From 9c965b316f96a0dfc4b466a8666ad61bb27cf605 Mon Sep 17 00:00:00 2001
From: bluestreamlds <85561356+bluestreamlds@users.noreply.github.com>
Date: Fri, 21 Jan 2022 12:08:17 +0530
Subject: [PATCH] Feature - Scanner for Bar and QR code (#11)

* Added: code reader component

* Added: no device detected handler

* Update: ID hooking to video element

* Update: Defer stream start

* Linted

* Added: grant permissions

* Added: media device scan

* Removed loggers and cleanup

Co-authored-by: Llewellyn D'souza <lledsouza2209@gmail.com>
---
 src/components/CodeScanner/index.js | 97 +++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/components/CodeScanner/index.js

diff --git a/src/components/CodeScanner/index.js b/src/components/CodeScanner/index.js
new file mode 100644
index 0000000..b578f26
--- /dev/null
+++ b/src/components/CodeScanner/index.js
@@ -0,0 +1,97 @@
+import React, { useState, useEffect, useMemo } from 'react';
+import PropTypes from 'prop-types';
+import LOGGER from 'services/Logger';
+
+import { BrowserMultiFormatReader, NotFoundException } from '@zxing/library';
+
+export default function CodeScanner({ onDetect, width, height }) {
+  // const [decoded, setDecoded] = useState(null);
+  const [selectedDeviceId, setSelectedDeviceId] = useState(null);
+  const [videoInputDevices, setVideoInputDevices] = useState(null);
+  const getMediaDevices = (reader) => {
+    reader
+      .listVideoInputDevices()
+      .then((videoIPDevices) => {
+        setVideoInputDevices(videoIPDevices);
+        if (videoIPDevices && videoIPDevices.length > 0) {
+          setSelectedDeviceId(videoIPDevices[0].deviceId);
+        }
+      })
+      .catch(LOGGER.log);
+  };
+
+  const codeReader = useMemo(() => {
+    // LOGGER.log('Initializing code reader');
+    const reader = new BrowserMultiFormatReader();
+    getMediaDevices(reader);
+    return reader;
+  }, []);
+
+  // LOGGER.log('hasNavigator', codeReader.hasNavigator);
+  // LOGGER.log('isMediaDeviceSupported', codeReader.isMediaDevicesSuported);
+
+  useEffect(() => {
+    !selectedDeviceId && getMediaDevices(codeReader);
+
+    async function startStream() {
+      // LOGGER.log('Starting stream');
+      if (videoInputDevices) {
+        codeReader
+          .decodeFromVideoDevice(selectedDeviceId, '#scan-view', (result, err) => {
+            if (result) {
+              LOGGER.log(result);
+              onDetect(result.text);
+              // setDecoded(result.text);
+            }
+            if (err && !(err instanceof NotFoundException)) {
+              LOGGER.error(err);
+            }
+          })
+          .catch(() => {
+            getMediaDevices(codeReader);
+          });
+      }
+    }
+    startStream();
+    return () => {
+      // LOGGER.log('resetting code reader');
+      codeReader.reset();
+    };
+  }, [selectedDeviceId]);
+
+  // Use when debugging
+  // return videoInputDevices && selectedDeviceId ? (
+  //   <div>
+  //     <video id="#scan-view" width={width.toString()} height={height.toString()} />
+  //     <p>Value: {decoded}</p>
+  //     <br />
+  //     <br />
+  //     <pre style={{ fontSize: 12 }}>
+  //       Debug data: <br /> {JSON.stringify(videoInputDevices, null, 4)}
+  //     </pre>
+  //   </div>
+  // ) : (
+  //   <p>Not supported</p>
+  // );
+
+  return codeReader.hasNavigator && codeReader.isMediaDevicesSuported ? (
+    videoInputDevices && selectedDeviceId ? (
+      <video id="#scan-view" width={width.toString()} height={height.toString()} />
+    ) : (
+      <p>Please grant camera permissions</p>
+    )
+  ) : (
+    <p>Not supported</p>
+  );
+}
+
+CodeScanner.defaultProps = {
+  width: 300,
+  height: 200
+};
+
+CodeScanner.propTypes = {
+  onDetect: PropTypes.func.isRequired,
+  width: PropTypes.number,
+  height: PropTypes.number
+};