Method close

src/cdk/menu/menu-stack.ts:128–141

* Pop items off of the stack up to and including `lastItem` and emit each on the close * observable. If the stack is empty or `lastItem` is not on the stack it does nothing. * @param lastItem the last item to pop off the stack. * @param options Options that configure behavior on close.

(lastItem: MenuStackItem, options?: CloseOptions)

   * @param options Options that configure behavior on close.
   */
  close(lastItem: MenuStackItem, options?: CloseOptions) {
    const {focusNextOnEmpty, focusParentTrigger} = {...options};
    if (this._elements.indexOf(lastItem) >= 0) {
      let poppedElement;
      do {
        poppedElement = this._elements.pop()!;
        this._close.next({item: poppedElement, focusParentTrigger});
      } while (poppedElement !== lastItem);

      if (this.isEmpty()) {
        this._empty.next(focusNextOnEmpty);
      }
    }
  }

  /**
   * Pop items off of the stack up to but excluding `lastItem` and emit each on the close