public function setDisabled( $disabled ) {
		$this->disabled = (bool)$disabled;
		$this->toggleClasses( [ 'oo-ui-widget-disabled' ], $this->disabled );
		$this->toggleClasses( [ 'oo-ui-widget-enabled' ], !$this->disabled );
		$this->setAttributes( [ 'aria-disabled' => $this->disabled ? 'true' : 'false' ] );

		return $this;
	}