Function _setUpPointerTracker

src/cdk/menu/menu-base.ts:256–263

* Set the PointerFocusTracker and ensure that when mouse focus changes the key manager is updated * with the latest menu item under mouse focus.

()

   * with the latest menu item under mouse focus.
   */
  private _setUpPointerTracker() {
    if (this.menuAim) {
      this.ngZone.runOutsideAngular(() => {
        this.pointerTracker = new PointerFocusTracker(this._renderer, this.items);
      });
      this.menuAim.initialize(this, this.pointerTracker!);
    }
  }

  /** Handles focus landing on the host element of the menu. */
  private _handleFocus() {