Method closeAll

src/cdk/menu/menu-stack.ts:164–175

* Pop off all MenuStackItems and emit each one on the `close` observable one by one. * @param options Options that configure behavior on close.

(options?: CloseOptions)

   * @param options Options that configure behavior on close.
   */
  closeAll(options?: CloseOptions) {
    const {focusNextOnEmpty, focusParentTrigger} = {...options};
    if (!this.isEmpty()) {
      while (!this.isEmpty()) {
        const menuStackItem = this._elements.pop();
        if (menuStackItem) {
          this._close.next({item: menuStackItem, focusParentTrigger});
        }
      }
      this._empty.next(focusNextOnEmpty);
    }
  }

  /** Return true if this stack is empty. */
  isEmpty() {