script.php

<?php
/**
 * @package    quantummanagercontent
 * @author     Dmitry Tsymbal <cymbal@delo-design.ru>
 * @copyright  Copyright © 2019 Delo Design & NorrNext. All rights reserved.
 * @license    GNU General Public License version 3 or later; see license.txt
 * @link       https://www.norrnext.com
 */
defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Installer\InstallerAdapter;

class plgEditorsXTDQuantummanagerbuttonInstallerScript
{
	/**
	 * Runs right after any installation action.
	 *
	 * @param   string            $type    Type of PostFlight action. Possible values are:
	 * @param   InstallerAdapter  $parent  Parent object calling object.
	 *
	 * @since  1.1.0
	 */
	function postflight($type, $parent)
	{
		// Enable plugin
		if ($type == 'install')
		{
			$this->enablePlugin($parent);
		}
	}

	/**
	 * Enable plugin after installation.
	 *
	 * @param   InstallerAdapter  $parent  Parent object calling object.
	 *
	 * @since  1.1.0
	 */
	protected function enablePlugin($parent)
	{
		// Prepare plugin object
		$plugin          = new stdClass();
		$plugin->type    = 'plugin';
		$plugin->element = $parent->getElement();
		$plugin->folder  = (string) $parent->getParent()->manifest->attributes()['group'];
		$plugin->enabled = 1;

		// Update record
		Factory::getDbo()->updateObject('#__extensions', $plugin, array('type', 'element', 'folder'));
	}
}