Mac OS X Event Monitor

EventMonitor.swift

import Cocoa

public class EventMonitor {
	
	private var monitor: AnyObject?
	private let mask: NSEventMask
	private let handler: NSEvent? -> ()
	
	public init(mask: NSEventMask, handler: NSEvent? -> ()) {
		self.mask = mask
		self.handler = handler
	}
	
	deinit {
		stop()
	}
	
	public func start() {
		monitor = NSEvent.addGlobalMonitorForEventsMatchingMask(mask, handler: handler)
	}
	
	public func stop() {
		if monitor != nil {
			NSEvent.removeMonitor(monitor!)
			monitor = nil
		}
	}
}