Unassign.php

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<?php
namespace Magento\Sales\Block\Status\Grid\Column;

use Magento\Framework\App\ObjectManager;
use \Magento\Backend\Block\Template\Context;
use Magento\Framework\Serialize\Serializer\Json;

class Unassign extends \Magento\Backend\Block\Widget\Grid\Column
{
    private $json;

    public function __construct(
        Context $context,
        array $data = [],
        ?Json $json = null
    ) {
        parent::__construct($context, $data);
        $this->json = $json ?? ObjectManager::getInstance()->get(Json::class);
    }

    public function getFrameCallback()
    {
        return [$this, 'decorateAction'];
    }

    public function decorateAction($value, $row, $column, $isExport)
    {
        $cell = '';
        $state = $row->getState();
        if (!empty($state)) {
            $url = $this->getUrl('*/*/unassign');
            $label = __('Unassign');
            $cell = '<a href="#" data-post="'
                .$this->escapeHtmlAttr(
                    $this->json->serialize([
                        'action' => $url,
                        'data' => ['status' => $row->getStatus(), 'state' => $row->getState()]
                    ])
                )
                .'">' . $label . '</a>';
        }
        return $cell;
    }
}