https://dcgary.org/libraries/jquery.hover-intent/jquery.hoverIntent.js?v=1.10.2

1/*!
2 * hoverIntent v1.10.2 // 2020.04.28 // jQuery v1.7.0+
3 * http://briancherne.github.io/jquery-hoverIntent/
4 *
5 * You may use hoverIntent under the terms of the MIT license. Basically that
6 * means you are free to use hoverIntent as long as this header is left intact.
7 * Copyright 2007-2019 Brian Cherne
8 */
9
10/**
11 * hoverIntent is similar to jQuery's built-in "hover" method except that
12 * instead of firing the handlerIn function immediately, hoverIntent checks
13 * to see if the user's mouse has slowed down (beneath the sensitivity
14 * threshold) before firing the event. The handlerOut function is only
15 * called after a matching handlerIn.
16 *
17 * // basic usage ... just like .hover()
18 * .hoverIntent( handlerIn, handlerOut )
19 * .hoverIntent( handlerInOut )
20 *
21 * // basic usage ... with event delegation!
22 * .hoverIntent( handlerIn, handlerOut, selector )
23 * .hoverIntent( handlerInOut, selector )
24 *
25 * // using a basic configuration object
26 * .hoverIntent( config )
27 *
28 * @param  handlerIn   function OR configuration object
29 * @param  handlerOut  function OR selector for delegation OR undefined
30 * @param  selector    selector OR undefined
31 * @author Brian Cherne <brian(at)cherne(dot)net>
32 */
33
34;(function(factory) {
35    'use strict';
36    if (typeof define === 'function' && define.amd) {
37        define(['jquery'], factory);
38    } else if (typeof module === 'object' && module.exports) {
39        module.exports = factory(require('jquery'));
40    } else if (jQuery && !jQuery.fn.hoverIntent) {
41        factory(jQuery);
42    }
43})(function($) {
44    'use strict';
45
46    // default configuration values
47    var _cfg = {
48        interval: 100,
49        sensitivity: 6,
50        timeout: 0
51    };
52
53    // counter used to generate an ID for each instance
54    var INSTANCE_COUNT = 0;
55
56    // current X and Y position of mouse, updated during mousemove tracking (shared across instances)
57    var cX, cY;
58
59    // saves the current pointer position coordinates based on the given mousemove event
60    var track = function(ev) {
61        cX = ev.pageX;
62        cY = ev.pageY;
63    };
64
65    // compares current and previous mouse positions
66    var compare = function(ev,$el,s,cfg) {
67        // compare mouse positions to see if pointer has slowed enough to trigger `over` function
68        if ( Math.sqrt( (s.pX-cX)*(s.pX-cX) + (s.pY-cY)*(s.pY-cY) ) < cfg.sensitivity ) {
69            $el.off(s.event,track);
70            delete s.timeoutId;
71            // set hoverIntent state as active for this element (permits `out` handler to trigger)
72            s.isActive = true;
73            // overwrite old mouseenter event coordinates with most recent pointer position
74            ev.pageX = cX; ev.pageY = cY;
75            // clear coordinate data from state object
76            delete s.pX; delete s.pY;
77            return cfg.over.apply($el[0],[ev]);
78        } else {
79            // set previous coordinates for next comparison
80            s.pX = cX; s.pY = cY;
81            // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
82            s.timeoutId = setTimeout( function(){compare(ev, $el, s, cfg);} , cfg.interval );
83        }
84    };
85
86    // triggers given `out` function at configured `timeout` after a mouseleave and clears state
87    var delay = function(ev,$el,s,out) {
88        var data = $el.data('hoverIntent');
89        if (data) {
90            delete data[s.id];
91        }
92        return out.apply($el[0],[ev]);
93    };
94
95    // checks if `value` is a function
96    var isFunction = function(value) {
97        return typeof value === 'function';
98    };
99
100    $.fn.hoverIntent = function(handlerIn,handlerOut,selector) {
101        // instance ID, used as a key to store and retrieve state information on an element
102        var instanceId = INSTANCE_COUNT++;
103
104        // extend the default configuration and parse parameters
105        var cfg = $.extend({}, _cfg);
106        if ( $.isPlainObject(handlerIn) ) {
107            cfg = $.extend(cfg, handlerIn);
108            if ( !isFunction(cfg.out) ) {
109                cfg.out = cfg.over;
110            }
111        } else if ( isFunction(handlerOut) ) {
112            cfg = $.extend(cfg, { over: handlerIn, out: handlerOut, selector: selector } );
113        } else {
114            cfg = $.extend(cfg, { over: handlerIn, out: handlerIn, selector: handlerOut } );
115        }
116
117        // A private function for handling mouse 'hovering'
118        var handleHover = function(e) {
119            // cloned event to pass to handlers (copy required for event object to be passed in IE)
120            var ev = $.extend({},e);
121
122            // the current target of the mouse event, wrapped in a jQuery object
123            var $el = $(this);
124
125            // read hoverIntent data from element (or initialize if not present)
126            var hoverIntentData = $el.data('hoverIntent');
127            if (!hoverIntentData) { $el.data('hoverIntent', (hoverIntentData = {})); }
128
129            // read per-instance state from element (or initialize if not present)
130            var state = hoverIntentData[instanceId];
131            if (!state) { hoverIntentData[instanceId] = state = { id: instanceId }; }
132
133            // state properties:
134            // id = instance ID, used to clean up data
135            // timeoutId = timeout ID, reused for tracking mouse position and delaying "out" handler
136            // isActive = plugin state, true after `over` is called just until `out` is called
137            // pX, pY = previously-measured pointer coordinates, updated at each polling interval
138            // event = string representing the namespaced event used for mouse tracking
139
140            // clear any existing timeout
141            if (state.timeoutId) { state.timeoutId = clearTimeout(state.timeoutId); }
142
143            // namespaced event used to register and unregister mousemove tracking
144            var mousemove = state.event = 'mousemove.hoverIntent.hoverIntent'+instanceId;
145
146            // handle the event, based on its type
147            if (e.type === 'mouseenter') {
148                // do nothing if already active
149                if (state.isActive) { return; }
150                // set "previous" X and Y position based on initial entry point
151                state.pX = ev.pageX; state.pY = ev.pageY;
152                // update "current" X and Y position based on mousemove
153                $el.off(mousemove,track).on(mousemove,track);
154                // start polling interval (self-calling timeout) to compare mouse coordinates over time
155                state.timeoutId = setTimeout( function(){compare(ev,$el,state,cfg);} , cfg.interval );
156            } else { // "mouseleave"
157                // do nothing if not already active
158                if (!state.isActive) { return; }
159                // unbind expensive mousemove event
160                $el.off(mousemove,track);
161                // if hoverIntent state is true, then call the mouseOut function after the specified delay
162                state.timeoutId = setTimeout( function(){delay(ev,$el,state,cfg.out);} , cfg.timeout );
163            }
164        };
165
166        // listen for mouseenter and mouseleave
167        return this.on({'mouseenter.hoverIntent':handleHover,'mouseleave.hoverIntent':handleHover}, cfg.selector);
168    };
169});