maswend_pos_printer_platform 1.0.2 
maswend_pos_printer_platform: ^1.0.2 copied to clipboard
A flutter plugin that prints esc commands to printers in different platforms such as android, ios, windows and different interfaces Bluetooth and BLE, TCP and USB
import 'dart:async';
import 'dart:developer';
import 'dart:io';
import 'package:esc_pos_utils/esc_pos_utils.dart';
import 'package:flutter/material.dart';
import 'package:maswend_pos_printer_platform/maswend_pos_printer_platform.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({Key? key}) : super(key: key);
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
// Printer Type [bluetooth, usb, network]
var defaultPrinterType = PrinterType.bluetooth;
var _isBle = false;
var _reconnect = false;
var _isConnected = false;
var printerManager = PrinterManager.instance;
var devices = <BluetoothPrinter>[];
StreamSubscription<PrinterDevice>? _subscription;
StreamSubscription<BTStatus>? _subscriptionBtStatus;
StreamSubscription<USBStatus>? _subscriptionUsbStatus;
BTStatus _currentStatus = BTStatus.none;
// _currentUsbStatus is only supports on Android
USBStatus _currentUsbStatus = USBStatus.none;
List<int>? pendingTask;
String _ipAddress = '';
String _port = '9100';
final _ipController = TextEditingController();
final _portController = TextEditingController();
BluetoothPrinter? selectedPrinter;
@override
void initState() {
if (Platform.isWindows) defaultPrinterType = PrinterType.usb;
super.initState();
_portController.text = _port;
_scan();
// subscription to listen change status of bluetooth connection
_subscriptionBtStatus =
PrinterManager.instance.stateBluetooth.listen((status) {
log(' ----------------- status bt $status ------------------ ');
_currentStatus = status;
if (status == BTStatus.connected) {
setState(() {
_isConnected = true;
});
}
if (status == BTStatus.none) {
setState(() {
_isConnected = false;
});
}
if (status == BTStatus.connected && pendingTask != null) {
if (Platform.isAndroid) {
Future.delayed(const Duration(milliseconds: 1000), () {
PrinterManager.instance
.send(type: PrinterType.bluetooth, bytes: pendingTask!);
pendingTask = null;
});
} else if (Platform.isIOS) {
PrinterManager.instance
.send(type: PrinterType.bluetooth, bytes: pendingTask!);
pendingTask = null;
}
}
});
// PrinterManager.instance.stateUSB is only supports on Android
_subscriptionUsbStatus = PrinterManager.instance.stateUSB.listen((status) {
log(' ----------------- status usb $status ------------------ ');
_currentUsbStatus = status;
if (Platform.isAndroid) {
if (status == USBStatus.connected && pendingTask != null) {
Future.delayed(const Duration(milliseconds: 1000), () {
PrinterManager.instance
.send(type: PrinterType.usb, bytes: pendingTask!);
pendingTask = null;
});
}
}
});
}
@override
void dispose() {
_subscription?.cancel();
_subscriptionBtStatus?.cancel();
_subscriptionUsbStatus?.cancel();
_portController.dispose();
_ipController.dispose();
super.dispose();
}
// method to scan devices according PrinterType
void _scan() {
devices.clear();
_subscription = printerManager
.discovery(type: defaultPrinterType, isBle: _isBle)
.listen((device) {
devices.add(BluetoothPrinter(
deviceName: device.name,
address: device.address,
isBle: _isBle,
vendorId: device.vendorId,
productId: device.productId,
typePrinter: defaultPrinterType,
));
setState(() {});
});
}
void setPort(String value) {
if (value.isEmpty) value = '9100';
_port = value;
var device = BluetoothPrinter(
deviceName: value,
address: _ipAddress,
port: _port,
typePrinter: PrinterType.network,
state: false,
);
selectDevice(device);
}
void setIpAddress(String value) {
_ipAddress = value;
var device = BluetoothPrinter(
deviceName: value,
address: _ipAddress,
port: _port,
typePrinter: PrinterType.network,
state: false,
);
selectDevice(device);
}
void selectDevice(BluetoothPrinter device) async {
if (selectedPrinter != null) {
if ((device.address != selectedPrinter!.address) ||
(device.typePrinter == PrinterType.usb &&
selectedPrinter!.vendorId != device.vendorId)) {
await PrinterManager.instance
.disconnect(type: selectedPrinter!.typePrinter);
}
}
selectedPrinter = device;
setState(() {});
}
Future _printReceiveTest() async {
final profile = await CapabilityProfile.load();
final generator = Generator(PaperSize.mm58, profile);
List<int> bytes = [];
bytes += generator.text('Test Print',
styles: const PosStyles(align: PosAlign.center));
bytes += generator.text('Product 1');
bytes += generator.text('Product 2');
_printEscPos(bytes, generator);
}
/// print ticket
void _printEscPos(List<int> bytes, Generator generator) async {
if (selectedPrinter == null) return;
var bluetoothPrinter = selectedPrinter!;
switch (bluetoothPrinter.typePrinter) {
case PrinterType.usb:
bytes += generator.feed(2);
bytes += generator.cut();
await printerManager.connect(
type: bluetoothPrinter.typePrinter,
model: UsbPrinterInput(
name: bluetoothPrinter.deviceName,
productId: bluetoothPrinter.productId,
vendorId: bluetoothPrinter.vendorId));
pendingTask = null;
if (Platform.isAndroid) pendingTask = bytes;
break;
case PrinterType.bluetooth:
bytes += generator.cut();
await printerManager.connect(
type: bluetoothPrinter.typePrinter,
model: BluetoothPrinterInput(
name: bluetoothPrinter.deviceName,
address: bluetoothPrinter.address!,
isBle: bluetoothPrinter.isBle ?? false,
autoConnect: _reconnect));
pendingTask = null;
if (Platform.isIOS || Platform.isAndroid) pendingTask = bytes;
break;
case PrinterType.network:
bytes += generator.feed(2);
bytes += generator.cut();
await printerManager.connect(
type: bluetoothPrinter.typePrinter,
model: TcpPrinterInput(ipAddress: bluetoothPrinter.address!));
break;
default:
}
if (bluetoothPrinter.typePrinter == PrinterType.bluetooth) {
if (_currentStatus == BTStatus.connected) {
printerManager.send(type: bluetoothPrinter.typePrinter, bytes: bytes);
pendingTask = null;
}
} else if (bluetoothPrinter.typePrinter == PrinterType.usb &&
Platform.isAndroid) {
// _currentUsbStatus is only supports on Android
if (_currentUsbStatus == USBStatus.connected) {
printerManager.send(type: bluetoothPrinter.typePrinter, bytes: bytes);
pendingTask = null;
}
} else {
printerManager.send(type: bluetoothPrinter.typePrinter, bytes: bytes);
}
}
// conectar dispositivo
_connectDevice() async {
_isConnected = false;
if (selectedPrinter == null) return;
switch (selectedPrinter!.typePrinter) {
case PrinterType.usb:
await printerManager.connect(
type: selectedPrinter!.typePrinter,
model: UsbPrinterInput(
name: selectedPrinter!.deviceName,
productId: selectedPrinter!.productId,
vendorId: selectedPrinter!.vendorId));
_isConnected = true;
break;
case PrinterType.bluetooth:
await printerManager.connect(
type: selectedPrinter!.typePrinter,
model: BluetoothPrinterInput(
name: selectedPrinter!.deviceName,
address: selectedPrinter!.address!,
isBle: selectedPrinter!.isBle ?? false,
autoConnect: _reconnect));
break;
case PrinterType.network:
await printerManager.connect(
type: selectedPrinter!.typePrinter,
model: TcpPrinterInput(ipAddress: selectedPrinter!.address!));
_isConnected = true;
break;
default:
}
setState(() {});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Flutter Pos Plugin Platform example app'),
),
body: Center(
child: Container(
height: double.infinity,
constraints: const BoxConstraints(maxWidth: 400),
child: SingleChildScrollView(
padding: EdgeInsets.zero,
child: Column(
children: [
Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Expanded(
child: ElevatedButton(
onPressed: selectedPrinter == null || _isConnected
? null
: () {
_connectDevice();
},
child: const Text("Connect",
textAlign: TextAlign.center),
),
),
const SizedBox(width: 8),
Expanded(
child: ElevatedButton(
onPressed: selectedPrinter == null || !_isConnected
? null
: () {
if (selectedPrinter != null)
printerManager.disconnect(
type: selectedPrinter!.typePrinter);
setState(() {
_isConnected = false;
});
},
child: const Text("Disconnect",
textAlign: TextAlign.center),
),
),
],
),
),
DropdownButtonFormField<PrinterType>(
value: defaultPrinterType,
decoration: const InputDecoration(
prefixIcon: Icon(
Icons.print,
size: 24,
),
labelText: "Type Printer Device",
labelStyle: TextStyle(fontSize: 18.0),
focusedBorder: InputBorder.none,
enabledBorder: InputBorder.none,
),
items: <DropdownMenuItem<PrinterType>>[
if (Platform.isAndroid || Platform.isIOS)
const DropdownMenuItem(
value: PrinterType.bluetooth,
child: Text("bluetooth"),
),
if (Platform.isAndroid || Platform.isWindows)
const DropdownMenuItem(
value: PrinterType.usb,
child: Text("usb"),
),
const DropdownMenuItem(
value: PrinterType.network,
child: Text("Wifi"),
),
],
onChanged: (PrinterType? value) {
setState(() {
if (value != null) {
setState(() {
defaultPrinterType = value;
selectedPrinter = null;
_isBle = false;
_isConnected = false;
_scan();
});
}
});
},
),
Visibility(
visible: defaultPrinterType == PrinterType.bluetooth &&
Platform.isAndroid,
child: SwitchListTile.adaptive(
contentPadding:
const EdgeInsets.only(bottom: 20.0, left: 20),
title: const Text(
"This device supports ble (low energy)",
textAlign: TextAlign.start,
style: TextStyle(fontSize: 19.0),
),
value: _isBle,
onChanged: (bool? value) {
setState(() {
_isBle = value ?? false;
_isConnected = false;
selectedPrinter = null;
_scan();
});
},
),
),
Visibility(
visible: defaultPrinterType == PrinterType.bluetooth &&
Platform.isAndroid,
child: SwitchListTile.adaptive(
contentPadding:
const EdgeInsets.only(bottom: 20.0, left: 20),
title: const Text(
"reconnect",
textAlign: TextAlign.start,
style: TextStyle(fontSize: 19.0),
),
value: _reconnect,
onChanged: (bool? value) {
setState(() {
_reconnect = value ?? false;
});
},
),
),
Column(
children: devices
.map(
(device) => ListTile(
title: Text('${device.deviceName}'),
subtitle: Platform.isAndroid &&
defaultPrinterType == PrinterType.usb
? null
: Visibility(
visible: !Platform.isWindows,
child: Text("${device.address}")),
onTap: () {
// do something
selectDevice(device);
},
leading: selectedPrinter != null &&
((device.typePrinter == PrinterType.usb &&
Platform.isWindows
? device.deviceName ==
selectedPrinter!.deviceName
: device.vendorId != null &&
selectedPrinter!.vendorId ==
device.vendorId) ||
(device.address != null &&
selectedPrinter!.address ==
device.address))
? const Icon(
Icons.check,
color: Colors.green,
)
: null,
trailing: OutlinedButton(
onPressed: selectedPrinter == null ||
device.deviceName !=
selectedPrinter?.deviceName
? null
: () async {
_printReceiveTest();
},
child: const Padding(
padding: EdgeInsets.symmetric(
vertical: 2, horizontal: 20),
child: Text("Print test ticket",
textAlign: TextAlign.center),
),
),
),
)
.toList()),
Visibility(
visible: defaultPrinterType == PrinterType.network &&
Platform.isWindows,
child: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: TextFormField(
controller: _ipController,
keyboardType:
const TextInputType.numberWithOptions(signed: true),
decoration: const InputDecoration(
label: Text("Ip Address"),
prefixIcon: Icon(Icons.wifi, size: 24),
),
onChanged: setIpAddress,
),
),
),
Visibility(
visible: defaultPrinterType == PrinterType.network &&
Platform.isWindows,
child: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: TextFormField(
controller: _portController,
keyboardType:
const TextInputType.numberWithOptions(signed: true),
decoration: const InputDecoration(
label: Text("Port"),
prefixIcon: Icon(Icons.numbers_outlined, size: 24),
),
onChanged: setPort,
),
),
),
Visibility(
visible: defaultPrinterType == PrinterType.network &&
Platform.isWindows,
child: Padding(
padding: const EdgeInsets.only(top: 10.0),
child: OutlinedButton(
onPressed: () async {
if (_ipController.text.isNotEmpty)
setIpAddress(_ipController.text);
_printReceiveTest();
},
child: const Padding(
padding:
EdgeInsets.symmetric(vertical: 4, horizontal: 50),
child: Text("Print test ticket",
textAlign: TextAlign.center),
),
),
),
)
],
),
),
),
),
),
);
}
}
class BluetoothPrinter {
int? id;
String? deviceName;
String? address;
String? port;
String? vendorId;
String? productId;
bool? isBle;
PrinterType typePrinter;
bool? state;
BluetoothPrinter(
{this.deviceName,
this.address,
this.port,
this.state,
this.vendorId,
this.productId,
this.typePrinter = PrinterType.bluetooth,
this.isBle = false});
}Metadata
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Publisher
unverified uploader
Metadata
A flutter plugin that prints esc commands to printers in different platforms such as android, ios, windows and different interfaces Bluetooth and BLE, TCP and USB
Documentation
License
MIT (LICENSE)
Dependencies
enum_to_string, flutter, flutter_star_prnt, image, network_info_plus, ping_discover_network_forked, rxdart
