khmer_pdf_fixer 0.1.0

Flutter helpers for rendering Khmer text in generated PDFs with bundled Siemreap font support.

example/lib/main.dart

import 'dart:io';
import 'package:flutter/material.dart';
import 'package:khmer_pdf_fixer/khmer_pdf_fixer.dart';
import 'package:path_provider/path_provider.dart';
import 'package:open_file/open_file.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Khmer PDF Fixer Demo',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: const DemoPage(),
    );
  }
}

class DemoPage extends StatefulWidget {
  const DemoPage({super.key});

  @override
  State<DemoPage> createState() => _DemoPageState();
}

class _DemoPageState extends State<DemoPage> {
  bool _isGenerating = false;

  Future<List<pw.Widget>> _buildRasterContent() async {
    const pageContentWidth = 515.0;
    const tableWidth = 480.0;
    const col1 = 80.0;
    const col2 = 170.0;
    const col3 = 80.0;
    const col4 = 100.0;

    final header = await KhmerTextRaster.create(
      'វិក្កយបត្រ (Invoice)',
      fontSize: 28,
      fontWeight: pw.FontWeight.bold,
      color: PdfColors.blue800,
    );

    final paragraph = await KhmerTextRaster.create(
      'សូមស្វាគមន៍មកកាន់ប្រព័ន្ធរបស់យើង។ នេះគឺជាឧទាហរណ៍នៃការប្រើប្រាស់ Khmer PDF Fixer ដើម្បីបង្ហាញអក្សរខ្មែរឲ្យបានត្រឹមត្រូវ។',
      fontSize: 14,
      maxWidth: pageContentWidth,
      textAlign: pw.TextAlign.justify,
    );

    final richTextLine = pw.Wrap(
      spacing: 0,
      runSpacing: 0,
      children: [
        await KhmerTextRaster.create('នេះគឺជា ', fontSize: 14),
        await KhmerTextRaster.create(
          'អត្ថបទដិត',
          fontSize: 14,
          fontWeight: pw.FontWeight.bold,
          color: PdfColors.red,
        ),
        await KhmerTextRaster.create(' និងអត្ថបទធម្មតា។', fontSize: 14),
      ],
    );

    final featureHeader = await KhmerTextRaster.create(
      'លក្ខណៈពិសេស៖',
      fontSize: 18,
      fontWeight: pw.FontWeight.bold,
    );

    final bullets = <pw.Widget>[
      await KhmerTextRaster.bulletItem(
        'បង្ហាញពុម្ពអក្សរខ្មែរបានត្រឹមត្រូវ',
        maxWidth: pageContentWidth - 20,
      ),
      await KhmerTextRaster.bulletItem(
        'គាំទ្រតារាង និងបញ្ជី',
        maxWidth: pageContentWidth - 20,
      ),
      await KhmerTextRaster.bulletItem(
        'ងាយស្រួលប្រើប្រាស់ជាមួយ pdf package',
        maxWidth: pageContentWidth - 20,
      ),
    ];

    final tableHeader = await KhmerTextRaster.create(
      'តារាងទិន្នន័យ៖',
      fontSize: 18,
      fontWeight: pw.FontWeight.bold,
    );

    final tableRows = <List<String>>[
      ['លេខរៀង', 'ឈ្មោះមុខទំនិញ', 'បរិមាណ', 'តម្លៃសរុប'],
      ['១', 'កុំព្យូទ័រយួរដៃ', '២', '\$២០០០'],
      ['២', 'ទូរស័ព្ទដៃស៊េរីទំនើប', '៥', '\$៥០០០'],
      ['៣', 'កាសស្តាប់ត្រចៀក', '១០', '\$២០០'],
    ];

    final table = pw.Table(
      border: pw.TableBorder.all(color: PdfColors.grey, width: 1),
      columnWidths: const {
        0: pw.FixedColumnWidth(col1),
        1: pw.FixedColumnWidth(col2),
        2: pw.FixedColumnWidth(col3),
        3: pw.FixedColumnWidth(col4),
      },
      children: [
        for (var rowIndex = 0; rowIndex < tableRows.length; rowIndex++)
          pw.TableRow(
            decoration: rowIndex == 0
                ? const pw.BoxDecoration(color: PdfColors.blue100)
                : null,
            children: [
              pw.Padding(
                padding: const pw.EdgeInsets.all(8),
                child: await KhmerTextRaster.tableCell(
                  tableRows[rowIndex][0],
                  maxWidth: col1 - 16,
                  fontSize: 12,
                  fontWeight:
                      rowIndex == 0 ? pw.FontWeight.bold : pw.FontWeight.normal,
                ),
              ),
              pw.Padding(
                padding: const pw.EdgeInsets.all(8),
                child: await KhmerTextRaster.tableCell(
                  tableRows[rowIndex][1],
                  maxWidth: col2 - 16,
                  fontSize: 12,
                  fontWeight:
                      rowIndex == 0 ? pw.FontWeight.bold : pw.FontWeight.normal,
                ),
              ),
              pw.Padding(
                padding: const pw.EdgeInsets.all(8),
                child: await KhmerTextRaster.tableCell(
                  tableRows[rowIndex][2],
                  maxWidth: col3 - 16,
                  fontSize: 12,
                  fontWeight:
                      rowIndex == 0 ? pw.FontWeight.bold : pw.FontWeight.normal,
                ),
              ),
              pw.Padding(
                padding: const pw.EdgeInsets.all(8),
                child: await KhmerTextRaster.tableCell(
                  tableRows[rowIndex][3],
                  maxWidth: col4 - 16,
                  fontSize: 12,
                  fontWeight:
                      rowIndex == 0 ? pw.FontWeight.bold : pw.FontWeight.normal,
                ),
              ),
            ],
          ),
      ],
    );

    final thankYou = await KhmerTextRaster.create(
      'សូមអរគុណ!',
      fontSize: 20,
      fontWeight: pw.FontWeight.bold,
      color: PdfColors.green700,
    );

    return [
      pw.Center(child: header),
      pw.SizedBox(height: 20),
      paragraph,
      pw.SizedBox(height: 20),
      richTextLine,
      pw.SizedBox(height: 20),
      featureHeader,
      pw.SizedBox(height: 10),
      ...bullets
          .expand((item) => [item, pw.SizedBox(height: 8)])
          .toList()
        ..removeLast(),
      pw.SizedBox(height: 30),
      tableHeader,
      pw.SizedBox(height: 10),
      pw.Center(child: pw.SizedBox(width: tableWidth, child: table)),
      pw.SizedBox(height: 30),
      pw.Center(child: thankYou),
    ];
  }

  Future<void> _generatePdf() async {
    setState(() => _isGenerating = true);
    try {
      // 1. Initialize the font manager
      await KhmerFontManager().initialize();

      // 2. Create a PDF document
      final pdf = pw.Document();
      final content = await _buildRasterContent();

      // 3. Add a page
      pdf.addPage(
        pw.MultiPage(
          pageFormat: PdfPageFormat.a4,
          build: (context) => content,
        ),
      );

      // Save and open
      final dir = await getApplicationDocumentsDirectory();
      final file = File('${dir.path}/khmer_demo.pdf');
      await file.writeAsBytes(await pdf.save());

      await OpenFile.open(file.path);
    } catch (e) {
      if (mounted) {
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text('Error generating PDF: $e')));
      }
    } finally {
      if (mounted) setState(() => _isGenerating = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Khmer PDF Fixer Example')),
      body: Center(
        child: _isGenerating
            ? const CircularProgressIndicator()
            : ElevatedButton.icon(
                onPressed: _generatePdf,
                icon: const Icon(Icons.picture_as_pdf),
                label: const Text('Generate Khmer PDF'),
                style: ElevatedButton.styleFrom(
                  padding: const EdgeInsets.symmetric(
                    horizontal: 24,
                    vertical: 16,
                  ),
                  textStyle: const TextStyle(fontSize: 18),
                ),
              ),
      ),
    );
  }
}