Function _destroyMenu

src/material/menu/menu-trigger-base.ts:273–321

Closes the menu and does the necessary cleanup.

(reason: MenuCloseReason)

  /** Closes the menu and does the necessary cleanup. */
  protected _destroyMenu(reason: MenuCloseReason) {
    const overlayRef = this._overlayRef;
    const menu = this._menu;

    if (!overlayRef || !this.menuOpen) {
      return;
    }

    this._closingActionsSubscription.unsubscribe();
    this._pendingRemoval?.unsubscribe();

    // Note that we don't wait for the animation to finish if another trigger took
    // over the menu, because the panel will end up empty which looks glitchy.
    if (menu instanceof MatMenu && this._ownsMenu(menu)) {
      this._pendingRemoval = menu._animationDone.pipe(take(1)).subscribe(() => {
        overlayRef.detach();

        // Only detach the lazy content if no other trigger took over the menu, otherwise we may
        // detach something we no longer own. Note that we don't use `this._ownsMenu` here,
        // because the current trigger relinquishes ownership as soon as the closing sequence
        // is kicked off whereas the animation takes some time to play out.
        if (!PANELS_TO_TRIGGERS.has(menu)) {
          menu.lazyContent?.detach();
        }
      });
      menu._setIsOpen(false);
    } else {
      overlayRef.detach();
      menu?.lazyContent?.detach();
    }

    if (menu && this._ownsMenu(menu)) {
      PANELS_TO_TRIGGERS.delete(menu);
    }

    // Always restore focus if the user is navigating using the keyboard or the menu was opened
    // programmatically. We don't restore for non-root triggers, because it can prevent focus
    // from making it back to the root trigger when closing a long chain of menus by clicking
    // on the backdrop.
    if (
      this.restoreFocus &&
      (reason === 'keydown' || !this._openedBy || !this._triggersSubmenu())
    ) {
      this.focus(this._openedBy);
    }

    this._openedBy = undefined;
    this._setIsMenuOpen(false);
  }

  // set state rather than toggle to support triggers sharing a menu
  private _setIsMenuOpen(isOpen: boolean): void {