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
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