forma-embedded-view-sdk/dist/internal/height-observer.js

The Forma Embedded View SDK is a JavaScript library for creating custom extensions in Autodesk Forma (previously Spacemaker).

export class HeightObserver {
    #onHeight;
    #observedElements = new Set();
    #observer = new ResizeObserver(() => {
        const height = Math.max(...[...this.#observedElements].map((it) => it.getBoundingClientRect().height));
        this.#onHeight(height);
    });
    constructor(config) {
        this.#onHeight = config.onHeight;
        this.observe(document.documentElement);
    }
    observe(element) {
        this.#observedElements.add(element);
        this.#observer.observe(element);
    }
    unobserve(element) {
        this.#observedElements.delete(element);
        this.#observer.unobserve(element);
    }
}