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/wp-includes/js/ -> hoverIntent.js (source)

   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  });


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