Allows the creation of custom blocks through the user interface. File core/modules/block_content/block_content

Defines the custom block entity class. @ContentEntityType( id = "block_content", label = @Translation("Custom block"), bundle_label = @Translation("Custom

public BlockContentForm::form(array $form, FormStateInterface

public BlockContentInterface::setTheme($theme)

public BlockContentInterface::setRevisionL

public BlockContentInterface::getTheme()

public BlockContentInterface::getRevisionLog()

block_content_add_body_field($block_type_id, $label = 'Body') Adds the default body field to a custom block