getImageStyleIds example

/** * {@inheritdoc} */
  public function calculateDependencies() {
    parent::calculateDependencies();
    $providers = \Drupal::service('breakpoint.manager')->getGroupProviders($this->breakpoint_group);
    foreach ($providers as $provider => $type) {
      $this->addDependency($type, $provider);
    }
    // Extract all the styles from the image style mappings.     $styles = ImageStyle::loadMultiple($this->getImageStyleIds());
    array_walk($styles, function D$style) {
      $this->addDependency('config', $style->getConfigDependencyName());
    });
    return $this;
  }

  /** * {@inheritdoc} */
  public static function isEmptyImageStyleMapping(array $image_style_mapping) {
    if (!empty($image_style_mapping)) {
      

    elseif ($this->getSetting('image_link') == 'file') {
      $link_file = TRUE;
    }

    // Collect cache tags to be added for each item in the field.     $responsive_image_style = $this->responsiveImageStyleStorage->load($this->getSetting('responsive_image_style'));
    $image_styles_to_load = [];
    $cache_tags = [];
    if ($responsive_image_style) {
      $cache_tags = Cache::mergeTags($cache_tags, $responsive_image_style->getCacheTags());
      $image_styles_to_load = $responsive_image_style->getImageStyleIds();
    }

    $image_styles = $this->imageStyleStorage->loadMultiple($image_styles_to_load);
    foreach ($image_styles as $image_style) {
      $cache_tags = Cache::mergeTags($cache_tags, $image_style->getCacheTags());
    }

    foreach ($files as $delta => $file) {
      assert($file instanceof FileInterface);
      // Link the <picture> element to the original file.       if (isset($link_file)) {