Magento 2 Documentation  2.3
Documentation for Magento 2 CMS v2.3 (December 2018)
ChangeTemplateObserver.php
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1 <?php
8 
10 
12 {
18  public function execute(\Magento\Framework\Event\Observer $observer)
19  {
20  $observer->getBlock()->setTemplate('Magento_ProductVideo::helper/gallery.phtml');
21  }
22 }
execute(\Magento\Framework\Event\Observer $observer)