https://www.aladin.co.kr/js/jquery-mousewheel.js

1/*! Copyright (c) 2013 Brandon Aaron (http://brandon.aaron.sh)
2 * Licensed under the MIT License (LICENSE.txt).
3 *
4 * Version: 3.1.11
5 *
6 * Requires: jQuery 1.2.2+
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: '3.1.11',
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 $parent = $( elem )['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
65            if ( !$parent.length ) {
66                $parent = $( 'body' );
67            }
68            return parseInt( $parent.css( 'fontSize' ), 10 );
69        },
70
71        getPageHeight: function ( elem ) {
72            return $( elem ).height();
73        },
74
75        settings: {
76            adjustOldDeltas: true, // see shouldAdjustOldDeltas() below
77            normalizeOffset: true  // calls getBoundingClientRect for each event
78        }
79    };
80
81    $.fn.extend( {
82        mousewheel: function ( fn ) {
83            return fn ? this.bind( 'mousewheel', fn ) : this.trigger( 'mousewheel' );
84        },
85
86        unmousewheel: function ( fn ) {
87            return this.unbind( 'mousewheel', fn );
88        }
89    } );
90
91
92    function handler( event ) {
93        var orgEvent = event || window.event,
94            args = slice.call( arguments, 1 ),
95            delta = 0,
96            deltaX = 0,
97            deltaY = 0,
98            absDelta = 0,
99            offsetX = 0,
100            offsetY = 0;
101        event = $.event.fix( orgEvent );
102        event.type = 'mousewheel';
103
104        // Old school scrollwheel delta
105        if ( 'detail' in orgEvent ) { deltaY = orgEvent.detail * -1; }
106        if ( 'wheelDelta' in orgEvent ) { deltaY = orgEvent.wheelDelta; }
107        if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY; }
108        if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }
109
110        // Firefox < 17 horizontal scrolling related to DOMMouseScroll event
111        if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
112            deltaX = deltaY * -1;
113            deltaY = 0;
114        }
115
116        // Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
117        delta = deltaY === 0 ? deltaX : deltaY;
118
119        // New school wheel delta (wheel event)
120        if ( 'deltaY' in orgEvent ) {
121            deltaY = orgEvent.deltaY * -1;
122            delta = deltaY;
123        }
124        if ( 'deltaX' in orgEvent ) {
125            deltaX = orgEvent.deltaX;
126            if ( deltaY === 0 ) { delta = deltaX * -1; }
127        }
128
129        // No change actually happened, no reason to go any further
130        if ( deltaY === 0 && deltaX === 0 ) { return; }
131
132        // Need to convert lines and pages to pixels if we aren't already in pixels
133        // There are three delta modes:
134        //   * deltaMode 0 is by pixels, nothing to do
135        //   * deltaMode 1 is by lines
136        //   * deltaMode 2 is by pages
137        if ( orgEvent.deltaMode === 1 ) {
138            var lineHeight = $.data( this, 'mousewheel-line-height' );
139            delta *= lineHeight;
140            deltaY *= lineHeight;
141            deltaX *= lineHeight;
142        } else if ( orgEvent.deltaMode === 2 ) {
143            var pageHeight = $.data( this, 'mousewheel-page-height' );
144            delta *= pageHeight;
145            deltaY *= pageHeight;
146            deltaX *= pageHeight;
147        }
148
149        // Store lowest absolute delta to normalize the delta values
150        absDelta = Math.max( Math.abs( deltaY ), Math.abs( deltaX ) );
151
152        if ( !lowestDelta || absDelta < lowestDelta ) {
153            lowestDelta = absDelta;
154
155            // Adjust older deltas if necessary
156            if ( shouldAdjustOldDeltas( orgEvent, absDelta ) ) {
157                lowestDelta /= 40;
158            }
159        }
160
161        // Adjust older deltas if necessary
162        if ( shouldAdjustOldDeltas( orgEvent, absDelta ) ) {
163            // Divide all the things by 40!
164            delta /= 40;
165            deltaX /= 40;
166            deltaY /= 40;
167        }
168
169        // Get a whole, normalized value for the deltas
170        delta = Math[delta >= 1 ? 'floor' : 'ceil']( delta / lowestDelta );
171        deltaX = Math[deltaX >= 1 ? 'floor' : 'ceil']( deltaX / lowestDelta );
172        deltaY = Math[deltaY >= 1 ? 'floor' : 'ceil']( deltaY / lowestDelta );
173
174        // Normalise offsetX and offsetY properties
175        if ( special.settings.normalizeOffset && this.getBoundingClientRect ) {
176            var boundingRect = this.getBoundingClientRect();
177            offsetX = event.clientX - boundingRect.left;
178            offsetY = event.clientY - boundingRect.top;
179        }
180
181        // Add information to the event object
182        event.deltaX = deltaX;
183        event.deltaY = deltaY;
184        event.deltaFactor = lowestDelta;
185        event.offsetX = offsetX;
186        event.offsetY = offsetY;
187        // Go ahead and set deltaMode to 0 since we converted to pixels
188        // Although this is a little odd since we overwrite the deltaX/Y
189        // properties with normalized deltas.
190        event.deltaMode = 0;
191
192        // Add event and delta to the front of the arguments
193        args.unshift( event, delta, deltaX, deltaY );
194
195        // Clearout lowestDelta after sometime to better
196        // handle multiple device types that give different
197        // a different lowestDelta
198        // Ex: trackpad = 3 and mouse wheel = 120