]> scripts.mit.edu Git - autoinstalls/wordpress.git/blobdiff - wp-includes/js/hoverIntent.js
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[autoinstalls/wordpress.git] / wp-includes / js / hoverIntent.js
index 1576592de003088fff484b95c30c906c062fa1a5..3dcff261f60ef642177abd6fa806a1a5a1ec9ed1 100644 (file)
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-(function(a){a.fn.hoverIntent=function(k,j){var l={sensitivity:7,interval:100,timeout:0};l=a.extend(l,j?{over:k,out:j}:k);var n,m,h,d;var e=function(f){n=f.pageX;m=f.pageY};var c=function(g,f){f.hoverIntent_t=clearTimeout(f.hoverIntent_t);if((Math.abs(h-n)+Math.abs(d-m))<l.sensitivity){a(f).unbind("mousemove",e);f.hoverIntent_s=1;return l.over.apply(f,[g])}else{h=n;d=m;f.hoverIntent_t=setTimeout(function(){c(g,f)},l.interval)}};var i=function(g,f){f.hoverIntent_t=clearTimeout(f.hoverIntent_t);f.hoverIntent_s=0;return l.out.apply(f,[g])};var b=function(o){var g=jQuery.extend({},o);var f=this;if(f.hoverIntent_t){f.hoverIntent_t=clearTimeout(f.hoverIntent_t)}if(o.type=="mouseenter"){h=g.pageX;d=g.pageY;a(f).bind("mousemove",e);if(f.hoverIntent_s!=1){f.hoverIntent_t=setTimeout(function(){c(g,f)},l.interval)}}else{a(f).unbind("mousemove",e);if(f.hoverIntent_s==1){f.hoverIntent_t=setTimeout(function(){i(g,f)},l.timeout)}}};return this.bind("mouseenter",b).bind("mouseleave",b)}})(jQuery);
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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 r6 // 2011.02.26 // jQuery 1.5.1+
+* <http://cherne.net/brian/resources/jquery.hoverIntent.html>
+* 
+* 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
+* $("ul li").hoverIntent({
+*      sensitivity: 7, // number = sensitivity threshold (must be 1 or higher)
+*      interval: 100,   // number = milliseconds of polling interval
+*      over: showNav,  // function = onMouseOver callback (required)
+*      timeout: 0,   // number = milliseconds delay before onMouseOut function call
+*      out: hideNav    // function = onMouseOut callback (required)
+* });
+* 
+* @param  f  onMouseOver function || An object with configuration options
+* @param  g  onMouseOut function  || Nothing (use configuration options object)
+* @author    Brian Cherne brian(at)cherne(dot)net
+*/
+(function($) {
+       $.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) {
+                       // 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); }
+
+                       // 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).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 == "mouseleave"
+                       } 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.bind('mouseenter',handleHover).bind('mouseleave',handleHover);
+       };
+})(jQuery);
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