root / drupal7 / sites / all / themes / danland / scripts / hoverIntent.js @ 64ad485a
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// $Id: hoverIntent.js,v 1.1 2010/07/19 22:25:16 danprobo Exp $
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(function($){ |
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/* hoverIntent by Brian Cherne */
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$.fn.hoverIntent = function(f,g) { |
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// default configuration options
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var cfg = {
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sensitivity: 7, |
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interval: 100, |
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timeout: 0 |
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}; |
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// override configuration options with user supplied object
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cfg = $.extend(cfg, g ? { over: f, out: g } : f ); |
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// instantiate variables
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// cX, cY = current X and Y position of mouse, updated by mousemove event
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// pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
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var cX, cY, pX, pY;
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// A private function for getting mouse position
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var track = function(ev) { |
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cX = ev.pageX; |
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cY = ev.pageY; |
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}; |
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// A private function for comparing current and previous mouse position
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var compare = function(ev,ob) { |
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ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); |
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// compare mouse positions to see if they've crossed the threshold
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if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) {
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$(ob).unbind("mousemove",track); |
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// set hoverIntent state to true (so mouseOut can be called)
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ob.hoverIntent_s = 1;
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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 = 0;
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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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// next three lines copied from jQuery.hover, ignore children onMouseOver/onMouseOut
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var p = (e.type == "mouseover" ? e.fromElement : e.toElement) || e.relatedTarget; |
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while ( p && p != this ) { try { p = p.parentNode; } catch(e) { p = this; } } |
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if ( p == this ) { return false; } |
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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 = jQuery.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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// else e.type == "onmouseover"
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if (e.type == "mouseover") { |
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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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$(ob).bind("mousemove",track); |
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// start polling interval (self-calling timeout) to compare mouse coordinates over time
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if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );} |
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// else e.type == "onmouseout"
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} else {
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// unbind expensive mousemove event
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$(ob).unbind("mousemove",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 == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );} |
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} |
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}; |
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// bind the function to the two event listeners
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return this.mouseover(handleHover).mouseout(handleHover); |
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}; |
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})(jQuery); |