yubioath-flutter/android/flutter_plugins/qrscanner_zxing/lib/qrscanner_zxing_view.dart
2023-11-15 08:17:46 +01:00

129 lines
4.1 KiB
Dart

/*
* Copyright (C) 2022 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 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
class QRScannerZxingView extends StatefulWidget {
final int marginPct;
/// Called when a code has been detected.
final Function(String rawData) onDetect;
/// Called before the system UI with runtime permissions request is
/// displayed.
final Function()? beforePermissionsRequest;
/// Called after the view is completely initialized.
///
/// permissionsGranted is true if the user granted camera permissions.
final Function(bool permissionsGranted) onViewInitialized;
const QRScannerZxingView(
{super.key,
required this.marginPct,
required this.onDetect,
this.beforePermissionsRequest,
required this.onViewInitialized});
@override
QRScannerZxingViewState createState() => QRScannerZxingViewState();
}
class QRScannerZxingViewState extends State<QRScannerZxingView> {
final MethodChannel channel = const MethodChannel(
"com.yubico.authenticator.flutter_plugins.qr_scanner_channel");
QRScannerZxingViewState() : super() {
channel.setMethodCallHandler((call) async {
try {
switch (call.method) {
case "codeFound":
var arguments = jsonDecode(call.arguments);
var rawValue = arguments["value"];
widget.onDetect(rawValue);
return;
case "beforePermissionsRequest":
widget.beforePermissionsRequest?.call();
return;
case "viewInitialized":
var arguments = jsonDecode(call.arguments);
var permissionsGranted = arguments["permissionsGranted"];
widget.onViewInitialized(permissionsGranted);
return;
}
} catch (e) {
if (kDebugMode) {
debugPrint("Exception in onDetect: $e}");
}
}
});
}
void requestPermissions() {
debugPrint("Permissions requested");
channel.invokeMethod("requestCameraPermissions", null);
}
void resumeScanning() async {
debugPrint("Resuming QR code scanning");
await channel.invokeMethod("resumeScanning", null);
}
@override
void dispose() {
super.dispose();
channel.setMethodCallHandler(null);
}
@override
Widget build(BuildContext context) {
const String viewType = 'qrScannerNativeView';
Map<String, dynamic> creationParams = <String, dynamic>{
"margin": widget.marginPct
};
return PlatformViewLink(
viewType: viewType,
surfaceFactory:
(BuildContext context, PlatformViewController controller) {
return AndroidViewSurface(
controller: controller as AndroidViewController,
gestureRecognizers: const <Factory<OneSequenceGestureRecognizer>>{},
hitTestBehavior: PlatformViewHitTestBehavior.opaque,
);
},
onCreatePlatformView: (PlatformViewCreationParams params) {
return PlatformViewsService.initExpensiveAndroidView(
id: params.id,
viewType: viewType,
layoutDirection: TextDirection.ltr,
creationParams: creationParams,
creationParamsCodec: const StandardMessageCodec(),
onFocus: () {
params.onFocusChanged(true);
},
)
..addOnPlatformViewCreatedListener(params.onPlatformViewCreated)
..create();
});
}
}