/**
* Public function that creates a single instance
*/
public static function getInstance($parent)
{
if (!isset(self::$_instance)) {
self::$_instance = new self($parent);
}
return self::$_instance;
}
/**
* Constructor
*/
protected function __construct()
{
global $section;
parent::__construct(__FILE__);
// register delivery method and create menu items
if (class_exists('backend') && class_exists('shop')) {
require_once 'units/method.php';
require_once 'units/pickup_method.php';
Simple_DeliveryMethod::getInstance($this);
Simple_ManualPickupMethod::getInstance($this);
$backend = backend::getInstance();
$method_menu = $backend->getMenu('shop_delivery_methods');
if (!is_null($method_menu)) {
$method_menu->addChild('', new backend_MenuItem($this->getLanguageConstant('menu_delivery'), url_GetFromFilePath($this->path . 'images/icon.png'), window_Open('delivery_intervals', 650, $this->getLanguageConstant('title_intervals'), true, true, backend_UrlMake($this->name, 'intervals')), $level = 5));
}
}
// register backend style
$head_tag = head_tag::getInstance();
$head_tag->addTag('link', array('href' => url_GetFromFilePath($this->path . 'include/backend.css'), 'rel' => 'stylesheet', 'type' => 'text/css'));
$head_tag->addTag('script', array('src' => url_GetFromFilePath($this->path . 'include/backend.js'), 'type' => 'text/javascript'));
}