friendica-addons/mathjax/asset/extensions/a11y/auto-collapse.js

!function(a){var b=a.config.menuSettings,c={},d=MathJax.Ajax.config.path;d.a11y||(d.a11y=a.config.root+"/extensions/a11y");var e=MathJax.Extension["auto-collapse"]={version:"1.5.0",config:a.CombineConfig("auto-collapse",{disabled:!1}),dependents:[],Enable:function(d,e){b.autocollapse=!0,e&&(c.autocollapse=!0),this.config.disabled=!1,MathJax.Extension.collapsible.Enable(!1,e),d&&a.Queue(["Reprocess",a],["CollapseWideMath",this])},Disable:function(d,e){b.autocollapse=!1,e&&(c.autocollapse=!1),this.config.disabled=!0;for(var f=this.dependents.length-1;f>=0;f--){var g=this.dependents[f];g.Disable&&g.Disable(!1,e)}d&&a.Queue(["Rerender",a])},Dependent:function(a){this.dependents.push(a)},Startup:function(){var b=MathJax.Extension.collapsible;b&&b.Dependent(this),a.postInputHooks.Add(["Filter",e],150),a.Queue(function(){return e.CollapseWideMath()}),window.addEventListener?window.addEventListener("resize",e.resizeHandler,!1):window.attachEvent?window.attachEvent("onresize",e.resizeHandler):window.onresize=e.resizeHandler},Filter:function(a,b,c){a.enriched&&!this.config.disabled&&("block"===a.root.Get("display")||c.parentNode.childNodes.length<=3)&&(a.root.SRE={action:this.Actions(a.root)})},Actions:function(a){var b=[];return this.getActions(a,0,b),this.sortActions(b)},getActions:function(a,b,c){if(!a.isToken&&a.data){b++;for(var d=0,e=a.data.length;d<e;d++)if(a.data[d]){var f=a.data[d];f.collapsible?(c[b]||(c[b]=[]),c[b].push(f),this.getActions(f.data[1],b,c)):this.getActions(f,b,c)}}},sortActions:function(a){for(var b=[],c=0,d=a.length;c<d;c++)a[c]&&(b=b.concat(a[c].sort(this.sortActionsBy)));return b},sortActionsBy:function(a,b){return a=a.data[1].complexity,b=b.data[1].complexity,a<b?-1:a>b?1:0},CollapseWideMath:function(b){if(!this.config.disabled){this.GetContainerWidths(b);var c=a.getAllJax(b),d={collapse:[],jax:c,m:c.length,i:0,changed:!1};return this.collapseState(d)}},collapseState:function(b){for(var c=b.collapse;b.i<b.m;){var d=b.jax[b.i],e=d.root.SRE;if(b.changed=!1,e&&e.action.length&&(e.cwidth<e.m||e.cwidth>e.M)){var f=this.getActionWidths(d,b);if(f)return f;this.collapseActions(e,b),b.changed&&c.push(d.SourceElement())}b.i++}if(0!==c.length)return 1===c.length&&(c=c[0]),a.Rerender(c)},collapseActions:function(a,b){for(var c=a.width,d=c,e=1e6,f=a.action.length-1;f>=0;f--){var g=a.action[f],h=g.selection;c>a.cwidth?(g.selection=1,d=g.SREwidth,e=c):g.selection=2,c=g.SREwidth,a.DOMupdate?document.getElementById(g.id).setAttribute("selection",g.selection):g.selection!==h&&(b.changed=!0)}a.m=d,a.M=e},getActionWidths:function(a,b){if(!a.root.SRE.actionWidths){MathJax.OutputJax[a.outputJax].getMetrics(a);try{this.computeActionWidths(a)}catch(a){if(!a.restart)throw a;return MathJax.Callback.After(["collapseState",this,b],a.restart)}b.changed=!0}return null},computeActionWidths:function(a){var b,c=a.root.SRE,d=c.action,e={};for(c.width=a.sreGetRootWidth(e),b=d.length-1;b>=0;b--)d[b].selection=2;for(b=d.length-1;b>=0;b--){var f=d[b];null==f.SREwidth&&(f.selection=1,f.SREwidth=a.sreGetActionWidth(e,f))}c.actionWidths=!0},GetContainerWidths:function(b){var c,d,e,f,g,h=a.getAllJax(b),i=MathJax.HTML.Element("span",{style:{display:"block"}}),j=[];for(c=0,d=h.length;c<d;c++)f=h[c],g=f.root,SRE=g.SRE,SRE&&SRE.action.length&&(null==SRE.width&&(f.sreGetMetrics(),SRE.m=SRE.width,SRE.M=1e6),e=f.SourceElement(),e.previousSibling.style.display="none",e.parentNode.insertBefore(i.cloneNode(!1),e),j.push([f,e]));for(c=0,d=j.length;c<d;c++)f=j[c][0],e=j[c][1],e.previousSibling.offsetWidth&&(f.root.SRE.cwidth=e.previousSibling.offsetWidth*f.root.SRE.em);for(c=0,d=j.length;c<d;c++)f=j[c][0],e=j[c][1],e.parentNode.removeChild(e.previousSibling),e.previousSibling.style.display=""},timer:null,running:!1,retry:!1,saved_delay:0,resizeHandler:function(a){if(!e.config.disabled){if(e.running)return void(e.retry=!0);e.timer&&clearTimeout(e.timer),e.timer=setTimeout(e.resizeAction,100)}},resizeAction:function(){e.timer=null,e.running=!0,a.Queue(function(){e.saved_delay=a.processSectionDelay,a.processSectionDelay=0},["CollapseWideMath",e],["resizeCheck",e])},resizeCheck:function(){e.running=!1,a.processSectionDelay=e.saved_delay,e.retry&&(e.retry=!1,setTimeout(e.resizeHandler,0))}};a.Register.StartupHook("End Extensions",function(){null==b.autocollapse?b.autocollapse=!e.config.disabled:e.config.disabled=!b.autocollapse,a.Register.StartupHook("MathMenu Ready",function(){c=MathJax.Menu.cookie;var a,d=function(a){e[b.autocollapse?"Enable":"Disable"](!0,!0),MathJax.Menu.saveCookie()},f=MathJax.Menu.ITEM,g=MathJax.Menu.menu,h=f.CHECKBOX(["AutoCollapse","Auto Collapse"],"autocollapse",{action:d}),i=(g.FindId("Accessibility")||{}).submenu;i?(a=i.IndexOfId("AutoCollapse"),null!==a?i.items[a]=h:(a=i.IndexOfId("CollapsibleMath"),i.items.splice(a+1,0,h))):(a=g.IndexOfId("CollapsibleMath"),g.items.splice(a+1,0,h));var j=function(){e[b.autocollapse?"Enable":"Disable"]()};MathJax.Extension.collapse?j():MathJax.Hub.Register.StartupHook("Auto Collapse Ready",j)},25)},25)}(MathJax.Hub),MathJax.ElementJax.Augment({sreGetMetrics:function(){MathJax.OutputJax[this.outputJax].sreGetMetrics(this,this.root.SRE)},sreGetRootWidth:function(a){return MathJax.OutputJax[this.outputJax].sreGetRootWidth(this,a)},sreGetActionWidth:function(a,b){return MathJax.OutputJax[this.outputJax].sreGetActionWidth(this,a,b)}}),MathJax.OutputJax.Augment({getMetrics:function(){},sreGetMetrics:function(a,b){b.cwidth=1e6,b.width=0,b.em=12},sreGetRootWidth:function(a,b){return 0},sreGetActionWidth:function(a,b,c){return 0}}),MathJax.Hub.Register.StartupHook("HTML-CSS Jax Ready",function(){MathJax.OutputJax["HTML-CSS"].Augment({sreGetMetrics:function(a,b){b.width=a.root.data[0].HTMLspanElement().parentNode.bbox.w,b.em=1/a.HTMLCSS.em/a.HTMLCSS.scale},sreGetRootWidth:function(a,b){var c=a.root.data[0].HTMLspanElement();return b.box=c.parentNode,b.box.bbox.w},sreGetActionWidth:function(a,b,c){return a.root.data[0].toHTML(b.box).bbox.w}})}),MathJax.Hub.Register.StartupHook("SVG Jax Ready",function(){MathJax.OutputJax.SVG.Augment({getMetrics:function(a){this.em=MathJax.ElementJax.mml.mbase.prototype.em=a.SVG.em,this.ex=a.SVG.ex,this.linebreakWidth=a.SVG.lineWidth,this.cwidth=a.SVG.cwidth},sreGetMetrics:function(a,b){b.width=a.root.SVGdata.w/1e3,b.em=1/a.SVG.em},sreGetRootWidth:function(a,b){return b.span=document.getElementById(a.inputID+"-Frame"),a.root.SVGdata.w/1e3},sreGetActionWidth:function(a,b,c){this.mathDiv=b.span,b.span.appendChild(this.textSVG);try{a.root.data[0].toSVG()}catch(a){var d=a}if(b.span.removeChild(this.textSVG),d)throw d;return a.root.data[0].SVGdata.w/1e3}})}),MathJax.Hub.Register.StartupHook("CommonHTML Jax Ready",function(){MathJax.OutputJax.CommonHTML.Augment({sreGetMetrics:function(a,b){b.width=a.root.CHTML.w,b.em=1/a.CHTML.em/a.CHTML.scale},sreGetRootWidth:function(a,b){return b.span=document.getElementById(a.inputID+"-Frame").firstChild,b.tmp=document.createElement("span"),b.tmp.className=b.span.className,a.root.CHTML.w/a.CHTML.scale},sreGetActionWidth:function(a,b,c){b.span.parentNode.replaceChild(b.tmp,b.span),MathJax.OutputJax.CommonHTML.CHTMLnode=b.tmp;try{a.root.data[0].toCommonHTML(b.tmp)}catch(a){var d=a}if(b.tmp.parentNode.replaceChild(b.span,b.tmp),d)throw d;return a.root.data[0].CHTML.w/a.CHTML.scale}})}),MathJax.Hub.Register.StartupHook("NativeMML Jax Ready",function(){MathJax.OutputJax.NativeMML.Augment({sreGetMetrics:function(a,b){var c=document.getElementById(a.inputID+"-Frame");b.width=c.offsetWidth,b.em=1,b.DOMupdate=!0},sreGetRootWidth:function(a,b){return b.span=document.getElementById(a.inputID+"-Frame").firstChild,b.span.offsetWidth},sreGetActionWidth:function(a,b,c){return document.getElementById(c.id).setAttribute("selection",1),b.span.offsetWidth}})}),MathJax.Ajax.Require("[a11y]/collapsible.js"),MathJax.Hub.Register.StartupHook("Collapsible Ready",function(){MathJax.Extension["auto-collapse"].Startup(),MathJax.Hub.Startup.signal.Post("Auto Collapse Ready"),MathJax.Ajax.loadComplete("[a11y]/auto-collapse.js")});