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/** * hoverIntent is similar to jQuery's built-in "hover" function except that * instead of firing the onMouseOver event immediately, hoverIntent checks * to see if the user's mouse has slowed down (beneath the sensitivity * threshold) before firing the onMouseOver event. * * hoverIntent r5 // 2007.03.27 // jQuery 1.1.2+ * * * hoverIntent is currently available for use in all personal or commercial * projects under both MIT and GPL licenses. This means that you can choose * the license that best suits your project, and use it accordingly. * * // basic usage (just like .hover) receives onMouseOver and onMouseOut functions * $("ul li").hoverIntent( showNav , hideNav ); * * // advanced usage receives configuration object only * $("ul li").hoverIntent({ * sensitivity: 7, // number = sensitivity threshold (must be 1 or higher) * interval: 100, // number = milliseconds of polling interval * over: showNav, // function = onMouseOver callback (required) * timeout: 0, // number = milliseconds delay before onMouseOut function call * out: hideNav // function = onMouseOut callback (required) * }); * * @param f onMouseOver function || An object with configuration options * @param g onMouseOut function || Nothing (use configuration options object) * @author Brian Cherne */ (function($) { $.fn.hoverIntent = function(f,g) { // default configuration options var cfg = { sensitivity: 7, interval: 100, timeout: 0 }; // override configuration options with user supplied object cfg = $.extend(cfg, g ? { over: f, out: g } : f ); // instantiate variables // cX, cY = current X and Y position of mouse, updated by mousemove event // pX, pY = previous X and Y position of mouse, set by mouseover and polling interval var cX, cY, pX, pY; // A private function for getting mouse position var track = function(ev) { cX = ev.pageX; cY = ev.pageY; }; // A private function for comparing current and previous mouse position var compare = function(ev,ob) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); // compare mouse positions to see if they've crossed the threshold if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) { $(ob).unbind("mousemove",track); // set hoverIntent state to true (so mouseOut can be called) ob.hoverIntent_s = 1; return cfg.over.apply(ob,[ev]); } else { // set previous coordinates for next time pX = cX; pY = cY; // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs) ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval ); } }; // A private function for delaying the mouseOut function var delay = function(ev,ob) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); ob.hoverIntent_s = 0; return cfg.out.apply(ob,[ev]); }; // A private function for handling mouse 'hovering' var handleHover = function(e) { // next three lines copied from jQuery.hover, ignore children onMouseOver/onMouseOut var p = (e.type == "mouseover" ? e.fromElement : e.toElement) || e.relatedTarget; while ( p && p != this ) { try { p = p.parentNode; } catch(e) { p = this; } } if ( p == this ) { return false; } // copy objects to be passed into t (required for event object to be passed in IE) var ev = jQuery.extend({},e); var ob = this; // cancel hoverIntent timer if it exists if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); } // else e.type == "onmouseover" if (e.type == "mouseover") { // set "previous" X and Y position based on initial entry point pX = ev.pageX; pY = ev.pageY; // update "current" X and Y position based on mousemove $(ob).bind("mousemove",track); // start polling interval (self-calling timeout) to compare mouse coordinates over time if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );} // else e.type == "onmouseout" } else { // unbind expensive mousemove event $(ob).unbind("mousemove",track); // if hoverIntent state is true, then call the mouseOut function after the specified delay if (ob.hoverIntent_s == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );} } }; // bind the function to the two event listeners return this.mouseover(handleHover).mouseout(handleHover); }; })(jQuery);

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