Receive global TouchEvents with NSEvent - objective-c

Question

I just try to receive Touch Events globally in the Window and not only in a view.
In my code, you can see below, i will get the absolute position of the touch in the magic trackpad. As long as the cursor is inside the view (the red NSRect) it works fine, but how can i receive touches outside of this view.
I searched for solutions in many communities and the apple devcenter but found nothing.
I think the problem is this: NSSet *touches = [ev touchesMatchingPhase:NSTouchPhaseTouching inView:nil]; Isn't there a method in NSEvent that gets every touch?
Hope anybody can help me.
Here my Implementation:
#implementation MyView
- (id)initWithFrame:(NSRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Initialization code here.
[self setAcceptsTouchEvents:YES];
myColor = [NSColor colorWithDeviceRed:1.0 green:0 blue:0 alpha:0.5];
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect {
// Drawing code here.
NSRect bounds = [self bounds];
[myColor set];
[NSBezierPath fillRect:bounds];
}
- (void)touchesBeganWithEvent:(NSEvent *)ev {
NSSet *touches = [ev touchesMatchingPhase:NSTouchPhaseTouching inView:nil];
for (NSTouch *touch in touches) {
NSPoint fraction = touch.normalizedPosition;
NSSize whole = touch.deviceSize;
NSPoint wholeInches = {whole.width / 72.0, whole.height / 72.0};
NSPoint pos = wholeInches;
pos.x *= fraction.x;
pos.y *= fraction.y;
NSLog(#"%s: Finger is touching %g inches right and %g inches up "
#"from lower left corner of trackpad.", __func__, pos.x, pos.y);
}
}

Answer 1

Calling touchesMatchingPhase:inView: with nil for the last parameter (the way you are doing) will get all touches. The problem is that touchesBeganWithEvent: will simply not fire for a control that isn't in the touch area.
You can make the view the first responder, which will send all events to it first. See becomeFirstResponder and Responder object