Method _setupMouseEnter

src/cdk/menu/menu-item.ts:286–308

* Subscribe to the mouseenter events and close any sibling menu items if this element is moused * into.

()

   * into.
   */
  private _setupMouseEnter() {
    if (!this._isStandaloneItem()) {
      const closeOpenSiblings = () =>
        this._ngZone.run(() => this._menuStack.closeSubMenuOf(this._parentMenu!));

      this._cleanupMouseEnter = this._ngZone.runOutsideAngular(() =>
        this._renderer.listen(this._elementRef.nativeElement, 'mouseenter', () => {
          // Skip fake `mouseenter` events dispatched by touch devices.
          if (
            this._inputModalityDetector.mostRecentModality !== 'touch' &&
            !this._menuStack.isEmpty() &&
            !this.hasMenu
          ) {
            if (this._menuAim) {
              this._menuAim.toggle(closeOpenSiblings);
            } else {
              closeOpenSiblings();
            }
          }
        }),
      );
    }
  }

  /**
   * Return true if the enclosing parent menu is configured in a horizontal orientation, false