nexgo_flutter 0.1.0

nexgo_flutter: ^0.1.0 copied to clipboard

example/lib/main.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:nexgo_flutter/nexgo_flutter.dart';

void main() => runApp(const MyApp());

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

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  final _pos = NexgoPos.instance;
  StreamSubscription<CardInfo>? _cardSub;

  String _status = 'Not initialized';
  DeviceInfo? _info;
  CardInfo? _card;

  @override
  void dispose() {
    _cardSub?.cancel();
    _emvSub?.cancel();
    super.dispose();
  }

  Future<void> _init() async {
    try {
      await _pos.initialize();
      final info = await _pos.getDeviceInfo();
      setState(() {
        _info = info;
        _status = 'Initialized';
      });
    } on NexgoException catch (e) {
      setState(() => _status = 'Init failed: $e');
    }
  }

  Future<void> _printSample() async {
    try {
      await _pos.printReceipt([
        PrintBlock.text(
          'DEMO STORE',
          fontSize: 32,
          bold: true,
          align: PrintAlign.center,
        ),
        PrintBlock.text('Thank you!', align: PrintAlign.center),
        PrintBlock.text('Total: 250.00 ETB', fontSize: 28, bold: true),
        PrintBlock.qr('https://example.com/receipt/1001'),
      ]);
      setState(() => _status = 'Printed');
    } on NexgoException catch (e) {
      setState(() => _status = 'Print failed: $e');
    }
  }

  void _readCard() {
    _cardSub?.cancel();
    setState(() => _status = 'Present card…');
    _cardSub = _pos.searchCard().listen((card) {
      setState(() {
        _card = card;
        _status = 'Card read';
      });
      _cardSub?.cancel();
    }, onError: (e) => setState(() => _status = 'Card error: $e'));
  }

  StreamSubscription<EmvEvent>? _emvSub;

  /// Minimal EMV purchase for 250.00, auto-approving the online step.
  /// A real integration loads AIDs/CAPKs first and calls its host at [EmvOnlineRequest].
  void _startEmv() {
    _emvSub?.cancel();
    setState(() => _status = 'EMV: insert/tap card…');
    final config = EmvConfig(
      amount: '25000',
      entryMode: EmvEntryMode.contact,
      forceOnline: true,
    );
    _emvSub = _pos.startTransaction(config).listen((event) async {
      switch (event) {
        case EmvSelectApp(:final apps):
          setState(() => _status = 'EMV: selecting ${apps.first}');
          await _pos.emvSelectApp(0);
        case EmvConfirmCard(:final card):
          setState(() => _status = 'EMV: card ${card.maskCardNo}');
          await _pos.emvConfirmCard(true);
        case EmvOnlineRequest(:final field55):
          setState(() => _status = 'EMV: going online…');
          // Authorize with your host using field55/pinBlock/ksn here.
          await _pos.emvSubmitOnline(
            OnlineDecision.approve(authCode: '123456', field55Hex: field55),
          );
        case EmvFinish(:final code):
          setState(() => _status = 'EMV finished: code $code');
          _emvSub?.cancel();
        case EmvPrompt(:final prompt):
          setState(() => _status = 'EMV prompt: $prompt');
        default:
          break; // pinEntry / tapCardAgain / removeCard are auto-handled
      }
    }, onError: (e) => setState(() => _status = 'EMV error: $e'));
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('nexgo_flutter example')),
        body: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Text('Status: $_status'),
              const SizedBox(height: 8),
              if (_info != null) Text('Device: ${_info!}'),
              if (_card != null) Text('Card: ${_card!}'),
              const Spacer(),
              FilledButton(onPressed: _init, child: const Text('Initialize')),
              FilledButton(
                onPressed: () => _pos.beep(),
                child: const Text('Beep'),
              ),
              FilledButton(
                onPressed: () => _pos.setLed(LedColor.green, on: true),
                child: const Text('Green LED on'),
              ),
              FilledButton(
                onPressed: _printSample,
                child: const Text('Print sample receipt'),
              ),
              FilledButton(
                onPressed: _readCard,
                child: const Text('Read card'),
              ),
              FilledButton(
                onPressed: _startEmv,
                child: const Text('Start EMV purchase (250.00)'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}