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From: straw@cam.nist.gov (Mike Strawbridge)
Newsgroups: comp.windows.x
Subject: Re:  XView scrolling list usage
Message-ID: <5873@pizza.cam.nist.gov>
Date: 20 Nov 90 15:12:54 GMT
References: <9011200021.AA02255@zia.aoc.nrao.edu>
Reply-To: straw@pizza.UUCP (Mike Strawbridge)
Organization: National Institute of Standards & Technology, Gaithersburg, MD
Lines: 49

Thanks for your reply to my article. But maybe I was not clear enough on
my first question.

>> I would like to change the all the list's string items by passing to xv_set
>> one attribute/value pair with a value argument such as a pointer to an array
>> of pointers to char.  Can I do this or do I have to know how many items are
>> in the list and pass each string in a separate argument?
>
>The PANEL_LIST_STRINGS attribute does exactly what you want.  Used with
>xv_create or xv_set it takes a NULL terminated list of strings in an array
>of char* and sets each item in the scrolling list to the corresponding
>entry in the array, discarding any previous contents (see pages 155ff in
>the XView programmers manual).

I would like to change the contents of the list with one call to xv_set().
And since my lists will have differing number of items, I was looking for a
way to do this without knowing at compile time how many items are in the
list.

For example, something like
	char *strings[] = { "string1", "string2", "string3", NULL };


	xv_set(panel,
	    PANEL_LIST_STRINGS, strings,
	    NULL);

instead of 
	xv_set(panel,
	    PANEL_LIST_STRINGS, "string1", "string2", "string3", NULL,
	    NULL);

With the first form, changing the strings in a dynamic scrolling list is
much easier. With the second form I have to know at compile time how many
items are in the list. Is something like the first form possible?

Alternatively if the second form is all that is available, I could put an
xv_set(panel, PANEL_LIST_STRING, ...) into a loop and set each string
individually, but I see this as uncool. It takes a little longer and the
display is updated for each xv_set() causing it to blink wildly.

mike

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NAME:   Michael Strawbridge             	TELE: (301) 975-3852
USMAIL: National Institute of Standards 	ARPA: straw@cam.nist.gov
		and Technology            	UUCP: uunet!cme-durer!straw
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