ftp.nice.ch/pub/next/developer/objc/appkit/Ergo.1.0.N.bs.tar.gz#/Ergo/Multi-Board_Version/EmptySquare.m

This is EmptySquare.m in view mode; [Download] [Up]

#import "EmptySquare.h"

@implementation EmptySquare

- mouseEntered: (NXEvent *) theEvent {
    [[self window] makeSquaresPerform: @selector(checkAdjacencyWith:)
				 with: self];
    return self;
}	/* above, don't do return [...]; someone may depend on return self */

/* Private methods: */

- foundAdjacent {	/* we were found to be adjacent by the above */
    return [self setIsHighlighted: YES];
}

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.