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116 lines
4.8 KiB
JavaScript
116 lines
4.8 KiB
JavaScript
/*!
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* hoverIntent v1.8.1 // 2014.08.11 // jQuery v1.9.1+
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* http://cherne.net/brian/resources/jquery.hoverIntent.html
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*
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* You may use hoverIntent under the terms of the MIT license. Basically that
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* means you are free to use hoverIntent as long as this header is left intact.
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* Copyright 2007, 2014 Brian Cherne
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*/
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/* hoverIntent is similar to jQuery's built-in "hover" method except that
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* instead of firing the handlerIn function immediately, hoverIntent checks
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* to see if the user's mouse has slowed down (beneath the sensitivity
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* threshold) before firing the event. The handlerOut function is only
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* called after a matching handlerIn.
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*
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* // basic usage ... just like .hover()
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* .hoverIntent( handlerIn, handlerOut )
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* .hoverIntent( handlerInOut )
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*
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* // basic usage ... with event delegation!
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* .hoverIntent( handlerIn, handlerOut, selector )
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* .hoverIntent( handlerInOut, selector )
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*
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* // using a basic configuration object
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* .hoverIntent( config )
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*
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* @param handlerIn function OR configuration object
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* @param handlerOut function OR selector for delegation OR undefined
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* @param selector selector OR undefined
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* @author Brian Cherne <brian(at)cherne(dot)net>
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*/
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(function($) {
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$.fn.hoverIntent = function(handlerIn,handlerOut,selector) {
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// default configuration values
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var cfg = {
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interval: 100,
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sensitivity: 6,
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timeout: 0
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};
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if ( typeof handlerIn === "object" ) {
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cfg = $.extend(cfg, handlerIn );
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} else if ($.isFunction(handlerOut)) {
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cfg = $.extend(cfg, { over: handlerIn, out: handlerOut, selector: selector } );
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} else {
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cfg = $.extend(cfg, { over: handlerIn, out: handlerIn, selector: handlerOut } );
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}
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// instantiate variables
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// cX, cY = current X and Y position of mouse, updated by mousemove event
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// pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
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var cX, cY, pX, pY;
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// A private function for getting mouse position
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var track = function(ev) {
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cX = ev.pageX;
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cY = ev.pageY;
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};
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// A private function for comparing current and previous mouse position
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var compare = function(ev,ob) {
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ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
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// compare mouse positions to see if they've crossed the threshold
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if ( Math.sqrt( (pX-cX)*(pX-cX) + (pY-cY)*(pY-cY) ) < cfg.sensitivity ) {
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$(ob).off("mousemove.hoverIntent",track);
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// set hoverIntent state to true (so mouseOut can be called)
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ob.hoverIntent_s = true;
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return cfg.over.apply(ob,[ev]);
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} else {
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// set previous coordinates for next time
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pX = cX; pY = cY;
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// use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
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ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval );
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}
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};
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// A private function for delaying the mouseOut function
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var delay = function(ev,ob) {
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ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
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ob.hoverIntent_s = false;
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return cfg.out.apply(ob,[ev]);
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};
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// A private function for handling mouse 'hovering'
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var handleHover = function(e) {
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// copy objects to be passed into t (required for event object to be passed in IE)
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var ev = $.extend({},e);
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var ob = this;
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// cancel hoverIntent timer if it exists
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if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); }
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// if e.type === "mouseenter"
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if (e.type === "mouseenter") {
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// set "previous" X and Y position based on initial entry point
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pX = ev.pageX; pY = ev.pageY;
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// update "current" X and Y position based on mousemove
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$(ob).on("mousemove.hoverIntent",track);
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// start polling interval (self-calling timeout) to compare mouse coordinates over time
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if (!ob.hoverIntent_s) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );}
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// else e.type == "mouseleave"
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} else {
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// unbind expensive mousemove event
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$(ob).off("mousemove.hoverIntent",track);
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// if hoverIntent state is true, then call the mouseOut function after the specified delay
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if (ob.hoverIntent_s) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );}
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}
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};
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// listen for mouseenter and mouseleave
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return this.on({'mouseenter.hoverIntent':handleHover,'mouseleave.hoverIntent':handleHover}, cfg.selector);
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};
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})(jQuery);
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