[NTG-context] [ \startTEXpage with \strut ]

[NTG-context] [ \startTEXpage with \strut ]

[vm via ntg-context]

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Trying to get a single page of a specific size, I set the width and 
height of \startTEXpage only to find out that a \strut as a last command 
before the \stopTEXpage, will expand the height.

8<----

\setuppapersize [A2]
\starttext
\startTEXpage[offset=0mm, width=220mm, height=110mm]
MWE without \type{\strut}  -> Landscape (220 × 110 mm)
%MWE with \type{\strut}  -> Landscape (220 × 111 mm)
%\strut
\stopTEXpage
\stoptext

--->8

There if probably a reason to it,
so I'd like to know why it works as it does.

.F

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[NTG-context] Re: [ \startTEXpage with \strut ]

[Wolfgang Schuster]

vm via ntg-context schrieb am 07.12.2024 um 09:10:
> Trying to get a single page of a specific size, I set the width and 
> height of \startTEXpage only to find out that a \strut as a last 
> command before the \stopTEXpage, will expand the height.
>
> 8<----
>
> \setuppapersize [A2]
> \starttext
> \startTEXpage[offset=0mm, width=220mm, height=110mm]
> MWE without \type{\strut}  -> Landscape (220 × 110 mm)
> %MWE with \type{\strut}  -> Landscape (220 × 111 mm)
> %\strut
> \stopTEXpage
> \stoptext
>
> --->8

The problem here is "\pack_framed_initialize" which was added in LMTX 
and causes a problem with the parameter handler.

%%%% page-app.mkxl
\def\page_fitting_start_normal
    {\setbox\b_page_fitting\hbox
       \bgroup
       \inheritedfittingpageframed
       \bgroup
       \pack_framed_initialize
       \ignorepars} % \gobblespacetokens} brr also gobbles next assingment
%%%%

When you compare the output of the following two boxes you will notice 
the second box has a depth (the part below the dashed line) while the 
first one hasn't.

This happens only when you set an instance for the frame because now 
ConTeXt fails to use the default value for "bottom".

When you now remove "\csname pack_framed_initialize\endcsname" from the 
example or add "bottom=\vss" to \setuptest the second box has the 
correct height.

%%%% begin example
\unprotect

\installnamespace                      {test}
\installframedcommandhandler \????test {test} \????test

\protect

\starttext

\setuptest
   [frame=off,
    offset=overlay,
    align=normal,
    width=4cm,
    height=4cm]

\start \showboxes

\let\currenttest\empty

\setbox\scratchbox\hbox\bgroup
   \inheritedtestframed\bgroup
     \csname pack_framed_initialize\endcsname
     \strut xxx
   \egroup
\egroup

\box\scratchbox

\definetest[foo]

\def\currenttest{foo}

\setbox\scratchbox\hbox\bgroup
   \inheritedtestframed\bgroup
     \csname pack_framed_initialize\endcsname
     \strut xxx
   \egroup
\egroup

\box\scratchbox

\stop

\stoptext
%%%% end example

Wolfgang

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