Thanks Hans! This is great. I made a slight change to add an additional
feature. By moving the “mysolution” definition out of \startmode[solution], I
can now use mysolution in either mode. I’d use this if I want to give my
solution to one of the problems, as an example, on the handout.
-Gavin
% \enablemode[solution]
% Define "mysolution” for use independent of solution mode.
\definenarrower[mysolution]
[before=\blank\it,
after=\blank]
% If in solution mode, define "solution" to use "mysolution"
\startmode[solution]
\tolerant\protected\def\startsolution[#1]%
{\startmysolution}
\protected\def\stopsolution
{\stopmysolution}
\stopmode
% If NOT in solution mode, define "solution" to produce a blank space
\startnotmode[solution]
\tolerant\protected\def\startsolution[#1]%
{\doifelsenothing{#1}{\blank[1in]}{\blank[#1]}
\gobbleuntil\stopsolution}
\protected\def\stopsolution
{}
\stopnotmode
\starttext
How many roads?
\startsolution
42 roads.
\stopsolution
How much wood?
\startsolution[1.5in]
Alotta wood!
\stopsolution
No more questions.
\stoptext
> On Jan 11, 2022, at 1:13 PM, Hans Hagen <j.ha...@xs4all.nl> wrote:
>
> On 1/11/2022 8:50 PM, Gavin via ntg-context wrote:
>> Hello List,
>> I am making problem sets for a physics class. Solutions use the style
>> defined in the example below, and only appear if the “solution” mode is
>> enabled. I am struggling to get a vertical space for the solution which is
>> the same whether or not the solution is printed. Different problems require
>> different amounts of space, so this should be an argument or key-value.
>> In the example below, the first solution has the desired behavior. The
>> second solution has the syntax I’d like, but it doesn’t make the space
>> without a solution.
>> Any ideas would be welcome! I am still pretty new to ConTeXt, so I struggle
>> mixing things like the plain tex \vbox and ConTeXt \start…\stop concepts.
>> Thanks,
>> Gavin
>> \definemode[solution][yes] % yes to enable solutions, no to disable
>> \definebuffer [solution] % Captures solution in a buffer that isn't used
>> \startmode[solution] % If in solution mode, redefine
>> \startsolution...\stopsolution
>> \definedelimitedtext[solution][ % Solution italic and indented
>> spacebefore=medium,
>> spaceafter=medium,
>> style=\rm\it,
>> leftmargin=standard, % Indents block on the left
>> rightmargin=yes, % Indents block on the right
>> indentnext=no,
>> before=\vbox to 1in\bgroup,
>> after=\egroup,
>> ]
>> \stopmode
>> \starttext
>> How many roads? (The 1-inch space below appears whether or not it contains a
>> solution.)
>> \vbox to 1in{%
>> \startsolution
>> 42 roads.
>> \stopsolution
>> }
>> How much wood? (I would like to define solution so this to behaves like the
>> previous question.)
>> \startsolution[1in]
>> Alotta wood!
>> \stopsolution
>> No more questions.
>> \stoptext
> a mix between big and low level
>
> % \enablemode[solution]
>
> \startmode[solution] % If in solution mode, redefine
> \startsolution...\stopsolution
>
> \definenarrower
> [mysolution]
> [before=\blank,
> after=\blank]
>
> \tolerant\protected\def\startsolution[#1]%
> {\startmysolution
> \it}
>
> \protected\def\stopsolution
> {\stopmysolution}
>
> \stopmode
>
> \startnotmode[solution] % If in solution mode, redefine
> \startsolution...\stopsolution
>
> \tolerant\protected\def\startsolution[#1]%
> {\doifelsenothing{#1}{\blank[2.5cm]}{\blank[#1]}
> \gobbleuntil\stopsolution}
>
> \protected\def\stopsolution
> {}
>
> \stopnotmode
>
> \starttext
>
> How many roads? (The 1-inch space below appears whether or not it contains a
> solution.)
>
> \startsolution
> 42 roads.
> \stopsolution
>
> How much wood? (I would like to define solution so this to behaves like the
> previous question.)
>
> \startsolution[1in]
> Alotta wood!
> \stopsolution
>
> No more questions.
> \stoptext
>
> much nicer is to use the blocks mechanism (but i need to check if we can do
> the 2in there)
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
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