DeleteButton.php

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<?php
namespace Magento\Customer\Block\Adminhtml\Edit;

use Magento\Customer\Api\AccountManagementInterface;
use Magento\Framework\View\Element\UiComponent\Control\ButtonProviderInterface;

class DeleteButton extends GenericButton implements ButtonProviderInterface
{
    protected $customerAccountManagement;

    public function __construct(
        \Magento\Backend\Block\Widget\Context $context,
        \Magento\Framework\Registry $registry,
        AccountManagementInterface $customerAccountManagement
    ) {
        parent::__construct($context, $registry);
        $this->customerAccountManagement = $customerAccountManagement;
    }

    public function getButtonData()
    {
        $customerId = $this->getCustomerId();
        $canModify = $customerId && !$this->customerAccountManagement->isReadonly($this->getCustomerId());
        $data = [];
        if ($customerId && $canModify) {
            $data = [
                'label' => __('Delete Customer'),
                'class' => 'delete',
                'id' => 'customer-edit-delete-button',
                'data_attribute' => [
                    'url' => $this->getDeleteUrl()
                ],
                'on_click' => '',
                'sort_order' => 20,
            ];
        }
        return $data;
    }

    public function getDeleteUrl()
    {
        return $this->getUrl('*/*/delete', ['id' => $this->getCustomerId()]);
    }
}