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class ImageWidget in Drupal 8

Same name and namespace in other branches
  1. 9 core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php \Drupal\image\Plugin\Field\FieldWidget\ImageWidget

Plugin implementation of the 'image_image' widget.

Plugin annotation


@FieldWidget(
  id = "image_image",
  label = @Translation("Image"),
  field_types = {
    "image"
  }
)

Hierarchy

Expanded class hierarchy of ImageWidget

File

core/modules/image/src/Plugin/Field/FieldWidget/ImageWidget.php, line 25

Namespace

Drupal\image\Plugin\Field\FieldWidget
View source 
class ImageWidget extends FileWidget {

  /**
   * The image factory service.
   *
   * @var \Drupal\Core\Image\ImageFactory
   */
  protected $imageFactory;

  /**
   * Constructs an ImageWidget object.
   *
   * @param string $plugin_id
   *   The plugin_id for the widget.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Field\FieldDefinitionInterface $field_definition
   *   The definition of the field to which the widget is associated.
   * @param array $settings
   *   The widget settings.
   * @param array $third_party_settings
   *   Any third party settings.
   * @param \Drupal\Core\Render\ElementInfoManagerInterface $element_info
   *   The element info manager service.
   * @param \Drupal\Core\Image\ImageFactory $image_factory
   *   The image factory service.
   */
  public function __construct($plugin_id, $plugin_definition, FieldDefinitionInterface $field_definition, array $settings, array $third_party_settings, ElementInfoManagerInterface $element_info, ImageFactory $image_factory = NULL) {
    parent::__construct($plugin_id, $plugin_definition, $field_definition, $settings, $third_party_settings, $element_info);
    $this->imageFactory = $image_factory ?: \Drupal::service('image.factory');
  }

  /**
   * {@inheritdoc}
   */
  public static function defaultSettings() {
    return [
      'progress_indicator' => 'throbber',
      'preview_image_style' => 'thumbnail',
    ] + parent::defaultSettings();
  }

  /**
   * {@inheritdoc}
   */
  public function settingsForm(array $form, FormStateInterface $form_state) {
    $element = parent::settingsForm($form, $form_state);
    $element['preview_image_style'] = [
      '#title' => t('Preview image style'),
      '#type' => 'select',
      '#options' => image_style_options(FALSE),
      '#empty_option' => '<' . t('no preview') . '>',
      '#default_value' => $this
        ->getSetting('preview_image_style'),
      '#description' => t('The preview image will be shown while editing the content.'),
      '#weight' => 15,
    ];
    return $element;
  }

  /**
   * {@inheritdoc}
   */
  public function settingsSummary() {
    $summary = parent::settingsSummary();
    $image_styles = image_style_options(FALSE);

    // Unset possible 'No defined styles' option.
    unset($image_styles['']);

    // Styles could be lost because of enabled/disabled modules that defines
    // their styles in code.
    $image_style_setting = $this
      ->getSetting('preview_image_style');
    if (isset($image_styles[$image_style_setting])) {
      $preview_image_style = t('Preview image style: @style', [
        '@style' => $image_styles[$image_style_setting],
      ]);
    }
    else {
      $preview_image_style = t('No preview');
    }
    array_unshift($summary, $preview_image_style);
    return $summary;
  }

  /**
   * Overrides \Drupal\file\Plugin\Field\FieldWidget\FileWidget::formMultipleElements().
   *
   * Special handling for draggable multiple widgets and 'add more' button.
   */
  protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state) {
    $elements = parent::formMultipleElements($items, $form, $form_state);
    $cardinality = $this->fieldDefinition
      ->getFieldStorageDefinition()
      ->getCardinality();
    $file_upload_help = [
      '#theme' => 'file_upload_help',
      '#description' => '',
      '#upload_validators' => $elements[0]['#upload_validators'],
      '#cardinality' => $cardinality,
    ];
    if ($cardinality == 1) {

      // If there's only one field, return it as delta 0.
      if (empty($elements[0]['#default_value']['fids'])) {
        $file_upload_help['#description'] = $this
          ->getFilteredDescription();
        $elements[0]['#description'] = \Drupal::service('renderer')
          ->renderPlain($file_upload_help);
      }
    }
    else {
      $elements['#file_upload_description'] = $file_upload_help;
    }
    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
    $element = parent::formElement($items, $delta, $element, $form, $form_state);
    $field_settings = $this
      ->getFieldSettings();

    // Add image validation.
    $element['#upload_validators']['file_validate_is_image'] = [];

    // Add upload resolution validation.
    if ($field_settings['max_resolution'] || $field_settings['min_resolution']) {
      $element['#upload_validators']['file_validate_image_resolution'] = [
        $field_settings['max_resolution'],
        $field_settings['min_resolution'],
      ];
    }
    $extensions = $field_settings['file_extensions'];
    $supported_extensions = $this->imageFactory
      ->getSupportedExtensions();

    // If using custom extension validation, ensure that the extensions are
    // supported by the current image toolkit. Otherwise, validate against all
    // toolkit supported extensions.
    $extensions = !empty($extensions) ? array_intersect(explode(' ', $extensions), $supported_extensions) : $supported_extensions;
    $element['#upload_validators']['file_validate_extensions'][0] = implode(' ', $extensions);

    // Add mobile device image capture acceptance.
    $element['#accept'] = 'image/*';

    // Add properties needed by process() method.
    $element['#preview_image_style'] = $this
      ->getSetting('preview_image_style');
    $element['#title_field'] = $field_settings['title_field'];
    $element['#title_field_required'] = $field_settings['title_field_required'];
    $element['#alt_field'] = $field_settings['alt_field'];
    $element['#alt_field_required'] = $field_settings['alt_field_required'];

    // Default image.
    $default_image = $field_settings['default_image'];
    if (empty($default_image['uuid'])) {
      $default_image = $this->fieldDefinition
        ->getFieldStorageDefinition()
        ->getSetting('default_image');
    }

    // Convert the stored UUID into a file ID.
    if (!empty($default_image['uuid']) && ($entity = \Drupal::service('entity.repository')
      ->loadEntityByUuid('file', $default_image['uuid']))) {
      $default_image['fid'] = $entity
        ->id();
    }
    $element['#default_image'] = !empty($default_image['fid']) ? $default_image : [];
    return $element;
  }

  /**
   * Form API callback: Processes a image_image field element.
   *
   * Expands the image_image type to include the alt and title fields.
   *
   * This method is assigned as a #process callback in formElement() method.
   */
  public static function process($element, FormStateInterface $form_state, $form) {
    $item = $element['#value'];
    $item['fids'] = $element['fids']['#value'];
    $element['#theme'] = 'image_widget';

    // Add the image preview.
    if (!empty($element['#files']) && $element['#preview_image_style']) {
      $file = reset($element['#files']);
      $variables = [
        'style_name' => $element['#preview_image_style'],
        'uri' => $file
          ->getFileUri(),
      ];
      $dimension_key = $variables['uri'] . '.image_preview_dimensions';

      // Determine image dimensions.
      if (isset($element['#value']['width']) && isset($element['#value']['height'])) {
        $variables['width'] = $element['#value']['width'];
        $variables['height'] = $element['#value']['height'];
      }
      elseif ($form_state
        ->has($dimension_key)) {
        $variables += $form_state
          ->get($dimension_key);
      }
      else {
        $image = \Drupal::service('image.factory')
          ->get($file
          ->getFileUri());
        if ($image
          ->isValid()) {
          $variables['width'] = $image
            ->getWidth();
          $variables['height'] = $image
            ->getHeight();
        }
        else {
          $variables['width'] = $variables['height'] = NULL;
        }
      }
      $element['preview'] = [
        '#weight' => -10,
        '#theme' => 'image_style',
        '#width' => $variables['width'],
        '#height' => $variables['height'],
        '#style_name' => $variables['style_name'],
        '#uri' => $variables['uri'],
      ];

      // Store the dimensions in the form so the file doesn't have to be
      // accessed again. This is important for remote files.
      $form_state
        ->set($dimension_key, [
        'width' => $variables['width'],
        'height' => $variables['height'],
      ]);
    }
    elseif (!empty($element['#default_image'])) {
      $default_image = $element['#default_image'];
      $file = File::load($default_image['fid']);
      if (!empty($file)) {
        $element['preview'] = [
          '#weight' => -10,
          '#theme' => 'image_style',
          '#width' => $default_image['width'],
          '#height' => $default_image['height'],
          '#style_name' => $element['#preview_image_style'],
          '#uri' => $file
            ->getFileUri(),
        ];
      }
    }

    // Add the additional alt and title fields.
    $element['alt'] = [
      '#title' => t('Alternative text'),
      '#type' => 'textfield',
      '#default_value' => isset($item['alt']) ? $item['alt'] : '',
      '#description' => t('Short description of the image used by screen readers and displayed when the image is not loaded. This is important for accessibility.'),
      // @see https://www.drupal.org/node/465106#alt-text
      '#maxlength' => 512,
      '#weight' => -12,
      '#access' => (bool) $item['fids'] && $element['#alt_field'],
      '#required' => $element['#alt_field_required'],
      '#element_validate' => $element['#alt_field_required'] == 1 ? [
        [
          get_called_class(),
          'validateRequiredFields',
        ],
      ] : [],
    ];
    $element['title'] = [
      '#type' => 'textfield',
      '#title' => t('Title'),
      '#default_value' => isset($item['title']) ? $item['title'] : '',
      '#description' => t('The title is used as a tool tip when the user hovers the mouse over the image.'),
      '#maxlength' => 1024,
      '#weight' => -11,
      '#access' => (bool) $item['fids'] && $element['#title_field'],
      '#required' => $element['#title_field_required'],
      '#element_validate' => $element['#title_field_required'] == 1 ? [
        [
          get_called_class(),
          'validateRequiredFields',
        ],
      ] : [],
    ];
    return parent::process($element, $form_state, $form);
  }

  /**
   * Validate callback for alt and title field, if the user wants them required.
   *
   * This is separated in a validate function instead of a #required flag to
   * avoid being validated on the process callback.
   */
  public static function validateRequiredFields($element, FormStateInterface $form_state) {

    // Only do validation if the function is triggered from other places than
    // the image process form.
    $triggering_element = $form_state
      ->getTriggeringElement();
    if (!empty($triggering_element['#submit']) && in_array('file_managed_file_submit', $triggering_element['#submit'], TRUE)) {
      $form_state
        ->setLimitValidationErrors([]);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function calculateDependencies() {
    $dependencies = parent::calculateDependencies();
    $style_id = $this
      ->getSetting('preview_image_style');

    /** @var \Drupal\image\ImageStyleInterface $style */
    if ($style_id && ($style = ImageStyle::load($style_id))) {

      // If this widget uses a valid image style to display the preview of the
      // uploaded image, add that image style configuration entity as dependency
      // of this widget.
      $dependencies[$style
        ->getConfigDependencyKey()][] = $style
        ->getConfigDependencyName();
    }
    return $dependencies;
  }

  /**
   * {@inheritdoc}
   */
  public function onDependencyRemoval(array $dependencies) {
    $changed = parent::onDependencyRemoval($dependencies);
    $style_id = $this
      ->getSetting('preview_image_style');

    /** @var \Drupal\image\ImageStyleInterface $style */
    if ($style_id && ($style = ImageStyle::load($style_id))) {
      if (!empty($dependencies[$style
        ->getConfigDependencyKey()][$style
        ->getConfigDependencyName()])) {

        /** @var \Drupal\image\ImageStyleStorageInterface $storage */
        $storage = \Drupal::entityTypeManager()
          ->getStorage($style
          ->getEntityTypeId());
        $replacement_id = $storage
          ->getReplacementId($style_id);

        // If a valid replacement has been provided in the storage, replace the
        // preview image style with the replacement.
        if ($replacement_id && ImageStyle::load($replacement_id)) {
          $this
            ->setSetting('preview_image_style', $replacement_id);
        }
        else {
          $this
            ->setSetting('preview_image_style', '');
        }

        // Signal that the formatter plugin settings were updated.
        $changed = TRUE;
      }
    }
    return $changed;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
AllowedTagsXssTrait::allowedTags public function Returns a list of tags allowed by AllowedTagsXssTrait::fieldFilterXss().
AllowedTagsXssTrait::displayAllowedTags public function Returns a human-readable list of allowed tags for display in help texts.
AllowedTagsXssTrait::fieldFilterXss public function Filters an HTML string to prevent XSS vulnerabilities.
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
FileWidget::create public static function Creates an instance of the plugin. Overrides WidgetBase::create
FileWidget::extractFormValues public function Extracts field values from submitted form values. Overrides WidgetBase::extractFormValues
FileWidget::flagErrors public function Reports field-level validation errors against actual form elements. Overrides WidgetBase::flagErrors
FileWidget::getDescriptionFromElement protected static function Retrieves the file description from a field field element.
FileWidget::massageFormValues public function Massages the form values into the format expected for field values. Overrides WidgetBase::massageFormValues
FileWidget::processMultiple public static function Form API callback: Processes a group of file_generic field elements.
FileWidget::submit public static function Form submission handler for upload/remove button of formElement().
FileWidget::validateMultipleCount public static function Form element validation callback for upload element on file widget. Checks if user has uploaded more files than allowed.
FileWidget::value public static function Form API callback. Retrieves the value for the file_generic field element.
ImageWidget::$imageFactory protected property The image factory service.
ImageWidget::calculateDependencies public function Calculates dependencies for the configured plugin. Overrides PluginSettingsBase::calculateDependencies
ImageWidget::defaultSettings public static function Defines the default settings for this plugin. Overrides FileWidget::defaultSettings
ImageWidget::formElement public function Returns the form for a single field widget. Overrides FileWidget::formElement
ImageWidget::formMultipleElements protected function Overrides \Drupal\file\Plugin\Field\FieldWidget\FileWidget::formMultipleElements(). Overrides FileWidget::formMultipleElements
ImageWidget::onDependencyRemoval public function Informs the plugin that some configuration it depends on will be deleted. Overrides PluginSettingsBase::onDependencyRemoval
ImageWidget::process public static function Form API callback: Processes a image_image field element. Overrides FileWidget::process
ImageWidget::settingsForm public function Returns a form to configure settings for the widget. Overrides FileWidget::settingsForm
ImageWidget::settingsSummary public function Returns a short summary for the current widget settings. Overrides FileWidget::settingsSummary
ImageWidget::validateRequiredFields public static function Validate callback for alt and title field, if the user wants them required.
ImageWidget::__construct public function Constructs an ImageWidget object. Overrides FileWidget::__construct
MessengerTrait::$messenger protected property The messenger. 29
MessengerTrait::messenger public function Gets the messenger. 29
MessengerTrait::setMessenger public function Sets the messenger.
PluginBase::$configuration protected property Configuration information passed into the plugin. 1
PluginBase::$pluginDefinition protected property The plugin implementation definition. 1
PluginBase::$pluginId protected property The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR constant A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId public function Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId public function Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition public function Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition 3
PluginBase::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::isConfigurable public function Determines if the plugin is configurable.
PluginSettingsBase::$defaultSettingsMerged protected property Whether default settings have been merged into the current $settings.
PluginSettingsBase::$thirdPartySettings protected property The plugin settings injected by third party modules.
PluginSettingsBase::getSetting public function Returns the value of a setting, or its default value if absent. Overrides PluginSettingsInterface::getSetting
PluginSettingsBase::getSettings public function Returns the array of settings, including defaults for missing settings. Overrides PluginSettingsInterface::getSettings
PluginSettingsBase::getThirdPartyProviders public function Gets the list of third parties that store information. Overrides ThirdPartySettingsInterface::getThirdPartyProviders
PluginSettingsBase::getThirdPartySetting public function Gets the value of a third-party setting. Overrides ThirdPartySettingsInterface::getThirdPartySetting
PluginSettingsBase::getThirdPartySettings public function Gets all third-party settings of a given module. Overrides ThirdPartySettingsInterface::getThirdPartySettings
PluginSettingsBase::mergeDefaults protected function Merges default settings values into $settings.
PluginSettingsBase::setSetting public function Sets the value of a setting for the plugin. Overrides PluginSettingsInterface::setSetting
PluginSettingsBase::setSettings public function Sets the settings for the plugin. Overrides PluginSettingsInterface::setSettings
PluginSettingsBase::setThirdPartySetting public function Sets the value of a third-party setting. Overrides ThirdPartySettingsInterface::setThirdPartySetting
PluginSettingsBase::unsetThirdPartySetting public function Unsets a third-party setting. Overrides ThirdPartySettingsInterface::unsetThirdPartySetting
StringTranslationTrait::$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.
WidgetBase::$fieldDefinition protected property The field definition.
WidgetBase::$settings protected property The widget settings. Overrides PluginSettingsBase::$settings
WidgetBase::addMoreAjax public static function Ajax callback for the "Add another item" button.
WidgetBase::addMoreSubmit public static function Submission handler for the "Add another item" button.
WidgetBase::afterBuild public static function After-build handler for field elements in a form.
WidgetBase::errorElement public function Assigns a field-level validation error to the right widget sub-element. Overrides WidgetInterface::errorElement 8
WidgetBase::form public function Creates a form element for a field. Overrides WidgetBaseInterface::form 3
WidgetBase::formSingleElement protected function Generates the form element for a single copy of the widget.
WidgetBase::getFieldSetting protected function Returns the value of a field setting.
WidgetBase::getFieldSettings protected function Returns the array of field settings.
WidgetBase::getFilteredDescription protected function Returns the filtered field description.
WidgetBase::getWidgetState public static function Retrieves processing information about the widget from $form_state. Overrides WidgetBaseInterface::getWidgetState
WidgetBase::getWidgetStateParents protected static function Returns the location of processing information within $form_state.
WidgetBase::handlesMultipleValues protected function Returns whether the widget handles multiple values.
WidgetBase::isApplicable public static function Returns if the widget can be used for the provided field. Overrides WidgetInterface::isApplicable 4
WidgetBase::isDefaultValueWidget protected function Returns whether the widget used for default value form.
WidgetBase::setWidgetState public static function Stores processing information about the widget in $form_state. Overrides WidgetBaseInterface::setWidgetState