trcr/lib/qr_code_screen.dart

import 'package:app_settings/app_settings.dart';
import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';

import 'configuration_service.dart';
import 'l10n/app_localizations.dart';

class QrCodeScreen extends StatefulWidget {
  const QrCodeScreen({super.key});

  @override
  State<QrCodeScreen> createState() => _QrCodeScreenState();
}

class _QrCodeScreenState extends State<QrCodeScreen> {
  late final MobileScannerController _controller;
  bool _scanned = false;

  @override
  void initState() {
    super.initState();
    _controller = MobileScannerController();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  void _onDetect(BarcodeCapture capture) async {
    if (_scanned) return;
    final barcode = capture.barcodes.first;
    final rawValue = barcode.rawValue;
    if (rawValue == null) return;
    final uri = Uri.tryParse(rawValue);
    if (uri == null || uri.scheme.isEmpty) return;
    _scanned = true;
    await ConfigurationService.applyUri(uri);
    if (mounted) Navigator.pop(context);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(AppLocalizations.of(context)!.settingsTitle),
        actions: [
          ValueListenableBuilder<MobileScannerState>(
            valueListenable: _controller,
            builder: (context, state, _) {
              return IconButton(
                icon: Icon(
                  state.torchState == TorchState.on
                      ? Icons.flash_on
                      : Icons.flash_off,
                ),
                onPressed: state.torchState == TorchState.unavailable
                    ? null
                    : () => _controller.toggleTorch(),
              );
            },
          ),
        ],
      ),
      body: MobileScanner(
        controller: _controller,
        fit: BoxFit.cover,
        onDetect: _onDetect,
        errorBuilder: (context, error) {
          return Center(
            child: Padding(
              padding: const EdgeInsets.all(24.0),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  const Icon(Icons.videocam_off_outlined, size: 64),
                  const SizedBox(height: 16),
                  Text(
                    error.errorCode == MobileScannerErrorCode.permissionDenied
                        ? "Camera Permission Has Been Denied"
                        : error.errorDetails?.message ?? "Camera Error",
                    textAlign: TextAlign.center,
                    style: Theme.of(context).textTheme.bodyLarge,
                  ),
                  const SizedBox(height: 24),
                  FilledButton.icon(
                    onPressed:
                        () => AppSettings.openAppSettings(
                          type: AppSettingsType.settings,
                        ),
                    icon: const Icon(Icons.settings),
                    label: Text("Open Settings"),
                  ),
                ],
              ),
            ),
          );
        },
      ),
    );
  }
}