Le 11 janv. 2022 =C3=A0 17:56, Gavin via ntg-context <ntg-context@ntg.nl> = a =C3=A9crit :

Thanks Hans! This is great. I made a slight = change to add an additional feature. By moving the =E2=80=9Cmysolution=E2=80= =9D definition out of \startmode[solution], I can now use mysolution in = either mode. I=E2=80=99d use this if I want to give my solution to one = of the problems, as an example, on the handout.

-Gavin

I have similar problem = for my courses. The solution I use, different than the = one offered, is = to write in a =C2=AB special =C2=BB color the = text I want to hide from the students. This permits me to have = hidden texts in figures for exemple. Also, I do not calculate space = required, this is automated ! Here is MWE :

\enablemode[solution]

\doifmode{solution}{

= \definecolor[solcolor][magenta]

}

\doifnotmode{s= olution}{

= \definecolor[solcolor][white]

}

\definedescripti= on[solution]

[color=3Dsolcolor]

\starttext

How = many roads? \startcolor[solcolor] Professor = note.\stopcolor

\startsolution

42 = roads.

\stopsolution

How much = wood?

\startsolution

Alotta = wood!

\stopsolution

No= more questions.

\stoptext

So the color used when = solutions are hidden are white on white, we can not see the text; = but of course, if you change the background, you see the hidden = text. So there is another step to the process (I usually do this only = once a term); open the file in Acrobat, and find the option to delete = hidden text. The text for which the color is the same as the background = is really deleted. You can try to select the text in any pdf = view/editor, the text is gone !

Fabrice.

% \enablemode[solution]

% Define "mysolution=E2=80=9D for use independent of solution = mode.
\definenarrower[mysolution]
= [before=3D\blank\it,
  after=3D\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.hagen@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 = =E2=80=9Csolution=E2=80=9D 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=E2=80=99d like, but it doesn=E2=80=99t 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=E2=80=A6\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=3Dmedium,
= spaceafter=3Dmedium,
style=3D\rm\it,
leftmargin=3Dstandard, % Indents block on the left
rightmargin=3Dyes, % Indents block on the right
indentnext=3Dno,
before=3D\vbox = to 1in\bgroup,
after=3D\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=3D\blank,
=      after=3D\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

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=             Ri= dderstraat 27 | 8061 GH Hasselt | The Netherlands
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