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Predicting string lengths in widgets [message #55142]

Mon, 06 August 2007 04:41

mattf
Messages: 13
Registered: January 2007

Junior Member

Hi all...

I have a table widget and I'd like to set the column widths -before-
the table is realized so that the user doesn't have to fiddle with
adjustable widths. Unfortunately, I don't know the lengths of the
strings that I'm going to put into the table before running the
program, and the strings may be rather long. And, for a cross-platform
application, I don't know what the font will be, or, for that matter,
the size of the display.

At the moment, I'm just hacking at the problem by using a pixmap
window and the width parameter in xyouts to get an idea of the string
length in pixels, e.g., if the string is 'test_str' I do

str_max_sz
window, /free, /pixmap, xsize = str_max_sz, ysize = str_max_sz
xyouts, test_str, width = w
wdelete
str_pix_len = ceil(w*str_max_sz)

and then use a fudge factor to get good-looking column widths from
str_pix_len. But there must be a way of doing it, you know,
correctly... no?

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[Message index]

		Predicting string lengths in widgets By: mattf on Mon, 06 August 2007 04:41
		Re: Predicting string lengths in widgets By: mattf on Mon, 06 August 2007 10:08
		Re: Predicting string lengths in widgets By: Michael Galloy on Mon, 06 August 2007 09:40

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