protected function BackgroundImageCssController::buildMediaQueries in Background Image 2.0.x

Same name and namespace in other branches

1. 8 src/Controller/BackgroundImageCssController.php \Drupal\background_image\Controller\BackgroundImageCssController::buildMediaQueries()
2. 2.x src/Controller/BackgroundImageCssController.php \Drupal\background_image\Controller\BackgroundImageCssController::buildMediaQueries()

Build a list of media queries.

Parameters

\Drupal\background_image\BackgroundImageInterface $background_image: The background image entity.

Return value

array An sorted indexed array of associative arrays.

1 call to BackgroundImageCssController::buildMediaQueries()

BackgroundImageCssController::buildCss in src/Controller/BackgroundImageCssController.php

Generates the necessary CSS for a background image.

File

src/Controller/BackgroundImageCssController.php, line 202

Class

BackgroundImageCssController

Defines a controller to serve image styles.

Namespace

Drupal\background_image\Controller

Code

protected function buildMediaQueries(BackgroundImageInterface $background_image) {
  $responsive_image_style = $this->backgroundImageManager
    ->getResponsiveImageStyle();

  // Immediately return if there is no responsive image style.
  if (!$this->breakpointManager || !$responsive_image_style) {
    return [];
  }
  $mediaQueries = [];

  // Get the necessary variables.
  $breakpoints = $this->breakpointManager
    ->getBreakpointsByGroup($responsive_image_style
    ->getBreakpointGroup());
  $keyed_image_style_mappings = $responsive_image_style
    ->getKeyedImageStyleMappings();
  $retinaRules = $this->backgroundImageManager
    ->getRetinaRules();

  // Retrieve the responsive image sources.
  $i = 0;
  foreach ($breakpoints as $breakpoint_id => $breakpoint) {
    if (isset($keyed_image_style_mappings[$breakpoint_id])) {
      $mediaQuery = trim($breakpoint
        ->getMediaQuery());
      foreach ($keyed_image_style_mappings[$breakpoint_id] as $multiplier => $image_style_mapping) {
        if ($image_style_mapping['image_mapping_type'] !== 'image_style') {
          continue;
        }

        // Use multiplier as a key so it can be sorted in the array later.
        $key = intval(mb_substr($multiplier, 0, -1) * 100) + $i++;
        $image_style = $image_style_mapping['image_mapping'];

        // Merge the multiplier with retina rules.
        if ($multiplier === "2x") {
          $rules = [];
          foreach ($retinaRules as $retinaRule) {
            $rules[] = trim($retinaRule) . ' and ' . trim(preg_replace('/^\\s*(only )?(all|print|screen)\\s?(and)?/', '', $mediaQuery));
          }
          $mediaQueries[$key] = [
            'image_style' => $image_style,
            'multiplier' => $multiplier,
            'query' => implode(',', $rules),
            'url' => $background_image
              ->getImageUrl($image_style),
          ];
        }
        else {
          $mediaQueries[$key] = [
            'image_style' => $image_style,
            'multiplier' => $multiplier,
            'query' => $mediaQuery,
            'url' => $background_image
              ->getImageUrl($image_style),
          ];
        }
      }
    }
  }

  // Sort the the media queries so the multipliers are aft
  ksort($mediaQueries);
  return $mediaQueries;
}