Multiaction.php

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<?php
namespace Magento\Customer\Block\Adminhtml\Grid\Renderer;

class Multiaction extends \Magento\Backend\Block\Widget\Grid\Column\Renderer\Action
{
    public function render(\Magento\Framework\DataObject $row)
    {
        $html = '';
        $actions = $this->getColumn()->getActions();
        if (!empty($actions) && is_array($actions)) {
            $links = [];
            foreach ($actions as $action) {
                if (is_array($action)) {
                    $link = $this->_toLinkHtml($action, $row);
                    if ($link) {
                        $links[] = $link;
                    }
                }
            }
            $html = implode('<br />', $links);
        }

        if ($html == '') {
            $html = '&nbsp;';
        }

        return $html;
    }

    protected function _toLinkHtml($action, \Magento\Framework\DataObject $row)
    {
        $product = $row->getProduct();

        if (isset($action['process']) && $action['process'] == 'configurable') {
            if ($product->canConfigure()) {
                $style = '';
                $onClick = sprintf('onclick="return %s.configureItem(%s)"', $action['control_object'], $row->getId());
                return sprintf('<a href="%s" %s %s>%s</a>', $action['url'], $style, $onClick, $action['caption']);
            } else {
                return false;
            }
        } else {
            return parent::_toLinkHtml($action, $row);
        }
    }
}