woo-metismenu.php

<?php
/**
 * Plugin Name: Woo Responsive Product Category
 * Plugin URI: http://sketsaweb.com/
 * Description: Display WooCommerce Product Categories Widget in Responsive
 * Version: 1.0
 * Author: Ponco
 * Author URI: http://sketsaweb.com
 * License: GPL
 */
add_action('wp_enqueue_scripts', 'load_woometismenu_assets');

function load_woometismenu_assets() {
    wp_enqueue_style('metismenu', plugin_dir_url(__FILE__) . 'assets/metismenu/metisMenu.min.css');
    wp_enqueue_style('woo-metismenu', plugin_dir_url(__FILE__) . 'assets/woo-metismenu.css');
    wp_enqueue_script('metismenu', plugin_dir_url(__FILE__) . 'assets/metismenu/metisMenu.min.js', array('jquery'), '1.0', true);
    wp_enqueue_script('woo-metismenu', plugin_dir_url(__FILE__) . 'assets/woo-metismenu.js', array('jquery', 'metismenu'), '1.0', true);
}

class WooMetisMenu {

    function displayCategoriesMetis() {
        $list_args = array('show_count' => false, 'hierarchical' => true, 'taxonomy' => 'product_cat', 'hide_empty' => false);
        $list_args['title_li'] = NULL;
        echo '<ul class="product-categories metismenu" id="menumetis">';
        wp_list_categories(apply_filters('woocommerce_product_categories_widget_args', $list_args));
        echo '</ul>';
    }

}

// Creating the widget 
class woometismenu_widget extends WP_Widget {

    function __construct() {
        parent::__construct(
// Base ID of your widget
                'woometismenu_widget',
// Widget name will appear in UI
                __('Woo Responsive Product Category', 'woometismenu'),
// Widget description
                array('description' => __('Display WooCommerce MetisMenu Category Widget', 'woometismenu'),)
        );
    }

// Creating widget front-end
// This is where the action happens
    public function widget($args, $instance) {
        $title = apply_filters('widget_title', $instance['title']);
// before and after widget arguments are defined by themes
        echo $args['before_widget'];
        if (!empty($title))
            echo $args['before_title'] . $title . $args['after_title'];

// This is where you run the code and display the output
        $wsm = new WooMetisMenu;
        echo '<nav class="sidebar-nav">';
        $wsm->displayCategoriesMetis();
        echo '</nav>';
        echo $args['after_widget'];
    }

// Widget Backend 
    public function form($instance) {
        if (isset($instance['title'])) {
            $title = $instance['title'];
        } else {
            $title = __('Categories', 'woometismenu');
        }
// Widget admin form
        ?>
        <p>
            <label for="<?php echo $this->get_field_id('title'); ?>">
        <?php _e('Title:'); ?>
            </label>
            <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($title); ?>" />
        </p>
                <?php
            }

// Updating widget replacing old instances with new
            public function update($new_instance, $old_instance) {
                $instance = array();
                $instance['title'] = (!empty($new_instance['title']) ) ? strip_tags($new_instance['title']) : '';
                return $instance;
            }

        }

        // Class woometismenu_widget ends here
// Register and load the widget
        function woometismenu_load_widget() {
            register_widget('woometismenu_widget');
        }

        add_action('widgets_init', 'woometismenu_load_widget');