ftp.nice.ch/pub/next/tools/screen/ScreenSaver.NIHS.bs.tar.gz#/ScreenSaver/Source/ScreenSaver.m

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#import "ScreenSaver.h"

@implementation ScreenSaver

void runOneStep (DPSTimedEntry timedEntry, double timeNow, void *data);

-	startScreenSaver
{
	void	runOneStep();
			
	if( !timerRunning )
	{
		PShidecursor();
		bouncingView = [[[[NXBundle bundleForClass: [self class]]
			classNamed: "BouncingView"] alloc] init];
		[bouncingView startScreenSaver];		
		timer = DPSAddTimedEntry(1.0 / 15.0, &runOneStep, 
			bouncingView, NX_BASETHRESHOLD);
		timerRunning = YES;
	}
	
	return self;
}

-	stopScreenSaver
{
	if( timerRunning )
	{
		PSshowcursor();
		DPSRemoveTimedEntry (timer);
		timerRunning = NO;
		[bouncingView stopScreenSaver];
		[bouncingView free];
	}
		
	return self;
}

void runOneStep (DPSTimedEntry timedEntry, double timeNow, void *data)
{
    [(id)data step];
}


@end

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