to set the
> >> layers. See
>
> >> http://archive.contextgarden.net/thread/20061102.171506.2fa793e2.en.html
>
> > Thanks a lot. I don't know if using presets is actually
> > going to reduce the coding, though.
>
> > In the mean time, I've found that layers have a doublesided
> > option. This apparently allows you to override the
> > left/right settings of a layer, so I tried
>
> > \definelayer[title][
> >   x=\dimexpr\backspace+\wdall-\wdtit,
> >   y=\topspace,
> >   width=\wdtit,
> >   height=\httit,
> >   state=repeat,
> >   doublesided=true,
> > ]
>
> > \setuplayer[lefttitle][
> >   x=\backspace,
> > ]
>
> > \definelayer[desc][
> >   x=\backspace,
> >   y=\topspace,
> >   width=\wddesc,
> >   height=\htdesc,
> >   state=repeat,
> >   doublesided=true,
> > ]
>
> > \setuplayer[leftdesc][
> >   x=\dimexpr\backspace+\wdall-\wddesc,
> > ]
>
> > \definelayer[figs][
> >   x=\dimexpr\backspace+\wdall-\wdfig,
> >   y=\dimexpr\topspace+\makeupheight-\htfig,
> >   width=\wdfig,
> >   height=\htfig,
> > ]
>
> > \setuplayer[leftfigs][
> >   x=\backspace,
> > ]
>
> > \setupbackgrounds[page][background={color,title,desc,figs},backgroundcolor=elux-ultralight]
>
>
> > However, the 'main' setup is always used, the left one is
> > never used. Am I doing something wrong?
>
> Apparently, I mistook what the doublesided option does for
> layers. I've currently solved the problem in the following
> way:

\definelayer[test][doublesided=yes]

\setlayer[test][odd][..,..=..,..]{content}

\setlayer[test][even][..,..=..,..]{content}

Wolfgang

> \unexpanded\def\titlexpos{%
>   \ifodd\realpageno\dimexpr\wdinside+\wdall-\wdtit\else\wdinside\fi
> }
>
> \definelayer[title][
>   x=\titlexpos,
>   y=\topspace,
>   width=\wdtit,
>   height=\httit,
> ]
>
> \unexpanded\def\descxpos{%
>   \ifodd\realpageno\wdinside\else\dimexpr\wdinside+\wdall-\wddesc\fi
> }
>
> \definelayer[desc][
>   x=\descxpos,
>   y=\topspace,
>   width=\wddesc,
>   height=\htdesc,
> ]
>
> \unexpanded\def\figsxpos{%
>   \ifodd\realpageno\dimexpr\backspace+\wdall-\wdfig\else\wdinside\fi
> }
>
> \definelayer[figs][
>   x=\figsxpos,
>   y=\dimexpr\topspace+\makeupheight-\htfig,
>   width=\wdfig,
>   height=\htfig,
> ]
>
> \setupbackgrounds[page][background={color,title,desc,figs},backgroundcolor=elux-ultralight]
>
>
> However, this solution doesn't strike me as particularly
> elegant. I've seen in page-lyr.tex that support for
> left/right layers is currently in progress, but if I read
> the code correctly it just creates three layers (name,
> leftname, rightname) and they have to be filled
> individually. It would be nice to have a simpler interface
> to repeated layers with position recalculated on each page.
>
> --
> Giuseppe "Oblomov" Bilotta
>
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