Button.php

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<?php
namespace Magento\Paypal\Block\Express\InContext\Minicart;

use Magento\Checkout\Model\Session;
use Magento\Payment\Model\MethodInterface;
use Magento\Paypal\Model\Config;
use Magento\Paypal\Model\ConfigFactory;
use Magento\Paypal\Block\Express\InContext;
use Magento\Framework\View\Element\Template;
use Magento\Catalog\Block\ShortcutInterface;
use Magento\Framework\Locale\ResolverInterface;
use Magento\Framework\View\Element\Template\Context;

class Button extends Template implements ShortcutInterface
{
    const ALIAS_ELEMENT_INDEX = 'alias';

    const PAYPAL_BUTTON_ID = 'paypal-express-in-context-checkout-main';

    const BUTTON_ELEMENT_INDEX = 'button_id';

    const LINK_DATA_ACTION = 'link_data_action';

    const CART_BUTTON_ELEMENT_INDEX = 'add_to_cart_selector';

    private $isMiniCart = false;

    private $localeResolver;

    private $config;

    private $payment;

    private $session;

    public function __construct(
        Context $context,
        ResolverInterface $localeResolver,
        ConfigFactory $configFactory,
        Session $session,
        MethodInterface $payment,
        array $data = []
    ) {
        parent::__construct($context, $data);

        $this->localeResolver = $localeResolver;
        $this->config = $configFactory->create();
        $this->config->setMethod(Config::METHOD_EXPRESS);
        $this->payment = $payment;
        $this->session = $session;
    }

    private function isInContext()
    {
        return (bool)(int) $this->config->getValue('in_context');
    }

    private function isVisibleOnCart()
    {
        return (bool)(int) $this->config->getValue('visible_on_cart');
    }

    protected function shouldRender()
    {
        return $this->payment->isAvailable($this->session->getQuote())
            && $this->isMiniCart
            && $this->isInContext()
            && $this->isVisibleOnCart();
    }

    protected function _toHtml()
    {
        if (!$this->shouldRender()) {
            return '';
        }

        return parent::_toHtml();
    }

    public function getContainerId()
    {
        return $this->getData(self::BUTTON_ELEMENT_INDEX);
    }

    public function getLinkAction()
    {
        return $this->getData(self::LINK_DATA_ACTION);
    }

    public function getAddToCartSelector()
    {
        return $this->getData(self::CART_BUTTON_ELEMENT_INDEX);
    }

    public function getImageUrl()
    {
        return $this->config->getExpressCheckoutInContextImageUrl(
            $this->localeResolver->getLocale()
        );
    }

    public function getAlias()
    {
        return $this->getData(self::ALIAS_ELEMENT_INDEX);
    }

    public function setIsInCatalogProduct($isCatalog)
    {
        $this->isMiniCart = !$isCatalog;

        return $this;
    }
}