From fbb7805305a13bfda25e4afa48eb6dc69e0541c2 Mon Sep 17 00:00:00 2001
From: WalterBrake <walter_palacios_mac@hotmail.com>
Date: Tue, 17 May 2016 14:38:58 -0500
Subject: [PATCH] add wp_bootstrap_navwalker

---
 wp_bootstrap_navwalker.php | 206 +++++++++++++++++++++++++++++++++++++
 1 file changed, 206 insertions(+)
 create mode 100644 wp_bootstrap_navwalker.php

diff --git a/wp_bootstrap_navwalker.php b/wp_bootstrap_navwalker.php
new file mode 100644
index 0000000..8dabc00
--- /dev/null
+++ b/wp_bootstrap_navwalker.php
@@ -0,0 +1,206 @@
+<?php
+
+/**
+ * Class Name: wp_bootstrap_navwalker
+ * GitHub URI: https://github.com/twittem/wp-bootstrap-navwalker
+ * Description: A custom WordPress nav walker class to implement the Bootstrap 3 navigation style in a custom theme using the WordPress built in menu manager.
+ * Version: 2.0.4
+ * Author: Edward McIntyre - @twittem
+ * License: GPL-2.0+
+ * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
+ */
+
+class wp_bootstrap_navwalker extends Walker_Nav_Menu {
+
+	/**
+	 * @see Walker::start_lvl()
+	 * @since 3.0.0
+	 *
+	 * @param string $output Passed by reference. Used to append additional content.
+	 * @param int $depth Depth of page. Used for padding.
+	 */
+	public function start_lvl( &$output, $depth = 0, $args = array() ) {
+		$indent = str_repeat( "\t", $depth );
+		$output .= "\n$indent<ul role=\"menu\" class=\" dropdown-menu\">\n";
+	}
+
+	/**
+	 * @see Walker::start_el()
+	 * @since 3.0.0
+	 *
+	 * @param string $output Passed by reference. Used to append additional content.
+	 * @param object $item Menu item data object.
+	 * @param int $depth Depth of menu item. Used for padding.
+	 * @param int $current_page Menu item ID.
+	 * @param object $args
+	 */
+	public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
+		$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
+
+		/**
+		 * Dividers, Headers or Disabled
+		 * =============================
+		 * Determine whether the item is a Divider, Header, Disabled or regular
+		 * menu item. To prevent errors we use the strcasecmp() function to so a
+		 * comparison that is not case sensitive. The strcasecmp() function returns
+		 * a 0 if the strings are equal.
+		 */
+		if ( strcasecmp( $item->attr_title, 'divider' ) == 0 && $depth === 1 ) {
+			$output .= $indent . '<li role="presentation" class="divider">';
+		} else if ( strcasecmp( $item->title, 'divider') == 0 && $depth === 1 ) {
+			$output .= $indent . '<li role="presentation" class="divider">';
+		} else if ( strcasecmp( $item->attr_title, 'dropdown-header') == 0 && $depth === 1 ) {
+			$output .= $indent . '<li role="presentation" class="dropdown-header">' . esc_attr( $item->title );
+		} else if ( strcasecmp($item->attr_title, 'disabled' ) == 0 ) {
+			$output .= $indent . '<li role="presentation" class="disabled"><a href="#">' . esc_attr( $item->title ) . '</a>';
+		} else {
+
+			$class_names = $value = '';
+
+			$classes = empty( $item->classes ) ? array() : (array) $item->classes;
+			$classes[] = 'menu-item-' . $item->ID;
+
+			$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
+
+			if ( $args->has_children )
+				$class_names .= ' dropdown';
+
+			if ( in_array( 'current-menu-item', $classes ) )
+				$class_names .= ' active';
+
+			$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
+
+			$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
+			$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
+
+			$output .= $indent . '<li' . $id . $value . $class_names .'>';
+
+			$atts = array();
+			$atts['title']  = ! empty( $item->title )	? $item->title	: '';
+			$atts['target'] = ! empty( $item->target )	? $item->target	: '';
+			$atts['rel']    = ! empty( $item->xfn )		? $item->xfn	: '';
+
+			// If item has_children add atts to a.
+			if ( $args->has_children && $depth === 0 ) {
+				$atts['href']   		= '#';
+				$atts['data-toggle']	= 'dropdown';
+				$atts['class']			= 'dropdown-toggle';
+				$atts['aria-haspopup']	= 'true';
+			} else {
+				$atts['href'] = ! empty( $item->url ) ? $item->url : '';
+			}
+
+			$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args );
+
+			$attributes = '';
+			foreach ( $atts as $attr => $value ) {
+				if ( ! empty( $value ) ) {
+					$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
+					$attributes .= ' ' . $attr . '="' . $value . '"';
+				}
+			}
+
+			$item_output = $args->before;
+
+			/*
+			 * Glyphicons
+			 * ===========
+			 * Since the the menu item is NOT a Divider or Header we check the see
+			 * if there is a value in the attr_title property. If the attr_title
+			 * property is NOT null we apply it as the class name for the glyphicon.
+			 */
+			if ( ! empty( $item->attr_title ) )
+				$item_output .= '<a'. $attributes .'><span class="glyphicon ' . esc_attr( $item->attr_title ) . '"></span>&nbsp;';
+			else
+				$item_output .= '<a'. $attributes .'>';
+
+			$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
+			$item_output .= ( $args->has_children && 0 === $depth ) ? ' <span class="caret"></span></a>' : '</a>';
+			$item_output .= $args->after;
+
+			$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
+		}
+	}
+
+	/**
+	 * Traverse elements to create list from elements.
+	 *
+	 * Display one element if the element doesn't have any children otherwise,
+	 * display the element and its children. Will only traverse up to the max
+	 * depth and no ignore elements under that depth.
+	 *
+	 * This method shouldn't be called directly, use the walk() method instead.
+	 *
+	 * @see Walker::start_el()
+	 * @since 2.5.0
+	 *
+	 * @param object $element Data object
+	 * @param array $children_elements List of elements to continue traversing.
+	 * @param int $max_depth Max depth to traverse.
+	 * @param int $depth Depth of current element.
+	 * @param array $args
+	 * @param string $output Passed by reference. Used to append additional content.
+	 * @return null Null on failure with no changes to parameters.
+	 */
+	public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
+        if ( ! $element )
+            return;
+
+        $id_field = $this->db_fields['id'];
+
+        // Display this element.
+        if ( is_object( $args[0] ) )
+           $args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] );
+
+        parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
+    }
+
+	/**
+	 * Menu Fallback
+	 * =============
+	 * If this function is assigned to the wp_nav_menu's fallback_cb variable
+	 * and a manu has not been assigned to the theme location in the WordPress
+	 * menu manager the function with display nothing to a non-logged in user,
+	 * and will add a link to the WordPress menu manager if logged in as an admin.
+	 *
+	 * @param array $args passed from the wp_nav_menu function.
+	 *
+	 */
+	public static function fallback( $args ) {
+		if ( current_user_can( 'manage_options' ) ) {
+
+			extract( $args );
+
+			$fb_output = null;
+
+			if ( $container ) {
+				$fb_output = '<' . $container;
+
+				if ( $container_id )
+					$fb_output .= ' id="' . $container_id . '"';
+
+				if ( $container_class )
+					$fb_output .= ' class="' . $container_class . '"';
+
+				$fb_output .= '>';
+			}
+
+			$fb_output .= '<ul';
+
+			if ( $menu_id )
+				$fb_output .= ' id="' . $menu_id . '"';
+
+			if ( $menu_class )
+				$fb_output .= ' class="' . $menu_class . '"';
+
+			$fb_output .= '>';
+			$fb_output .= '<li><a href="' . admin_url( 'nav-menus.php' ) . '">Add a menu</a></li>';
+			$fb_output .= '</ul>';
+
+			if ( $container )
+				$fb_output .= '</' . $container . '>';
+
+			echo $fb_output;
+		}
+	}
+}