interface EntityDisplayWithLayoutInterface

interface EntityDisplayWithLayoutInterface extends EntityDisplayInterface {
    
    /**
     * Gets the default region.
     *
     * @return string
     *   The default region for this display.
     */
    public function getDefaultRegion();
    
    /**
     * Gets the layout plugin ID for this display.
     *
     * @return string
     *   The layout plugin ID.
     */
    public function getLayoutId();
    
    /**
     * Gets the layout plugin settings for this display.
     *
     * @return mixed[]
     *   The layout plugin settings.
     */
    public function getLayoutSettings();
    
    /**
     * Sets the layout plugin ID for this display.
     *
     * @param string|null $layout_id
     *   Either a valid layout plugin ID, or NULL to remove the layout setting.
     * @param array $layout_settings
     *   (optional) An array of settings for this layout.
     *
     * @return $this
     */
    public function setLayoutId($layout_id, array $layout_settings = []);
    
    /**
     * Sets the layout plugin for this display.
     *
     * @param \Drupal\Core\Layout\LayoutInterface $layout
     *   A layout plugin.
     *
     * @return $this
     */
    public function setLayout(LayoutInterface $layout);
    
    /**
     * Gets the layout plugin for this display.
     *
     * @return \Drupal\Core\Layout\LayoutInterface
     *   The layout plugin.
     */
    public function getLayout();
    
    /**
     * Ensures this entity has a layout.
     *
     * @param string $default_layout_id
     *   (optional) The layout ID to use as a default. Defaults to
     *   'layout_onecol'.
     *
     * @return $this
     */
    public function ensureLayout($default_layout_id = 'layout_onecol');

}