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From: van@HELIOS.EE.LBL.GOV (Van Jacobson)
Newsgroups: comp.archives
Subject: [xpert] Re: Cascading SimpleMenuWidgets
Message-ID: <1990May30.152217.7628@math.lsa.umich.edu>
Date: 30 May 90 15:22:17 GMT
Sender: emv@math.lsa.umich.edu (Edward Vielmetti)
Reply-To: van@HELIOS.EE.LBL.GOV (Van Jacobson)
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Archive-name: smemenu/30-May-90
Original-posting-by: van@HELIOS.EE.LBL.GOV (Van Jacobson)
Original-subject: Re: Cascading SimpleMenuWidgets
Archive-site: ftp.ee.lbl.gov [128.3.254.68]
Reposted-by: emv@math.lsa.umich.edu (Edward Vielmetti)

I did a simple menu entry object that allows you to cascade
SimpleMenuWidgets.  It's call is essentially identical to SmeBSB
but requires one more argument, XtNmenu, that's the name of the
menu to be popped up when this entry is highlighted.  The code
is available for anonymous ftp from ftp.ee.lbl.gov
(128.3.254.68), file SmeMenu.tar.Z.  Attached is a copy of the
README from the tarchive.

 - Van

-----------------

README for Simple Menu Entry `Menu' object, SMEMenu.
Wed May 30 02:04:17 PDT 1990

This tar contains a new `simple menu' object for the Athena widget
set that allows hierarchical menus to be built.  There are four files:

	SmeMenu.c	the `menu' simple menu entry object

	SmeMenu.h	user visible definitions for above

	SmeMenuP.h	private definitions for above

	SimpleMenu.c	slightly modified simple menu widget.  main
			change was to make XawPositionSimpleMenu action
			externally visible (so user written programs
			could position menus) and re-implement it (without
			changing semantics) so its lower level routines
			could be used by SmeMenu to position a popped-up
			menu correctly.

Use
---
SmeMenu is almost identical to SmeBSB and takes all the same label,
bitmap, etc., arguments.  There are two args added:

	XtNmenu		is the name of the menu to be popped up when
			this menu entry is selected.  This must be the
			name of a SimpleMenu widget.  This argument must
			be supplied.

	XtNpopupSelection  is a boolean that, if true, causes the popped
			up menu to be positioned at the last selected
			entry.  If false (the default), the popped up
			menu is positioned at its label.

Bugs
----
Probably.  But there's only one that I know of:  The toolkit
event logic doesn't seem to handle modal cascades very well and
you will occasionally get the message

	"Warning: XtRemoveGrab asked to remove a widget not on the list"

in well defined circumstances that I won't attempt to describe
here.  This appears to me to be a toolkit bug but, rather than
embark on a major recoding effort to fix it, I just commented
the above warning out in Xt/Event.c:RemoteGrab.

 - Van Jacobson, van@helios.ee.lbl.gov
   Lawrence Berkeley Laboratory