Re: [PATCH] Implement functions for measuring fonts and max chars per line

["Perry E. Metzger" <perry@piermont.com>]

On Sun, 18 Jan 2015 05:42:49 +0200 Eli Zaretskii <eliz@gnu.org> wrote:
> > > > This all brings to mind: is there a good way now to determine
> > > > what the maximum number of lines in a frame would be in a
> > > > given font on the user's display?
> > > 
> > > You mean window, not frame, right?
> > 
> > No, frame.
> 
> It's meaningless to ask this question about frames, since frames
> don't display text, at least not in GUI sessions.

There is a variables named default-frame-alist where I can do
things like setting 'height to an integer like "55" which
seems to indicate a frame where 55 lines of text may be viewed.
Perhaps my terminology is screwed up because of "default-frame-alist"
and the like, but my goal is to calculate what "55" should be rather
than setting it through trial and error. Regardless, my .emacs
currently includes

(if window-system
    (add-to-list 'default-frame-alist
		 (cons 'height 60)))

and I'd like to compute which "height" is full height for my display
(again, rather than simply figuring a number out by trial and error).

> > I'd like to be able to set my default frame height to "full
> > height" for the display (filling the display from top to bottom)
> > -- right now I do guesswork to do this, and my .emacs breaks when
> > I switch to a new display.
>
> Then you need to maximize the frame vertically.

I'm unclear on how to do that programatically either.

> > > See window-screen-lines, which I think does what you want.
> > 
> > I believe that says how many lines are in an emacs window, not in
> > the frame if it contains a single window
> 
> When the frame has a single window, this says exactly what the frame
> can display.

Yes, but I want to set the height of the frame, not query what it
is. I know what it is since I set it -- but I want to set it to the
largest integer it can be given the display and the font I am using.

Am I being unclear?

Perry
-- 
Perry E. Metzger		perry@piermont.com