Categories List Walker for WEN Team (AWPCP's Issue #833)

class-wen-categories-list-walker.php

<?php

if ( ! class_exists( 'Walker' ) ) {
  require_once( ABSPATH . '/wp-includes/class-wp-walker.php' );
}

if ( class_exists( 'Walker' ) ) {

class WEN_CategoriesListWalker extends Walker {

    protected $options = array();

    public function __construct() {
        $this->db_fields = array( 'id' => 'id', 'parent' => 'parent' );
    }

    public function configure( $options = array() ) {
        $this->options = wp_parse_args( $options, array(
            'show_listings_count' => true,
        ) );

        return true;
    }

    public function start_lvl( &$output, $depth = 0, $args = array() ) {
        $output .= '<ul class="dropdown-menu sub-menu">';
    }

    public function end_lvl( &$output, $depth = 0, $args = array() ) {
        $output .= '</ul>';
    }

    public function start_el( &$output, $category, $depth = 0, $args = array(), $current_object_id = 0 ) {
        $element = '<li class="cat-item"><a href="[category-url]">[category-name]</a> [listings-count]';
        $element = str_replace( '[category-url]', esc_attr( url_browsecategory( $category->id ) ), $element );
        $element = str_replace( '[category-name]', esc_attr( $category->name ), $element );
        $element = str_replace( '[listings-count]', $this->render_listings_count( $category ), $element );

        $output .= $element;
    }

    private function render_listings_count( $category ) {
        return $this->options['show_listings_count'] ? '(' . $category->listings_count . ')' : '';
    }

    public function end_el( &$output, $object, $depth = 0, $args = array() ) {
        $output .= '</li>';
    }
}

}