style/adropabove/js/hoverIntent.js

   1 (function($){
   2         /* hoverIntent by Brian Cherne */
   3         $.fn.hoverIntent = function(f,g) {
   4                 // default configuration options
   5                 var cfg = {
   6                         sensitivity: 7,
   7                         interval: 100,
   8                         timeout: 0
   9                 };
  10                 // override configuration options with user supplied object
  11                 cfg = $.extend(cfg, g ? { over: f, out: g } : f );
  12
  13                 // instantiate variables
  14                 // cX, cY = current X and Y position of mouse, updated by mousemove event
  15                 // pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
  16                 var cX, cY, pX, pY;
  17
  18                 // A private function for getting mouse position
  19                 var track = function(ev) {
  20                         cX = ev.pageX;
  21                         cY = ev.pageY;
  22                 };
  23
  24                 // A private function for comparing current and previous mouse position
  25                 var compare = function(ev,ob) {
  26                         ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
  27                         // compare mouse positions to see if they've crossed the threshold
  28                         if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) {
  29                                 $(ob).unbind("mousemove",track);
  30                                 // set hoverIntent state to true (so mouseOut can be called)
  31                                 ob.hoverIntent_s = 1;
  32                                 return cfg.over.apply(ob,[ev]);
  33                         } else {
  34                                 // set previous coordinates for next time
  35                                 pX = cX; pY = cY;
  36                                 // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
  37                                 ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval );
  38                         }
  39                 };
  40
  41                 // A private function for delaying the mouseOut function
  42                 var delay = function(ev,ob) {
  43                         ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
  44                         ob.hoverIntent_s = 0;
  45                         return cfg.out.apply(ob,[ev]);
  46                 };
  47
  48                 // A private function for handling mouse 'hovering'
  49                 var handleHover = function(e) {
  50                         // next three lines copied from jQuery.hover, ignore children onMouseOver/onMouseOut
  51                         var p = (e.type == "mouseover" ? e.fromElement : e.toElement) || e.relatedTarget;
  52                         while ( p && p != this ) { try { p = p.parentNode; } catch(e) { p = this; } }
  53                         if ( p == this ) { return false; }
  54
  55                         // copy objects to be passed into t (required for event object to be passed in IE)
  56                         var ev = jQuery.extend({},e);
  57                         var ob = this;
  58
  59                         // cancel hoverIntent timer if it exists
  60                         if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); }
  61
  62                         // else e.type == "onmouseover"
  63                         if (e.type == "mouseover") {
  64                                 // set "previous" X and Y position based on initial entry point
  65                                 pX = ev.pageX; pY = ev.pageY;
  66                                 // update "current" X and Y position based on mousemove
  67                                 $(ob).bind("mousemove",track);
  68                                 // start polling interval (self-calling timeout) to compare mouse coordinates over time
  69                                 if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );}
  70
  71                         // else e.type == "onmouseout"
  72                         } else {
  73                                 // unbind expensive mousemove event
  74                                 $(ob).unbind("mousemove",track);
  75                                 // if hoverIntent state is true, then call the mouseOut function after the specified delay
  76                                 if (ob.hoverIntent_s == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );}
  77                         }
  78                 };
  79
  80                 // bind the function to the two event listeners
  81                 return this.mouseover(handleHover).mouseout(handleHover);
  82         };
  83
  84 })(jQuery);