I was working on a program like Pixen, but just to find the mouse’s X and Y. I wrote this code to detect mouse motion:

#import <Cocoa/Cocoa.h>

@interface MouseMovement : NSObject { NSPoint oldPos; NSThread *sensorThread; SEL targetCallSelector; id target; }

• (id)initWithTarget: (id)tgtObj selector: (SEL)tgtSel;
• (id)target;
• (void)setTarget: (id)newTgt;
• (void)beginScanning;
• (void)stopScanning; @end

@interface MouseMovement()

• (void)mouseSensing: (id)param; @end

@implementation MouseMovement

• (id)init { [self initWithTarget: nil selector: NSSelectorFromString(@””)]; return self; }

• (id)initWithTarget: (id)tgtObj selector: (SEL)tgtSel { [super init]; target = tgtObj; targetCallSelector = tgtSel; sensorThread = [[NSThread alloc] initWithTarget: self selector: @selector(mouseSensing:) object: nil]; return self; }

• (void)dealloc { [sensorThread cancel]; [sensorThread release]; [super dealloc]; }

#pragma mark System Methods

• (id)target { return target; }

• (void)setTarget: (id)newTgt { target = newTgt; }

• (void)beginScanning { [sensorThread start]; }

• (void)stopScanning; { [sensorThread cancel]; [sensorThread release]; sensorThread = [[NSThread alloc] initWithTarget: self selector: @selector(mouseSensing:) object: nil]; }

• (void)mouseSensing: (id)param { NSAutoreleasePool *threadPool = [[NSAutoreleasePool alloc] init]; oldPos = [NSEvent mouseLocation]; while(![sensorThread isCancelled]) { NSPoint mousePos = [NSEvent mouseLocation]; if((mousePos.x != oldPos.x) || (mousePos.y != oldPos.y)) { // If mouse moved // Post selector [target performSelector: targetCallSelector]; // Finalize oldPos = mousePos; } [threadPool drain]; // Drain autorelease pool } [threadPool release]; }

@end