Templating Wordpress plugin like woocommerce

plugintemplate.php

<?php 

/**
 * Plugin Name: Templating wp plugin like woocommerce
 * Author: Govind Kumar 
 * Author URI: emgk.github.io
 * 
 * Description - 
 * If you want to create template structure for your plugin,
 * that any developer or theme can overide it, Then use this script. 
 *
 */


class PluginTemplate {

	protected static $_instance = NULL;

	private $templateDir = '';

	/**
	 * Create new instance of the class if not exists.
	 *
	 */
	public static function get_instance()  {

        if ( ! isset( self::$_instance ) ) {
	      self::$_instance = new self;
	    }
	    return self::$_instance;

    }

    /**
	 * Not accessible from outside.
     */
	public function __construct( ) { }

	/**
	 * Set plugin template folder.
	 */
	public function setTempDir( $dirname ){

		// return if $dirname not set.
		if ( ! $dirname ) {
			$dirname = 'plugintemplate/';
		}

		// Set template name;
		$this->templateDir = $dirname . '/';
	}

	/**
	 * Get plugin's template folder name.
	 */
	public function getTempDir( ) {

		// Return plugin template folder name.
		return $this->templateDir; 
	}

	/**
	 * Function to call template.
	 *
	 */
	public function get_template_part( $slug, $name = '' ){

		$template = '';

		// Look in yourtheme/slug-name.php and yourtheme/woocommerce/slug-name.php
		$template = locate_template( array( "{$slug}-{$name}.php", $this->getTempDir() . "{$slug}-{$name}.php" ) );

		// Get default slug-name.php
		if ( ! $template && $name && file_exists( plugin_dir_path(__FILE__) . "templates/{$slug}-{$name}.php" ) ) {
			$template =  plugin_dir_path(__FILE__) . "templates/{$slug}-{$name}.php";
		}

		// If template file doesn't exist, look in yourtheme/slug.php and yourtheme/woocommerce/slug.php
		if ( ! $template ){
			$template = locate_template( array( "{$slug}.php", $this->getTempDir() . "{$slug}.php" ) );
		}

		if ( $template ) {
			load_template( $template, false );
		}

	}
}


/**
 * Below part is just demostration for calling the template.
 * You can remove it or use this in another file where you want to call template.
 */

// Register new shortcode on load. 
add_action('init',function(){

	add_shortcode('plugin_template','shortcode_callback');
});

// Shortcode callback function to call template part .
function shortcode_callback(){

	// Set template directory, my plugin template folder name is 'another'.
	PluginTemplate::get_instance()->setTempDir('another');

	// Call template anywhere.
	PluginTemplate::get_instance()->get_template_part('content','product');
  
}