feat: USB Printers

lib/esc_pos_printer.dart

@@ -9,3 +9,4 @@ library esc_pos_printer;
 
 export './src/enums.dart';
 export './src/printer_network_manager.dart';
+export './src/printer_usb_manager.dart';

lib/src/printer_usb_manager.dart

@@ -0,0 +1,33 @@
+import 'dart:async';
+import 'dart:io';
+import 'package:esc_pos_utils/esc_pos_utils.dart';
+import 'package:escposprinter/escposprinter.dart';
+
+import './enums.dart';
+
+class PrinterUsbManager {
+
+  Future<List> getDevices() async {
+    List devices = await Escposprinter.getUSBDeviceList;
+    return devices;
+  }
+
+  Future<void> connectDevice(int vendor, int product) async {
+    await Escposprinter.connectPrinter(vendor, product);
+    return;
+  }
+
+  Future<PosPrintResult> writeBytes(List<int> bytes) async {
+    final Completer<PosPrintResult> completer = Completer();
+    await Escposprinter.printBytes(bytes);
+    completer.complete(PosPrintResult.success);
+    return completer.future;
+  }
+
+  Future<PosPrintResult> printTicket(Ticket ticket) {
+    if (ticket == null || ticket.bytes.isEmpty) {
+      return Future<PosPrintResult>.value(PosPrintResult.ticketEmpty);
+    }
+    return writeBytes(ticket.bytes);
+  }
+}

pubspec.yaml

@@ -10,6 +10,8 @@ dependencies:
   flutter:
     sdk: flutter
   esc_pos_utils: ^0.3.5
+  escposprinter:
+    git: https://github.com/bailabs/esc-pos-printer-flutter
   # esc_pos_utils:
     # path: ../esc_pos_utils