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Path: utzoo!utgpu!watserv1!watmath!att!tut.cis.ohio-state.edu!ucbvax!ucsfcgl!dufy.mmwb.ucsf.edu!kneller
From: kneller@dufy.mmwb.ucsf.edu (Don Kneller)
Newsgroups: comp.windows.news,comp.windows.x
Subject: scrolling lists in XView - a file dialog
Keywords: scrolling list, XView, X
Message-ID: <14447@cgl.ucsf.EDU>
Date: 27 Jun 90 01:21:20 GMT
Sender: daemon@cgl.ucsf.edu
Distribution: na
Lines: 47

Here seems like an easy project:

	Create a file open dialog that shows the contents of the current
	directory and allows selection of a file or directory. If a
	directory is chosen, show the contents of that directory. If a
	file is chosen, make it the selected file.


I'm trying to use the XView Scrolling List (aka PANEL_LIST panel item)
as documented in section 7.9 of the XView programming manual.

I'm having the following problems with setting the elements in the list:

	1) using xv_set, it is possible to either set a fixed number of
	   strings for the list, or set an indexed string for the list.
	   What I need is a variable number of strings. Something like
	   **argv would have done the trick.

	   To get a variable number of strings, it is necessary to insert
	   one entry for each string. This is painfully slow and causes
	   unnecessary flashing on the screen. Moreover, it is not possible
	   to start with an empty list of entries --- there must be at least
	   one or PANEL_LIST_INSERT dumps core.

		xv_set(thing, PANEL_LIST_STRINGS, "", (char *) NULL, 0);
		xv_set(thing, PANEL_LIST_INSERT, i
			      PANEL_LIST_STRING, i, newvalue,
			      0);


	2) to change the entries, it is not possible to change all of them
	   at once. I would have hoped something like:

		xv_set(thing, PANEL_LIST_STRINGS, (char *) NULL, 0);

	   would have done the trick. Instead it is necessary to delete
	   them one at a time:

		xv_set(thing, PANEL_DELETE_STRING, i, 0);

	   Again, painfully slow and causes unnecessary screen updates.


Surely (you don't mind if I call you "Shirley?") this has been done before.
Any help would be appreciated.

- don