[NTG-context] Re: colors for links

[Hans Hagen via ntg-context <ntg-context@ntg.nl>]

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On 10/12/2023 3:14 PM, Pablo Rodriguez wrote:
> Hi Hans,
> 
> I have the following source, which tries to resemble three kinds of links:
> 
>      \setupinteraction[state=start, style=, focus=standard]
> 
>      \def\inone#1{%
>        \start\setupinteraction[color=darkgreen]%
>        \enabledirectives[references.border=darkgreen]%
>        \goto{#1}[url(#1)]\stop}
>      \def\intwo#1{%
>        \start\setupinteraction[color=darkred]%
>        \enabledirectives[references.border=darkred]%
>        \goto{#1}[url(#1)]\stop}
>      \def\inthree#1{%
>        \start\setupinteraction[color=darkblue]%
>        \enabledirectives[references.border=darkblue]%
>        \goto{#1}[url(#1)]\stop}
> 
>      \starttext
>      \startTEXpage[offset=1dk, align=middle]
>      \inone{one}\blank
>      \intwo{two}\blank
>      \inthree{three}\blank
>      \stopTEXpage
>      \chapter[one]{First chapter}
>      \chapter[two]{Second chapter}
>      \chapter[three]{Second chapter}
>      \stoptext
> 
> I see that the directive for link borders only allows one color for
> links per document.
> 
> In my real-world documents, I need to make three different border links:
> for destinations inside the document (/GoTo), for destinations in other
> documents (/GoToR or /GoToE) and for external destinations (/URI).
> 
> With the current document I write now, I have over a hundred links in
> twenty pages. Being able to visually distinguish each link helps
> interaction with the document (reading or even writing it).
> 
> Would it be possible that \setupinteraction could have a bordercolor
> key, such as the color one?
All is possible but not all should be done, especially not features that 
mostly serve a few viewers (like acrobat) and don't really relate to 
typesetting.

That said, we can add some styling. First of all, you can use a bit of 
abstraction

\defineinteraction[one]  [color=darkgreen,style=\underbar]
\defineinteraction[two]  [color=darkred,  style=\underbar]
\defineinteraction[three][color=darkblue, style=\underbar]

\def\inone#1{%
   \start\setinteraction[one]%
   \goto{#1}[url(#1)]\stop}
\def\intwo#1{%
   \start\setinteraction[two]%
   \goto{#1}[url(#1)]\stop}
\def\inthree#1{%
   \start\setinteraction[three]%
   \goto{#1}[url(#1)]\stop}

which already might help you. To make it easier I'll add \namedgoto do 
that one can say:

\def\inone  #1{\namedgoto[#1]{#1}[url(#1)]}
\def\intwo  #1{\namedgoto[#1]{#1}[url(#1)]}
\def\inthree#1{\namedgoto[#1]{#1}[url(#1)]}

I'll also add \outline and \outlined

\defineinteraction[one]  [color=darkgreen,style=\outlined]%
\defineinteraction[two]  [color=darkred,  style=\outline]%
\defineinteraction[three][color=darkblue, style=\outlined]%

which of course you then will wikify ...

I attached an example but there is no upload (will happen when the build 
is running again because I can't make osx bins here).

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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