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/*! * # Semantic UI 2.0.3 - 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),V=e(this),R=e(g.context),S=(V.selector||"",V.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,V),g.initialCheck&&m.checkVisibility(),m.instantiate()},instantiate:function(){m.debug("Storing instance",m),V.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),R.off("scrollchange"+x,m.event.scrollchange),V.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),R.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(){R.triggerHandler("scrollchange"+x,[R.scrollTop()])},g.throttle)):k(function(){R.triggerHandler("scrollchange"+x,[R.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=V.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",V),m.show.placeholder(),m.set.fixed(),g.transition&&e.fn.transition!==t&&V.transition(g.transition,g.duration)},g.onTopPassedReverse=function(){m.debug("Element returned to position, removing fixed",V),m.hide.placeholder(),m.remove.fixed()}}},create:{placeholder:function(){m.verbose("Creating fixed position placeholder"),c=V.clone(!1).css("display","none").addClass(p.placeholder).insertAfter(V)}},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"),V.addClass(p.fixed).css({position:"fixed",top:g.offset+"px",left:"auto",zIndex:"1"})},image:function(o){V.attr("src",o),g.transit
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