walker.php

<?php

class BulmaWalker extends \Walker_Nav_Menu
{
  
       	/**
		 * [private stored in start_el and used in start_lvl to pass custom classes on ]
		 * @var [array]
		 */
		private $right_class;
    /**
     * Start Level.
     *
     * @see Walker::start_lvl()
     * @since 1.0.0
     *
     * @access public
     *
     * @param mixed $output Passed by reference. Used to append additional content.
     * @param int $depth (default: 0) Depth of page. Used for padding.
     * @param array $args (default: array()) Arguments.
     *
     * @return void
     */

		public function start_lvl( &$output, $depth = 0, $args = array() ) {
			$indent = str_repeat( "\t", $depth );
				$output .= $indent."<div class=\"navbar-dropdown is-boxed";
				if( in_array( 'is-right', $this->right_class ) ){
						$output .= " is-right ";
					}
				$output .= "\">";
		}

		public function end_lvl( &$output, $depth = 0, $args = array() ) {
			$indent = str_repeat( "\t", $depth );
			$output .= "$indent</div><!-- END LEVEL -->\n";
		}

    /**
		 * Start El.
		 *
		 * @see Walker::start_el()
		 * @since 1.0.0
		 *
		 * @access public
		 *
		 * @param mixed $output Passed by reference. Used to append additional content.
		 * @param mixed $item Menu item data object.
		 * @param int $depth (default: 0) Depth of menu item. Used for padding.
		 * @param array $args (default: array()) Arguments.
		 * @param int $id (default: 0) Menu item ID.
		 *
		 * @return void
		 */
		public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
			$defaults = array(
				'menu'            => '',
				'container'       => 'div',
				'container_class' => '',
				'container_id'    => '',
				'menu_class'      => 'menu',
				'menu_id'         => '',
				'echo'            => true,
				'fallback_cb'     => 'wp_page_menu',
				'before'          => '',
				'after'           => '',
				'link_before'     => '',
				'link_after'      => '',
				'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s</ul>',
				'item_spacing'    => 'preserve',
				'depth'           => 0,
				'walker'          => '',
				'theme_location'  => '',
			);
			$args     	 = wp_parse_args( $args, $defaults );

			$indent      = ( $depth ) ? str_repeat( "\t", $depth ) : '';
			$class_names = $this->get_item_classes( $item, $args );
			$id          = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args );
			$id          = $id ? ' id="' . esc_attr( $id ) . '"' : '';
			$attributes  = $this->get_item_attributes( $item, $args );

			$show_title_class = 'fa-show-title';
			// we're going to show the title of the link by default
			$show_title = true;
			//Pattern for working out how to find font awesome classes
			$pattern = '/(fa-.*|^fas|^fab)/m';
			//First find the classes and assign them to a new variable
			$fa = preg_grep($pattern, $item->classes);
			//Create string of font awesome classes
			$fa = implode(" ",$fa);
			//Look for fa-show-title class
			$the_title = strstr($fa, $show_title_class);
			///Remove class fa-show-title
			$fa = str_replace($show_title_class,"",$fa);
			//Remove font awesome and is-right classes from navbar-item string
			$class_names = str_replace(array($fa,$show_title_class,"is-right"),"",$class_names);
			$classes = empty( $item->classes ) ? array() : (array) $item->classes;
			$this->right_class = $classes;

			if ( ! $args['has_children'] ) {//if doesn't have children
						if ( ! in_array( 'navbar-divider', $classes ) ) {//if doesnt contains a navbar divider
							$item_output = $args['before'];//start outputting
							if ( ! empty( $fa ) ) {//if item title is not empty
										$item_output .= '<a' . $class_names . $attributes . '><i class="' . $fa . '"></i>';
										if (is_bool($the_title)) {
													$show_title = false;//don't display text
										}
							}
							else{
								$item_output .= '<a' . $class_names . $attributes . '>';//item empty use defaults
							}
						$link_title = $show_title ? apply_filters( 'the_title', $item->title, $item->ID ) : '';
						$item_output .= $args['link_before'] . trim($link_title). $args['link_after'];
						$item_output .= $args['after'];
					}
					else {
						$item_output = '<hr class="navbar-divider">';//output navbar divider
					}
				$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
			}

			else {//if does have children
				$item_output = $args['before'];//stat outputting
				$item_output .= $indent . '<div class="navbar-item has-dropdown is-hoverable" data-target="dropdown"><!-- START DROPDOWN-->' . "\n";
					if ( ! empty( $fa ) ) {//if fa  is not empty
						$item_output .= '<a' . $class_names . $attributes . '><i class="' . $fa . '"></i>';

							if (is_bool($the_title)) {
										$show_title = false;//don't display text
							}
					}
					else{
						$item_output .= '<a' . $class_names . $attributes . $id . '>';//output standard
					}

				$link_title = $show_title ? apply_filters( 'the_title', $item->title, $item->ID ) : '';//if show title is true hook in the title or leave blank
				$item_output .= $args['link_before'] .trim($link_title) . $args['link_after'];//remove link
				$item_output .= $args['after'];
				$item_output .= '</a>';
				$output      .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
			}

		}

		public function end_el( &$output, $item, $depth = 0, $args = array() ) {
			if ( ! in_array( 'menu-item-has-children', $item->classes ) ) {
				$output .= "</a>\n";
			} else {
				$output .= "</div><!-- END DROPDOWN-->\n";
			}
		}

    /**
		 * 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 1.0.0
		 *
		 * @access public
		 *
		 * @param mixed $element Data object.
		 * @param mixed $children_elements List of elements to continue traversing.
		 * @param mixed $max_depth Max depth to traverse.
		 * @param mixed $depth Depth of current element.
		 * @param mixed $args Arguments.
		 * @param mixed $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 );
		}

		private function get_item_classes( $item, $args ) {
			$classes     = empty( $item->classes ) ? array() : (array) $item->classes;
			$classes[]   = 'menu-item-' . $item->ID;
			$classes[]   = 'navbar-item';
			$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
			if ( $args['has_children'] ) {
				$class_names .= ' dropdown navbar-link';
			}
			if ( in_array( 'current-menu-item', $classes, true ) ) {
				$class_names .= ' is-active';
			}

			return $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
		}

		private function get_item_attributes( $item, $args ) {
			$atts = array();
			if ( empty( $item->attr_title ) ) {
				$atts['title'] = ! empty( $item->title ) ? strip_tags( $item->title ) : '';
			}
			$atts['target'] = ! empty( $item->target ) ? $item->target : '';
			$atts['rel']    = ! empty( $item->xfn ) ? $item->xfn : '';
			$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 . '"';
				}
			}

			return $attributes;
		}
    /**
     * Menu Fallback
     * =============
     * If this function is assigned to the wp_nav_menu's fallback_cb variable
     * and a menu 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( 'edit_theme_options' ) ) {
				/* Get Arguments. */
				$container       = $args['container'];
				$container_id    = $args['container_id'];
				$container_class = $args['container_class'];
				$menu_class      = $args['menu_class'];
				$menu_id         = $args['menu_id'];
				if ( $container ) {
					echo '<' . esc_attr( $container );
					if ( $container_id ) {
						echo ' id="' . esc_attr( $container_id ) . '"';
					}
					if ( $container_class ) {
						echo ' class="' . sanitize_html_class( $container_class ) . '"';
					}
					echo '>';
				}
				echo '<div';
				if ( $menu_id ) {
					echo ' id="' . esc_attr( $menu_id ) . '"';
				}
				if ( $menu_class ) {
					echo ' class="' . esc_attr( $menu_class ) . '"';
				}
				echo '>';
				echo '<a class="navbar-item" href="' . esc_url( admin_url( 'nav-menus.php' ) ) . '" title="">' . esc_attr( 'Add a menu', 'worldoweb' ) . '</a>';
				echo '</div>';
				if ( $container ) {
					echo '</' . esc_attr( $container ) . '>';
				}
			}
		}
}