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

From: Perry E. Metzger
Subject: Re: [PATCH] Implement functions for measuring fonts and max chars per line
Date: Sun, 18 Jan 2015 21:56:43 -0500

On Sun, 18 Jan 2015 16:38:01 -0800 (PST) Drew Adams
<address@hidden> wrote:
> > What I want is to know (by calculation) what the maximum height,
> > in lines, happens to be so I can shove that in for 'height in
> > default-frame-alist. (There are other uses for such information of
> > course, see above.)
> The max height in pixels is `x-display-pixel-height'.
> Divide that by the value returned by `frame-char-height' for your
> frame, or by whatever character height you intend to use, if
> you know it, to find the number of lines possible for the display.
> But that does not count the space needed for these things:
> 1. menu-bar - you can approximate this by 
> `(frame-parameter nil 'menu-bar-lines)'.
> 2. tool-bar - similar: `tool-bar-lines'.
> 3. height of the window-mgr title bar and bottom border.
> 4. any other window-mgr stuff that is outside Emacs's
> visibility & control.
> So proceeding this way you need to do a little estimating,
> especially wrt window-mgr stuff.

I've played these games before, and it is a reasonable stop-gap for
what I'm trying to do, at least much of the time.

What would be nice would be the addition of a function that told one
the true maximum number of lines possible for a frame on the given
display, *or* if there was a non-integer value you could specify for
the "height" component of the frame-alist that simply meant "as much
as possible". (Both might actually be nice things to have.)

Perry E. Metzger                address@hidden

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