pda608_scanner_printer 0.0.1

A Flutter plugin for PDA608 device thermal printer and barcode scanner.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'package:pda608_scanner_printer/pda608_scanner_printer.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});  // Pass 'key' directly to the parent class

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'PDA608 Tester',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        useMaterial3: true,
      ),
      home: const PDA608Tester(),
    );
  }
}

class PDA608Tester extends StatefulWidget {
  const PDA608Tester({super.key});  // Pass 'key' directly to the parent class

  @override
  State<PDA608Tester> createState() => _PDA608TesterState();
}


class _PDA608TesterState extends State<PDA608Tester> {
  String _status = 'Not initialized';
  bool _isInitialized = false;
  bool _isLoading = false;
  String _lastScannedBarcode = '';

  // Print options
  final TextEditingController _textController = TextEditingController(
      text: 'Test print from Flutter'
  );
  int _selectedFontSize = 0; // 0 = normal, 1 = large
  int _selectedAlignment = 1; // 0 = left, 1 = center, 2 = right

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

    // Setup a listener for barcode scan events - CRUCIAL FOR SCAN EVENTS
    Pda608ScannerPrinter.onBarcodeScanned.listen((barcode) {
      debugPrint('Barcode received in Flutter UI: $barcode');
      setState(() {
        _lastScannedBarcode = barcode;
        _status = 'Barcode scanned: $barcode';
      });
    });
  }

  @override
  void dispose() {
    _textController.dispose();
    Pda608ScannerPrinter.dispose();
    super.dispose();
  }

  Future<void> _initializePrinter() async {
    setState(() {
      _isLoading = true;
      _status = 'Initializing...';
    });

    try {
      bool initialized = await Pda608ScannerPrinter.initializePrinter();
      debugPrint("Printer initialized: $initialized");

      setState(() {
        _isInitialized = initialized;
        _status = initialized ? 'Initialized successfully' : 'Failed to initialize';
      });
    } catch (e) {
      setState(() {
        _status = 'Error: ${e.toString()}';
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<void> _printText() async {
    if (!_isInitialized) {
      setState(() {
        _status = 'Please initialize the printer first';
      });
      return;
    }

    setState(() {
      _isLoading = true;
      _status = 'Printing...';
    });

    try {
      // Use the enhanced plugin with formatting parameters
      bool printed = await Pda608ScannerPrinter.printText(
        text: _textController.text,
        fontSize: _selectedFontSize,
        alignment: _selectedAlignment,
        paperWidth: 52, // Standard width for PDA608
        isLabel: false,
        tearPaper: true,
      );
      debugPrint("Text printed: $printed");

      setState(() {
        _status = printed ? 'Text printed successfully' : 'Failed to print text';
      });
    } catch (e) {
      setState(() {
        _status = 'Error: ${e.toString()}';
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Widget _buildPrinterOptions() {
    return Card(
      margin: const EdgeInsets.all(8.0),
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text('Printer Options', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
            const SizedBox(height: 16),

            TextField(
              controller: _textController,
              decoration: const InputDecoration(
                labelText: 'Text to Print',
                border: OutlineInputBorder(),
              ),
              maxLines: 3,
            ),
            const SizedBox(height: 16),

            // Fix the overflow by using a Wrap widget instead of Row
            Wrap(
              spacing: 8,
              children: [
                const Text('Font Size:', style: TextStyle(fontWeight: FontWeight.bold)),
                ChoiceChip(
                  label: const Text('Normal'),
                  selected: _selectedFontSize == 0,
                  onSelected: (selected) {
                    if (selected) {
                      setState(() {
                        _selectedFontSize = 0;
                      });
                    }
                  },
                ),
                ChoiceChip(
                  label: const Text('Large'),
                  selected: _selectedFontSize == 1,
                  onSelected: (selected) {
                    if (selected) {
                      setState(() {
                        _selectedFontSize = 1;
                      });
                    }
                  },
                ),
              ],
            ),
            const SizedBox(height: 16),

            // Fix the overflow by using a Wrap widget instead of Row
            Wrap(
              spacing: 8,
              children: [
                const Text('Alignment:', style: TextStyle(fontWeight: FontWeight.bold)),
                ChoiceChip(
                  label: const Text('Left'),
                  selected: _selectedAlignment == 0,
                  onSelected: (selected) {
                    if (selected) {
                      setState(() {
                        _selectedAlignment = 0;
                      });
                    }
                  },
                ),
                ChoiceChip(
                  label: const Text('Center'),
                  selected: _selectedAlignment == 1,
                  onSelected: (selected) {
                    if (selected) {
                      setState(() {
                        _selectedAlignment = 1;
                      });
                    }
                  },
                ),
                ChoiceChip(
                  label: const Text('Right'),
                  selected: _selectedAlignment == 2,
                  onSelected: (selected) {
                    if (selected) {
                      setState(() {
                        _selectedAlignment = 2;
                      });
                    }
                  },
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildScannerSection() {
    return Card(
      margin: const EdgeInsets.all(8.0),
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text('Barcode Scanner', style: TextStyle(fontSize: 18, fontWeight: FontWeight.bold)),
            const SizedBox(height: 16),

            Container(
              padding: const EdgeInsets.all(10),
              decoration: BoxDecoration(
                border: Border.all(color: Colors.grey),
                borderRadius: BorderRadius.circular(5),
                color: _lastScannedBarcode.isEmpty ? Colors.white : Colors.green.shade50,
              ),
              child: Row(
                children: [
                  Expanded(
                    child: Text(
                      _lastScannedBarcode.isEmpty ? 'No barcode scanned yet' : _lastScannedBarcode,
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: _lastScannedBarcode.isEmpty ? FontWeight.normal : FontWeight.bold,
                        color: _lastScannedBarcode.isEmpty ? Colors.grey.shade600 : Colors.black,
                      ),
                    ),
                  ),
                  if (_lastScannedBarcode.isNotEmpty)
                    IconButton(
                      icon: const Icon(Icons.copy),
                      tooltip: 'Copy barcode',
                      onPressed: () {
                        // Copy to clipboard functionality could be added here
                        setState(() {
                          _status = 'Barcode copied to clipboard';
                        });
                      },
                    ),
                ],
              ),
            ),
            const SizedBox(height: 16),

            ElevatedButton.icon(
              onPressed: _isInitialized ? () async {
                setState(() {
                  _status = 'Activating barcode scanner...';
                  _isLoading = true;
                });

                try {
                  bool success = await Pda608ScannerPrinter.startScan();
                  setState(() {
                    _status = success ? 'Barcode scanner activated - please scan a barcode' : 'Failed to activate scanner';
                  });
                } catch (e) {
                  setState(() {
                    _status = 'Scanner error: ${e.toString()}';
                  });
                } finally {
                  setState(() {
                    _isLoading = false;
                  });
                }
              } : null,
              icon: const Icon(Icons.qr_code_scanner),
              label: const Text('Activate Scanner'),
              style: ElevatedButton.styleFrom(
                backgroundColor: Colors.green,
                foregroundColor: Colors.white,
                padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 16),
              ),
            ),
          ],
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('PDA608 Scanner & Printer Test'),
        backgroundColor: Colors.blue,
        foregroundColor: Colors.white,
      ),
      body: _isLoading
          ? const Center(child: CircularProgressIndicator())
          : RefreshIndicator(
        onRefresh: _initializePrinter,
        child: SingleChildScrollView(
          physics: const AlwaysScrollableScrollPhysics(),
          padding: const EdgeInsets.all(16.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              Card(
                color: _isInitialized ? Colors.green.shade100 : Colors.orange.shade100,
                child: Padding(
                  padding: const EdgeInsets.all(16.0),
                  child: Column(
                    children: [
                      Text(
                        'Status: $_status',
                        style: const TextStyle(fontSize: 16),
                      ),
                      const SizedBox(height: 8),
                      Text(
                        'Printer: ${_isInitialized ? 'Initialized' : 'Not Initialized'}',
                        style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                          color: _isInitialized ? Colors.green.shade800 : Colors.orange.shade800,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              const SizedBox(height: 16),

              // Make sure buttons are responsive
              Wrap(
                spacing: 8,
                runSpacing: 8,
                alignment: WrapAlignment.center,
                children: [
                  ElevatedButton.icon(
                    onPressed: _initializePrinter,
                    icon: const Icon(Icons.power_settings_new),
                    label: const Text('Initialize'),
                    style: ElevatedButton.styleFrom(
                      padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 20),
                      minimumSize: Size(MediaQuery.of(context).size.width * 0.4, 50),
                    ),
                  ),
                  ElevatedButton.icon(
                    onPressed: _isInitialized ? _printText : null,
                    icon: const Icon(Icons.print),
                    label: const Text('Print'),
                    style: ElevatedButton.styleFrom(
                      padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 20),
                      minimumSize: Size(MediaQuery.of(context).size.width * 0.4, 50),
                      backgroundColor: _isInitialized ? Colors.blue : Colors.grey,
                      foregroundColor: Colors.white,
                    ),
                  ),
                ],
              ),

              const SizedBox(height: 16),
              _buildPrinterOptions(),
              const SizedBox(height: 16),
              _buildScannerSection(),
            ],
          ),
        ),
      ),
    );
  }
}