elementor-activator.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
    exit; // Exit if accessed directly.
}
final class Elementor_Test_Extension {
    const VERSION = '1.0.0';
    const MINIMUM_ELEMENTOR_VERSION = '2.0.0';
    const MINIMUM_PHP_VERSION = '7.0';
    private static $_instance = null;

    public static function instance() {

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

    }

    public function __construct() {
        add_action( 'after_setup_theme', [ $this, 'init' ] );
    }

    public function init() {
        if ( ! version_compare( ELEMENTOR_VERSION, self::MINIMUM_ELEMENTOR_VERSION, '>=' ) ) {
            add_action( 'admin_notices', [ $this, 'admin_notice_minimum_elementor_version' ] );
            return;
        }
        if ( version_compare( PHP_VERSION, self::MINIMUM_PHP_VERSION, '<' ) ) {
            add_action( 'admin_notices', [ $this, 'admin_notice_minimum_php_version' ] );
            return;
        }
        add_action( 'elementor/widgets/widgets_registered', [ $this, 'init_widgets' ] );
    }

    public function admin_notice_minimum_elementor_version() {

        if ( isset( $_GET['activate'] ) ) unset( $_GET['activate'] );

        $message = sprintf(
            esc_html__( '"%1$s" requires "%2$s" version %3$s or greater.', 'theme-textdomain' ),
            '<strong>' . esc_html__( 'Elementor Test Extension', 'theme-textdomain' ) . '</strong>',
            '<strong>' . esc_html__( 'Elementor', 'theme-textdomain' ) . '</strong>',
            self::MINIMUM_ELEMENTOR_VERSION
        );

        printf( '<div class="notice notice-warning is-dismissible"><p>%1$s</p></div>', $message );

    }

    public function admin_notice_minimum_php_version() {

        if ( isset( $_GET['activate'] ) ) unset( $_GET['activate'] );

        $message = sprintf(
            esc_html__( '"%1$s" requires "%2$s" version %3$s or greater.', 'theme-textdomain' ),
            '<strong>' . esc_html__( 'Elementor Test Extension', 'theme-textdomain' ) . '</strong>',
            '<strong>' . esc_html__( 'PHP', 'theme-textdomain' ) . '</strong>',
            self::MINIMUM_PHP_VERSION
        );

        printf( '<div class="notice notice-warning is-dismissible"><p>%1$s</p></div>', $message );

    }

    public function init_widgets() {
        require_once( __DIR__ . '/widgets/test-widget.php' );
        \Elementor\Plugin::instance()->widgets_manager->register_widget_type( new \testWidget() );

    }


}

Elementor_Test_Extension::instance();