/**
  * Callback for displaying the UI for main images tab.
  *
  * @since 1.0.0
  *
  * @param object $post The current post object.
  */
 public function images_tab($post)
 {
     ?>
     <div class="envira-alert envira-clear" style="margin-bottom:10px;">
         <?php 
     _e('<em>Want to make your gallery workflow even better?</em> By upgrading to Envira Pro, you can get access to numerous other features, including: <strong>a fully featured gallery widget</strong>, <strong>complete gallery API</strong>, <strong>powerful gallery documentation</strong>, <strong>full mobile and Retina support</strong>, <strong>dedicated customer support</strong> and so much more! <a href="http://enviragallery.com/lite/?utm_source=liteplugin&utm_medium=link&utm_campaign=WordPress" title="Click here to upgrade to Envira Pro!" target="_blank">Click here to upgrade to Envira Pro!</a>', 'envira-gallery-lite');
     ?>
     </div>
     <?php 
     // Output the custom media upload form.
     Envira_Gallery_Media_Lite::get_instance()->media_upload_form();
     // Prepare output data.
     $gallery_data = get_post_meta($post->ID, '_eg_gallery_data', true);
     ?>
     <ul id="envira-gallery-output" class="envira-clear">
         <?php 
     if (!empty($gallery_data['gallery'])) {
         ?>
             <?php 
         foreach ($gallery_data['gallery'] as $id => $data) {
             ?>
                 <?php 
             echo $this->get_gallery_item($id, $data, $post->ID);
             ?>
             <?php 
         }
         ?>
         <?php 
     }
     ?>
     </ul>
     <?php 
     $this->media_library($post);
 }
 /**
  * Returns the singleton instance of the class.
  *
  * @since 1.0.0
  *
  * @return object The Envira_Gallery_Media_Lite object.
  */
 public static function get_instance()
 {
     if (!isset(self::$instance) && !self::$instance instanceof Envira_Gallery_Media_Lite) {
         self::$instance = new Envira_Gallery_Media_Lite();
     }
     return self::$instance;
 }
 /**
  * Callback for displaying the UI for main images tab.
  *
  * @since 1.0.0
  *
  * @param object $post The current post object.
  */
 public function images_tab($post)
 {
     // Output the custom media upload form.
     Envira_Gallery_Media_Lite::get_instance()->media_upload_form();
     // Prepare output data.
     $gallery_data = get_post_meta($post->ID, '_eg_gallery_data', true);
     ?>
     <ul id="envira-gallery-output" class="envira-clear">
         <?php 
     if (!empty($gallery_data['gallery'])) {
         ?>
             <?php 
         foreach ($gallery_data['gallery'] as $id => $data) {
             ?>
                 <?php 
             echo $this->get_gallery_item($id, $data, $post->ID);
             ?>
             <?php 
         }
         ?>
         <?php 
     }
     ?>
     </ul>
     <?php 
     $this->media_library($post);
 }