OEL-2820: FieldFormatters.

[julien-]

The initial target was to render a FeaturedMedia field using Image style.
Now you can select the setting and it will output, as waited by our Patterns, in the format of array [src, alt]

Additional needs come, and now it can also provide a File in the FileValueObject format

classDiagram

    class FeaturedMediaFormatterBase:::add {
        EntityRepositoryInterface $entityRepository

        defaultSettings() array
        settingsForm(array $form, FormStateInterface $form_state)
       settingsSummary() array
    }
    

    class FeaturedMediaImageFormatter:::add {

      function viewElements(FieldItemListInterface $items, $langcode) array
    }
    FeaturedMediaFormatterBase --|> FeaturedMediaImageFormatter

    class FeaturedMediaImageValueObjectFormatter:::add {

      function viewElements(FieldItemListInterface $items, $langcode = NULL) array ['src','alt']
      function needsEntityLoad(EntityReferenceItem $item)

    }
    FeaturedMediaFormatterBase --|> FeaturedMediaImageValueObjectFormatter 

    class ImageFormatterBase:::existing_drupal {
    }
    class EntityReferenceImageValueObjectFormatter:::add {
      FileUrlGeneratorInterface $fileUrlGenerator
      EntityTypeManagerInterface $entityTypeManager
      LanguageManagerInterface $languageManager

      function defaultSettings() array
      function settingsForm(array $form, FormStateInterface $form_state) array
      function settingsSummary() array
      function view(FieldItemListInterface $items, $langcode = NULL) array
      function viewElements(FieldItemListInterface $items, $langcode = NULL) array ['src','alt']
    }
    ImageFormatterBase --|> EntityReferenceImageValueObjectFormatter

class FileFormatterBase:::existing_drupal {
    }
    class FileValueObjectFormatter:::add {
    
      function viewElements(FieldItemListInterface $items, $langcode) array
    }
    FileFormatterBase --|> FileValueObjectFormatter

    classDef add fill:lightgreen
    classDef existing_drupal fill:dodgerblue

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