interface BlockInterface

interface BlockInterface extends ConfigEntityInterface {
    
    /**
     * Indicates the block label (title) should be displayed to end users.
     *
     * @deprecated in drupal:8.3.0 and is removed from drupal:9.0.0.
     *   Use \Drupal\Core\Block\BlockPluginInterface::BLOCK_LABEL_VISIBLE.
     *
     * @see https://www.drupal.org/node/2829775
     */
    const BLOCK_LABEL_VISIBLE = BlockPluginInterface::BLOCK_LABEL_VISIBLE;
    
    /**
     * Denotes that a block is not enabled in any region and should not be shown.
     *
     * @deprecated in drupal:8.?.? and is removed from drupal:9.0.0.
     */
    const BLOCK_REGION_NONE = -1;
    
    /**
     * Returns the plugin instance.
     *
     * @return \Drupal\Core\Block\BlockPluginInterface
     *   The plugin instance for this block.
     */
    public function getPlugin();
    
    /**
     * Returns the plugin ID.
     *
     * @return string
     *   The plugin ID for this block.
     */
    public function getPluginId();
    
    /**
     * Returns the region this block is placed in.
     *
     * @return string
     *   The region this block is placed in.
     */
    public function getRegion();
    
    /**
     * Returns the theme ID.
     *
     * @return string
     *   The theme ID for this block instance.
     */
    public function getTheme();
    
    /**
     * Returns an array of visibility condition configurations.
     *
     * @return array
     *   An array of visibility condition configuration keyed by the condition ID.
     */
    public function getVisibility();
    
    /**
     * Gets conditions for this block.
     *
     * @return \Drupal\Core\Condition\ConditionInterface[]|\Drupal\Core\Condition\ConditionPluginCollection
     *   An array or collection of configured condition plugins.
     */
    public function getVisibilityConditions();
    
    /**
     * Gets a visibility condition plugin instance.
     *
     * @param string $instance_id
     *   The condition plugin instance ID.
     *
     * @return \Drupal\Core\Condition\ConditionInterface
     *   A condition plugin.
     */
    public function getVisibilityCondition($instance_id);
    
    /**
     * Sets the visibility condition configuration.
     *
     * @param string $instance_id
     *   The condition instance ID.
     * @param array $configuration
     *   The condition configuration.
     *
     * @return $this
     */
    public function setVisibilityConfig($instance_id, array $configuration);
    
    /**
     * Returns the weight of this block (used for sorting).
     *
     * @return int
     *   The block weight.
     */
    public function getWeight();
    
    /**
     * Sets the region this block is placed in.
     *
     * @param string $region
     *   The region to place this block in.
     *
     * @return $this
     */
    public function setRegion($region);
    
    /**
     * Sets the block weight.
     *
     * @param int $weight
     *   The desired weight.
     *
     * @return $this
     */
    public function setWeight($weight);
    
    /**
     * Creates a duplicate of the block entity.
     *
     * @param string $new_id
     *   (optional) The new ID on the duplicate block.
     * @param string $new_theme
     *   (optional) The theme on the duplicate block.
     *
     * @return static
     *   A clone of $this with all identifiers unset, so saving it inserts a new
     *   entity into the storage system.
     */
    public function createDuplicateBlock($new_id = NULL, $new_theme = NULL);

}