Fixes #145: Added the ability to customize the class used to draw dropdowns in `yii\bootstrap\Nav`, `yii\bootstrapButtonDropdown` and `yii\bootstrap\Tab` widgets

ButtonDropdown.php

@@ -67,6 +67,11 @@ class ButtonDropdown extends Widget
      * @var boolean whether the label should be HTML-encoded.
      */
     public $encodeLabel = true;
+	/**
+	 * @var string name of a class to use for rendering dropdowns withing this widget. Defaults to [[Dropdown]].
+	 * @since 2.0.7
+	 */
+	public $dropdownClass = 'yii\bootstrap\Dropdown';
 
 
     /**
@@ -139,7 +144,8 @@ class ButtonDropdown extends Widget
         $config = $this->dropdown;
         $config['clientOptions'] = false;
         $config['view'] = $this->getView();
-
+		/** @var Widget $dropdownClass */
-        return Dropdown::widget($config);
+		$dropdownClass = $this->dropdownClass;
+		return $dropdownClass::widget($config);
     }
 }

CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 bootstrap extension Change Log
 2.0.7 under development
 -----------------------
 
+- Enh #145: Added the ability to customize the class used to draw dropdowns in `yii\bootstrap\Nav`, `yii\bootstrapButtonDropdown` and `yii\bootstrap\Tab` widgets (PowerGamer1)
 - Bug #126: `yii\bootstrap\ToggleButtonGroup` was unable to work without model (makroxyz)
 - Bug #130: Fixed `yii\bootstrap\Collapse` to use pure numerical value on `content` property (meysampg)
 - Bug #137: Remove `role="navbar"` from `yii\bootstrap\NavBar` according to new aria specification (tino415)

Nav.php

@@ -105,6 +105,11 @@ class Nav extends Widget
      * Defaults to `null` which means `<b class="caret"></b>` will be used. To disable the caret, set this property to be an empty string.
      */
     public $dropDownCaret;
+    /**
+     * @var string name of a class to use for rendering dropdowns withing this widget. Defaults to [[Dropdown]].
+	 * @since 2.0.7
+     */
+	public $dropdownClass = 'yii\bootstrap\Dropdown';
 
 
     /**
@@ -211,7 +216,9 @@ class Nav extends Widget
      */
     protected function renderDropdown($items, $parentItem)
     {
-        return Dropdown::widget([
+		/** @var Widget $dropdownClass */
+		$dropdownClass = $this->dropdownClass;
+		return $dropdownClass::widget([
             'options' => ArrayHelper::getValue($parentItem, 'dropDownOptions', []),
             'items' => $items,
             'encodeLabels' => $this->encodeLabels,

Tabs.php

@@ -118,6 +118,11 @@ class Tabs extends Widget
      * @since 2.0.1
      */
     public $renderTabContent = true;
+	/**
+	 * @var string name of a class to use for rendering dropdowns withing this widget. Defaults to [[Dropdown]].
+	 * @since 2.0.7
+	 */
+	public $dropdownClass = 'yii\bootstrap\Dropdown';
 
 
     /**
@@ -176,8 +181,10 @@ class Tabs extends Widget
                 if (!isset($linkOptions['data-toggle'])) {
                     $linkOptions['data-toggle'] = 'dropdown';
                 }
+				/** @var Widget $dropdownClass */
+				$dropdownClass = $this->dropdownClass;
                 $header = Html::a($label, "#", $linkOptions) . "\n"
-                    . Dropdown::widget(['items' => $item['items'], 'clientOptions' => false, 'view' => $this->getView()]);
+                    . $dropdownClass::widget(['items' => $item['items'], 'clientOptions' => false, 'view' => $this->getView()]);
             } else {
                 $options = array_merge($this->itemOptions, ArrayHelper::getValue($item, 'options', []));
                 $options['id'] = ArrayHelper::getValue($options, 'id', $this->options['id'] . '-tab' . $n);