[NTG-context] Re: Breakable tcolorbox in ConTeXt

[Florent Michel <florent.m42@gmail.com>]

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Thank you very much Hans for your clear and detailed reply!
I can confirm that this resolves my issue - and I really
like the flexibility that this syntax provides!

Best regards,
Florent

Le dim. 11 août 2024 à 12:18, Hans Hagen via ntg-context <ntg-context@ntg.nl>
a écrit :

> On 8/11/2024 11:24 AM, Florent Michel wrote:
> > Hi,
> >
> > I am trying to reproduce the behaviour of the tcolorbox LaTeX package,
> > more specifically breakable boxes (as illustrated here:
> > https://tex.stackexchange.com/a/676607/123770
> > <https://tex.stackexchange.com/a/676607/123770>). It works nicely out
> of
> > the box (pun intended) using `\definetextbackground` and drawing the
> > frame with MetaPost, using counters to keep track of whether the current
> > text is at the top, middle, or bottom of the box. However, I'm having
> > issues when one box ends and another starts on the same page (see more
> > details below). From what I understand, the issue is that counters seem
> > to be updated on a page-wide basis, so each MPgraphic ‘sees’ the values
> > of counters at the end of the current page, which may not be right if
> > another box modifies them. Would anyone know how to resolve this?
> >
> > Based on two answer on TeX StackExchange
> > (https://tex.stackexchange.com/a/486124/123770
> > <https://tex.stackexchange.com/a/486124/123770> ,
> >
> https://tex.stackexchange.com/questions/377234/context-frame-problems/377261#377261
> <
> https://tex.stackexchange.com/questions/377234/context-frame-problems/377261#377261>),
> the following code works well if there is no more than one box per page:
> >
> > ```
>
> You're missing a feature:
>
> this is the original trick:
>
> if     multilocs[i] == 1 :  % begin
> elseif multilocs[i] == 2 :  % between
> elseif multilocs[i] == 3 :  % end
> fi ;
>
> and in lmtx we have
>
> if      multikind[i] = "single" :
> elseif  multikind[i] = "first"  :
> elseif  multikind[i] = "middle" :
> elseif  multikind[i] = "last"   :
>
> Also:
>
>       path p;
>        p := ( llcorner multipars[i]
>               -- lrcorner multipars[i]
>               -- urcorner multipars[i]
>               -- ulcorner multipars[i]
>               -- cycle )
>               enlarged (EmWidth,EmWidth) ;
>        fill p withcolor boxfillcolor ;
>
> can be
>
> fill multipars[i] enlarged (EmWidth,EmWidth) ...
>
> Hans
>
>
> -----------------------------------------------------------------
>                                            Hans Hagen | PRAGMA ADE
>                Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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> -----------------------------------------------------------------
>
>
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