Method constructor

src/cdk/listbox/listbox.ts:447–460

()

  private _previousActiveOption: CdkOption<T> | null = null;

  constructor() {
    if (this._isBrowser) {
      const renderer = inject(Renderer2);

      this._cleanupWindowBlur = this.ngZone.runOutsideAngular(() => {
        return renderer.listen('window', 'blur', () => {
          if (this.element.contains(document.activeElement) && this._previousActiveOption) {
            this._setActiveOption(this._previousActiveOption);
            this._previousActiveOption = null;
          }
        });
      });
    }
  }

  ngAfterContentInit() {
    if (typeof ngDevMode === 'undefined' || ngDevMode) {