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esc_pos_print_plus
Commit a0a71a25 authored by Andrey's avatar Andrey
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Print multiple times.

parent 883a2aac
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Showing with 113 additions and 90 deletions
example/blue/lib/main.dart
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import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter_bluetooth_basic/flutter_bluetooth_basic.dart';
......@@ -29,51 +30,85 @@ class MyHomePage extends StatefulWidget {
class _MyHomePageState extends State<MyHomePage> {
BluetoothManager bluetoothManager = BluetoothManager.instance;
bool _connected = false;
bool _isScanning = false;
List<BluetoothDevice> _devices = [];
StreamSubscription _scanResultsSubscription;
StreamSubscription _isScanningSubscription;
// Buffers used for rescan before sending the data
List<BluetoothDevice> _bufDevices = [];
StreamSubscription _bufScanSubscription;
// StreamSubscription _isScanningSubscription;
Future sleep3() {
return Future<dynamic>.delayed(const Duration(seconds: 7), () => "1");
}
void _startScanDevices() {
setState(() {
_devices = [];
});
void _testPrint(BluetoothDevice printer) async {
// print('Test print.... name: ${printer.name}');
if (printer != null && printer.address != null) {
// Connect
await bluetoothManager.connect(printer);
bluetoothManager.startScan(timeout: Duration(seconds: 4));
// Subscribe to the events
bluetoothManager.state.listen((state) async {
// print('**************cur device status: $state');
switch (state) {
case BluetoothManager.CONNECTED:
print('********************* CONNECTED');
// to avoid double call
if (!_connected) {
print('@@@@SEND DATA......');
final List<int> bytes = latin1.encode('test!\n\n\n').toList();
await bluetoothManager.writeData(bytes);
// print('################## print send #############');
// bluetoothManager.
}
sleep3().then((dynamic printer) async {
print('@@@@DISCONNECTING......');
await bluetoothManager.disconnect();
});
_scanResultsSubscription =
bluetoothManager.scanResults.listen((devices) async {
setState(() {
_devices = devices;
});
});
_connected = true;
break;
case BluetoothManager.DISCONNECTED:
print('********************* DISCONNECTED');
_connected = false;
break;
default:
break;
}
_isScanningSubscription =
bluetoothManager.isScanning.listen((isScanningCurrent) async {
// if isScanning value changed (scan just stopped)
if (_isScanning && !isScanningCurrent) {
_scanResultsSubscription.cancel();
_isScanningSubscription.cancel();
}
setState(() {
_isScanning = isScanningCurrent;
});
});
}
// TODO show message "Data sent"
} else {
// TODO show message "Can't connect to the device"
}
void _stopScanDevices() {
bluetoothManager.stopScan();
}
Future _sleep(int seconds) {
return Future<dynamic>.delayed(Duration(seconds: seconds));
}
void _testPrint(BluetoothDevice printer) async {
// We have to rescan before connecting, otherwise we can connect only once
await bluetoothManager.startScan(timeout: Duration(seconds: 1));
await bluetoothManager.stopScan();
// Connect
await bluetoothManager.connect(printer);
// Subscribe to the events
bluetoothManager.state.listen((state) async {
switch (state) {
case BluetoothManager.CONNECTED:
print('********************* CONNECTED');
// to avoid double call
if (!_connected) {
print('@@@@SEND DATA......');
final List<int> bytes = latin1.encode('test!\n\n\n').toList();
await bluetoothManager.writeData(bytes);
// TODO show message "Data sent"
}
// TODO sending disconnect signal should be event-based
_sleep(3).then((dynamic printer) async {
print('@@@@DISCONNECTING......');
await bluetoothManager.disconnect();
});
_connected = true;
break;
case BluetoothManager.DISCONNECTED:
print('********************* DISCONNECTED');
_connected = false;
break;
default:
break;
}
});
}
@override
......@@ -82,65 +117,53 @@ class _MyHomePageState extends State<MyHomePage> {
appBar: AppBar(
title: Text(widget.title),
),
body: StreamBuilder<List<BluetoothDevice>>(
stream: bluetoothManager.scanResults,
initialData: [],
builder: (c, snapshot) => Column(
children: snapshot.data
.map((d) => InkWell(
onTap: () => _testPrint(d),
child: Column(
body: ListView.builder(
itemCount: _devices.length,
itemBuilder: (BuildContext context, int index) {
return InkWell(
onTap: () => _testPrint(_devices[index]),
child: Column(
children: <Widget>[
Container(
height: 60,
padding: EdgeInsets.only(left: 10),
alignment: Alignment.centerLeft,
child: Row(
children: <Widget>[
Container(
height: 60,
padding: EdgeInsets.only(left: 10),
alignment: Alignment.centerLeft,
child: Row(
Icon(Icons.print),
SizedBox(width: 10),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Icon(Icons.print),
SizedBox(width: 10),
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(d.name ?? ''),
Text(d.address),
Text(
'Click to print a test receipt',
style: TextStyle(color: Colors.grey[700]),
),
],
),
)
Text(_devices[index].name ?? ''),
Text(_devices[index].address),
Text(
'Click to print a test receipt',
style: TextStyle(color: Colors.grey[700]),
),
],
),
),
Divider(),
)
],
),
))
.toList(),
),
),
floatingActionButton: StreamBuilder<bool>(
stream: bluetoothManager.isScanning,
initialData: false,
builder: (c, snapshot) {
if (snapshot.data) {
return FloatingActionButton(
),
Divider(),
],
),
);
}),
floatingActionButton: _isScanning
? FloatingActionButton(
child: Icon(Icons.stop),
onPressed: () => bluetoothManager.stopScan(),
onPressed: _stopScanDevices,
backgroundColor: Colors.red,
);
} else {
return FloatingActionButton(
child: Icon(Icons.search),
onPressed: () =>
bluetoothManager.startScan(timeout: Duration(seconds: 4)));
}
},
),
)
: FloatingActionButton(
child: Icon(Icons.search),
onPressed: _startScanDevices,
),
);
}
}
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