Elementor widget skeleton

<?php
/**
 * A "Callout" widget for Elementor.
 *
 * @package Acme_Core
 */

namespace Acme\Core\Elementor;

use Elementor\Controls_Manager;
use Elementor\Widget_Base;

defined( 'ABSPATH' ) || exit;

class Callout_Widget extends Widget_Base {

	public function get_name(): string {
		return 'acme-callout';
	}

	public function get_title(): string {
		return esc_html__( 'Callout', 'acme-core' );
	}

	public function get_icon(): string {
		return 'eicon-info-box';
	}

	public function get_categories(): array {
		return array( 'general' );
	}

	protected function register_controls(): void {
		$this->start_controls_section( 'content', array(
			'label' => esc_html__( 'Content', 'acme-core' ),
			'tab'   => Controls_Manager::TAB_CONTENT,
		) );

		$this->add_control( 'title', array(
			'label'   => esc_html__( 'Title', 'acme-core' ),
			'type'    => Controls_Manager::TEXT,
			'default' => esc_html__( 'Heads up', 'acme-core' ),
		) );

		$this->add_control( 'tone', array(
			'label'   => esc_html__( 'Tone', 'acme-core' ),
			'type'    => Controls_Manager::SELECT,
			'options' => array( 'info' => 'Info', 'warn' => 'Warning' ),
			'default' => 'info',
		) );

		$this->add_control( 'link', array(
			'label' => esc_html__( 'Link', 'acme-core' ),
			'type'  => Controls_Manager::URL,
		) );

		$this->end_controls_section();
	}

	protected function render(): void {
		$s    = $this->get_settings_for_display();
		$tone = in_array( $s['tone'], array( 'info', 'warn' ), true ) ? $s['tone'] : 'info';

		$this->add_render_attribute( 'wrap', 'class', array( 'acme-callout', 'acme-callout--' . $tone ) );
		if ( ! empty( $s['link']['url'] ) ) {
			$this->add_link_attributes( 'a', $s['link'] );
		}
		?>
		<div <?php $this->print_render_attribute_string( 'wrap' ); ?>>
			<strong><?php echo esc_html( $s['title'] ); ?></strong>
			<?php if ( ! empty( $s['link']['url'] ) ) : ?>
				<a <?php $this->print_render_attribute_string( 'a' ); ?>><?php esc_html_e( 'Read more', 'acme-core' ); ?></a>
			<?php endif; ?>
		</div>
		<?php
	}
}

// Registration (put in your plugin or theme bootstrap):
add_action( 'elementor/widgets/register', static function ( $widgets_manager ): void {
	$widgets_manager->register( new Callout_Widget() );
} );