Weee.php

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<?php
namespace Magento\Weee\Model\Sales\Pdf;

class Weee extends \Magento\Sales\Model\Order\Pdf\Total\DefaultTotal
{
    protected $_weeeData;

    public function __construct(
        \Magento\Tax\Helper\Data $taxHelper,
        \Magento\Tax\Model\Calculation $taxCalculation,
        \Magento\Tax\Model\ResourceModel\Sales\Order\Tax\CollectionFactory $ordersFactory,
        \Magento\Weee\Helper\Data $_weeeData,
        array $data = []
    ) {
        $this->_weeeData = $_weeeData;
        parent::__construct($taxHelper, $taxCalculation, $ordersFactory, $data);
    }

    public function getTotalsForDisplay()
    {
        $items = $this->getSource()->getAllItems();
        $store = $this->getSource()->getStore();

        $weeeTotal = $this->_weeeData->getTotalAmounts($items, $store);

        // If we have no Weee, check if we still need to display it
        if (!$weeeTotal && !filter_var($this->getDisplayZero(), FILTER_VALIDATE_BOOLEAN)) {
            return [];
        }

        // Display the Weee total amount
        $fontSize = $this->getFontSize() ? $this->getFontSize() : 7;
        $totals = [
            [
                'amount' => $this->getOrder()->formatPriceTxt($weeeTotal),
                'label' => __($this->getTitle()) . ':',
                'font_size' => $fontSize,
            ],
        ];

        return $totals;
    }
}