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From: janzen@mprgate.mpr.ca (Martin Janzen)
Newsgroups: comp.windows.x.motif
Subject: Re: pointers
Message-ID: <1991Jun18.005310.5109@mprgate.mpr.ca>
Date: 18 Jun 91 00:53:10 GMT
References: <447@nic.cerf.net>
Sender: news@mprgate.mpr.ca
Reply-To: janzen@mprgate.mpr.ca (Martin Janzen)
Organization: MPR Teltech Ltd.
Lines: 39

In article <447@nic.cerf.net>, dolanmic@nic.cerf.net (Michael A. Dolan) writes:
>[...]
>I need to change the pointer image during the execution of a motif app.
>From within a callback, I am calling the standard Xlib stuff to put
>up an hourglass, using the following code:
>
>change_cursor( w )
>widget	w;
>{
>	XDefineCursor( XtDisplay( w ), XtWindow( w ),
>		XcreateFontCursor( XtDisplay( w ), XC_gumby ) );
>}

This looks like a memory leak to me; you'd probably be better off calling
XCreateFontCursor only once and storing the resulting Cursor in a global
variable.

>and I am tearing it down with:
>
>unchange_cursor( w )
>{
>	XUndefineCursor( XtDisplay( w ), XtWindow( w ) );
>}
>
>Nothing appears to happen, however.

You need to let the X server know about your cursor change.  In Motif, all
you have to do is to call XmUpdateDisplay(w) after changing the cursor.

>[...]
>Please reply back at age!syd@ucsd.com if you can help.

My mail bounced, so here it is.

-- 
Martin Janzen                     janzen@mprgate.mpr.ca (134.87.131.13)
MPR Teltech Ltd.                  Phone: (604) 293-5309
8999 Nelson Way                   Fax: (604) 293-6100
Burnaby, BC, CANADA  V5A 4B5