1 /*! Copyright (c) 2013 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
14 if (typeof define === 'function' && define.amd) {
15 // AMD. Register as an anonymous module.
16 define(['jquery'], factory);
23 var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll'];
24 var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
25 var lowestDelta, lowestDeltaXY;
27 if ($.event.fixHooks) {
28 for ( var i=toFix.length; i; ) {
29 $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
33 $.event.special.mousewheel = {
35 if ( this.addEventListener ) {
36 for ( var i=toBind.length; i; ) {
37 this.addEventListener( toBind[--i], handler, false );
40 this.onmousewheel = handler;
44 teardown: function() {
45 if ( this.removeEventListener ) {
46 for ( var i=toBind.length; i; ) {
47 this.removeEventListener( toBind[--i], handler, false );
50 this.onmousewheel = null;
56 mousewheel: function(fn) {
57 return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
60 unmousewheel: function(fn) {
61 return this.unbind("mousewheel", fn);
66 function handler(event) {
67 var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, deltaX = 0, deltaY = 0, absDelta = 0, absDeltaXY = 0;
68 event = $.event.fix(orgEvent);
69 event.type = "mousewheel";
71 // Old school scrollwheel delta
72 if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta; }
73 if ( orgEvent.detail ) { delta = orgEvent.detail * -1; }
75 // New school wheel delta (wheel event)
76 if ( orgEvent.deltaY ) {
77 deltaY = orgEvent.deltaY * -1;
80 if ( orgEvent.deltaX ) {
81 deltaX = orgEvent.deltaX;
86 if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY; }
87 if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }
89 absDelta = Math.abs(delta);
90 if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
92 absDeltaXY = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
93 if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
95 // Add event and delta to the front of the arguments
96 args.unshift(event, Math.floor(delta/lowestDelta), Math.floor(deltaX/lowestDeltaXY), Math.floor(deltaY/lowestDeltaXY));
98 return ($.event.dispatch || $.event.handle).apply(this, args);