react-native-esc-pos-printer/lib/module/printer/printHelpers/addViewShot.js

An unofficial React Native library for printing on an EPSON TM printer with the Epson ePOS SDK for iOS and Epson ePOS SDK for Android

"use strict";

import { Platform } from 'react-native';
import { PrinterConstants, FULL_IMAGE_WIDTH_RATIO } from "../constants/index.js";
export async function addViewShot(printer, {
  width,
  viewNode
}) {
  let captureRef = null;
  try {
    const RNViewShot = require('react-native-view-shot');
    captureRef = RNViewShot.captureRef;
  } catch (error) {}
  if (!captureRef) {
    console.error('Install react-native-view-shot to use addViewShot');
    return;
  }
  const {
    value: paperWidth
  } = await printer.getPrinterSetting(PrinterConstants.PRINTER_SETTING_PAPERWIDTH);
  const imageBaset64Uri = await captureRef(viewNode, {
    result: 'base64'
  });
  await printer.addImage({
    source: {
      uri: 'data:image/png;base64,' + imageBaset64Uri
    },
    color: PrinterConstants.COLOR_4,
    mode: PrinterConstants.MODE_GRAY16,
    halftone: PrinterConstants.HALFTONE_THRESHOLD,
    brightness: Platform.OS === 'ios' ? 0.3 : 0.1,
    width: width || FULL_IMAGE_WIDTH_RATIO * paperWidth
  });
}
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