Is a `max-width' spec feasible?

Is a `max-width' spec feasible?

[Lars Ingebrigtsen]

I haven't looked at this at all, so I'm just throwing this out there so
I don't forget (before going out):  Would a `max-width' display spec be
feasible?

That is, it's like `min-width', but if we've reached an it->current_x
that's wider than the spec, then we throw out all glyphs we've already
prepared, back to the desired width?

This would make a variable pitch table trivial to implement -- you'd
just insert a bunch of strings with both min-width and max-width, and
the display engine would do all the stretching/chopping for you.

If the strings were very long, this would be massively inefficient, of
course, but let's assume that we're not doing that.

Or...  we could just skip rendering the glyphs if we're going to surpass
the desired current_x?  Yes, that sounds more efficient?

OK, gotta run.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Re: Is a `max-width' spec feasible?

[Stefan Monnier]

> I haven't looked at this at all, so I'm just throwing this out there so
> I don't forget (before going out):  Would a `max-width' display spec be
> feasible?

I'm not the right person to answer.  But I'd welcome this
functionality, indeed.

> That is, it's like `min-width', but if we've reached an it->current_x
> that's wider than the spec, then we throw out all glyphs we've already
> prepared, back to the desired width?

Side note: `truncate-string-to-width` doesn't just throw away the
excess but also inserts an ellipsis to announce the truncation, so if we
add such a `max-width` it'd be desirable to make it display an ellipsis
as well when truncating text.


        Stefan

Re: Is a `max-width' spec feasible?

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> Side note: `truncate-string-to-width` doesn't just throw away the
> excess but also inserts an ellipsis to announce the truncation, so if we
> add such a `max-width` it'd be desirable to make it display an ellipsis
> as well when truncating text.

Yup.  That does complicate the thing quite a bit, because we'd want to
allow customising that, and the width of the ellipsis is very different
on different displays, etc.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no