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1 /*! Copyright (c) 2013 Brandon Aaron (http://brandonaaron.net)
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2 * Licensed under the MIT License (LICENSE.txt).
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3 *
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4 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
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5 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
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6 * Thanks to: Seamus Leahy for adding deltaX and deltaY
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7 *
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8 * Version: 3.1.0
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9 *
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10 * Requires: 1.2.2+
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11 */
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12
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13 (function (factory) {
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14 if (typeof define === 'function' && define.amd) {
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15 // AMD. Register as an anonymous module.
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16 define(['jquery'], factory);
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17 } else {
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18 // Browser globals
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19 factory(jQuery);
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20 }
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21 }(function ($) {
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22
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23 var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll'];
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24 var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
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25 var lowestDelta, lowestDeltaXY;
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26
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27 if ($.event.fixHooks) {
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28 for ( var i=toFix.length; i; ) {
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29 $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
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30 }
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31 }
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32
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33 $.event.special.mousewheel = {
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34 setup: function() {
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35 if ( this.addEventListener ) {
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36 for ( var i=toBind.length; i; ) {
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37 this.addEventListener( toBind[--i], handler, false );
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38 }
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39 } else {
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40 this.onmousewheel = handler;
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41 }
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42 },
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43
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44 teardown: function() {
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45 if ( this.removeEventListener ) {
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46 for ( var i=toBind.length; i; ) {
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47 this.removeEventListener( toBind[--i], handler, false );
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48 }
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49 } else {
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50 this.onmousewheel = null;
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51 }
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52 }
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53 };
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54
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55 $.fn.extend({
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56 mousewheel: function(fn) {
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57 return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
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58 },
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59
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60 unmousewheel: function(fn) {
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61 return this.unbind("mousewheel", fn);
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62 }
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63 });
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64
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65
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66 function handler(event) {
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67 var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, deltaX = 0, deltaY = 0, absDelta = 0, absDeltaXY = 0;
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68 event = $.event.fix(orgEvent);
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69 event.type = "mousewheel";
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70
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71 // Old school scrollwheel delta
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72 if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta; }
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73 if ( orgEvent.detail ) { delta = orgEvent.detail * -1; }
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74
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75 // New school wheel delta (wheel event)
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76 if ( orgEvent.deltaY ) {
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77 deltaY = orgEvent.deltaY * -1;
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78 delta = deltaY;
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79 }
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80 if ( orgEvent.deltaX ) {
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81 deltaX = orgEvent.deltaX;
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82 delta = deltaX * -1;
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83 }
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84
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85 // Webkit
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86 if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY; }
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87 if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }
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88
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89 absDelta = Math.abs(delta);
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90 if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
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91
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92 absDeltaXY = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
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93 if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
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94
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95 // Add event and delta to the front of the arguments
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96 args.unshift(event, Math.floor(delta/lowestDelta), Math.floor(deltaX/lowestDeltaXY), Math.floor(deltaY/lowestDeltaXY));
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97
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98 return ($.event.dispatch || $.event.handle).apply(this, args);
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99 }
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100
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101 }));
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