/* Copyright (c) 2006 Brandon Aaron (brandon.aaron@gmail.com || http://brandonaaron.net)
* Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
* and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
* 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.
*
* $LastChangedDate: 2007-06-20 16:25:35 -0500 (Wed, 20 Jun 2007) $
* $Rev: 2125 $
*
* Version: 2.2
*/
(function($) {
    $.fn.extend({ mousewheel: function(f) {
        if (!f.guid) f.guid = $.event.guid++; if (!$.event._mwCache) $.event._mwCache = []; return this.each(function() {
            if (this._mwHandlers) return this._mwHandlers.push(f); else this._mwHandlers = []; this._mwHandlers.push(f); var s = this; this._mwHandler = function(e) { e = $.event.fix(e || window.event); $.extend(e, this._mwCursorPos || {}); var delta = 0, returnValue = true; if (e.wheelDelta) delta = e.wheelDelta / 120; if (e.detail) delta = -e.detail / 3; if (window.opera) delta = -e.wheelDelta; for (var i = 0; i < s._mwHandlers.length; i++) if (s._mwHandlers[i]) if (s._mwHandlers[i].call(s, e, delta) === false) { returnValue = false; e.preventDefault(); e.stopPropagation(); } return returnValue; }; if ($.browser.mozilla && !this._mwFixCursorPos) { this._mwFixCursorPos = function(e) { this._mwCursorPos = { pageX: e.pageX, pageY: e.pageY, clientX: e.clientX, clientY: e.clientY }; }; $(this).bind('mousemove', this._mwFixCursorPos); } if (this.addEventListener) if ($.browser.mozilla) this.addEventListener('DOMMouseScroll', this._mwHandler, false); else this.addEventListener('mousewheel', this._mwHandler, false); else
                this.onmousewheel = this._mwHandler; $.event._mwCache.push($(this));
        });
    }, unmousewheel: function(f) {
        return this.each(function() {
            if (f && this._mwHandlers) { for (var i = 0; i < this._mwHandlers.length; i++) if (this._mwHandlers[i] && this._mwHandlers[i].guid == f.guid) delete this._mwHandlers[i]; } else {
                if ($.browser.mozilla && !this._mwFixCursorPos) $(this).unbind('mousemove', this._mwFixCursorPos); if (this.addEventListener) if ($.browser.mozilla) this.removeEventListener('DOMMouseScroll', this._mwHandler, false); else this.removeEventListener('mousewheel', this._mwHandler, false); else
                    this.onmousewheel = null; this._mwHandlers = this._mwHandler = this._mwFixCursorPos = this._mwCursorPos = null;
            } 
        });
    } 
    }); $(window).one('unload', function() { var els = $.event._mwCache || []; for (var i = 0; i < els.length; i++) els[i].unmousewheel(); });
})(jQuery);