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/*!
* # Semantic UI 2.1.6 - Visibility
* http://github.com/semantic-org/semantic-ui/
*
*
* Copyright 2015 Contributors
* Released under the MIT license
* http://opensource.org/licenses/MIT
*
*/
!function(e,o,n,t){"use strict";e.fn.visibility=function(i){var s,c=e(this),r=c.selector||"",a=(new Date).getTime(),l=[],u=arguments[0],d="string"==typeof u,f=[].slice.call(arguments,1);return c.each(function(){var c,b,m,g=e.isPlainObject(i)?e.extend(!0,{},e.fn.visibility.settings,i):e.extend({},e.fn.visibility.settings),p=g.className,v=g.namespace,h=g.error,P=g.metadata,x="."+v,C="module-"+v,y=e(o),R=e(this),V=e(g.context),S=(R.selector||"",R.data(C)),k=o.requestAnimationFrame||o.mozRequestAnimationFrame||o.webkitRequestAnimationFrame||o.msRequestAnimationFrame||function(e){setTimeout(e,0)},T=this,O=!1;m={initialize:function(){m.debug("Initializing",g),m.setup.cache(),m.should.trackChanges()&&("image"==g.type&&m.setup.image(),"fixed"==g.type&&m.setup.fixed(),g.observeChanges&&m.observeChanges(),m.bind.events()),m.save.position(),m.is.visible()||m.error(h.visible,R),g.initialCheck&&m.checkVisibility(),m.instantiate()},instantiate:function(){m.debug("Storing instance",m),R.data(C,m),S=m},destroy:function(){m.verbose("Destroying previous module"),b&&b.disconnect(),y.off("load"+x,m.event.load).off("resize"+x,m.event.resize),V.off("scrollchange"+x,m.event.scrollchange),R.off(x).removeData(C)},observeChanges:function(){"MutationObserver"in o&&(b=new MutationObserver(function(e){m.verbose("DOM tree modified, updating visibility calculations"),m.timer=setTimeout(function(){m.verbose("DOM tree modified, updating sticky menu"),m.refresh()},100)}),b.observe(T,{childList:!0,subtree:!0}),m.debug("Setting up mutation observer",b))},bind:{events:function(){m.verbose("Binding visibility events to scroll and resize"),g.refreshOnLoad&&y.on("load"+x,m.event.load),y.on("resize"+x,m.event.resize),V.off("scroll"+x).on("scroll"+x,m.event.scroll).on("scrollchange"+x,m.event.scrollchange)}},event:{resize:function(){m.debug("Window resized"),g.refreshOnResize&&k(m.refresh)},load:function(){m.debug("Page finished loading"),k(m.refresh)},scroll:function(){g.throttle?(clearTimeout(m.timer),m.timer=setTimeout(function(){V.triggerHandler("scrollchange"+x,[V.scrollTop()])},g.throttle)):k(function(){V.triggerHandler("scrollchange"+x,[V.scrollTop()])})},scrollchange:function(e,o){m.checkVisibility(o)}},precache:function(o,t){o instanceof Array||(o=[o]);for(var i=o.length,s=0,c=[],r=n.createElement("img"),a=function(){s++,s>=o.length&&e.isFunction(t)&&t()};i--;)r=n.createElement("img"),r.onload=a,r.onerror=a,r.src=o[i],c.push(r)},enableCallbacks:function(){m.debug("Allowing callbacks to occur"),O=!1},disableCallbacks:function(){m.debug("Disabling all callbacks temporarily"),O=!0},should:{trackChanges:function(){return d?(m.debug("One time query, no need to bind events"),!1):(m.debug("Callbacks being attached"),!0)}},setup:{cache:function(){m.cache={occurred:{},screen:{},element:{}}},image:function(){var e=R.data(P.src);e&&(m.verbose("Lazy loading image",e),g.once=!0,g.observeChanges=!1,g.onOnScreen=function(){m.debug("Image on screen",T),m.precache(e,function(){m.set.image(e)})})},fixed:function(){m.debug("Setting up fixed"),g.once=!1,g.observeChanges=!1,g.initialCheck=!0,g.refreshOnLoad=!0,i.transition||(g.transition=!1),m.create.placeholder(),m.debug("Added placeholder",c),g.onTopPassed=function(){m.debug("Element passed, adding fixed position",R),m.show.placeholder(),m.set.fixed(),g.transition&&e.fn.transition!==t&&R.transition(g.transition,g.duration)},g.onTopPassedReverse=function(){m.debug("Element returned to position, removing fixed",R),m.hide.placeholder(),m.remove.fixed()}}},create:{placeholder:function(){m.verbose("Creating fixed position placeholder"),c=R.clone(!1).css("display","none").addClass(p.placeholder).insertAfter(R)}},show:{placeholder:function(){m.verbose("Showing placeholder"),c.css("display","block").css("visibility","hidden")}},hide:{placeholder:function(){m.verbose("Hiding placeholder"),c.css("display","none").css("visibility","")}},set:{fixed:function(){m.verbose("Setting element to fixed position"),R.addClass(p.fixed).css({position:"fixed",top:g.offset+"px",left:"auto",zIndex:"1"})},image:function(o){R.attr("src",o),g.transition?e.fn.transition!==t?R.transition(g.transition,g.duration):R.fadeIn(g.duration):R.show()}},is:{onScreen:function(){var e=m.get.elementCalculations();return e.onScreen},offScreen:function(){var e=m.get.elementCalculations();return e.offScreen},visible:function(){return m.cache&&m.cache.element?!(0===m.cache.element.width&&0===m.cache.element.offset.top):!1}},refresh:function(){m.debug("Refreshing constants (width/height)"),"fixed"==g.type&&(m.remove.fixed(),m.remove.occurred()),m.reset(),m.save.position(),g.checkOnRefresh&&m.checkVisibility(),g.onRefresh.call(T)},reset:function(){m.verbose("Reseting all cached 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o=m.get.elementCalculations(),n=e||g.onTopVisibleReverse,i="topVisibleReverse";return e&&(m.debug("Adding callback for top visible reverse",e),g.onTopVisibleReverse=e),o.topVisible?g.once||m.remove.occurred(i):m.get.occurred("topVisible")&&m.execute(n,i),e===t?!o.topVisible:void 0},bottomVisibleReverse:function(e){var o=m.get.elementCalculations(),n=e||g.onBottomVisibleReverse,i="bottomVisibleReverse";return e&&(m.debug("Adding callback for bottom visible reverse",e),g.onBottomVisibleReverse=e),o.bottomVisible?g.once||m.remove.occurred(i):m.get.occurred("bottomVisible")&&m.execute(n,i),e===t?!o.bottomVisible:void 0},topPassedReverse:function(e){var o=m.get.elementCalculations(),n=e||g.onTopPassedReverse,i="topPassedReverse";return e&&(m.debug("Adding callback for top passed reverse",e),g.onTopPassedReverse=e),o.topPassed?g.once||m.remove.occurred(i):m.get.occurred("topPassed")&&m.execute(n,i),e===t?!o.onTopPassed:void 0},bottomPassedReverse:function(e){var 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