[NTG-context] About testing rest of space on a page

[Wolfgang Schuster]

Taco Hoekwater schrieb am 30.07.2020 um 09:05:
>> On 29 Jul 2020, at 23:08, Willi Egger <context at boede.nl> wrote:
>>
>> Good evening!
>>
>> I have a bookproject in which sections are ended with a small graphical element. Now as usual this graphic might be moved to a new page which is of course unwanted.
>>
>> At this moment I have:
>>
>> \startsetups endsection
>>   \vfil
>>   \placefigure[middle,none][]{}{\externalfigure[ornament2][height=2\lineheight]}
>>   \stopsection
>> \stopsetups
>>
>> \def\stopmysection{\setups{endsection}}
>>
>> I use then instead of \stopsection the \stopmysection. This works except that the ornament is in some cases placed on the next page. — My question is whether it is possible to do a \testpage and evaluate the result hereof and then using either the placement of the ornament and stop the section or just end the section without ornament?
> You can put your setups *inside* the test:
>
>    \definepagechecker
>      [willi]
>      [method=1,before=,after=,inbetween={\setups{endsection}}]
>
>    \def\stopmysection
>      {\checkpage[willi][lines=4]}
>
> The before=/after= pair is used when a page break is forced by the test, inbetween= is used if there is no forced break.
>
> (\testpage is a wrapper around \checkpage:
>   https://source.contextgarden.net/page-brk.mkiv?search=testpage#l564 )

No need for a new \stop command.

\setuphead
   [section]
   [aftersection={\checkpage[willi][lines=4]}]

Wolfgang