1 /*! Copyright (c) 2011 Brandon Aaron (http://brandonaaron.net)
2 * Licensed under the MIT License (LICENSE.txt).
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 * Thanks to: Seamus Leahy for adding deltaX and deltaY
15 var types = ['DOMMouseScroll', 'mousewheel'];
17 if ($.event.fixHooks) {
18 for ( var i=types.length; i; ) {
19 $.event.fixHooks[ types[--i] ] = $.event.mouseHooks;
23 $.event.special.mousewheel = {
25 if ( this.addEventListener ) {
26 for ( var i=types.length; i; ) {
27 this.addEventListener( types[--i], handler, false );
30 this.onmousewheel = handler;
34 teardown: function() {
35 if ( this.removeEventListener ) {
36 for ( var i=types.length; i; ) {
37 this.removeEventListener( types[--i], handler, false );
40 this.onmousewheel = null;
46 mousewheel: function(fn) {
47 return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
50 unmousewheel: function(fn) {
51 return this.unbind("mousewheel", fn);
56 function handler(event) {
57 var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
58 event = $.event.fix(orgEvent);
59 event.type = "mousewheel";
61 // Old school scrollwheel delta
62 if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta/120; }
63 if ( orgEvent.detail ) { delta = -orgEvent.detail/3; }
65 // New school multidimensional scroll (touchpads) deltas
69 if ( orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
75 if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY/120; }
76 if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = -1*orgEvent.wheelDeltaX/120; }
78 // Add event and delta to the front of the arguments
79 args.unshift(event, delta, deltaX, deltaY);
81 return ($.event.dispatch || $.event.handle).apply(this, args);