@arcgis/core/core/accessorSupport/ObservableBase.js

ArcGIS Maps SDK for JavaScript: A complete 2D and 3D mapping and data visualization API

/*
All material copyright ESRI, All Rights Reserved, unless otherwise specified.
See https://js.arcgis.com/4.32/esri/copyright.txt for details.
*/
import{makeHandle as e}from"../handleUtils.js";import{ObservationHandle as s}from"./tracking/ObservationHandle.js";class r{constructor(){this._observers=null,this.destroyed=!1}observe(e){if(this.destroyed||e.destroyed)return t;null==this._observers&&(this._observers=[]);const r=this._observers;let o=!1,i=!1;const n=r.length;for(let s=0;s<n;++s){const t=r[s];if(t.destroyed)i=!0;else if(t===e){o=!0;break}}return o||(r.push(e),i&&this._removeDestroyedObservers()),new s(r,e)}_removeDestroyedObservers(){const e=this._observers;if(!e||0===e.length)return;const s=e.length;let r=0;for(let t=0;t<s;++t){for(;t+r<s;){if(!e[t+r].destroyed)break;++r}if(r>0){if(!(t+r<s))break;e[t]=e[t+r]}}e.length=s-r}destroy(){if(this.destroyed)return;this.destroyed=!0;const e=this._observers;if(null!=e){for(const s of e)s.onCommitted();this._observers=null}}}const t=e();export{r as ObservableBase};