<?php
/**
 * @package     Joomla.Site
 * @subpackage  com_config
 *
 * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Config\Site\View\Templates;

\defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\MVC\Factory\MVCFactory;
use Joomla\CMS\MVC\View\HtmlView as BaseHtmlView;
use Joomla\Component\Config\Administrator\Controller\RequestController;

/**
 * View to edit a template style.
 *
 * @since  3.2
 */
class HtmlView extends BaseHtmlView
{
	/**
	 * The data to be displayed in the form
	 *
	 * @var   array
	 * @since 3.2
	 */
	public $item;

	/**
	 * The form object
	 *
	 * @var   \JForm
	 * @since 3.2
	 */
	public $form;

	/**
	 * Is the current user a super administrator?
	 *
	 * @var   boolean
	 * @since 3.2
	 */
	protected $userIsSuperAdmin;

	/**
	 * The page class suffix
	 *
	 * @var    string
	 * @since  4.0.0
	 */
	protected $pageclass_sfx = '';

	/**
	 * The page parameters
	 *
	 * @var    \Joomla\Registry\Registry|null
	 * @since  4.0.0
	 */
	protected $params = null;

	/**
	 * Method to render the view.
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	public function display($tpl = null)
	{
		$user = Factory::getUser();
		$this->userIsSuperAdmin = $user->authorise('core.admin');

		$app   = Factory::getApplication();

		$app->input->set('id', $app->getTemplate(true)->id);

		/** @var MVCFactory $factory */
		$factory = $app->bootComponent('com_templates')->getMVCFactory();

		$view = $factory->createView('Style', 'Administrator', 'Json');
		$view->setModel($factory->createModel('Style', 'Administrator'), true);

		$view->document = $this->document;

		$json = $view->display();

		// Execute backend controller
		$serviceData = json_decode($json, true);

		// Access backend com_config
		$requestController = new RequestController;

		// Execute backend controller
		$configData = json_decode($requestController->getJson(), true);

		$data = array_merge($configData, $serviceData);

		/** @var \JForm $form */
		$form = $this->getForm();

		if ($form)
		{
			$form->bind($data);
		}

		$this->form = $form;

		$this->data = $serviceData;

		$this->_prepareDocument();

		parent::display($tpl);
	}

	/**
	 * Prepares the document.
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	protected function _prepareDocument()
	{
		$params = Factory::getApplication()->getParams();

		// Because the application sets a default page title, we need to get it
		// right from the menu item itself

		$this->setDocumentTitle($params->get('page_title', ''));

		if ($params->get('menu-meta_description'))
		{
			$this->document->setDescription($params->get('menu-meta_description'));
		}

		if ($params->get('robots'))
		{
			$this->document->setMetaData('robots', $params->get('robots'));
		}

		// Escape strings for HTML output
		$this->pageclass_sfx = htmlspecialchars($params->get('pageclass_sfx'));
		$this->params        = &$params;
	}
}

• [F] HtmlView.php
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