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msd2/wordpress/wp-includes/js/hoverIntent.js

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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);