ListView user filter

wcfsetup/install/files/lib/system/listView/filter/UserFilter.class.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace wcf\system\listView\filter;
+
+use wcf\data\DatabaseObjectList;
+use wcf\system\cache\runtime\UserRuntimeCache;
+use wcf\system\form\builder\field\AbstractFormField;
+use wcf\system\form\builder\field\user\UserFormField;
+
+/**
+ * Filter for columns that contain user ids.
+ *
+ * @author Olaf Braun
+ * @copyright 2001-2025 WoltLab GmbH
+ * @license GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
+ * @since 6.2
+ */
+class UserFilter extends AbstractFilter
+{
+    #[\Override]
+    public function getFormField(): AbstractFormField
+    {
+        return UserFormField::create($this->id)
+            ->label($this->languageItem)
+            ->nullable();
+    }
+
+    #[\Override]
+    public function applyFilter(DatabaseObjectList $list, string $value): void
+    {
+        $columnName = $this->getDatabaseColumnName($list);
+
+        $list->getConditionBuilder()->add("{$columnName} = ?", [$value]);
+    }
+
+    #[\Override]
+    public function renderValue(string $value): string
+    {
+        $user = UserRuntimeCache::getInstance()->getObject((int)$value);
+
+        return $user ? $user->username : '';
+    }
+}