[NTG-context] Interactive table of content -- jumps always 1 page too far

Pablo Rodriguez oinos at gmx.es
Sat Jan 31 15:50:27 CET 2015

On 01/31/2015 01:36 PM, Hans Hagen wrote:
> On 1/31/2015 1:12 PM, Pablo Rodriguez wrote:
>> [...]
>> It doesn’t show what you meant, the link destination is not on the
>> heading itself, but on the next paragraph.
> \enabletrackers[*references*]
> \enabletrackers[*destinations*]

Hi Hans,

many thanks for your reply.

I’m afraid there might be something wrong with this. I have been using
poppler-glib-demo to check it (and this is the first time I use it, so I
might be wrong as well).

The minimal sample:

    \setupinteraction[state=start, focus=standard]

Link destination for “Chapter” seems to be:

    << /D [27 0 R /XYZ 70.867 689.409 null]>>

But both chapter headings are placed at x,y (70.87, 122.22), according
to poppler-glib-demo.

Anyway, there is a proof that something might be rotten, because the
link itself has a higher box (an it is lower in the page):

    << /Subtype /Link /Dest (#2) /F 4
        /Rect [70.867 652.344 496.06 666.772] /Border [0 0 0]>>

I cannot give a more accurate description (the PDF spec is all Greek to
me), but I think there is something wrong with link destinations (they
seem to be lower than they should be).

BTW, does the sample above work right with Adobe? (I’m don’t have it
installed.) It doesn’t work with either evince-3.10.3 or mupdf-1.6.

>> I think this should be improved. And I guess it goes unnoticed, because
>> after clicking on a link, the browser fits view to page.
> this is also a bit browser dependent i think

I guess this is caused by the link destination syntax (section
of the PDF specification).

Withouth specifying "focus=standard" in the sample above, the link is:

    << /Subtype /Link /Dest [13 0 R /Fit] /F 4
        /Rect [70.867 652.344 496.06 666.772] /Border [0 0 0]>>

/Fit specifies that the page should be so that its entire width and
height are magnified enough so that they fit in the window.

Having said that, I cannot see why it makes sense that ConTeXt generates
documents with this default.

I mean, the default paper size is A4, if the default behavior after
cliciking on a link is to fit page height (or width in landscape), one
needs a huge screen not to render the text unreadable.

Sorry, but I cannot see the gain in this default. Would it be possible
that the default would be the behaviour set by "focus=standard"?

Could you consider both suggestions?

Many thanks for your help,


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