Method _updateResizeEvent

src/gridstack.ts:2088–2106

add or remove the grid element size event handler

(forceRemove = false)

  /** add or remove the grid element size event handler */
  protected _updateResizeEvent(forceRemove = false): GridStack {
    // only add event if we're not nested (parent will call us) and we're auto sizing cells or supporting dynamic column (i.e. doing work)
    // or supporting new sizeToContent option.
    const trackSize = !this.parentGridNode && (this._isAutoCellHeight || this.opts.sizeToContent || this.opts.columnOpts
      || this.engine.nodes.find(n => n.sizeToContent));

    if (!forceRemove && trackSize && !this.resizeObserver) {
      this._sizeThrottle = Utils.throttle(() => this.onResize(), this.opts.cellHeightThrottle);
      this.resizeObserver = new ResizeObserver(() => this._sizeThrottle());
      this.resizeObserver.observe(this.el);
      this._skipInitialResize = true; // makeWidget will originally have called on startup
    } else if ((forceRemove || !trackSize) && this.resizeObserver) {
      this.resizeObserver.disconnect();
      delete this.resizeObserver;
      delete this._sizeThrottle;
    }

    return this;
  }

  /** @internal convert a potential selector into actual element */
  public static getElement(els: GridStackElement = '.grid-stack-item'): GridItemHTMLElement { return Utils.getElement(els) }