/* 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: 2007-12-20 09:02:08 -0600 (Thu, 20 Dec 2007) $ * $Rev: 4265 $ * * Version: 3.0 *  * Requires: $ 1.2.2+ */  
(function($) {  
$.event.special.mousewheel = { 
setup: function() { 
var handler = $.event.special.mousewheel.handler;  

// Fix pageX, pageY, clientX and clientY for mozilla 
if ( $.browser.mozilla ) 
$(this).bind('mousemove.mousewheel', function(event) { 
$.data(this, 'mwcursorposdata', { 
pageX: event.pageX, 
pageY: event.pageY, 
clientX: event.clientX, 
clientY: event.clientY 
}); 
});  

if ( this.addEventListener ) 
this.addEventListener( ($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false); 
else 
this.onmousewheel = handler; 
},  

teardown: function() { 
var handler = $.event.special.mousewheel.handler;  
$(this).unbind('mousemove.mousewheel');  
if ( this.removeEventListener ) 
this.removeEventListener( ($.browser.mozilla ? 'DOMMouseScroll' : 'mousewheel'), handler, false); 
else 
this.onmousewheel = function(){};  
$.removeData(this, 'mwcursorposdata'); 
},  

handler: function(event) { 
var args = Array.prototype.slice.call( arguments, 1 );  
event = $.event.fix(event || window.event); 
// Get correct pageX, pageY, clientX and clientY for mozilla 
$.extend( event, $.data(this, 'mwcursorposdata') || {} ); 
var delta = 0, returnValue = true;  

if ( event.wheelDelta ) delta = event.wheelDelta/120; 
if ( event.detail ) delta = -event.detail/3; 
// if ( $.browser.opera ) delta = -event.wheelDelta; 
 
event.data = event.data || {}; 
event.type = "mousewheel";  

// Add delta to the front of the arguments 
args.unshift(delta); 
// Add event to the front of the arguments 
args.unshift(event);  

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

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

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

})(jQuery);