Added NavBar widget closes #437

framework/yii/bootstrap/NavBar.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;
+
+/**
+ * NavBar renders a navbar HTML component.
+ *
+ * For example:
+ *
+ * ```php
+ * echo NavBar::widget(array(
+ *     'items' => array(
+ *         // a Nav widget
+ *         array(
+ *             // defaults to Nav anyway.
+ *             'class' => 'yii\bootstrap\Nav',
+ *             // widget configuration
+ *             'options' => array(
+ *                 'items' => array(
+ *                     array(
+ *                         'label' => 'Home',
+ *                         'url' => '/',
+ *                         'options' => array('class' => 'active'),
+ *                     ),
+ *                     array(
+ *                         'label' => 'Dropdown',
+ *                         // configure a dropdown menu
+ *                         'dropdown' => array(
+ *                             array(
+ *                                 'label' => 'DropdownA',
+ *                                 'url' => '#',
+ *                             ),
+ *                             array(
+ *                                 'label' => 'DropdownB',
+ *                                 'url' => '#'
+ *                             ),
+ *                         )
+ *                     ),
+ *                 )
+ *             ),
+ *         ),
+ *         // you can also use strings
+ *         '<form class="navbar-search pull-left" action="">' .
+ *         '<input type="text" class="search-query" placeholder="Search">' .
+ *         '</form>',
+ *     ),
+ * ));
+ * ```
+ *
+ * @see http://twitter.github.io/bootstrap/components.html#navbar
+ * @author Antonio Ramirez <amigo.cobos@gmail.com>
+ * @since 2.0
+ */
+class NavBar extends Widget
+{
+	public $brand;
+	/**
+	 * @var array list of menu items in the navbar widget. Each array element represents a single
+	 * menu item with the following structure:
+	 *
+	 * ```php
+	 * array(
+	 *     // optional, the menu item class type of the widget to render. Defaults to "Nav" widget.
+	 *     'class' => 'Menu item class type',
+	 *     // required, the configuration options of the widget.
+	 *     'options'=> array(...),
+	 * ),
+	 * // optionally, you can pass a string
+	 * '<form class="navbar-search pull-left" action="">' .
+	 * '<input type="text" class="search-query span2" placeholder="Search">' .
+	 * '</form>',
+	 * ```
+	 *
+	 * Optionally, you can also use a plain string instead of an array element.
+	 */
+	public $items = array();
+
+
+	/**
+	 * Initializes the widget.
+	 */
+	public function init()
+	{
+		parent::init();
+		$this->addCssClass($this->options, 'navbar');
+	}
+
+	/**
+	 * Renders the widget.
+	 */
+	public function run()
+	{
+		echo Html::beginTag('div', $this->options);
+		echo $this->renderItems();
+		echo Html::endTag('div');
+	}
+
+	/**
+	 * @return string the rendering items.
+	 */
+	protected function renderItems()
+	{
+		$items = array();
+
+		foreach ($this->items as $item) {
+			$items[] = $this->renderItem($item);
+		}
+		$contents =implode("\n", $items);
+		if (self::$responsive === true) {
+			$this->getView()->registerAssetBundle('yii/bootstrap/collapse');
+			$contents =
+				Html::tag('div',
+					$this->renderToggleButton() .
+					$this->brand . "\n" .
+					Html::tag('div', $contents, array('class' => 'nav-collapse collapse navbar-collapse')),
+					array('class' => 'container'));
+
+		} else {
+			$contents = $this->brand . "\n" . $contents;
+		}
+		return Html::tag('div', $contents, array('class' => 'navbar-inner'));
+	}
+
+	/**
+	 * Renders a item. The item can be a string, a custom class or a Nav widget (defaults if no class specified.
+	 * @param mixed $item the item to render. If array, it is assumed the configuration of a widget being `class`
+	 * required and if not specified, then defaults to `yii\bootstrap\Nav`.
+	 * @return string the rendering result.
+	 * @throws InvalidConfigException
+	 */
+	protected function renderItem($item)
+	{
+		if (is_string($item)) {
+			return $item;
+		}
+		$config = ArrayHelper::getValue($item, 'options', array());
+		$config['class'] = ArrayHelper::getValue($item, 'class', 'yii\bootstrap\Nav');
+		$widget = \Yii::createObject($config);
+		ob_start();
+		$widget->run();
+		return ob_get_clean();
+	}
+
+	/**
+	 * Renders collapsible toggle button.
+	 * @return string the rendering toggle button.
+	 */
+	protected function renderToggleButton()
+	{
+		$items = array();
+		for ($i = 0; $i < 3; $i++) {
+			$items[] = Html::tag('span', '', array('class' => 'icon-bar'));
+		}
+		return Html::tag('a', implode("\n", $items), array(
+			'class' => 'btn btn-navbar',
+			'data-toggle' => 'collapse',
+			'data-target' => 'div.navbar-collapse',
+		)) . "\n";
+	}
+}
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