react-zxing
Version:
Integrate zxing to your React application using a custom hook
152 lines (151 loc) • 7.63 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (_) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
var __rest = (this && this.__rest) || function (s, e) {
var t = {};
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
t[p] = s[p];
if (s != null && typeof Object.getOwnPropertySymbols === "function")
for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
t[p[i]] = s[p[i]];
}
return t;
};
import { useCallback, useEffect, useRef, useState } from "react";
import { DEFAULT_CONSTRAINTS } from "./constants";
import { useBrowserMultiFormatReader } from "./useBrowserMultiFormatReader";
import { useTorch } from "./useTorch";
import { deepCompareObjects } from "./utils";
export var useZxing = function (options) {
if (options === void 0) { options = {}; }
var _a = options.paused, paused = _a === void 0 ? false : _a, hints = options.hints, timeBetweenDecodingAttempts = options.timeBetweenDecodingAttempts, _b = options.onDecodeResult, onDecodeResult = _b === void 0 ? function () { } : _b, _c = options.onDecodeError, onDecodeError = _c === void 0 ? function () { } : _c, _d = options.onError, onError = _d === void 0 ? function () { } : _d;
var deviceId = "deviceId" in options ? options.deviceId : undefined;
var _e = useState("constraints" in options ? options.constraints : undefined), constraints = _e[0], setConstraints = _e[1];
var decodeResultHandlerRef = useRef(onDecodeResult);
var decodeErrorHandlerRef = useRef(onDecodeError);
var errorHandlerRef = useRef(onError);
var ref = useRef(null);
var reader = useBrowserMultiFormatReader({
hints: hints,
timeBetweenDecodingAttempts: timeBetweenDecodingAttempts,
});
var _f = useTorch({
resetStream: function () { return __awaiter(void 0, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
stopDecoding();
return [4 /*yield*/, startDecoding()];
case 1:
_a.sent();
return [2 /*return*/];
}
});
}); },
}), torchInit = _f.init, torch = __rest(_f, ["init"]);
var decodeCallback = useCallback(function (result, error) {
if (result)
decodeResultHandlerRef.current(result);
if (error)
decodeErrorHandlerRef.current(error);
}, []);
var startDecoding = useCallback(function () { return __awaiter(void 0, void 0, void 0, function () {
var e_1, mediaStream, videoTrack;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (!ref.current)
return [2 /*return*/];
if (paused)
return [2 /*return*/];
_a.label = 1;
case 1:
_a.trys.push([1, 6, , 7]);
if (!deviceId) return [3 /*break*/, 3];
return [4 /*yield*/, reader.decodeFromVideoDevice(deviceId, ref.current, decodeCallback)];
case 2:
_a.sent();
return [3 /*break*/, 5];
case 3: return [4 /*yield*/, reader.decodeFromConstraints(constraints !== null && constraints !== void 0 ? constraints : DEFAULT_CONSTRAINTS, ref.current, decodeCallback)];
case 4:
_a.sent();
_a.label = 5;
case 5: return [3 /*break*/, 7];
case 6:
e_1 = _a.sent();
errorHandlerRef.current(e_1);
return [2 /*return*/];
case 7:
if (!ref.current)
return [2 /*return*/];
mediaStream = ref.current.srcObject;
videoTrack = mediaStream.getVideoTracks()[0];
if (videoTrack)
torchInit(videoTrack);
return [2 /*return*/];
}
});
}); }, [reader, deviceId, constraints, paused, decodeCallback, torchInit]);
var stopDecoding = useCallback(function () {
reader.reset();
}, [reader]);
useEffect(function () {
decodeResultHandlerRef.current = onDecodeResult;
}, [onDecodeResult]);
useEffect(function () {
decodeErrorHandlerRef.current = onDecodeError;
}, [onDecodeError]);
useEffect(function () {
errorHandlerRef.current = onError;
}, [onError]);
useEffect(function () {
var isConstraintsValueSame = deepCompareObjects(constraints, options.constraints);
if (!isConstraintsValueSame) {
setConstraints(options.constraints);
}
}, [constraints, options]);
useEffect(function () {
startDecoding();
return function () {
stopDecoding();
};
}, [startDecoding, stopDecoding]);
return {
ref: ref,
torch: torch,
};
};