GNU bug report logs - #52129
29.0.50; Wish: Extend `:align-to center' to work on lines in buffer

Previous Next

Full log

Message #26 received at 52129 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Arthur Miller <arthur.miller <at> live.com>
Cc: 52129 <at> debbugs.gnu.org
Subject: Re: bug#52129: 29.0.50; Wish: Extend `:align-to center' to work on
 lines in buffer
Date: Sun, 28 Nov 2021 09:48:48 +0200

> From: Arthur Miller <arthur.miller <at> live.com>
> Cc: 52129 <at> debbugs.gnu.org
> Date: Sun, 28 Nov 2021 00:40:30 +0100
> 
> > That's because it centers the first character of the string, not its
> > middle character.
> 
> That too; so you see, it is not as simple to get it right by just prepending a
> space with :align-to center property.

We've been through this: you need to dynamically compute the pixel
coordinate to align-to, as function of the string width.

> >> Is there any way to make it aware of surrounding context, like entire line? Or
> >> would that be too demanding computationally?
> >
> > I don't think I understand what you mean by "surrounding context", and
> > what would it mean for it to "be aware" of it?
> 
> With context I meant simply the line, or at least part of the line to be
> displayed. To be aware of it = to take it into consideration when displaying
> line, so things like suggested would be possible.

The display engine considers the line as a whole only when the entire
screen line has been laid out, i.e. we get to a newline or the X
coordinate is at the right edge of the window.  Before that, there's
no information about the "line context".

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.