invoice_ticket.dart

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';

Future<void> main() async {
  runApp(const MyApp('Printing Demo'));
}

class MyApp extends StatelessWidget {
  const MyApp(this.title, {Key? key}) : super(key: key);

  final String title;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text(title)),
        body: PdfPreview(
          build: (format) => _generatePdf(format, title),
          maxPageWidth: 400,
        ),
      ),
    );
  }

  Future<Uint8List> _generatePdf(PdfPageFormat format, String title) async {
    final pdf = pw.Document(version: PdfVersion.pdf_1_5, compress: true);

    const col = [
      ['S.No', 10, pw.Alignment.centerLeft],
      ['Description', 30, pw.Alignment.centerLeft],
      ['MRP', 10, pw.Alignment.centerRight],
      ['Rate', 10, pw.Alignment.centerRight],
      ['Qty', 8, pw.Alignment.center],
      ['Amount', 13, pw.Alignment.centerRight],
    ];

    const data = [
      ['1', 'ANNAPORNA PEPPER CHICKEN 40G', '35', '23', '34', '782'],
      ['2', 'HAND GLOVES PLASTIC', '30', '20', '3', '60'],
      ['3', '0.7 Cello Arc', '15', '14', '2', '28'],
      ['4', '1.5L Maaza', '70', '70', '3', '210'],
      ['5', '10 Ml Vapo Rub', '32', '30', '4', '120'],
      ['6', '1000Ml Auto Car Wash Shampoo', '199', '190', '3', '570'],
      ['7', '1000Ml Maid Dishwash', '179', '170', '3', '510'],
      ['8', '100G  Lime', '20', '18', '6', '108'],
      ['9', '100G AVT Leaf Tea', '45', '43', '3', '129'],
    ];

    pdf.addPage(
      pw.Page(
        pageTheme: pw.PageTheme(
          pageFormat: const PdfPageFormat(
            4 * PdfPageFormat.inch,
            double.infinity,
            marginBottom: 1 * PdfPageFormat.inch,
            marginLeft: 5 * PdfPageFormat.mm,
            marginRight: 5 * PdfPageFormat.mm,
            marginTop: 2 * PdfPageFormat.mm,
          ),
          theme: pw.ThemeData.withFont(
            base: await PdfGoogleFonts.robotoLight(),
            bold: await PdfGoogleFonts.robotoBold(),
          ).copyWith(
            defaultTextStyle: const pw.TextStyle(
              fontSize: 12,
              lineSpacing: 1.2,
            ),
            header0: pw.TextStyle(
              fontSize: 16,
              lineSpacing: 1.2,
              fontWeight: pw.FontWeight.bold,
            ),
          ),
        ),
        build: (context) {
          return pw.Column(
            children: [
              pw.Text(
                'SUPER DEPARTMENTAL STORE',
                textAlign: pw.TextAlign.center,
                style: pw.Theme.of(context).header0,
              ),
              pw.SizedBox(height: 6),
              pw.Text(
                '245 Varet St, Brooklyn\nPhone: 1-555-0964',
                textAlign: pw.TextAlign.center,
              ),
              pw.SizedBox(height: 6),
              pw.Text(
                'COUNTER SALE',
                textAlign: pw.TextAlign.center,
                style: pw.Theme.of(context).header0,
              ),
              pw.SizedBox(height: 6),
              pw.Row(
                mainAxisAlignment: pw.MainAxisAlignment.spaceBetween,
                children: [
                  pw.Text(
                    'Date :  27-Nov-2021',
                  ),
                  pw.Text(
                    'Time :  08:54 PM',
                  ),
                ],
              ),
              pw.SizedBox(height: 6),
              pw.Align(
                alignment: pw.Alignment.centerLeft,
                child: pw.Text(
                  'Invoice No. :  5',
                ),
              ),
              pw.Divider(),
              pw.Row(
                mainAxisSize: pw.MainAxisSize.max,
                children: [
                  for (final c in col)
                    pw.Flexible(
                      flex: c[1] as int,
                      child: pw.Align(
                        alignment: c[2] as pw.Alignment,
                        child: pw.Text(
                          c[0] as String,
                        ),
                      ),
                    ),
                ],
              ),
              pw.Divider(),
              for (final d in data) ...[
                pw.Row(
                  mainAxisSize: pw.MainAxisSize.max,
                  children: [
                    for (var i = 0; i < 2; i++)
                      pw.Flexible(
                        flex: i == 1
                            ? col
                                .sublist(1)
                                .map((e) => e[1] as int)
                                .reduce((v, r) => v + r)
                            : col[i][1] as int,
                        child: pw.Align(
                          alignment: col[i][2] as pw.Alignment,
                          child: pw.Text(
                            d[i],
                          ),
                        ),
                      ),
                  ],
                ),
                pw.SizedBox(height: 4),
                pw.Row(
                  mainAxisSize: pw.MainAxisSize.max,
                  children: [
                    for (var i = 1; i < col.length; i++)
                      pw.Flexible(
                        flex: i == 1
                            ? col
                                .sublist(0, 2)
                                .map((e) => e[1] as int)
                                .reduce((v, r) => v + r)
                            : col[i][1] as int,
                        child: pw.Align(
                          alignment: col[i][2] as pw.Alignment,
                          child: pw.Text(
                            i == 1 ? '' : d[i],
                          ),
                        ),
                      ),
                  ],
                ),
                pw.SizedBox(height: 4),
              ],
              pw.Divider(),
              pw.Align(
                alignment: pw.Alignment.centerRight,
                child: pw.Text(
                  'NET AMOUNT :  2517',
                  style: pw.TextStyle(fontWeight: pw.FontWeight.bold),
                ),
              ),
            ],
          );
        },
      ),
    );

    return pdf.save();
  }
}