217 lines
8.0 KiB
PHP
217 lines
8.0 KiB
PHP
<?php
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/**
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* Adapted from Edward McIntyre's wp_bootstrap_navwalker class.
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* Removed support for glyphicon and added support for Font Awesome.
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*
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* @package understrap
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*/
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// Exit if accessed directly.
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if ( ! defined( 'ABSPATH' ) ) {
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exit;
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}
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if (! class_exists ( 'understrap_WP_Bootstrap_Navwalker' )) :
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/**
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* Class WP_Bootstrap_Navwalker
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* GitHub URI: https://github.com/twittem/wp-bootstrap-navwalker
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* Description: A custom WordPress nav walker class to implement the Bootstrap 4
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* navigation style in a custom theme using the WordPress built in menu manager.
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* Version: 2.0.4
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* Author: Edward McIntyre - @twittem
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* License: GPL-2.0+
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* License URI: http://www.gnu.org/licenses/gpl-2.0.txt
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*/
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class understrap_WP_Bootstrap_Navwalker extends Walker_Nav_Menu {
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/**
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* The starting level of the menu.
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*
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* @see Walker::start_lvl()
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* @since 3.0.0
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*
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* @param string $output Passed by reference. Used to append additional content.
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* @param int $depth Depth of page. Used for padding.
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* @param mixed $args Rest of arguments.
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*/
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public function start_lvl( &$output, $depth = 0, $args = array() ) {
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$indent = str_repeat( "\t", $depth );
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$output .= "\n$indent<ul class=\" dropdown-menu\" role=\"menu\">\n";
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}
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/**
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* Open element.
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*
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* @see Walker::start_el()
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* @since 3.0.0
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*
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* @param string $output Passed by reference. Used to append additional content.
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* @param object $item Menu item data object.
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* @param int $depth Depth of menu item. Used for padding.
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* @param mixed $args Rest arguments.
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* @param int $id Element's ID.
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*/
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public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
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$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
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/**
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* Dividers, Headers or Disabled
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* =============================
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* Determine whether the item is a Divider, Header, Disabled or regular
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* menu item. To prevent errors we use the strcasecmp() function to so a
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* comparison that is not case sensitive. The strcasecmp() function returns
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* a 0 if the strings are equal.
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*/
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if ( strcasecmp( $item->attr_title, 'divider' ) == 0 && $depth === 1 ) {
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$output .= $indent . '<li class="divider" role="presentation">';
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} else if ( strcasecmp( $item->title, 'divider' ) == 0 && $depth === 1 ) {
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$output .= $indent . '<li class="divider" role="presentation">';
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} else if ( strcasecmp( $item->attr_title, 'dropdown-header' ) == 0 && $depth === 1 ) {
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$output .= $indent . '<li class="dropdown-header" role="presentation">' . esc_html( $item->title );
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} else if ( strcasecmp( $item->attr_title, 'disabled' ) == 0 ) {
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$output .= $indent . '<li class="disabled" role="presentation"><a href="#">' . esc_html( $item->title ) . '</a>';
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} else {
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$class_names = $value = '';
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$classes = empty( $item->classes ) ? array() : (array) $item->classes;
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$classes[] = 'nav-item menu-item-' . $item->ID;
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$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
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/*
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if ( $args->has_children )
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$class_names .= ' dropdown';
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*/
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if ( $args->has_children && $depth === 0 ) {
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$class_names .= ' dropdown';
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} elseif ( $args->has_children && $depth > 0 ) {
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$class_names .= ' dropdown-submenu';
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}
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if ( in_array( 'current-menu-item', $classes ) ) {
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$class_names .= ' active';
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}
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// remove Font Awesome icon from classes array and save the icon
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// we will add the icon back in via a <span> below so it aligns with
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// the menu item
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if ( in_array( 'fa', $classes ) ) {
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$key = array_search( 'fa', $classes );
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$icon = $classes[ $key + 1 ];
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$class_names = str_replace( $classes[ $key + 1 ], '', $class_names );
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$class_names = str_replace( $classes[ $key ], '', $class_names );
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}
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$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
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$id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args );
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$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
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$output .= $indent . '<li' . $id . $value . $class_names . '>';
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$atts = array();
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if ( empty( $item->attr_title ) ) { $atts['title'] = ! empty( $item->title ) ? strip_tags( $item->title ) : ''; } else { $atts['title'] = $item->attr_title; }
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$atts['target'] = ! empty( $item->target ) ? $item->target : '';
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$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';
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// If item has_children add atts to a.
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if ( $args->has_children && $depth === 0 ) {
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$atts['href'] = '#';
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$atts['data-toggle'] = 'dropdown';
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$atts['class'] = 'nav-link dropdown-toggle';
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} else {
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$atts['href'] = ! empty( $item->url ) ? $item->url : '';
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$atts['class'] = 'nav-link';
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}
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$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args );
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$attributes = '';
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foreach ( $atts as $attr => $value ) {
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if ( ! empty( $value ) ) {
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$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
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$attributes .= ' ' . $attr . '="' . $value . '"';
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}
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}
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$item_output = $args->before;
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// Font Awesome icons
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if ( ! empty( $icon ) ) {
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$item_output .= '<a' . $attributes . '><span class="fa ' . esc_attr( $icon ) . '"></span> ';
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} else {
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$item_output .= '<a' . $attributes . '>';
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}
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$item_output .= $args->link_before . apply_filters( 'the_title', $item->title,
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$item->ID ) . $args->link_after;
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$item_output .= ( $args->has_children && 0 === $depth ) ? ' <span class="caret"></span></a>' : '</a>';
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$item_output .= $args->after;
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$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
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}
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}
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/**
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* Traverse elements to create list from elements.
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*
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* Display one element if the element doesn't have any children otherwise,
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* display the element and its children. Will only traverse up to the max
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* depth and no ignore elements under that depth.
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*
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* This method shouldn't be called directly, use the walk() method instead.
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*
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* @see Walker::start_el()
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* @since 2.5.0
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*
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* @param object $element Data object
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* @param array $children_elements List of elements to continue traversing.
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* @param int $max_depth Max depth to traverse.
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* @param int $depth Depth of current element.
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* @param array $args
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* @param string $output Passed by reference. Used to append additional content.
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*
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* @return null Null on failure with no changes to parameters.
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*/
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public function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
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if ( ! $element ) {
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return;
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}
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$id_field = $this->db_fields['id'];
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// Display this element.
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if ( is_object( $args[0] ) ) {
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$args[0]->has_children = ! empty( $children_elements[ $element->$id_field ] );
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}
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parent::display_element( $element, $children_elements, $max_depth, $depth, $args, $output );
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}
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/**
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* Menu Fallback
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* =============
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* If this function is assigned to the wp_nav_menu's fallback_cb variable
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* and a manu has not been assigned to the theme location in the WordPress
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* menu manager the function with display nothing to a non-logged in user,
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* and will add a link to the WordPress menu manager if logged in as an admin.
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*
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* @param array $args passed from the wp_nav_menu function.
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*
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*/
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public static function fallback( $args ) {
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if ( current_user_can( 'manage_options' ) ) {
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extract( $args );
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$fb_output = null;
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if ( $container ) {
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$fb_output = '<' . $container;
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if ( $container_class ) {
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$fb_output .= ' class="' . $container_class . '"';
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}
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if ( $container_id ) {
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$fb_output .= ' id="' . $container_id . '"';
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}
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$fb_output .= '>';
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}
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$fb_output .= '<ul';
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if ( $menu_class ) {
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$fb_output .= ' class="' . $menu_class . '"';
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}
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if ( $menu_id ) {
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$fb_output .= ' id="' . $menu_id . '"';
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}
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$fb_output .= '>';
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$fb_output .= '<li><a href="' . admin_url( 'nav-menus.php' ) . '">Add a menu</a></li>';
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$fb_output .= '</ul>';
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if ( $container ) {
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$fb_output .= '</' . $container . '>';
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}
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echo $fb_output;
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}
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}
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}
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endif; /* End if class exists */
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