author | hurons@caf4f556-3d62-0410-8435-a86758001935 |
Tue, 02 Feb 2010 15:44:16 +0000 | |
branch | wordpress |
changeset 132 | 4d4862461b8d |
parent 109 | 03b0d1493584 |
permissions | -rw-r--r-- |
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/** |
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* hoverIntent is similar to jQuery's built-in "hover" function except that |
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* instead of firing the onMouseOver event 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 onMouseOver event. |
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* |
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* hoverIntent r5 // 2007.03.27 // jQuery 1.1.2+ |
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* <http://cherne.net/brian/resources/jquery.hoverIntent.html> |
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* |
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* hoverIntent is currently available for use in all personal or commercial |
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* projects under both MIT and GPL licenses. This means that you can choose |
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* the license that best suits your project, and use it accordingly. |
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* |
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* // basic usage (just like .hover) receives onMouseOver and onMouseOut functions |
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* $("ul li").hoverIntent( showNav , hideNav ); |
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* |
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* // advanced usage receives configuration object only |
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* $("ul li").hoverIntent({ |
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* sensitivity: 7, // number = sensitivity threshold (must be 1 or higher) |
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* interval: 100, // number = milliseconds of polling interval |
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* over: showNav, // function = onMouseOver callback (required) |
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* timeout: 0, // number = milliseconds delay before onMouseOut function call |
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* out: hideNav // function = onMouseOut callback (required) |
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* }); |
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* |
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* @param f onMouseOver function || An object with configuration options |
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* @param g onMouseOut function || Nothing (use configuration options object) |
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* @author Brian Cherne <brian@cherne.net> |
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*/ |
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(function($) { |
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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 = $.extend(cfg, g ? { over: f, out: g } : f ); |
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|
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// instantiate variables |
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// cX, cY = current X and Y position of mouse, updated by mousemove event |
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// pX, pY = previous X and Y position of mouse, set by mouseover and polling interval |
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var cX, cY, pX, pY; |
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// A private function for getting mouse position |
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var track = function(ev) { |
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cX = ev.pageX; |
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cY = ev.pageY; |
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}; |
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// A private function for comparing current and previous mouse position |
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var compare = function(ev,ob) { |
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ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); |
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// compare mouse positions to see if they've crossed the threshold |
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if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) { |
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$(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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// workaround for Mozilla bug: not firing mouseout/mouseleave on absolute positioned elements over textareas and input type="text" |
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var handleHover = function(e) { |
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var t = this; |
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// next two 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 ) { |
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if ( $.browser.mozilla ) { |
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if ( e.type == "mouseout" ) { |
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t.mtout = setTimeout( function(){doHover(e,t);}, 30 ); |
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} else { |
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if (t.mtout) { t.mtout = clearTimeout(t.mtout); } |
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} |
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} |
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return; |
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} else { |
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if (t.mtout) { t.mtout = clearTimeout(t.mtout); } |
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doHover(e,t); |
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} |
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}; |
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// A private function for handling mouse 'hovering' |
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var doHover = function(e,ob) { |
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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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// 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); |