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: 3.1.3
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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 if (typeof exports === 'object') {
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18 | // Node/CommonJS style for Browserify
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19 | module.exports = factory;
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20 | } else {
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21 | // Browser globals
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22 | factory(jQuery);
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23 | }
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24 | }(function ($) {
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25 |
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26 | var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'];
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27 | var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
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28 | var lowestDelta, lowestDeltaXY;
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29 |
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30 | if ( $.event.fixHooks ) {
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31 | for ( var i = toFix.length; i; ) {
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32 | $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
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33 | }
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34 | }
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35 |
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36 | $.event.special.mousewheel = {
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37 | setup: function() {
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38 | if ( this.addEventListener ) {
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39 | for ( var i = toBind.length; i; ) {
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40 | this.addEventListener( toBind[--i], handler, false );
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41 | }
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42 | } else {
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43 | this.onmousewheel = handler;
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44 | }
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45 | },
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46 |
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47 | teardown: function() {
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48 | if ( this.removeEventListener ) {
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49 | for ( var i = toBind.length; i; ) {
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50 | this.removeEventListener( toBind[--i], handler, false );
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51 | }
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52 | } else {
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53 | this.onmousewheel = null;
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54 | }
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55 | }
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56 | };
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57 |
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58 | $.fn.extend({
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59 | mousewheel: function(fn) {
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60 | return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
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61 | },
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62 |
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63 | unmousewheel: function(fn) {
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64 | return this.unbind("mousewheel", fn);
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65 | }
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66 | });
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67 |
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68 |
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69 | function handler(event) {
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70 | var orgEvent = event || window.event,
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71 | args = [].slice.call(arguments, 1),
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72 | delta = 0,
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73 | deltaX = 0,
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74 | deltaY = 0,
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75 | absDelta = 0,
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76 | absDeltaXY = 0,
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77 | fn;
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78 | event = $.event.fix(orgEvent);
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79 | event.type = "mousewheel";
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80 |
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81 | // Old school scrollwheel delta
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82 | if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta; }
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83 | if ( orgEvent.detail ) { delta = orgEvent.detail * -1; }
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84 |
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85 | // New school wheel delta (wheel event)
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86 | if ( orgEvent.deltaY ) {
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87 | deltaY = orgEvent.deltaY * -1;
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88 | delta = deltaY;
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89 | }
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90 | if ( orgEvent.deltaX ) {
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91 | deltaX = orgEvent.deltaX;
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92 | delta = deltaX * -1;
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93 | }
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94 |
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95 | // Webkit
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96 | if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY; }
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97 | if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }
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98 |
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99 | // Look for lowest delta to normalize the delta values
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100 | absDelta = Math.abs(delta);
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101 | if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
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102 | absDeltaXY = Math.max(Math.abs(deltaY), Math.abs(deltaX));
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103 | if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
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104 |
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105 | // Get a whole value for the deltas
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106 | fn = delta > 0 ? 'floor' : 'ceil';
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107 | delta = Math[fn](delta / lowestDelta);
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108 | deltaX = Math[fn](deltaX / lowestDeltaXY);
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109 | deltaY = Math[fn](deltaY / lowestDeltaXY);
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110 |
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111 | // Add event and delta to the front of the arguments
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112 | args.unshift(event, delta, deltaX, deltaY);
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113 |
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114 | return ($.event.dispatch || $.event.handle).apply(this, args);
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115 | }
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116 |
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117 | }));
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