AbstractOrder.php

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

use Magento\Sales\Model\Order;

class AbstractOrder extends \Magento\Backend\Block\Widget
{
    protected $_coreRegistry = null;

    protected $_adminHelper;

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

    public function getOrder()
    {
        if ($this->hasOrder()) {
            return $this->getData('order');
        }
        if ($this->_coreRegistry->registry('current_order')) {
            return $this->_coreRegistry->registry('current_order');
        }
        if ($this->_coreRegistry->registry('order')) {
            return $this->_coreRegistry->registry('order');
        }
        throw new \Magento\Framework\Exception\LocalizedException(__('We can\'t get the order instance right now.'));
    }

    public function getPriceDataObject()
    {
        $obj = $this->getData('price_data_object');
        if ($obj === null) {
            return $this->getOrder();
        }
        return $obj;
    }

    public function displayPriceAttribute($code, $strong = false, $separator = '<br/>')
    {
        return $this->_adminHelper->displayPriceAttribute($this->getPriceDataObject(), $code, $strong, $separator);
    }

    public function displayPrices($basePrice, $price, $strong = false, $separator = '<br/>')
    {
        return $this->_adminHelper->displayPrices(
            $this->getPriceDataObject(),
            $basePrice,
            $price,
            $strong,
            $separator
        );
    }

    public function getOrderTotalData()
    {
        return [];
    }

    public function getOrderInfoData()
    {
        return [];
    }

    public function displayShippingPriceInclTax($order)
    {
        $shipping = $order->getShippingInclTax();
        if ($shipping) {
            $baseShipping = $order->getBaseShippingInclTax();
        } else {
            $shipping = $order->getShippingAmount() + $order->getShippingTaxAmount();
            $baseShipping = $order->getBaseShippingAmount() + $order->getBaseShippingTaxAmount();
        }
        return $this->displayPrices($baseShipping, $shipping, false, ' ');
    }
}