woocommerce-paypal-payments/modules/ppcp-googlepay/resources/js/boot-admin.js

import GooglepayButton from "./GooglepayButton";
import PreviewButton from "../../../ppcp-button/resources/js/modules/Renderer/PreviewButton";
import PreviewButtonManager from "../../../ppcp-button/resources/js/modules/Renderer/PreviewButtonManager";

/**
 * Accessor that creates and returns a single PreviewButtonManager instance.
 */
const buttonManager = () => {
    if (!GooglePayPreviewButtonManager.instance) {
        GooglePayPreviewButtonManager.instance = new GooglePayPreviewButtonManager();
    }

    return GooglePayPreviewButtonManager.instance;
}


/**
 * Manages all GooglePay preview buttons on this page.
 */
class GooglePayPreviewButtonManager extends PreviewButtonManager {
    constructor() {
        const args = {
            methodName: 'GooglePay',
            buttonConfig: window.wc_ppcp_googlepay_admin
        };

        super(args);
    }

    /**
     * Responsible for fetching and returning the PayPal configuration object for this payment
     * method.
     *
     * @param {{}} payPal - The PayPal SDK object provided by WidgetBuilder.
     * @return {Promise<{}>}
     */
    async fetchConfig(payPal) {
        const apiMethod = payPal?.Googlepay()?.config

        if (!apiMethod) {
            this.error('configuration object cannot be retrieved from PayPal');
            return {};
        }

        return await apiMethod();
    }

    /**
     * This method is responsible for creating a new PreviewButton instance and returning it.
     *
     * @param {string} wrapperId - CSS ID of the wrapper element.
     * @return {GooglePayPreviewButton}
     */
    createButtonInst(wrapperId) {
        return new GooglePayPreviewButton({
            selector: wrapperId,
            apiConfig: this.apiConfig
        });
    }
}


/**
 * A single GooglePay preview button instance.
 */
class GooglePayPreviewButton extends PreviewButton {
    constructor(args) {
        super(args);

        this.selector = `${args.selector}GooglePay`
        this.defaultAttributes = {
            button: {
                style: {
                    type: 'pay',
                    color: 'black',
                    language: 'en'
                }
            }
        };
    }

    createNewWrapper() {
        const element = super.createNewWrapper();
        element.addClass('ppcp-button-googlepay');

        return element;
    }

    createButton(buttonConfig) {
        const button = new GooglepayButton(
            'preview',
            null,
            buttonConfig,
            this.ppcpConfig,
        );

        button.init(this.apiConfig);
    }

    /**
     * Merge form details into the config object for preview.
     * Mutates the previewConfig object; no return value.
     */
    dynamicPreviewConfig(buttonConfig, ppcpConfig) {
        // Merge the current form-values into the preview-button configuration.
        if (ppcpConfig.button && buttonConfig.button) {
            Object.assign(buttonConfig.button.style, ppcpConfig.button.style);
        }
    }
}

// Initialize the preview button manager.
buttonManager();