cleverness/widget-css-classes

<?php
/**
 * Widget CSS Classes Plugin Loader.
 *
 * Loader
 * @author C.M. Kendrick <cindy@cleverness.org>
 * @package widget-css-classes
 * @version 1.5.2.1
 */

/**
 * Loader class.
 * @package widget-css-classes
 * @subpackage includes
 */
class WCSSC_Loader {

    /**
     * Plugin Loader init.
     * @static
     * @since 1.0
     */
    public static function init() {
        self::check_for_upgrade();
        self::include_files();
        self::add_wp_hooks();

        // Instantiate settings (admin) class.
        new WCSSC_Settings();
    }

    /**
     * Check to see if plugin has an upgrade.
     * @static
     * @since 1.0
     */
    private static function check_for_upgrade() {
        widget_css_classes_activation();
    }

    /**
     * Calls the plugin files for inclusion.
     * @static
     * @since 1.0
     */
    private static function include_files() {
        include_once WCSSC_PLUGIN_DIR . 'includes/widget-css-classes-settings.class.php';
        include_once WCSSC_PLUGIN_DIR . 'includes/widget-css-classes.class.php';
    }

    /**
     * Adds WordPress hooks for actions and filters.
     * @static
     * @since 1.0
     */
    private static function add_wp_hooks() {
        add_action( 'admin_enqueue_scripts', array( __CLASS__, 'enqueue_scripts_styles' ) );
        add_action( 'in_widget_form', array( 'WCSSC', 'extend_widget_form' ), 10, 3 );
        add_filter( 'widget_update_callback', array( 'WCSSC', 'update_widget' ), 10, 2 );
        add_filter( 'plugin_action_links', array( 'WCSSC_Lib', 'add_settings_link' ), 10, 2 );
    }

    /**
     * Load the plugin CSS, JS and Help tab.
     * @static
     * @since 1.0
     */
    public static function enqueue_scripts_styles() {
        $screen = get_current_screen();

        // if on the settings page.
        if ( 'settings_page_widget-css-classes-settings' === $screen->id ) {
            wp_enqueue_style( 'widget-css-classes_css', WCSSC_PLUGIN_URL . '/css/widget-css-classes.css', array(), WCSSC_PLUGIN_VERSION );
            wp_enqueue_script( 'widget-css-classes_js', WCSSC_PLUGIN_URL . '/js/widget-css-classes.js', array( 'jquery' ), WCSSC_PLUGIN_VERSION );
        }
    }

}