/*! Copyright (c) 2010 Brandon Aaron (http://brandonaaron.net)
 * Licensed under the MIT License (LICENSE.txt).
 *
 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
 * Thanks to: Seamus Leahy for adding deltaX and deltaY
 *
 * Version: 3.0.4
 * 
 * Requires: 1.2.2+
 */

(function($) {

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

$.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 ( event.wheelDelta ) { delta = event.wheelDelta/120; }
if ( event.detail ) { delta = -event.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.handle.apply(this, args);
}

})(jQuery);