public static function Blazy::preprocessResponsiveImage in Blazy 8.2

Same name and namespace in other branches

1. 8 src/Blazy.php \Drupal\blazy\Blazy::preprocessResponsiveImage()

Overrides variables for responsive-image.html.twig templates.

2 calls to Blazy::preprocessResponsiveImage()

BlazyManagerTest::testPreprocessResponsiveImage in tests/src/Kernel/BlazyManagerTest.php

Tests responsive image integration.

blazy_preprocess_responsive_image in ./blazy.module

Overrides variables for responsive-image.html.twig templates.

File

src/Blazy.php, line 331

Class

Blazy

Provides common blazy utility static methods.

Namespace

Drupal\blazy

Code

public static function preprocessResponsiveImage(array &$variables) {
  $image =& $variables['img_element'];
  $attributes =& $variables['attributes'];
  $placeholder = empty($attributes['data-placeholder']) ? static::PLACEHOLDER : $attributes['data-placeholder'];

  // Bail out if a noscript is requested.
  // @todo figure out to not even enter this method, yet not break ratio, etc.
  if (!isset($attributes['data-b-noscript'])) {

    // Modifies <picture> [data-srcset] attributes on <source> elements.
    if (!$variables['output_image_tag']) {

      /** @var \Drupal\Core\Template\Attribute $source */
      if (isset($variables['sources']) && is_array($variables['sources'])) {
        foreach ($variables['sources'] as &$source) {
          $source
            ->setAttribute('data-srcset', $source['srcset']
            ->value());
          $source
            ->setAttribute('srcset', '');
        }
      }

      // Prevents invalid IMG tag when one pixel placeholder is disabled.
      $image['#uri'] = $placeholder;
      $image['#srcset'] = '';

      // Cleans up the no-longer relevant attributes for controlling element.
      unset($attributes['data-srcset'], $image['#attributes']['data-srcset']);
    }
    else {

      // Modifies <img> element attributes.
      $image['#attributes']['data-srcset'] = $attributes['srcset']
        ->value();
      $image['#attributes']['srcset'] = '';
    }

    // The [data-b-lazy] is a flag indicating 1px placeholder.
    // This prevents double-downloading the fallback image, if enabled.
    if (!empty($attributes['data-b-lazy'])) {
      $image['#uri'] = $placeholder;
    }

    // More shared-with-image attributes are set at self::imageAttributes().
    $image['#attributes']['class'][] = 'b-responsive';
  }

  // Cleans up the no-longer needed flags:
  foreach ([
    'placeholder',
    'b-lazy',
    'b-noscript',
  ] as $key) {
    unset($attributes['data-' . $key], $image['#attributes']['data-' . $key]);
  }
}