ShowButtonsCommand.php

<?php

namespace Drupal\views\Ajax;

use Drupal\Core\Ajax\CommandInterface;

/**
 * Provides an AJAX command for showing the save and cancel buttons.
 *
 * This command is implemented in Drupal.AjaxCommands.prototype.viewsShowButtons.
 */
class ShowButtonsCommand implements CommandInterface {
    
    /**
     * Whether the view has been changed.
     *
     * @var bool
     */
    protected $changed;
    
    /**
     * Constructs a \Drupal\views\Ajax\ShowButtonsCommand object.
     *
     * @param bool $changed
     *   Whether the view has been changed.
     */
    public function __construct($changed) {
        $this->changed = $changed;
    }
    
    /**
     * {@inheritdoc}
     */
    public function render() {
        return [
            'command' => 'viewsShowButtons',
            'changed' => $this->changed,
        ];
    }

}