class Dropdown in Open Social 8.9

Plugin implementation of the 'dropdown' field type.

Plugin annotation

@FieldType(
  id = "dropdown",
  label = @Translation("Dropdown list"),
  description = @Translation("This field stores text values from a dropdown list of allowed 'value => label => description' pairs."),
  category = @Translation("Text"),
  default_widget = "dropdown_widget_type",
  default_formatter = "dropdown_field_formatter",
)

Hierarchy

• class \Drupal\Core\TypedData\TypedData implements PluginInspectionInterface, TypedDataInterface uses DependencySerializationTrait, StringTranslationTrait, TypedDataTrait
  • class \Drupal\Core\TypedData\Plugin\DataType\Map implements \Drupal\Core\TypedData\Plugin\DataType\IteratorAggregate, ComplexDataInterface
    • class \Drupal\Core\Field\FieldItemBase implements FieldItemInterface
      • class \Drupal\dropdown\Plugin\Field\FieldType\Dropdown

1 string reference to 'Dropdown'

dropdown.info.yml in modules/custom/dropdown/dropdown.info.yml

modules/custom/dropdown/dropdown.info.yml

File

modules/custom/dropdown/src/Plugin/Field/FieldType/Dropdown.php, line 22

Namespace

Drupal\dropdown\Plugin\Field\FieldType

class Dropdown extends FieldItemBase {

  /**
   * {@inheritdoc}
   */
  public static function defaultStorageSettings() {
    return [
      'allowed_values' => [],
    ] + parent::defaultStorageSettings();
  }

  /**
   * {@inheritdoc}
   */
  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
    $properties['value'] = DataDefinition::create('string')
      ->setLabel(t('Text value'))
      ->addConstraint('Length', [
      'max' => 255,
    ])
      ->setRequired(TRUE);
    return $properties;
  }

  /**
   * {@inheritdoc}
   */
  public static function schema(FieldStorageDefinitionInterface $field_definition) {
    return [
      'columns' => [
        'value' => [
          'type' => 'varchar',
          'length' => 255,
        ],
      ],
      'indexes' => [
        'value' => [
          'value',
        ],
      ],
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function storageSettingsForm(array &$form, FormStateInterface $form_state, $has_data) {
    $allowed_values = $this
      ->getSetting('allowed_values');
    $element['allowed_values'] = [
      '#type' => 'textarea',
      '#title' => t('Allowed values list'),
      '#default_value' => $this
        ->allowedValuesString($allowed_values),
      '#rows' => 10,
      '#access' => TRUE,
      '#element_validate' => [
        [
          get_class($this),
          'validateAllowedValues',
        ],
      ],
      '#field_has_data' => $has_data,
      '#field_name' => $this
        ->getFieldDefinition()
        ->getName(),
      '#entity_type' => $this
        ->getEntity()
        ->getEntityTypeId(),
      '#allowed_values' => $allowed_values,
    ];
    $element['allowed_values']['#description'] = $this
      ->allowedValuesDescription();
    return $element;
  }

  /**
   * Element_validate callback for options field allowed values.
   *
   * @param array $element
   *   An associative array containing the properties and children of the
   *   generic form element.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form for the form this element belongs to.
   *
   * @see \Drupal\Core\Render\Element\FormElement::processPattern()
   */
  public static function validateAllowedValues(array $element, FormStateInterface $form_state) {
    $values = static::extractAllowedValues($element['#value'], $element['#field_has_data']);
    if (!is_array($values)) {
      $form_state
        ->setError($element, t('Allowed values list: invalid input.'));
    }
    else {

      // Check that keys are valid for the field type.
      foreach ($values as $key => $value) {
        if ($error = static::validateAllowedValue($key)) {
          $form_state
            ->setError($element, $error);
          break;
        }
      }

      // Prevent removing values currently in use.
      if ($element['#field_has_data']) {
        $lost_keys = array_keys(array_diff_key($element['#allowed_values'], $values));
        if (_options_values_in_use($element['#entity_type'], $element['#field_name'], $lost_keys)) {
          $form_state
            ->setError($element, t('Allowed values list: some values are being removed while currently in use.'));
        }
      }
      $form_state
        ->setValueForElement($element, $values);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function isEmpty() {

    // We're empty if we have no value set,
    // or we have a value that's neither a string nor an integer.
    return !isset($this->values['value']) || !is_int($this->values['value']) && !is_string($this->values['value']);
  }

  /**
   * Generates a string representation of an array of 'allowed values'.
   *
   * This string format is suitable for edition in a textarea.
   *
   * @param array $values
   *   An array of values, where array keys are values and array values are
   *   labels.
   *
   * @return string
   *   The string representation of the $values array:
   *    - Values are separated by a carriage return.
   *    - Each value is in the format "value|label" or "value".
   */
  protected function allowedValuesString(array $values) {
    $lines = [];
    foreach ($values as $key => $value) {
      if (is_array($value)) {
        $lines[$key] = implode("|", $value);
      }
    }
    return implode("\n", $lines);
  }

  /**
   * Extracts the allowed values array from the allowed_values element.
   *
   * @param string $string
   *   The raw string to extract values from.
   * @param bool $has_data
   *   The current field already has data inserted or not.
   *
   * @return array|null
   *   The array of extracted key/value pairs, or NULL if the string is invalid.
   *
   * @see \Drupal\options\Plugin\Field\FieldType\ListTextItem::allowedValuesString()
   */
  protected static function extractAllowedValues($string, $has_data) {
    $values = [];
    $list = explode("\n", $string);
    $list = array_map('trim', $list);
    $list = array_filter($list, 'strlen');
    foreach ($list as $position => $text) {

      // Check for an explicit key.
      $matches = [];

      // @TODO Explicit key is necessary !
      if (preg_match('/(.*)\\|(.*)\\|(.*)/', $text, $matches)) {

        // Trim key and value to avoid unwanted spaces issues.
        $value = trim($matches[1]);
        $label = trim($matches[2]);
        $description = trim($matches[3]);
        $values[$value] = [
          'value' => $value,
          'label' => $label,
          'description' => $description,
        ];
      }
      elseif (preg_match('/(.*)\\|(.*)/', $text, $matches)) {

        // Trim key and value to avoid unwanted spaces issues.
        $value = trim($matches[1]);
        $label = trim($matches[2]);
        $values[$value] = [
          'value' => $value,
          'label' => $label,
        ];
      }
    }
    return $values;
  }

  /**
   * Checks whether a candidate allowed value is valid.
   *
   * @param string $option
   *   The option value entered by the user.
   */
  protected static function validateAllowedValue($option) {
  }

  /**
   * {@inheritdoc}
   */
  protected function allowedValuesDescription() {
    $description = '<p>' . t('The possible values this field can contain. Enter one value per line, in the format value|label|description.');
    $description .= '<br/>' . t('The value is the stored value. The label and description will be used in displayed values and edit forms.');
    $description .= '<br/>' . t('The description is optional: if a line contains value|label a description will not be shown.');
    $description .= '</p>';
    return $description;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DependencySerializationTrait::$_entityStorages	protected	property	An array of entity type IDs keyed by the property name of their storages.
DependencySerializationTrait::$_serviceIds	protected	property	An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep	public	function		1
DependencySerializationTrait::__wakeup	public	function		2
Dropdown::allowedValuesDescription	protected	function
Dropdown::allowedValuesString	protected	function	Generates a string representation of an array of 'allowed values'.
Dropdown::defaultStorageSettings	public static	function	Defines the storage-level settings for this plugin. Overrides FieldItemBase::defaultStorageSettings
Dropdown::extractAllowedValues	protected static	function	Extracts the allowed values array from the allowed_values element.
Dropdown::isEmpty	public	function	Determines whether the data structure is empty. Overrides Map::isEmpty
Dropdown::propertyDefinitions	public static	function	Defines field item properties. Overrides FieldItemInterface::propertyDefinitions
Dropdown::schema	public static	function	Returns the schema for the field. Overrides FieldItemInterface::schema
Dropdown::storageSettingsForm	public	function	Returns a form for the storage-level settings. Overrides FieldItemBase::storageSettingsForm
Dropdown::validateAllowedValue	protected static	function	Checks whether a candidate allowed value is valid.
Dropdown::validateAllowedValues	public static	function	Element_validate callback for options field allowed values.
FieldItemBase::calculateDependencies	public static	function	Calculates dependencies for field items. Overrides FieldItemInterface::calculateDependencies	2
FieldItemBase::calculateStorageDependencies	public static	function	Calculates dependencies for field items on the storage level. Overrides FieldItemInterface::calculateStorageDependencies	1
FieldItemBase::defaultFieldSettings	public static	function	Defines the field-level settings for this plugin. Overrides FieldItemInterface::defaultFieldSettings	7
FieldItemBase::delete	public	function	Defines custom delete behavior for field values. Overrides FieldItemInterface::delete	2
FieldItemBase::deleteRevision	public	function	Defines custom revision delete behavior for field values. Overrides FieldItemInterface::deleteRevision
FieldItemBase::fieldSettingsForm	public	function	Returns a form for the field-level settings. Overrides FieldItemInterface::fieldSettingsForm	7
FieldItemBase::fieldSettingsFromConfigData	public static	function	Returns a settings array in the field type's canonical representation. Overrides FieldItemInterface::fieldSettingsFromConfigData	1
FieldItemBase::fieldSettingsToConfigData	public static	function	Returns a settings array that can be stored as a configuration value. Overrides FieldItemInterface::fieldSettingsToConfigData	1
FieldItemBase::generateSampleValue	public static	function	Generates placeholder field values. Overrides FieldItemInterface::generateSampleValue	18
FieldItemBase::getEntity	public	function	Gets the entity that field belongs to. Overrides FieldItemInterface::getEntity
FieldItemBase::getFieldDefinition	public	function	Gets the field definition. Overrides FieldItemInterface::getFieldDefinition
FieldItemBase::getLangcode	public	function	Gets the langcode of the field values held in the object. Overrides FieldItemInterface::getLangcode
FieldItemBase::getSetting	protected	function	Returns the value of a field setting.
FieldItemBase::getSettings	protected	function	Returns the array of field settings.
FieldItemBase::mainPropertyName	public static	function	Returns the name of the main property, if any. Overrides FieldItemInterface::mainPropertyName	8
FieldItemBase::onDependencyRemoval	public static	function	Informs the plugin that a dependency of the field will be deleted. Overrides FieldItemInterface::onDependencyRemoval	1
FieldItemBase::postSave	public	function	Defines custom post-save behavior for field values. Overrides FieldItemInterface::postSave	2
FieldItemBase::preSave	public	function	Defines custom presave behavior for field values. Overrides FieldItemInterface::preSave	7
FieldItemBase::setValue	public	function	Sets the data value. Overrides Map::setValue	4
FieldItemBase::storageSettingsFromConfigData	public static	function	Returns a settings array in the field type's canonical representation. Overrides FieldItemInterface::storageSettingsFromConfigData	2
FieldItemBase::storageSettingsToConfigData	public static	function	Returns a settings array that can be stored as a configuration value. Overrides FieldItemInterface::storageSettingsToConfigData	2
FieldItemBase::view	public	function	Returns a renderable array for a single field item. Overrides FieldItemInterface::view
FieldItemBase::writePropertyValue	protected	function	Different to the parent Map class, we avoid creating property objects as far as possible in order to optimize performance. Thus we just update $this->values if no property object has been created yet. Overrides Map::writePropertyValue
FieldItemBase::__construct	public	function	Constructs a TypedData object given its definition and context. Overrides TypedData::__construct	1
FieldItemBase::__get	public	function	Magic method: Gets a property value. Overrides FieldItemInterface::__get	2
FieldItemBase::__isset	public	function	Magic method: Determines whether a property is set. Overrides FieldItemInterface::__isset
FieldItemBase::__set	public	function	Magic method: Sets a property value. Overrides FieldItemInterface::__set	1
FieldItemBase::__unset	public	function	Magic method: Unsets a property. Overrides FieldItemInterface::__unset
Map::$definition	protected	property	The data definition. Overrides TypedData::$definition
Map::$properties	protected	property	The array of properties.
Map::$values	protected	property	An array of values for the contained properties.
Map::applyDefaultValue	public	function	Applies the default value. Overrides TypedData::applyDefaultValue	4
Map::get	public	function	Gets a property object. Overrides ComplexDataInterface::get
Map::getIterator	public	function
Map::getProperties	public	function	Gets an array of property objects. Overrides ComplexDataInterface::getProperties
Map::getString	public	function	Returns a string representation of the data. Overrides TypedData::getString
Map::getValue	public	function	Gets the data value. Overrides TypedData::getValue	1
Map::onChange	public	function	Overrides TraversableTypedDataInterface::onChange	4
Map::set	public	function	Sets a property value. Overrides ComplexDataInterface::set
Map::toArray	public	function	Returns an array of all property values. Overrides ComplexDataInterface::toArray	1
Map::__clone	public	function	Magic method: Implements a deep clone.
StringTranslationTrait::$stringTranslation	protected	property	The string translation service.	1
StringTranslationTrait::formatPlural	protected	function	Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals	protected	function	Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation	protected	function	Gets the string translation service.
StringTranslationTrait::setStringTranslation	public	function	Sets the string translation service to use.	2
StringTranslationTrait::t	protected	function	Translates a string to the current language or to a given language.
TypedData::$name	protected	property	The property name.
TypedData::$parent	protected	property	The parent typed data object.
TypedData::createInstance	public static	function	Constructs a TypedData object given its definition and context. Overrides TypedDataInterface::createInstance
TypedData::getConstraints	public	function	Gets a list of validation constraints. Overrides TypedDataInterface::getConstraints	9
TypedData::getDataDefinition	public	function	Gets the data definition. Overrides TypedDataInterface::getDataDefinition
TypedData::getName	public	function	Returns the name of a property or item. Overrides TypedDataInterface::getName
TypedData::getParent	public	function	Returns the parent data structure; i.e. either complex data or a list. Overrides TypedDataInterface::getParent
TypedData::getPluginDefinition	public	function	Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition
TypedData::getPluginId	public	function	Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
TypedData::getPropertyPath	public	function	Returns the property path of the data. Overrides TypedDataInterface::getPropertyPath
TypedData::getRoot	public	function	Returns the root of the typed data tree. Overrides TypedDataInterface::getRoot
TypedData::setContext	public	function	Sets the context of a property or item via a context aware parent. Overrides TypedDataInterface::setContext
TypedData::validate	public	function	Validates the currently set data value. Overrides TypedDataInterface::validate
TypedDataTrait::$typedDataManager	protected	property	The typed data manager used for creating the data types.
TypedDataTrait::getTypedDataManager	public	function	Gets the typed data manager.	2
TypedDataTrait::setTypedDataManager	public	function	Sets the typed data manager.	2