Method _subscribeToMouseEnter

src/cdk/menu/menu-trigger.ts:230–254

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

()

   * into.
   */
  private _subscribeToMouseEnter() {
    this._cleanupMouseenter = this._ngZone.runOutsideAngular(() => {
      return this._renderer.listen(this._elementRef.nativeElement, 'mouseenter', () => {
        if (
          // Skip fake `mouseenter` events dispatched by touch devices.
          this._inputModalityDetector.mostRecentModality !== 'touch' &&
          !this.menuStack.isEmpty() &&
          !this.isOpen()
        ) {
          // Closes any sibling menu items and opens the menu associated with this trigger.
          const toggleMenus = () =>
            this._ngZone.run(() => {
              this._closeSiblingTriggers();
              this.open();
            });

          if (this._menuAim) {
            this._menuAim.toggle(toggleMenus);
          } else {
            toggleMenus();
          }
        }
      });
    });
  }

  /** Close out any sibling menu trigger menus. */
  private _closeSiblingTriggers() {