1 /*! Copyright (c) 2009 Brandon Aaron (http://brandonaaron.net)

     2  * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)

     3  * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.

     4  * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.

     5  * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.

     6  *

     7  * Version: 3.0.2

     8  * 

     9  * Requires: 1.2.2+

    10  */

    11 

    12 (function($) {

    13 

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

    15 

    16 $.event.special.mousewheel = {

    17 	setup: function() {

    18 		if ( this.addEventListener )

    19 			for ( var i=types.length; i; )

    20 				this.addEventListener( types[--i], handler, false );

    21 		else

    22 			this.onmousewheel = handler;

    23 	},

    24 	

    25 	teardown: function() {

    26 		if ( this.removeEventListener )

    27 			for ( var i=types.length; i; )

    28 				this.removeEventListener( types[--i], handler, false );

    29 		else

    30 			this.onmousewheel = null;

    31 	}

    32 };

    33 

    34 $.fn.extend({

    35 	mousewheel: function(fn) {

    36 		return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");

    37 	},

    38 	

    39 	unmousewheel: function(fn) {

    40 		return this.unbind("mousewheel", fn);

    41 	}

    42 });

    43 

    44 

    45 function handler(event) {

    46 	var args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true;

    47 	

    48 	event = $.event.fix(event || window.event);

    49 	event.type = "mousewheel";

    50 	

    51 	if ( event.wheelDelta ) delta = event.wheelDelta/120;

    52 	if ( event.detail     ) delta = -event.detail/3;

    53 	

    54 	// Add events and delta to the front of the arguments

    55 	args.unshift(event, delta);

    56 

    57 	return $.event.handle.apply(this, args);

    58 }

    59 

    60 })(jQuery);