Introduce form class MenuItemForm

refs #5600

application/forms/Navigation/MenuItemForm.php

@@ -0,0 +1,32 @@
+<?php
+/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Navigation;
+
+class MenuItemForm extends NavigationItemForm
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function createElements(array $formData)
+    {
+        $availableParents = $this->getParent()->listAvailableParents('menu-item');
+        $this->addElement(
+            'select',
+            'parent',
+            array(
+                'allowEmpty'    => true,
+                'label'         => $this->translate('Parent'),
+                'description'   => $this->translate(
+                    'The parent menu to assign this menu entry to. Select "None" to make this a main menu entry'
+                ),
+                'multiOptions'  => array_merge(
+                    array('' => $this->translate('None', 'No parent for a navigation item')),
+                    empty($availableParents) ? array() : array_combine($availableParents, $availableParents)
+                )
+            )
+        );
+
+        parent::createElements($formData);
+    }
+}