Alejandro Lara
62 lines
1.6 KiB
Dart
62 lines
1.6 KiB
Dart
import 'dart:async';
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import 'dart:io';
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import 'package:flutter/foundation.dart';
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import 'package:flutter/services.dart';
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class ScanLaunchService {
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ScanLaunchService._();
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static final ScanLaunchService instance = ScanLaunchService._();
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static const _methodChannel = MethodChannel('com.example.qrscanner/scan_launch');
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static const _eventChannel = EventChannel('com.example.qrscanner/scan_events');
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Stream<String>? _scanStream;
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bool get isAndroid => !kIsWeb && Platform.isAndroid;
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Stream<String> get scanStream {
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_scanStream ??= _eventChannel
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.receiveBroadcastStream()
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.where((event) => event is String && event.trim().isNotEmpty)
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.map((event) => (event as String).trim());
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return _scanStream!;
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}
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Future<bool> isSupported() async {
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if (!isAndroid) return false;
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try {
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final supported = await _methodChannel.invokeMethod<bool>('isSupported');
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return supported ?? false;
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} catch (_) {
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return false;
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}
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}
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Future<void> claimScanner() async {
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if (!isAndroid) return;
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try {
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await _methodChannel.invokeMethod<void>('claimScanner');
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} catch (_) {}
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}
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Future<void> releaseScanner() async {
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if (!isAndroid) return;
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try {
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await _methodChannel.invokeMethod<void>('releaseScanner');
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} catch (_) {}
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}
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Future<String?> consumePendingScan() async {
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if (!isAndroid) return null;
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try {
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final code = await _methodChannel.invokeMethod<String>('consumePendingScan');
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final trimmed = code?.trim();
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if (trimmed == null || trimmed.isEmpty) return null;
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return trimmed;
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} catch (_) {
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return null;
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}
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}
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} |