setMessageSource abstract method

Sets the MessageSource that this component can use for message resolution.

This method is called by the framework when a MessageSource is available in the application context. The MessageSource may be null if no message source has been configured.

Parameters:

• messageSource: The MessageSource instance, or null if not available

Example:

@override
void setMessageSource(MessageSource? messageSource) {
  _messageSource = messageSource;
  if (_messageSource == null) {
    logger.warn('No MessageSource configured, using default messages');
  }
}