public function google_qr_code_block::build in Google QR Code Generator 8

Builds and returns the renderable array for this block plugin.

If a block should not be rendered because it has no content, then this method must also ensure to return no content: it must then only return an empty array, or an empty array with #cache set (with cacheability metadata indicating the circumstances for it being empty).

Return value

array A renderable array representing the content of the block.

Overrides BlockPluginInterface::build

File

src/Plugin/Block/google_qr_code_block.php, line 25: Contains \Drupal\google_qr_code\Plugin\Block\google_qr_code_block

Class

google_qr_code_block: Provides a Google QR Code Block

Namespace

Drupal\google_qr_code\Plugin\Block

Code

public function build() {

  // Determine render type, and get the current URL.
  $render_type = \Drupal::config('google_qr_code.settings')
    ->get('whenshow');
  $google_qr_current_url = \Drupal::request()
    ->getUri();
  $qr_code_height = \Drupal::config('google_qr_code.settings')
    ->get('height');
  $qr_code_width = \Drupal::config('google_qr_code.settings')
    ->get('width');
  if ($render_type == 'on_click') {
    $requested_url_obj = Url::fromUri($google_qr_current_url);
    $link_object = Link::fromTextAndUrl(t('Click to see QR Code for this URL'), $requested_url_obj);
    $output = $link_object
      ->toRenderable();
    $output['#class'] = 'google-qr-code-link';
    $output['#cache'] = array(
      'contexts' => array(
        'url.path',
      ),
    );
    $output['#attached']['library'][] = 'google_qr_code/google-qr-code-js';
    $output['#attached']['drupalSettings']['google_qr_code_url'] = $google_qr_current_url;
    $output['#attached']['drupalSettings']['google_qr_code_height'] = $qr_code_height;
    $output['#attached']['drupalSettings']['google_qr_code_width'] = $qr_code_width;

    // Return markup, and return the block as being cached per URL path.
    return $output;
  }
  else {

    // Get the google charts API image URL.
    $google_qr_image_url = "https://chart.googleapis.com/chart?chs=" . $qr_code_width . "x" . $qr_code_height . "&cht=qr&chl=" . $google_qr_current_url . '&chld=H|0';

    // Write the alternate description for the QR image.
    $google_qr_alt = $this
      ->t('QR Code for @url', array(
      '@url' => $google_qr_current_url,
    ));

    // Return markup, and return the block as being cached per URL path.
    return array(
      '#theme' => 'image',
      '#uri' => $google_qr_image_url,
      '#width' => $qr_code_width,
      '#height' => $qr_code_height,
      '#alt' => $google_qr_alt,
      '#class' => 'google-qr-code-image',
      '#cache' => array(
        'contexts' => array(
          'url.path',
        ),
      ),
    );
  }
}

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