stacking

Hi list,

I want to show snippets of text on a slide and then add some other 
snippets of the same text on the next slide. Then, restart with some new 
text, on a „cleared“ slide.

Example:

Slide 1: English _______ difficult.
Slide 2: English   is    difficult.
Slide 3: ______ English classes ______ Mick ______ fun.
Slide 4:   The  English classes  with  Mick  are   fun.

Let’s call „question1“ what is to be printed on slide 1.
Let’s call „answer1“ what is to be added to that on slide 2.
Let’s call „question2“ what is to be printed on slide 3.
Let’s call „answer2“ what is to be added to that on slide 4.
And so on.

My first attempt is with stacking.

It works so far, the only problem I couldn’t solve is how to 
„clear“ the space used up by previous questions (and their answers). 
Is there a specific way to do this with stacking? I was not successful 
in finding documentation about stacking.




\definecolor [orange_color] [x=ffe29f]
\definecolor [turquise_color] [x=9fffdc]

\define\nr{2} %number of questions

\starttext

\dorecurse{\nr}{
\definestacking[question#1]
\definestacking[answer#1]
} %end of \dorecurse

\startbuffer

\stacking[question1]{This is my first question (question1).} 
\stacking[answer1]{This is my first answer (answer1).} 
\stacking[question1]{And here is another part of the first question 
(question1).} \stacking[answer1]{And here's another part of the first 
answer (answer1).}

\stacking[question2]{This is my second question (question2).} 
\stacking[answer2]{This is my second answer (answer2).}

\stopbuffer

\dorecurse{\nr}{

\startTEXpage[offset=1ts,frame=on,framecolor=orange_color,rulethickness=.5ts] 
\setupstacking[criterium={question#1}]     \getbuffer \stopTEXpage

\startTEXpage[offset=1ts,frame=on,framecolor=turquise_color,rulethickness=.5ts] 
\setupstacking[criterium={question#1,answer#1}] \getbuffer \stopTEXpage

} %end of \dorecurse

\stoptext



And then I tried to include a counter, so that I can re-arrange the 
order of the questions with just cutting and pasting them somewhere else 
in the source code, without the need to manually edit the number of the 
question (even better than that would be a randomizer for the order of 
the questions). Below is my attempt with the counter, which 
unfortunately doesn’t work. Maybe it’s a matter of when the counter 
variable is stored / updated.



\definecolor [orange_color] [x=ffe29f]
\definecolor [turquise_color] [x=9fffdc]

\directlua{
numberofquestions = 2
counter = 1
}

\define\q{question\directlua{tex.print(counter)}}
\define\a{answer\directlua{tex.print(counter)}}

\starttext

\dorecurse{\directlua{tex.print(numberofquestions)}}{
\definestacking[question#1]
\definestacking[answer#1]
} %end of \dorecurse

\startbuffer

\stacking[\q]{This is my first question (\q).} \stacking[\a]{This is my 
first answer (\a).}

\directlua{counter = counter + 1}

\stacking[\q]{This is my second question (\q).} \stacking[\a]{This is my 
second answer (\a).}

\stopbuffer

\dorecurse{\directlua{tex.print(numberofquestions)}}{

\startTEXpage[offset=1ts,frame=on,framecolor=orange_color,rulethickness=.5ts] 
\setupstacking[criterium={question#1}]     \getbuffer \stopTEXpage

\startTEXpage[offset=1ts,frame=on,framecolor=turquise_color,rulethickness=.5ts] 
\setupstacking[criterium={question#1,answer#1}] \getbuffer \stopTEXpage

} %end of \dorecurse

\stoptext

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