
/*
 * ******************************************************************************
 *  jquery.mb.components
 *  file: jquery.mousewheel.js
 *
 *  Copyright (c) 2001-2014. Matteo Bicocchi (Pupunzi);
 *  Open lab srl, Firenze - Italy
 *  email: matteo@open-lab.com
 *  site: 	http://pupunzi.com
 *  blog:	http://pupunzi.open-lab.com
 * 	http://open-lab.com
 *
 *  Licences: MIT, GPL
 *  http://www.opensource.org/licenses/mit-license.php
 *  http://www.gnu.org/licenses/gpl.html
 *
 *  last modified: 14/05/14 21.17
 *  *****************************************************************************
 */

(function($) {

	var types = ['DOMMouseScroll', 'mousewheel'];

	if ($.event.fixHooks) {
		for ( var i=types.length; i; ) {
			$.event.fixHooks[ types[--i] ] = $.event.mouseHooks;
		}
	}

	$.event.special.mousewheel = {
		setup: function() {
			if ( this.addEventListener ) {
				for ( var i=types.length; i; ) {
					this.addEventListener( types[--i], handler, false );
				}
			} else {
				this.onmousewheel = handler;
			}
		},

		teardown: function() {
			if ( this.removeEventListener ) {
				for ( var i=types.length; i; ) {
					this.removeEventListener( types[--i], handler, false );
				}
			} else {
				this.onmousewheel = null;
			}
		}
	};

	$.fn.extend({
		mousewheel: function(fn) {
			return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
		},

		unmousewheel: function(fn) {
			return this.unbind("mousewheel", fn);
		}
	});


	function handler(event) {
		var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
		event = $.event.fix(orgEvent);
		event.type = "mousewheel";

		// Old school scrollwheel delta
		if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta/120; }
		if ( orgEvent.detail     ) { delta = -orgEvent.detail/3; }

		// New school multidimensional scroll (touchpads) deltas
		deltaY = delta;

		// Gecko
		if ( orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
			deltaY = 0;
			deltaX = -1*delta;
		}

		// Webkit
		if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY/120; }
		if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = -1*orgEvent.wheelDeltaX/120; }

		// Add event and delta to the front of the arguments
		args.unshift(event, delta, deltaX, deltaY);

		return ($.event.dispatch || $.event.handle).apply(this, args);
	}

})(jQuery);
