Add configuration form for theming options

refs #10705

application/forms/Config/General/ThemingConfigForm.php

@@ -0,0 +1,72 @@
+<?php
+/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Config\General;
+
+use Icinga\Application\Icinga;
+use Icinga\Application\Logger;
+use Icinga\Web\Form;
+
+/**
+ * Configuration form for theming options
+ *
+ * This form is not used directly but as subform for the {@link GeneralConfigForm}.
+ */
+class ThemingConfigForm extends Form
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setName('form_config_general_theming');
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return  $this
+     */
+    public function createElements(array $formData)
+    {
+        $this->addElement(
+            'select',
+            'themes_default',
+            array(
+                'description'   => $this->translate('The default theme', 'Form element description'),
+                'label'         => $this->translate('Default Theme', 'Form element label'),
+                'multiOptions'  => Icinga::app()->getThemes()
+            )
+        );
+
+        $this->addElement(
+            'checkbox',
+            'themes_disabled',
+            array(
+                'description'   => $this->translate(
+                    'Check this box for disallowing users to change the theme. If a default theme is set, it will be'
+                    . ' used nonetheless',
+                    'Form element description'
+                ),
+                'label'         => $this->translate('Disable Themes', 'Form element label')
+            )
+        );
+
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValues($suppressArrayNotation = false)
+    {
+        $values = parent::getValues($suppressArrayNotation);
+        if ($values['themes_default'] === 'Icinga') {
+            $values['themes_default'] = null;
+        }
+        if (! $values['themes_disabled']) {
+            $values['themes_disabled'] = null;
+        }
+        return $values;
+    }
+}