import {createReadOnlyRect} from './utils/geometry.js'; import defineConfigurable from './utils/defineConfigurable.js'; export default class ResizeObserverEntry { /** * Element size of which has changed. * Spec: https://wicg.github.io/ResizeObserver/#dom-resizeobserverentry-target * * @readonly * @type {Element} */ target; /** * Element's content rectangle. * Spec: https://wicg.github.io/ResizeObserver/#dom-resizeobserverentry-contentrect * * @readonly * @type {DOMRectReadOnly} */ contentRect; /** * Creates an instance of ResizeObserverEntry. * * @param {Element} target - Element that is being observed. * @param {DOMRectInit} rectInit - Data of the element's content rectangle. */ constructor(target, rectInit) { const contentRect = createReadOnlyRect(rectInit); // According to the specification following properties are not writable // and are also not enumerable in the native implementation. // // Property accessors are not being used as they'd require to define a // private WeakMap storage which may cause memory leaks in browsers that // don't support this type of collections. defineConfigurable(this, {target, contentRect}); } }