Tracking.php

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

class Tracking extends \Magento\Backend\Block\Template
{
    protected $_coreRegistry = null;

    protected $_shippingConfig;

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

    protected function _prepareLayout()
    {
        $this->addChild(
            'add_button',
            \Magento\Backend\Block\Widget\Button::class,
            ['label' => __('Add Tracking Number'), 'class' => '', 'onclick' => 'trackingControl.add()']
        );
    }

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

    public function getCarriers()
    {
        $carriers = [];
        $carrierInstances = $this->_getCarriersInstances();
        $carriers['custom'] = __('Custom Value');
        foreach ($carrierInstances as $code => $carrier) {
            if ($carrier->isTrackingAvailable()) {
                $carriers[$code] = $carrier->getConfigData('title');
            }
        }
        return $carriers;
    }

    protected function _getCarriersInstances()
    {
        return $this->_shippingConfig->getAllCarriers($this->getShipment()->getStoreId());
    }
}