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Tothemax Dev
195
lib/print/bluetooth_printer_screen.dart
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195
lib/print/bluetooth_printer_screen.dart
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:drago_pos_printer/drago_pos_printer.dart';
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import 'package:webcontent_converter/demo.dart';
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import 'package:webcontent_converter/webcontent_converter.dart';
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import '../service/service.dart';
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class BluetoothPrinterScreen extends StatefulWidget {
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@override
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_BluetoothPrinterScreenState createState() => _BluetoothPrinterScreenState();
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}
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class _BluetoothPrinterScreenState extends State<BluetoothPrinterScreen> {
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bool _isLoading = false;
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List<BluetoothPrinter> _printers = [];
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BluetoothPrinterManager? _manager;
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int paperWidth = 0;
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int charPerLine = 0;
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List<String> paperTypes = [];
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bool showCustom = false;
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@override
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void initState() {
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_scan();
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paperWidth = PaperSizeWidth.mm80;
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charPerLine = PaperSizeMaxPerLine.mm80;
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paperTypes.add('58mm');
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paperTypes.add('80mmOld');
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paperTypes.add('80mm');
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paperTypes.add('Custom');
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super.initState();
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text("Bluetooth Printer Screen"),
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),
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body: ListView(
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padding: EdgeInsets.all(20),
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children: [
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DropdownButtonHideUnderline(
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child: DropdownButtonFormField(
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decoration: InputDecoration(labelText: 'Paper Size'),
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items: paperTypes.map((item) {
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return DropdownMenuItem(
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value: item,
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child: Text(item),
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);
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}).toList(),
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onChanged: (String? selected) async {
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showCustom = false;
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if (selected != null) {
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if (selected == "58mm") {
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paperWidth = PaperSizeWidth.mm58;
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charPerLine = PaperSizeMaxPerLine.mm58;
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} else if (selected == "80mmOld") {
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paperWidth = PaperSizeWidth.mm80_Old;
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charPerLine = PaperSizeMaxPerLine.mm80_Old;
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} else if (selected == "80mm") {
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paperWidth = PaperSizeWidth.mm80;
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charPerLine = PaperSizeMaxPerLine.mm80;
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} else if (selected == "Custom") {
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paperWidth = PaperSizeWidth.mm80;
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charPerLine = PaperSizeMaxPerLine.mm80;
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showCustom = true;
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}
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setState(() {});
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}
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},
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),
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),
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if (showCustom)
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Row(
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children: [
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Expanded(
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child: TextFormField(
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initialValue: paperWidth.toString(),
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onChanged: (val) {
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if (val.isNotEmpty) {
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paperWidth = int.parse(val);
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} else
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paperWidth = 0;
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},
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)),
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SizedBox(width: 20),
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Expanded(
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child: TextFormField(
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initialValue: charPerLine.toString(),
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onChanged: (val) {
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if (val.isNotEmpty) {
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charPerLine = int.parse(val);
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} else
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charPerLine = 0;
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},
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))
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],
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),
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SizedBox(height: 10),
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..._printers
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.map((printer) => ListTile(
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title: Text("${printer.name}"),
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subtitle: Text("${printer.address}"),
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leading: Icon(Icons.bluetooth),
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onTap: () => _connect(printer),
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trailing: printer.connected
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? Wrap(
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children: [
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IconButton(
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tooltip: 'ESC POS Command',
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onPressed: () => _startPrinter(1, printer),
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icon: Icon(Icons.print)),
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IconButton(
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tooltip: 'Html Print',
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onPressed: () => _startPrinter(3, printer),
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icon: Icon(Icons.image)),
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],
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)
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: null,
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selected: printer.connected,
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))
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.toList(),
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],
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),
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floatingActionButton: FloatingActionButton(
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child: _isLoading ? Icon(Icons.stop) : Icon(Icons.play_arrow),
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onPressed: _isLoading ? null : _scan,
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),
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);
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}
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_scan() async {
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print("scan");
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setState(() {
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_isLoading = true;
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_printers = [];
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});
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var printers = await BluetoothPrinterManager.discover();
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print(printers);
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setState(() {
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_isLoading = false;
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_printers = printers;
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});
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}
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Future _connect(BluetoothPrinter printer) async {
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var manager = BluetoothPrinterManager(printer);
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// await manager.connect();
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print(" -==== connected =====- ");
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setState(() {
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_manager = manager;
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printer.connected = true;
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});
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}
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_startPrinter(int byteType, BluetoothPrinter printer) async {
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var profile = await CapabilityProfile.load();
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await _connect(printer);
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late List<int> data;
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if (byteType == 1) {
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data = await ESCPrinterService(null).getSamplePosBytes(
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paperSizeWidthMM: paperWidth,
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maxPerLine: charPerLine,
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profile: profile);
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} else if (byteType == 2) {
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data = await ESCPrinterService(null).getPdfBytes(
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paperSizeWidthMM: paperWidth,
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maxPerLine: charPerLine,
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profile: profile);
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} else if (byteType == 3) {
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final content = Demo.getShortReceiptContent();
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Uint8List? htmlBytes = await WebcontentConverter.contentToImage(
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content: content,
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executablePath: WebViewHelper.executablePath(),
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);
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var service = ESCPrinterService(htmlBytes);
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data = await service.getBytes(
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paperSizeWidthMM: paperWidth,
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maxPerLine: charPerLine,
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profile: profile);
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}
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if (_manager != null) {
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if (!await _manager!.checkConnected()) await _manager!.connect();
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_manager!.writeBytes(data, isDisconnect: true);
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}
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}
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}
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