Added dropdown widget

framework/yii/bootstrap/Dropdown.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\bootstrap;
+
+use yii\base\InvalidConfigException;
+use yii\helpers\base\ArrayHelper;
+use yii\helpers\Html;
+
+
+/**
+ * Dropdown renders a Tab bootstrap javascript component.
+ *
+ * @see http://twitter.github.io/bootstrap/javascript.html#dropdowns
+ * @author Antonio Ramirez <amigo.cobos@gmail.com>
+ * @since 2.0
+ */
+class Dropdown extends Widget
+{
+	/**
+	 * @var array list of menu items in the dropdown. Each array element represents a single
+	 * menu with the following structure:
+	 *
+	 * ```php
+	 * array(
+	 *     // required, the label of the item link
+	 *     'label' => 'Menu label',
+	 *     // optional, url of the item link
+	 *     'url' => '',
+	 *     // optional the HTML attributes of the item link
+	 *     'urlOptions'=> array(...),
+	 *     // optional the HTML attributes of the item
+	 *     'options'=> array(...),
+	 *     // optional, an array of items that configure a sub menu of the item
+	 *     // note: if `items` is set, then `url` of the parent item will be ignored and automatically set to "#"
+	 *     'items'=> array(...)
+	 * )
+	 * ```
+	 * If you wish to display a `divider`, use any string. The widget will render a bootstrap dropdown divider:
+	 *
+	 * ```html
+	 * <li class="divider"></li>
+	 * ```
+	 */
+	public $items = array();
+
+
+	/**
+	 * Initializes the widget.
+	 * If you override this method, make sure you call the parent implementation first.
+	 */
+	public function init()
+	{
+		parent::init();
+		$this->addCssClass($this->options, 'dropdown-menu');
+	}
+
+	/**
+	 * Renders the widget.
+	 */
+	public function run()
+	{
+		echo Html::beginTag('ul', $this->options) . "\n";
+		echo $this->renderContents() . "\n";
+		echo Html::endTag('ul') . "\n";
+		$this->registerPlugin('dropdown');
+	}
+
+	/**
+	 * Renders dropdown contents as specified on [[items]].
+	 * @return string the rendering result.
+	 * @throws InvalidConfigException
+	 */
+	protected function renderContents()
+	{
+		$contents = array();
+		foreach ($this->items as $item) {
+			if (is_string($item)) {
+				$contents[] = Html::tag('li', '', array('class' => 'divider'));
+				continue;
+			}
+			if (!isset($item['label'])) {
+				throw new InvalidConfigException("The 'label' option is required.");
+			}
+
+			$options = ArrayHelper::getValue($item, 'options', array());
+			$urlOptions = ArrayHelper::getValue($item, 'urlOptions', array());
+			$urlOptions['tabindex'] = '-1';
+
+			if (isset($item['items'])) {
+				$this->addCssClass($options, 'dropdown-submenu');
+				$content = Html::a($item['label'], '#', $urlOptions) . $this->dropdown($item['items']);
+			} else {
+				$content = Html::a($item['label'], ArrayHelper::getValue($item, 'url', '#'), $urlOptions);
+			}
+			$contents[] = Html::tag('li', $content , $options);
+		}
+
+		return implode("\n", $contents);
+	}
+
+	/**
+	 * Generates a dropdown menu.
+	 * @param array $items the configuration of the dropdown items. See [[items]].
+	 * @return string the generated dropdown menu
+	 * @see items
+	 */
+	protected function dropdown($items)
+	{
+		return Dropdown::widget(array('items' => $items, 'clientOptions' => false));
+	}
+}
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