yubioath-flutter/lib/android/qr_scanner/qr_scanner_view.dart
2023-09-21 11:40:41 +02:00

180 lines
5.3 KiB
Dart
Executable File

/*
* Copyright (C) 2022-2023 Yubico.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import 'package:flutter/material.dart';
import 'package:flutter_gen/gen_l10n/app_localizations.dart';
import 'package:qrscanner_zxing/qrscanner_zxing_view.dart';
import '../../oath/models.dart';
import 'qr_scanner_overlay_view.dart';
import 'qr_scanner_permissions_view.dart';
import 'qr_scanner_scan_status.dart';
import 'qr_scanner_ui_view.dart';
/// Shows Camera preview, overlay and UI
/// Handles user interactions
class QrScannerView extends StatefulWidget {
const QrScannerView({super.key});
@override
State<QrScannerView> createState() => _QrScannerViewState();
}
GlobalKey<QRScannerZxingViewState> _zxingViewKey = GlobalKey();
class _QrScannerViewState extends State<QrScannerView> {
String? _scannedString;
ScanStatus _status = ScanStatus.scanning;
bool _previewInitialized = false;
bool _permissionsGranted = false;
void setError() {
_scannedString = null;
_status = ScanStatus.error;
Future.delayed(const Duration(milliseconds: 2000), () {
if (mounted) {
resetError();
}
});
}
void resetError() {
setState(() {
_scannedString = null;
_status = ScanStatus.scanning;
_zxingViewKey.currentState?.resumeScanning();
});
}
void handleResult(String qrCodeData) {
if (_status != ScanStatus.scanning) {
// on success and error ignore reported codes
return;
}
setState(() {
if (qrCodeData.isNotEmpty) {
try {
CredentialData.fromUri(Uri.parse(
qrCodeData)); // throws ArgumentError if validation fails
_scannedString = qrCodeData;
_status = ScanStatus.success;
final navigator = Navigator.of(context);
Future.delayed(const Duration(milliseconds: 800), () {
if (navigator.canPop()) {
// prevent several callbacks
navigator.pop(_scannedString);
}
});
} on ArgumentError catch (_) {
setError();
} catch (e) {
setError();
}
} else {
setError();
}
});
}
@override
void initState() {
super.initState();
_status = ScanStatus.scanning;
}
@override
Widget build(BuildContext context) {
final l10n = AppLocalizations.of(context)!;
final screenSize = MediaQuery.of(context).size;
final overlayWidgetKey = GlobalKey();
return Scaffold(
resizeToAvoidBottomInset: false,
extendBodyBehindAppBar: true,
extendBody: true,
appBar: AppBar(
title: Text(
l10n.s_add_account,
style: const TextStyle(color: Colors.white),
),
backgroundColor: Colors.transparent,
foregroundColor: Colors.white,
elevation: 0,
leading: BackButton(
onPressed: () {
Navigator.of(context).pop();
},
),
),
body: Stack(
children: [
Container(
color: Colors.black,
child: const Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [Spacer()])),
Visibility(
maintainState: true,
maintainInteractivity: true,
maintainAnimation: true,
maintainSize: true,
visible: _permissionsGranted,
child: QRScannerZxingView(
key: _zxingViewKey,
marginPct: 10,
onDetect: (scannedData) => handleResult(scannedData),
onViewInitialized: (bool permissionsGranted) {
Future.delayed(const Duration(milliseconds: 50), () {
setState(() {
_previewInitialized = true;
_permissionsGranted = permissionsGranted;
});
});
})),
Visibility(
visible: _permissionsGranted,
child: QRScannerOverlay(
status: _status,
screenSize: screenSize,
overlayWidgetKey: overlayWidgetKey,
)),
Visibility(
visible: _permissionsGranted,
child: QRScannerUI(
status: _status,
screenSize: screenSize,
overlayWidgetKey: overlayWidgetKey,
)),
Visibility(
visible: _previewInitialized && !_permissionsGranted,
child: QRScannerPermissionsUI(
status: _status,
screenSize: screenSize,
onPermissionRequest: () {
_zxingViewKey.currentState?.requestPermissions();
},
)),
],
),
);
}
}