Badged/badged/admin/class-badged-admin.php

<?php
/**
 * Badged
 *
 * @package   Badged
 * @author    Matthias Kretschmann <m@kretschmann.io>
 * @license   GPL-2.0+
 * @link      http://kremalicious.com/badged/
 * @copyright 2013 Matthias Kretschmann
 */

/**
 * Plugin class.
 *
 *
 * @package Badged_Admin
 * @author  Matthias Kretschmann <m@kretschmann.io>
 */
class Badged_Admin {

	/**
	 * Instance of this class.
	 *
	 * @since   2.0.0
	 * @var      object
	 */
	protected static $instance = null;

	/**
	 * Slug of the plugin screen.
	 *
	 * @since   2.0.0
	 * @var      string
	 */
	protected $plugin_screen_hook_suffix = null;

	/**
	 * Initialize the plugin by loading admin scripts & styles and adding a
	 * settings page and menu.
	 *
	 * @since   2.0.0
	 */
	private function __construct() {
        
		$plugin = Badged::get_instance();
		$this->plugin_slug = $plugin->get_plugin_slug();
        
		// Load admin style sheet
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_styles' ) );
        
		// Add the options page and menu item.
		add_action( 'admin_menu', array( $this, 'add_plugin_admin_menu' ) );
        
		// Add an action link pointing to the options page.
		$plugin_basename = plugin_basename( plugin_dir_path( __DIR__ ) . $this->plugin_slug . '.php' );
		add_filter( 'plugin_action_links_' . $plugin_basename, array( $this, 'add_action_links' ) );
        
		/*
		 * Do Custom Stuff
		 *
		 */

	}

	/**
	 * Return an instance of this class.
	 *
	 * @since   2.0.0
	 * @return    object    A single instance of this class.
	 */
	public static function get_instance() {

		// If the single instance hasn't been set, set it now.
		if ( null == self::$instance ) {
			self::$instance = new self;
		}

		return self::$instance;
	}

	/**
	 * Register and enqueue admin-specific style sheet.
	 *
	 * @since   2.0.0
	 * @return    null    Return early if no settings page is registered.
	 */
	public function enqueue_admin_styles() {

		if ( ! isset( $this->plugin_screen_hook_suffix ) ) {
            return;
        }

		$screen = get_current_screen();
        if ( $screen->id == $this->plugin_screen_hook_suffix ) {
            wp_enqueue_style( $this->plugin_slug .'-admin-styles', BADGED_URL . 'admin/assets/css/admin.css', array(), Badged::VERSION );
        }
		
		wp_enqueue_style( $this->plugin_slug .'-badged-styles', BADGED_URL . 'admin/assets/css/badged.css', array(), Badged::VERSION );

	}

	/**
	 * Register the administration menu for this plugin into the WordPress Dashboard menu.
	 * @since   2.0.0
	 */
	public function add_plugin_admin_menu() {

		$this->plugin_screen_hook_suffix = add_options_page(
			__( 'Badged Settings', $this->plugin_slug ),
			__( 'Badged', $this->plugin_slug ),
			'read',
			$this->plugin_slug,
			array( $this, 'display_plugin_admin_page' )
		);

	}

	/**
	 * Render the settings page for this plugin.
	 * @since   2.0.0
	 */
	public function display_plugin_admin_page() {
		include_once( 'views/admin.php' );
	}

	

	/**
	 * Add settings action link to the plugins page.
	 *
	 * @since    2.0.0
	 */
	public function add_action_links( $links ) {

		return array_merge(
			array(
				'settings' => '<a href="' . admin_url( 'options-general.php?page=' . $this->plugin_slug ) . '">' . __( 'Settings', $this->plugin_slug ) . '</a>'
			),
			$links
		);

	}
    
	/**
	 *        WordPress Actions: http://codex.wordpress.org/Plugin_API#Actions
	 *        Action Reference:  http://codex.wordpress.org/Plugin_API/Action_Reference
	 *
	 * @since   2.0.0
	 */
	public function action_method_name() {
		// TODO: Define your action hook callback here
	}

}