Enh #4216: Added humhub\modules\ui\filter\widgets\DropdownFilterInput in order to support dropdown stream filters

protected/humhub/docs/CHANGELOG_DEV.md

@@ -17,3 +17,4 @@ HumHub Change Log
 - Enh: Added `humhub\modules\ui\form\widgets\ActiveField:preventRendering` to manage render state within field classes
 - Enh: Added `humhub\modules\ui\form\widgets\JsInputWidget:emptyResult()` helper to manage render state of JsInputWidget
 - Enh: Added `humhub\modules\ui\form\widgets\JsInputWidget:field` in order to access ActiveField instances within JsInputWidget
+- Enh #4216: Added `humhub\modules\ui\filter\widgets\DropdownFilterInput` in order to support dropdown stream filters

protected/humhub/modules/ui/filter/resources/js/humhub.ui.filter.js

@@ -156,6 +156,7 @@ humhub.module('ui.filter', function(module, require, $) {
         'checkbox': CheckBoxInput,
         'radio': RadioInput,
         'picker': PickerInput,
+        'dropdown': TextInput, // don't need a custom input type here
         'text': TextInput
     };
 

protected/humhub/modules/ui/filter/widgets/DropdownFilterInput.php

@@ -0,0 +1,61 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: kingb
+ * Date: 05.10.2018
+ * Time: 21:14
+ */
+
+namespace humhub\modules\ui\filter\widgets;
+
+use humhub\modules\ui\filter\widgets\FilterInput;
+use humhub\libs\Html;
+
+/**
+ * Dropdown stream filter input type.
+ *
+ * @package humhub\modules\ui\filter\widgets
+ */
+class DropdownFilterInput extends FilterInput
+{
+    /**
+     * @inheritdoc
+     */
+    public $view = 'dropdownInput';
+
+    /**
+     * @inheritdoc
+     */
+    public $type = 'dropdown';
+
+    /**
+     * @var array dropdown selection
+     */
+    public $selection = [];
+
+    /**
+     * @var array dropdown items
+     */
+    public $items = [];
+
+    /**
+     * @inheritdoc
+     */
+    public function prepareOptions()
+    {
+        parent::prepareOptions();
+        $this->options['data-action-change'] = 'inputChange';
+        Html::addCssClass($this->options, 'form-control');
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function getWidgetOptions()
+    {
+        return array_merge(parent::getWidgetOptions(), [
+            'selection' => $this->selection,
+            'items' => $this->items
+        ]);
+    }
+}

protected/humhub/modules/ui/filter/widgets/views/dropdownInput.php

@@ -0,0 +1,18 @@
+<?php
+/**
+ * @link https://www.humhub.org/
+ * @copyright Copyright (c) 2018 HumHub GmbH & Co. KG
+ * @license https://www.humhub.com/licences
+ *
+ */
+
+use yii\bootstrap\Html;
+
+/* @var $this \humhub\components\View */
+/* @var $options [] */
+/* @var $selection [] */
+/* @var $items [] */
+?>
+<div class="form-group">
+    <?= Html::dropDownList(null, $selection, $items, $options) ?>
+</div>