View.php

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<?php
namespace Magento\Shipping\Block\Adminhtml\Order\Tracking;

class View extends \Magento\Shipping\Block\Adminhtml\Order\Tracking
{
    protected $_carrierFactory;

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

    protected function _prepareLayout()
    {
        $onclick = "submitAndReloadArea($('shipment_tracking_info').parentNode, '" . $this->getSubmitUrl() . "')";
        $this->addChild(
            'save_button',
            \Magento\Backend\Block\Widget\Button::class,
            ['label' => __('Add'), 'class' => 'save', 'onclick' => $onclick]
        );
    }

    public function getSubmitUrl()
    {
        return $this->getUrl('adminhtml/*/addTrack/', ['shipment_id' => $this->getShipment()->getId()]);
    }

    public function getSaveButtonHtml()
    {
        return $this->getChildHtml('save_button');
    }

    public function getRemoveUrl($track)
    {
        return $this->getUrl(
            'adminhtml/*/removeTrack/',
            ['shipment_id' => $this->getShipment()->getId(), 'track_id' => $track->getId()]
        );
    }

    public function getCarrierTitle($code)
    {
        $carrier = $this->_carrierFactory->create($code);
        return $carrier ? $carrier->getConfigData('title') : __('Custom Value');
    }
}