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libraries/fof30/Model/DataModel/Behaviour/PageParametersToState.php

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+<?php
+/**
+ * @package   FOF
+ * @copyright Copyright (c)2010-2021 Nicholas K. Dionysopoulos / Akeeba Ltd
+ * @license   GNU General Public License version 2, or later
+ */
+
+namespace FOF30\Model\DataModel\Behaviour;
+
+defined('_JEXEC') || die;
+
+use FOF30\Event\Observer;
+use FOF30\Model\DataModel;
+use Joomla\CMS\Application\SiteApplication;
+use Joomla\CMS\Factory;
+use Joomla\Registry\Registry;
+
+/**
+ * FOF model behavior class to populate the state with the front-end page parameters
+ *
+ * @since    2.1
+ */
+class PageParametersToState extends Observer
+{
+	public function onAfterConstruct(DataModel &$model)
+	{
+		// This only applies to the front-end
+		if (!$model->getContainer()->platform->isFrontend())
+		{
+			return;
+		}
+
+		// Get the page parameters
+		/** @var SiteApplication $app */
+		$app = Factory::getApplication();
+		/** @var Registry|Registry $params */
+		$params = $app->getParams();
+
+		// Extract the page parameter keys
+		$asArray = $params->toArray();
+
+		if (empty($asArray))
+		{
+			// There are no keys; no point in going on.
+			return;
+		}
+
+		$keys = array_keys($asArray);
+		unset($asArray);
+
+		// Loop all page parameter keys
+		foreach ($keys as $key)
+		{
+			// This is the current model state
+			$currentState = $model->getState($key);
+			// This is the explicitly requested state in the input
+			$explicitInput = $model->input->get($key, null, 'raw');
+
+			// If the current state is empty and there's no explicit input we'll use the page parameters instead
+			if (is_null($currentState) && is_null($explicitInput))
+			{
+				$model->setState($key, $params->get($key));
+			}
+		}
+	}
+}