Re: TTY Vertical divider face?

[Kim F. Storm]

Juri Linkov <address@hidden> writes:

>>>     It makes sense to use the new `vertical-border' face not only
>>>     for defining a vertical divider on character terminals, but also
>>>     on X for defining the foreground color of the vertical thin line
>>>     between windows.
>>>
>>> That seems natural.
>>>
>>> Is that line present even when there is a scroll bar?
>>
>> Yes.
>
> I want also to fix the problem where the vertical border steals
> 1 pixel from the text area of the right window.  This makes some
> letters indistinguishable.  The patch below draws the vertical border
> 1 pixel left when there are no scroll bars and no left fringes.
> These screenshots demonstrate how the vertical border looks
> before and after applying the patch:


I think we need to address this problem, and your change may work --
but what happens if the window on the left has a scroll bar on the
right?

I have been considering the following approach:

- if there are no scroll-bars, your approach is good.

- if window has a scroll-bar on the left, reduce width of
  scroll-bar by one pixel, and put line on the left side of
  the scroll-bar.

- if window has scroll-bar on the right, and the window
  on the left of this window also has scroll-bar on right,
  reduce width of other window's scroll-bar and put line
  on right side of that scroll-bar.

- if window has scroll-bar on right, and window on
  the left has scroll-bar on left, don't show the
  vertical line (the dual scroll-bars next to each other
  is enough to show which window the scroll-bars belong to).


Actually, in most cases, the scroll-bars are already a little
narrower than a full multiple of the column width, so there may
already be room for the vertical line without reducing the
scroll-bar width.


So although your change may give good results in most cases,
I think there are cases where it may fail (if you happen to
move the vertical line into an area occupied by a scroll bar...



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> Index: src/xdisp.c
> ===================================================================
> RCS file: /cvsroot/emacs/emacs/src/xdisp.c,v
> retrieving revision 1.1028
> diff -c -r1.1028 xdisp.c
> *** src/xdisp.c       25 Jun 2005 22:35:42 -0000      1.1028
> --- src/xdisp.c       27 Jun 2005 23:11:18 -0000
> ***************
> *** 22400,22405 ****
> --- 22400,22408 ----
>         window_box_edges (w, -1, &x0, &y0, &x1, &y1);
>         y1 -= 1;
>   
> +       if (WINDOW_LEFT_FRINGE_WIDTH (w) == 0)
> +     x1 -= 1;
> + 
>         rif->draw_vertical_window_border (w, x1, y0, y1);
>       }
>     else if (!WINDOW_LEFTMOST_P (w)
> ***************
> *** 22410,22415 ****
> --- 22413,22421 ----
>         window_box_edges (w, -1, &x0, &y0, &x1, &y1);
>         y1 -= 1;
>   
> +       if (WINDOW_LEFT_FRINGE_WIDTH (w) == 0)
> +     x0 -= 1;
> + 
>         rif->draw_vertical_window_border (w, x0, y0, y1);
>       }
>   }
>
> -- 
> Juri Linkov
> http://www.jurta.org/emacs/

-- 
Kim F. Storm <address@hidden> http://www.cua.dk