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From: aozer@next.com (Ali Ozer)
Newsgroups: comp.sys.next
Subject: Re: Changing Cursor
Message-ID: <118@next.com>
Date: 7 Oct 89 01:43:55 GMT
References: 3883@blake.acs.washington.edu
Reply-To: aozer@NeXT.com (Ali Ozer)
Organization: NeXT, Inc.
Lines: 49

In article <3883@blake.acs.washington.edu> Mark Crispin says:
>I would like to change the cursor in my application to a wait
>cursor when I know the program is going to do something
>time-consuming.
>
>I didn't see any method in Application that seemed to set the
>application's cursor.  The spec sheet for Cursor didn't seem to be
>very helpful; the push and pop methods are interesting, but isn't it a
>bit backwards to be doing this from the cursor instead of the
>application?  [Yes, I know, everything on the NeXT is backwards :-)]
>
>What I want to do is something like:
>
>	[NXApp pushCursor:NXWait];	// save current cursor, put up wait
>	... time-consuming code --
>	[NXApp popCursor];		// restore cursor

Cursor's push and pop methods are the way to go; essentially you need to do:

	#import <appkit/Cursor.h>

	-methodWhichTakesALongTime:sender
	{
	    [NXWait push];
		...
	    [NXWait pop];
	    return self;
	}

To do what you want, you can add the pushCursor: and popCursor methods
to your subclass of Application; it's trivial enough if you use the knowledge
that you can send "pop" to any cursor, not the one you pushed (This is
a feature that will most probably work all the time.):

	- pushCursor:cursor
	{
	    [cursor push];
	    return self;
	}

	- popCursor
	{
	    [NXArrow pop];	// Doesn't matter what cursor, so you can
				// get away with this...
	    return self;
	}	

Ali Ozer, NeXT Developer Support
Ali_Ozer@NeXT.com