/**
* Initialize all order totals relates with tax
*
* @return \Magento\Tax\Block\Sales\Order\Tax
*/
public function initTotals()
{
/** @var $parent \Magento\Sales\Block\Adminhtml\Order\Invoice\Totals */
$parent = $this->getParentBlock();
$this->_order = $parent->getOrder();
$this->_source = $parent->getSource();
$store = $this->getStore();
$allowTax = $this->_source->getTaxAmount() > 0 || $this->_config->displaySalesZeroTax($store);
$grandTotal = (double) $this->_source->getGrandTotal();
if (!$grandTotal || $allowTax && !$this->_config->displaySalesTaxWithGrandTotal($store)) {
$this->_addTax();
}
$this->_initSubtotal();
$this->_initShipping();
$this->_initDiscount();
$this->_initGrandTotal();
return $this;
}
