http://bayalagbuteegch.mn/js/jquery.mousewheel.js

1/*! Copyright (c) 2013 Brandon Aaron (http://brandonaaron.net)
2 * Licensed under the MIT License (LICENSE.txt).
3 *
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
7 *
8 * Version: 3.1.3
9 *
10 * Requires: 1.2.2+
11 */
12
13
14(function (factory) {
15    if ( typeof define === 'function' && define.amd ) {
16        // AMD. Register as an anonymous module.
17        define(['jquery'], factory);
18    } else if (typeof exports === 'object') {
19        // Node/CommonJS style for Browserify
20        module.exports = factory;
21    } else {
22        // Browser globals
23        factory(jQuery);
24    }
25}(function ($) {
26
27    var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'];
28    var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
29    var lowestDelta, lowestDeltaXY;
30
31    if ( $.event.fixHooks ) {
32        for ( var i = toFix.length; i; ) {
33            $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
34        }
35    }
36
37    $.event.special.mousewheel = {
38        setup: function() {
39            if ( this.addEventListener ) {
40                for ( var i = toBind.length; i; ) {
41                    this.addEventListener( toBind[--i], handler, false );
42                }
43            } else {
44                this.onmousewheel = handler;
45            }
46        },
47
48        teardown: function() {
49            if ( this.removeEventListener ) {
50                for ( var i = toBind.length; i; ) {
51                    this.removeEventListener( toBind[--i], handler, false );
52                }
53            } else {
54                this.onmousewheel = null;
55            }
56        }
57    };
58
59    $.fn.extend({
60        mousewheel: function(fn) {
61            return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
62        },
63
64        unmousewheel: function(fn) {
65            return this.unbind("mousewheel", fn);
66        }
67    });
68
69
70    function handler(event) {
71        var orgEvent = event || window.event,
72            args = [].slice.call(arguments, 1),
73            delta = 0,
74            deltaX = 0,
75            deltaY = 0,
76            absDelta = 0,
77            absDeltaXY = 0,
78            fn;
79        event = $.event.fix(orgEvent);
80        event.type = "mousewheel";
81
82        // Old school scrollwheel delta
83        if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta; }
84        if ( orgEvent.detail )     { delta = orgEvent.detail * -1; }
85
86        // New school wheel delta (wheel event)
87        if ( orgEvent.deltaY ) {
88            deltaY = orgEvent.deltaY * -1;
89            delta  = deltaY;
90        }
91        if ( orgEvent.deltaX ) {
92            deltaX = orgEvent.deltaX;
93            delta  = deltaX * -1;
94        }
95
96        // Webkit
97        if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY; }
98        if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }
99
100        // Look for lowest delta to normalize the delta values
101        absDelta = Math.abs(delta);
102        if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
103        absDeltaXY = Math.max(Math.abs(deltaY), Math.abs(deltaX));
104        if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
105
106        // Get a whole value for the deltas
107        fn = delta > 0 ? 'floor' : 'ceil';
108        delta  = Math[fn](delta / lowestDelta);
109        deltaX = Math[fn](deltaX / lowestDeltaXY);
110        deltaY = Math[fn](deltaY / lowestDeltaXY);
111
112        // Add event and delta to the front of the arguments
113        args.unshift(event, delta, deltaX, deltaY);
114
115        return ($.event.dispatch || $.event.handle).apply(this, args);
116    }
117
118}));