flutter_sunmi_printer_old 0.0.1

A comprehensive Flutter plugin for Sunmi printer integration. Supports text printing with custom styles, image printing, table/row printing, and provides both original API compatibility and new stream [...]

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter_sunmi_printer_old/flutter_sunmi_printer_old.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 FlutterSunmiPrinterOld _printer = FlutterSunmiPrinterOld();
  String _platformVersion = 'Unknown';
  final GlobalKey<ScaffoldMessengerState> _scaffoldMessengerKey =
      GlobalKey<ScaffoldMessengerState>();

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion =
          await _printer.getPlatformVersion() ?? 'Unknown platform version';
      await _printer.isPrinting();
    } catch (e) {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  void _showSnackBar(String message) {
    _scaffoldMessengerKey.currentState?.showSnackBar(
      SnackBar(content: Text(message)),
    );
  }

  Future<void> _printTestReceipt() async {
    try {
      // Reset printer
      await _printer.reset();

      // Start printing
      await _printer.startPrint();

      // Print header using original API style
      await _printer.text(
        'SUNMI PRINTER TEST',
        styles: SunmiStyles(
          align: SunmiAlign.center,
          bold: true,
          size: SunmiSize.lg,
        ),
        linesAfter: 1,
      );

      // Print separator using hr method
      await _printer.hr(linesAfter: 1);

      // Print some text using original API
      await _printer.text(
        'This is a test receipt',
        styles: SunmiStyles(align: SunmiAlign.left),
        linesAfter: 1,
      );

      // Print a table row using original API
      await _printer.row(
        cols: [
          SunmiCol(text: 'Item', width: 8, align: SunmiAlign.left),
          SunmiCol(text: 'Price', width: 2, align: SunmiAlign.right),
          SunmiCol(text: 'Qty', width: 2, align: SunmiAlign.right),
        ],
        bold: true,
        linesAfter: 1,
      );

      // Print some items using original API
      final items = [
        ['Coffee', '\$3.50', '2'],
        ['Tea', '\$2.00', '1'],
        ['Cake', '\$5.00', '1'],
      ];

      for (final item in items) {
        await _printer.row(
          cols: [
            SunmiCol(text: item[0], width: 8, align: SunmiAlign.left),
            SunmiCol(text: item[1], width: 2, align: SunmiAlign.right),
            SunmiCol(text: item[2], width: 2, align: SunmiAlign.right),
          ],
          linesAfter: 1,
        );
      }

      // Print total using original API
      await _printer.text(
        'Total: \$14.00',
        styles: SunmiStyles(
          align: SunmiAlign.right,
          bold: true,
          size: SunmiSize.md,
        ),
        linesAfter: 2,
      );

      // Print footer
      await _printer.text(
        'Thank you for your purchase!',
        styles: SunmiStyles(align: SunmiAlign.center),
        linesAfter: 2,
      );

      // Stop printing
      await _printer.stopPrint();

      if (!mounted) return;
      _showSnackBar('Print job completed!');
    } catch (e) {
      if (!mounted) return;
      _showSnackBar('Print error: $e');
    }
  }

  Future<void> _printTestReceiptNewAPI() async {
    try {
      // Reset printer
      await _printer.reset();

      // Start printing
      await _printer.startPrint();

      // Print header using new API
      await _printer.printText(
        text: 'SUNMI PRINTER TEST (NEW API)',
        align: 1, // Center
        bold: true,
        size: 36,
        linesAfter: 1,
      );

      // Print separator
      await _printer.printText(
        text: '========================',
        align: 1,
        linesAfter: 1,
      );

      // Print some text
      await _printer.printText(
        text: 'This is a test receipt using new API',
        align: 0, // Left
        linesAfter: 1,
      );

      // Print a table row using new API
      final rowData = [
        {'text': 'Item', 'width': 16, 'align': 0},
        {'text': 'Price', 'width': 8, 'align': 2},
        {'text': 'Qty', 'width': 8, 'align': 2},
      ];

      await _printer.printRow(
        cols: rowData.toString(),
        bold: true,
        linesAfter: 1,
      );

      // Print some items
      final items = [
        ['Coffee', '\$3.50', '2'],
        ['Tea', '\$2.00', '1'],
        ['Cake', '\$5.00', '1'],
      ];

      for (final item in items) {
        final itemData = [
          {'text': item[0], 'width': 16, 'align': 0},
          {'text': item[1], 'width': 8, 'align': 2},
          {'text': item[2], 'width': 8, 'align': 2},
        ];

        await _printer.printRow(cols: itemData.toString(), linesAfter: 1);
      }

      // Print total
      await _printer.printText(
        text: 'Total: \$14.00',
        align: 2, // Right
        bold: true,
        size: 28,
        linesAfter: 2,
      );

      // Print footer
      await _printer.printText(
        text: 'Thank you for your purchase!',
        align: 1,
        linesAfter: 2,
      );

      // Stop printing
      await _printer.stopPrint();

      if (!mounted) return;
      _showSnackBar('Print job completed (New API)!');
    } catch (e) {
      if (!mounted) return;
      _showSnackBar('Print error: $e');
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      scaffoldMessengerKey: _scaffoldMessengerKey,
      home: Scaffold(
        appBar: AppBar(title: const Text('Sunmi Printer Example')),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text('Running on: $_platformVersion\n'),
              const SizedBox(height: 20),
              ElevatedButton(
                onPressed: _printTestReceipt,
                child: const Text('Print Test Receipt (Original API)'),
              ),
              const SizedBox(height: 10),
              ElevatedButton(
                onPressed: _printTestReceiptNewAPI,
                child: const Text('Print Test Receipt (New API)'),
              ),
              const SizedBox(height: 20),
              ElevatedButton(
                onPressed: () async {
                  final isPrinting = await _printer.isPrinting();
                  if (!mounted) return;
                  _showSnackBar('Is printing: $isPrinting');
                },
                child: const Text('Check Print Status'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}