[NTG-context] framed parameter

Hans van der Meer hansm at science.uva.nl
Fri Jun 30 21:35:42 CEST 2006


On Jun 30, 2006, at 19:05, Hans Hagen wrote:

> Hans van der Meer wrote:
>> Just curious, because the last of the three examples solves the  
>> problem.
>>
>> Why is it that this is allowed in the parameter list of \framed:
>>
>> \framed[frame=on,\iftrue width=3cm\fi]{abc}
> i would not use that kind of tricks, since it's pure luck if it works
>>
>> But this gives an error:
>> \framed[frame=on,\iftrue background=color,backgroundcolor=green\fi] 
>> {abc}
> because a , is seen and it separates the if from the fi
>>
>> ! Incomplete \if; all text was ignored after line 42.
>> <inserted text>
>> � � � � � � � � \fi
>> <*> test.tex
>> � � � � � �� emergencyend
>> ?
>>
>> Allthough�this works and solves the problem I had:
>> \framed[frame=on,background=\iftrue color\else
>> none\fi,backgroundcolor=green]{abc}
>>
>> Is this somewhat inconsistent behaviour intrinsic to some  
>> parameters?�
>> I thought all parameters are picked up by a macro and then stashed  
>> away.
> indeed
>
> btw background=none will trigger an overlay called 'none', when  
> defined
>
> why do you need such tricks?
>

I want to switch runtime between colors. The switching occurs inside  
the execution of a \halign template.
By the way, your remark about triggering an overlay seems to the point.
What then if I want nothing as background color that then will  
obviously be more efficient?

Hans van der Meer





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