SetFormCommand.php

<?php

namespace Drupal\views_ui\Ajax;

use Drupal\Core\Ajax\CommandInterface;

/**
 * Provides an AJAX command for setting a form submit URL in modal forms.
 *
 * This command is implemented in Drupal.AjaxCommands.prototype.viewsSetForm.
 */
class SetFormCommand implements CommandInterface {
    
    /**
     * The URL of the form.
     *
     * @var string
     */
    protected $url;
    
    /**
     * Constructs a SetFormCommand object.
     *
     * @param string $url
     *   The URL of the form.
     */
    public function __construct($url) {
        $this->url = $url;
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        return [
            'command' => 'viewsSetForm',
            'url' => $this->url,
        ];
    }

}