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/*! * hoverIntent v1.8.3 // 2014.08.11 // jQuery v1.9.1+ * http://cherne.net/brian/resources/jquery.hoverIntent.html * * You may use hoverIntent under the terms of the MIT license. Basically that * means you are free to use hoverIntent as long as this header is left intact. * Copyright 2007, 2014 Brian Cherne */ /* hoverIntent is similar to jQuery's built-in "hover" method except that * instead of firing the handlerIn function immediately, hoverIntent checks * to see if the user's mouse has slowed down (beneath the sensitivity * threshold) before firing the event. The handlerOut function is only * called after a matching handlerIn. * * // basic usage ... just like .hover() * .hoverIntent( handlerIn, handlerOut ) * .hoverIntent( handlerInOut ) * * // basic usage ... with event delegation! * .hoverIntent( handlerIn, handlerOut, selector ) * .hoverIntent( handlerInOut, selector ) * * // using a basic configuration object * .hoverIntent( config ) * * @param handlerIn function OR configuration object * @param handlerOut function OR selector for delegation OR undefined * @param selector selector OR undefined * @author Brian Cherne <brian(at)cherne(dot)net> */ (function($) { $.fn.hoverIntent = function(handlerIn,handlerOut,selector) { // default configuration values var cfg = { interval: 100, sensitivity: 6, timeout: 0 }; if ( typeof handlerIn === "object" ) { cfg = $.extend(cfg, handlerIn ); } else if ($.isFunction(handlerOut)) { cfg = $.extend(cfg, { over: handlerIn, out: handlerOut, selector: selector } ); } else { cfg = $.extend(cfg, { over: handlerIn, out: handlerIn, selector: handlerOut } ); } // 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.sqrt( (pX-cX)*(pX-cX) + (pY-cY)*(pY-cY) ) < cfg.sensitivity ) { $(ob).off("mousemove.hoverIntent",track); // set hoverIntent state to true (so mouseOut can be called) ob.hoverIntent_s = true; 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 = false; return cfg.out.apply(ob,[ev]); }; // A private function for handling mouse 'hovering' var handleHover = function(e) { // copy objects to be passed into t (required for event object to be passed in IE) var ev = $.extend({},e); var ob = this; // cancel hoverIntent timer if it exists if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); } // if e.type === "mouseenter" if (e.type === "mouseenter") { // 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).on("mousemove.hoverIntent",track); // start polling interval (self-calling timeout) to compare mouse coordinates over time if (!ob.hoverIntent_s) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );} // else e.type == "mouseleave" } else { // unbind expensive mousemove event $(ob).off("mousemove.hoverIntent",track); // if hoverIntent state is true, then call the mouseOut function after the specified delay if (ob.hoverIntent_s) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );} } }; // listen for mouseenter and mouseleave return this.on({'mouseenter.hoverIntent':handleHover,'mouseleave.hoverIntent':handleHover}, cfg.selector); }; })(jQuery);