Form.php

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<?php
namespace Magento\Shipping\Block\Adminhtml\View;

class Form extends \Magento\Sales\Block\Adminhtml\Order\AbstractOrder
{
    protected $_carrierFactory;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Sales\Helper\Admin $adminHelper,
        \Magento\Shipping\Model\CarrierFactory $carrierFactory,
        array $data = []
    ) {
        $this->_carrierFactory = $carrierFactory;
        parent::__construct($context, $registry, $adminHelper, $data);
    }

    public function getShipment()
    {
        return $this->_coreRegistry->registry('current_shipment');
    }

    public function getOrder()
    {
        return $this->getShipment()->getOrder();
    }

    public function getSource()
    {
        return $this->getShipment();
    }

    public function getCreateLabelButton()
    {
        $data['shipment_id'] = $this->getShipment()->getId();
        $url = $this->getUrl('adminhtml/order_shipment/createLabel', $data);
        return $this->getLayout()->createBlock(
            \Magento\Backend\Block\Widget\Button::class
        )->setData(
            [
                'label' => __('Create Shipping Label...'),
                'onclick' => 'packaging.showWindow();',
                'class' => 'action-create-label'
            ]
        )->toHtml();
    }

    public function getPrintLabelButton()
    {
        $data['shipment_id'] = $this->getShipment()->getId();
        $url = $this->getUrl('adminhtml/order_shipment/printLabel', $data);
        return $this->getLayout()->createBlock(
            \Magento\Backend\Block\Widget\Button::class
        )->setData(
            ['label' => __('Print Shipping Label'), 'onclick' => 'setLocation(\'' . $url . '\')']
        )->toHtml();
    }

    public function getShowPackagesButton()
    {
        return $this->getLayout()->createBlock(
            \Magento\Backend\Block\Widget\Button::class
        )->setData(
            ['label' => __('Show Packages'), 'onclick' => 'showPackedWindow();']
        )->toHtml();
    }

    public function canCreateShippingLabel()
    {
        $shippingCarrier = $this->_carrierFactory->create(
            $this->getOrder()->getShippingMethod(true)->getCarrierCode()
        );
        return $shippingCarrier && $shippingCarrier->isShippingLabelsAvailable();
    }
}