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
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... < 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
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