first commit

administrator/src/Field/NestedparentField.php

@@ -0,0 +1,83 @@
+<?php
+/**
+ * @version    CVS: 1.0.0
+ * @package    Com_Circolari
+ * @author     Tommaso Cippitelli <tommaso.cippitelli@protocollicreativi.it>
+ * @copyright  2025 Tommaso Cippitelli
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Pcrt\Component\Circolari\Administrator\Field;
+
+defined('JPATH_BASE') or die;
+
+use Joomla\CMS\Helper\UserGroupsHelper;
+use \Joomla\CMS\Factory;
+use Joomla\CMS\Form\Field\ListField;
+
+/**
+ * Supports an HTML select list of categories
+ *
+ * @since  1.0.0
+ */
+class NestedparentField extends ListField
+{
+	/**
+	 * The form field type.
+	 *
+	 * @var    string
+	 * @since  1.0.0
+	 */
+	protected $type = 'nestedparent';
+
+	/**
+	 * Method to get the field options.
+	 *
+	 * @return  array  The field option objects.
+	 *
+	 * @since   1.0.0
+	 */
+	protected function getOptions()
+	{
+		$options = array();
+		$table   = $this->getAttribute('table');
+
+		$db = Factory::getContainer()->get('DatabaseDriver');
+		$query = $db->getQuery(true)
+			->select('DISTINCT(a.id) AS value, a.title AS text, a.level, a.lft')
+			->from($table . ' AS a');
+
+
+		// Prevent parenting to children of this item.
+		if ($id = $this->form->getValue('id'))
+		{
+			$query->join('LEFT', $db->quoteName($table) . ' AS p ON p.id = ' . (int) $id)
+				->where('NOT(a.lft >= p.lft AND a.rgt <= p.rgt)');
+		}
+
+		$query->order('a.lft ASC');
+
+		// Get the options.
+		$db->setQuery($query);
+
+		try
+		{
+			$options = $db->loadObjectList();
+		}
+		catch (\RuntimeException $e)
+		{
+			throw new \Exception($e->getMessage(), 500);
+		}
+
+		// Pad the option text with spaces using depth level as a multiplier.
+		for ($i = 0, $n = count($options); $i < $n; $i++)
+		{
+				$options[$i]->text = str_repeat('- ', $options[$i]->level) . $options[$i]->text;
+		}
+
+		// Merge any additional options in the XML definition.
+		$options = array_merge(parent::getOptions(), $options);
+
+		return $options;
+	}
+}