Johandrex
commented
2 years ago Here's the QrScanner widget code, right now I'm using shownPermissionDenied to prevent multiple dialog openings. But as you can see in the video, the top and lower bar is glitching..
https://user-images.githubusercontent.com/8752172/174981905-2db1917f-8368-415d-8636-1fdc2e581b86.mp4
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:hdd/helpers/config.dart';
import 'package:hdd/widgets/app_custom_dialog_box.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:qr_code_scanner/qr_code_scanner.dart';
// ignore: must_be_immutable
class QrScanner extends StatelessWidget {
final GlobalKey<FormState> formKey;
final Function qrCallbackFunction;
QRViewController? controller;
// permission display
bool shownPermissionDenied = false;
final String? description;
final String? declineText;
final Function? declineAction;
QrScanner({Key? key, required this.formKey, this.controller, required this.qrCallbackFunction, this.description, this.declineText, this.declineAction}) : super(key: key);
@override
Widget build(BuildContext context) {
return QRView(
formatsAllowed: const [BarcodeFormat.code128, BarcodeFormat.code39],
key: formKey,
onQRViewCreated: _onQRViewCreated,
onPermissionSet: (ctrl, p) async {
if (!shownPermissionDenied) {
await _onPermissionDenied(context, ctrl, p);
}
},
);
}
void resumeCamera() {
if (Platform.isAndroid) {
controller?.pauseCamera();
}
controller?.resumeCamera();
}
void _onQRViewCreated(QRViewController _controller) {
controller = _controller;
resumeCamera();
controller!.scannedDataStream.listen((scanData) async {
await qrCallbackFunction(scanData.code.toString());
});
}
Future<void> _onPermissionDenied(BuildContext context, QRViewController ctrl, bool p) async {
if (!p) {
showDialog(
barrierDismissible: false,
context: context,
builder: (BuildContext context) {
return CustomDialogBox(
dialogType: DialogType.CONFIRM,
title: 'No Camera Access',
description: (description != null) ? description : Config.NO_CAMERA_ACCESS,
acceptText: 'Settings',
declineText: (declineText != null) ? declineText : 'Close',
declineAction: (declineAction != null) ? declineAction : null,
acceptAction: openAppSettings,
);
},
);
}
shownPermissionDenied = true;
}
}
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Describe the bug When the user doesn't have permission to access the camera onPermissionSet is executed multiple times (like 30 times a second)
Flutter information
Device (please complete the following information):