added config for initial calendar view (#363)

src/Form/Type/CalendarViewType.php

@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Form\Type;
+
+use Symfony\Component\Form\AbstractType;
+use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
+use Symfony\Component\OptionsResolver\OptionsResolver;
+
+/**
+ * Custom form field type to select a calendar view.
+ */
+class CalendarViewType extends AbstractType
+{
+    public const DEFAULT_VIEW = 'month';
+
+    public const ALLOWED_VIEWS = [
+        'month',
+        'agendaWeek',
+        'agendaDay',
+    ];
+
+    /**
+     * {@inheritdoc}
+     */
+    public function configureOptions(OptionsResolver $resolver)
+    {
+        $choices = [];
+        foreach (self::ALLOWED_VIEWS as $name) {
+            $choices[$name] = $name;
+        }
+
+        $resolver->setDefaults([
+            'required' => true,
+            'choices' => $choices,
+        ]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getParent()
+    {
+        return ChoiceType::class;
+    }
+}