@spectrum-web-components/base/src/Base.js

The `SpectrumElement` base class as created by mixing `SpectrumMixin` onto `LitElement` adopts `dir` values from the `document` at connection time with a fallback to `lrt`. In a TypeScript context, it also enforces the presence of `this.shadowRoot` on ext

"use strict";import{LitElement as m}from"lit";import{version as u}from"@spectrum-web-components/base/src/version.js";const c=new Set,g=()=>{const s=document.documentElement.dir==="rtl"?document.documentElement.dir:"ltr";c.forEach(o=>{o.setAttribute("dir",s)})},w=new MutationObserver(g);w.observe(document.documentElement,{attributes:!0,attributeFilter:["dir"]});const p=s=>typeof s.startManagingContentDirection!="undefined"||s.tagName==="SP-THEME";export function SpectrumMixin(s){class o extends s{get isLTR(){return this.dir==="ltr"}hasVisibleFocusInTree(){const n=((r=document)=>{var l;let t=r.activeElement;for(;t!=null&&t.shadowRoot&&t.shadowRoot.activeElement;)t=t.shadowRoot.activeElement;const a=t?[t]:[];for(;t;){const i=t.assignedSlot||t.parentElement||((l=t.getRootNode())==null?void 0:l.host);i&&a.push(i),t=i}return a})(this.getRootNode())[0];if(!n)return!1;try{return n.matches(":focus-visible")||n.matches(".focus-visible")}catch(r){return n.matches(".focus-visible")}}connectedCallback(){if(!this.hasAttribute("dir")){let e=this.assignedSlot||this.parentNode;for(;e!==document.documentElement&&!p(e);)e=e.assignedSlot||e.parentNode||e.host;if(this.dir=e.dir==="rtl"?e.dir:this.dir||"ltr",e===document.documentElement)c.add(this);else{const{localName:n}=e;n.search("-")>-1&&!customElements.get(n)?customElements.whenDefined(n).then(()=>{e.startManagingContentDirection(this)}):e.startManagingContentDirection(this)}this._dirParent=e}super.connectedCallback()}disconnectedCallback(){super.disconnectedCallback(),this._dirParent&&(this._dirParent===document.documentElement?c.delete(this):this._dirParent.stopManagingContentDirection(this),this.removeAttribute("dir"))}}return o}export class SpectrumElement extends SpectrumMixin(m){}SpectrumElement.VERSION=u;
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