https://www.mediawijsheid.nl/wp-content/plugins/easy-fancybox/vend…/jquery.mousewheel.js?x61201&ver=1789031400

1/*!
2 * jQuery Mousewheel 3.1.13
3 *
4 * Copyright jQuery Foundation and other contributors
5 * Released under the MIT license
6 * http://jquery.org/license
7 */
8
9(function (factory) {
10    if ( typeof define === 'function' && define.amd ) {
11        // AMD. Register as an anonymous module.
12        define(['jquery'], factory);
13    } else if (typeof exports === 'object') {
14        // Node/CommonJS style for Browserify
15        module.exports = factory;
16    } else {
17        // Browser globals
18        factory(jQuery);
19    }
20}(function ($) {
21
22    var toFix  = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'],
23        toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
24                    ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
25        slice  = Array.prototype.slice,
26        nullLowestDeltaTimeout, lowestDelta;
27
28    if ( $.event.fixHooks ) {
29        for ( var i = toFix.length; i; ) {
30            $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
31        }
32    }
33
34    var special = $.event.special.mousewheel = {
35        version: '3.1.12',
36
37        setup: function() {
38            if ( this.addEventListener ) {
39                for ( var i = toBind.length; i; ) {
40                    this.addEventListener( toBind[--i], handler, false );
41                }
42            } else {
43                this.onmousewheel = handler;
44            }
45            // Store the line height and page height for this particular element
46            $.data(this, 'mousewheel-line-height', special.getLineHeight(this));
47            $.data(this, 'mousewheel-page-height', special.getPageHeight(this));
48        },
49
50        teardown: function() {
51            if ( this.removeEventListener ) {
52                for ( var i = toBind.length; i; ) {
53                    this.removeEventListener( toBind[--i], handler, false );
54                }
55            } else {
56                this.onmousewheel = null;
57            }
58            // Clean up the data we added to the element
59            $.removeData(this, 'mousewheel-line-height');
60            $.removeData(this, 'mousewheel-page-height');
61        },
62
63        getLineHeight: function(elem) {
64            var $elem = $(elem),
65                $parent = $elem['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
66            if (!$parent.length) {
67                $parent = $('body');
68            }
69            return parseInt($parent.css('fontSize'), 10) || parseInt($elem.css('fontSize'), 10) || 16;
70        },
71
72        getPageHeight: function(elem) {
73            return $(elem).height();
74        },
75
76        settings: {
77            adjustOldDeltas: true, // see shouldAdjustOldDeltas() below
78            normalizeOffset: true  // calls getBoundingClientRect for each event
79        }
80    };
81
82    $.fn.extend({
83        mousewheel: function(fn) {
84            return fn ? this.bind('mousewheel', fn) : this.trigger('mousewheel');
85        },
86
87        unmousewheel: function(fn) {
88            return this.unbind('mousewheel', fn);
89        }
90    });
91
92
93    function handler(event) {
94        var orgEvent   = event || window.event,
95            args       = slice.call(arguments, 1),
96            delta      = 0,
97            deltaX     = 0,
98            deltaY     = 0,
99            absDelta   = 0,
100            offsetX    = 0,
101            offsetY    = 0;
102        event = $.event.fix(orgEvent);
103        event.type = 'mousewheel';
104
105        // Old school scrollwheel delta
106        if ( 'detail'      in orgEvent ) { deltaY = orgEvent.detail * -1;      }
107        if ( 'wheelDelta'  in orgEvent ) { deltaY = orgEvent.wheelDelta;       }
108        if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY;      }
109        if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }
110
111        // Firefox < 17 horizontal scrolling related to DOMMouseScroll event
112        if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
113            deltaX = deltaY * -1;
114            deltaY = 0;
115        }
116
117        // Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
118        delta = deltaY === 0 ? deltaX : deltaY;
119
120        // New school wheel delta (wheel event)
121        if ( 'deltaY' in orgEvent ) {
122            deltaY = orgEvent.deltaY * -1;
123            delta  = deltaY;
124        }
125        if ( 'deltaX' in orgEvent ) {
126            deltaX = orgEvent.deltaX;
127            if ( deltaY === 0 ) { delta  = deltaX * -1; }
128        }
129
130        // No change actually happened, no reason to go any further
131        if ( deltaY === 0 && deltaX === 0 ) { return; }
132
133        // Need to convert lines and pages to pixels if we aren't already in pixels
134        // There are three delta modes:
135        //   * deltaMode 0 is by pixels, nothing to do
136        //   * deltaMode 1 is by lines
137        //   * deltaMode 2 is by pages
138        if ( orgEvent.deltaMode === 1 ) {
139            var lineHeight = $.data(this, 'mousewheel-line-height');
140            delta  *= lineHeight;
141            deltaY *= lineHeight;
142            deltaX *= lineHeight;
143        } else if ( orgEvent.deltaMode === 2 ) {
144            var pageHeight = $.data(this, 'mousewheel-page-height');
145            delta  *= pageHeight;
146            deltaY *= pageHeight;
147            deltaX *= pageHeight;
148        }
149
150        // Store lowest absolute delta to normalize the delta values
151        absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
152
153        if ( !lowestDelta || absDelta < lowestDelta ) {
154            lowestDelta = absDelta;
155
156            // Adjust older deltas if necessary
157            if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
158                lowestDelta /= 40;
159            }
160        }
161
162        // Adjust older deltas if necessary
163        if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
164            // Divide all the things by 40!
165            delta  /= 40;
166            deltaX /= 40;
167            deltaY /= 40;
168        }
169
170        // Get a whole, normalized value for the deltas
171        delta  = Math[ delta  >= 1 ? 'floor' : 'ceil' ](delta  / lowestDelta);
172        deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
173        deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);
174
175        // Normalise offsetX and offsetY properties
176        if ( special.settings.normalizeOffset && this.getBoundingClientRect ) {
177            var boundingRect = this.getBoundingClientRect();
178            offsetX = event.clientX - boundingRect.left;
179            offsetY = event.clientY - boundingRect.top;
180        }
181
182        // Add information to the event object
183        event.deltaX = deltaX;
184        event.deltaY = deltaY;
185        event.deltaFactor = lowestDelta;
186        event.offsetX = offsetX;
187        event.offsetY = offsetY;
188        // Go ahead and set deltaMode to 0 since we converted to pixels
189        // Although this is a little odd since we overwrite the deltaX/Y
190        // properties with normalized deltas.
191        event.deltaMode = 0;
192
193        // Add event and delta to the front of the arguments
194        args.unshift(event, delta, deltaX, deltaY);
195
196        // Clearout lowestDelta after sometime to better
197        // handle multiple device types that give different
198        // a different lowestDelta
199        // Ex: trackpad = 3 and mouse wheel = 120
200        if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
201        nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);
202
203        return ($.event.dispatch || $.event.handle).apply(this, args);
204    }
205
206    function nullLowestDelta() {
207        lowestDelta = null;
208    }
209
210    function shouldAdjustOldDeltas(orgEvent, absDelta) {
211        // If this is an older event and the delta is divisable by 120,
212        // then we are assuming that the browser is treating this as an
213        // older mouse wheel event and that we should divide the deltas
214        // by 40 to try and get a more usable deltaFactor.
215        // Side note, this actually impacts the reported scroll distance
216        // in older browsers and can cause scrolling to be slower than native.
217        // Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
218        return special.settings.adjustOldDeltas && orgEvent.type === 'mousewheel' && absDelta % 120 === 0;
219    }
220
221}));