[dev-context] pack-lyr.mkiv

[Hans Hagen]

On 9-3-2012 09:15, Wolfgang Schuster wrote:
> Hi Hans,
>
> when you process the following example you can see that the layer box is positioned in MkII at the top of the page but in MkIV at the bottom, why has this changed?
>
> \definelayer[test][width=\paperwidth,height=22mm,option=test]
>
> \setlayer[test][x=104mm,y=11mm]{\externalfigure[cow][width=56mm]}
>
> \setupbackgrounds[page][background=test]
>
> \starttext
>
> Hello
>
> \stoptext
>
> The change happened in this code block where you moved \vss from the bottom of the box to the top:

indeed ... the problem is that in some case we work ulx,uly and in 
others bottom top (as positions are llx,lly) ... and I need to find a 
solution that works for both cases

> \def\pack_layers_flush_indeed#1#2% quite core, so optimized
>    {\begingroup % already grouped
>     ...
>     \ifx\p_pack_layers_option\v!test \ruledvbox \else \vbox \fi \ifx\p_pack_layers_method\v!overlay to \overlayheight \fi \layoutcomponentboxattribute
>       {\vss
>        \hbox \ifx\p_pack_layers_method\v!overlay to \overlaywidth \fi
>          {\box\nextbox
>           \hss}%
>        }%\vss}%
>     ...
>     \endgroup}
>
> Wolfgang
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