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*/
/**
* This walker is responsible for displaying the navigation with native bootstrap components
* Cloned by the Twittem aquivalent, since there is no composer package:
* https://github.com/twittem/wp-bootstrap-navwalker
*
*/
class Bootstrap_Walker extends \Walker_Nav_Menu
{
/**
* @inheritdoc
* @since 0.6
*/
public function start_lvl(&$output, $depth = 0, $args = array() )
{
$indent = str_repeat( "\t", $depth );
$output .= "\n$indent\n";
}
public function end_lvl(&$output, $depth = 0, $args = array() )
{
$indent = str_repeat("\t", $depth );
$output .= "\n$indent
\n";
}
/**
* This method uses the Wordpress "the_title" and "walker_nav_menu_start_el" hooks.
*
* @param string $output
* @param \WP_Post $item
* @param int $depth
* @param \stdClass|array $args
* @param int $id
*/
public function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0)
{
if($depth === 0) {
$item_output = $this->build_item($item, $depth, $args, $id);
} else {
$item_output = $this->build_link($item, $depth, $args);
}
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args);
}
/**
* Ends the element output, if needed.
*
* @since 3.0.0
*
* @see Walker::end_el()
*
* @param string $output Passed by reference. Used to append additional content.
* @param WP_Post $item Page data object. Not used.
* @param int $depth Depth of page. Not Used.
* @param stdClass $args An object of wp_nav_menu() arguments.
*/
public function end_el( &$output, $item, $depth = 0, $args = array() ) {
if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
$t = '';
$n = '';
} else {
$t = "\t";
$n = "\n";
}
if($depth == 0) {
$output .= "{$n}";
} else {
$output .= "{$n}";
}
}
/**
* @inheritdoc
* @since 0.6
*/
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 );
}
/**
* @inheritdoc
* @since 0.6
*/
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 .= 'Add a menu';
$fb_output .= '';
if ( $container )
$fb_output .= '';
echo $fb_output;
}*/
}
/**
* Build the parent item.
*
* @param \WP_Post $item
* @param int $depth
* @param \stdClass|array $args
* @param int $id
* @return string
*/
private function build_item($item, $depth, $args, $id)
{
$class = $this->build_item_class_attr($item, $args);
$id = $this->build_item_id_attr($item, $args);
$item_output = sprintf('', $id, $class);
$item_output .= $this->build_link($item, $depth, $args);
return $item_output;
}
/**
* Build the dropdown items for a parent item.
*
* @param \WP_Post $item
* @param int $depth
* @param \stdClass|array $args
* @return string
*/
private function build_link($item, $depth, $args)
{
$indent = str_repeat("\t", $depth);
$link_attrs = $this->build_link_attrs($item, $depth, $args);
$link_attrs = sprintf('%s', $args->before, $link_attrs);
$item_output = $link_attrs;
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= $depth === 0 ? '' : '';
$item_output .= $args->after;
return $item_output;
}
/**
* Build the filtered and escaped id attribute for the item.
* This method uses the Wordpress "nav_menu_item_id" hook.
*
* @param \WP_Post $item
* @param \stdClass|array $args
* @return string
*/
private function build_item_id_attr($item, $args)
{
$id = apply_filters('nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args);
$id = !empty($id) ? sprintf('id="%s"', esc_attr($id)) : '';
return $id;
}
/**
* Build the filtered and escaped class attribute for the item.
* This method uses the Wordpress "nav_menu_css_class" hook.
*
* @param \WP_Post $item
* @param \stdClass|array $args
* @return string
*/
private function build_item_class_attr($item, $args)
{
$classes = !empty($item->classes) ? (array) $item->classes : array();
$classes[] = 'nav-item';
$classes[] = sprintf('nav-item-%s', $item->ID);
if ($args->has_children) {
$classes[] = 'dropdown';
}
if(in_array('current-menu-item', $classes)) {
$classes[] = 'active';
}
$classes = apply_filters('nav_menu_css_class', array_filter($classes), $item, $args);
$class = join(' ', $classes);
$class = !empty($class) ? sprintf('class="%s"', esc_attr($class)) : '';
return $class;
}
/**
* Build the filtered and escaped attributes for link in the item.
* This method uses the Wordpress "nav_menu_link_attributes" hook.
*
* @param \WP_Post$item
* @param int $depth
* @param \stdClass|array$args
* @return string
*/
private function build_link_attrs($item, $depth, $args)
{
$attrs = array();
$attrs['title'] = !empty($item->title) ? $item->title : '';
$attrs['target'] = !empty($item->target) ? $item->target : '';
$attrs['rel'] = !empty($item->xfn) ? $item->xfn : '';
// If item has_children add atts to a.
if ( $args->has_children && $depth === 0 ) {
$attrs['href'] = '#';
$attrs['data-toggle'] = 'dropdown';
$attrs['class'] = 'nav-link dropdown-toggle';
$attrs['aria-haspopup'] = 'true';
$attrs['aria-expanded'] = 'false';
$attrs['id'] = 'navbarDropdownMenuLink';
} elseif($depth === 1) {
$attrs['href'] = ! empty( $item->url ) ? $item->url : '';
$attrs['class'] = 'dropdown-item';
}
else {
$attrs['href'] = ! empty( $item->url ) ? $item->url : '';
$attrs['class'] = 'nav-link';
}
$attrs = apply_filters( 'nav_menu_link_attributes', $attrs, $item, $args );
$attributes = '';
foreach ( $attrs as $attr => $value ) {
if ( ! empty( $value ) ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
return $attributes;
}
}