function retina_images_form_image_style_form_alter in Retina Images 8

Same name and namespace in other branches

1. 7 retina_images.module \retina_images_form_image_style_form_alter()

Implements hook_form_FORM_ID_alter().

File

./retina_images.module, line 44

This module provides an image effect to assist in outputing high resolution images.

Code

function retina_images_form_image_style_form_alter(&$form, FormStateInterface $form_state) {

  // Get the style to pass to our new theme function.
  $style = $form_state
    ->getFormObject()
    ->getEntity();

  // Don't show the preview on the add form.
  if (isset($form['preview'])) {

    // Override the preview image area to use our own preview.
    // Show the thumbnail preview.
    $preview_arguments = array(
      '#theme' => 'retina_images_image_style_preview',
      '#style' => $style,
    );
    $form['preview'] = array(
      '#type' => 'item',
      '#title' => \Drupal::translation()
        ->translate('Preview'),
      '#markup' => drupal_render($preview_arguments),
      // Render preview above parent elements.
      '#weight' => -5,
    );
  }
}