Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!uc!shamash!caffeine!dtj
From: dtj@caffeine.cray.com (Dean Johnson)
Newsgroups: comp.windows.x
Subject: Re: font size
Message-ID: <7363@caffeine.cray.com>
Date: 13 Jul 90 04:37:22 GMT
References: <8649@ubc-cs.UUCP>
Organization: Cray Research Inc. - Mendota Heights, Minnesota
Lines: 27

#include <std/disclaimers.h>

In article <8649@ubc-cs.UUCP> lindholm@greve.ucs.ubc.ca (George Lindholm) writes:
>How can I calculate the number of lines that will fit in a listWidget?
>I can't find any information on how to get information on the font currently
>being used (XtNfont returns something, what I don't know).

Something like the following function should give you an good approximation.

	-Dean


-------- cut here -----------

#define FONTHEIGHT(a)   ((a)->max_bounds.ascent   + (a)->max_bounds.descent)

lines_in_widget(w)
Widget	w;
{
static Dimension boxHeight;
static XFontStruct *font;
static Arg getargs[] = {{ XtNheight,	(XtArgVal)&boxHeight 	},
			{ XtNfont,	(XtArgVal)&font 	}};

        XtGetValues(w, getargs, XtNumber(getargs));
        return((int) (boxHeight / FONTHEIGHT(font)));
}