megapdf_flutter 0.0.2

Flutter plugin for MegaPDF API to manipulate PDF files with conversion, compression, merging, splitting, protection, and other functionalities.

example/lib/main.dart

import 'dart:io';

import 'package:file_picker/file_picker.dart';
import 'package:flutter/material.dart';
import 'package:megapdf_flutter/megapdf_flutter.dart';
import 'package:megapdf_flutter/src/models/models.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:url_launcher/url_launcher.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

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

class MegaPdfDemoHome extends StatefulWidget {
  const MegaPdfDemoHome({Key? key}) : super(key: key);

  @override
  State<MegaPdfDemoHome> createState() => _MegaPdfDemoHomeState();
}

class _MegaPdfDemoHomeState extends State<MegaPdfDemoHome> {
  final MegaPdf _megaPdf = MegaPdf();
  bool _isInitialized = false;
  bool _isLoading = false;
  String _result = '';
  String? _outputFilePath;
  final TextEditingController _apiKeyController = TextEditingController(
  );

  @override
  void initState() {
    super.initState();
    _checkInitialization();
    _requestPermissions();
  }

  Future<void> _requestPermissions() async {
    if (Platform.isAndroid || Platform.isIOS) {
      await [Permission.storage].request();
    }
  }

  Future<void> _checkInitialization() async {
    setState(() {
      _isLoading = true;
    });

    try {
      final initialized = await _megaPdf.initializeFromPreferences();
      setState(() {
        _isInitialized = initialized;
      });
    } catch (e) {
      debugPrint('Error checking initialization: $e');
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<void> _initializeSdk() async {
    if (_apiKeyController.text.isEmpty) {
      _showError('Please enter an API key');
      return;
    }

    setState(() {
      _isLoading = true;
    });

    try {
      await _megaPdf.initialize(apiKey: _apiKeyController.text);
      setState(() {
        _isInitialized = true;
        _result = 'SDK initialized successfully';
      });
    } catch (e) {
      _showError('Failed to initialize SDK: $e');
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<File?> _pickPdfFile() async {
    FilePickerResult? result = await FilePicker.platform.pickFiles(
      type: FileType.custom,
      allowedExtensions: ['pdf'],
    );

    if (result != null && result.files.single.path != null) {
      return File(result.files.single.path!);
    }
    return null;
  }

  Future<List<File>?> _pickMultiplePdfFiles() async {
    FilePickerResult? result = await FilePicker.platform.pickFiles(
      type: FileType.custom,
      allowedExtensions: ['pdf'],
      allowMultiple: true,
    );

    if (result != null) {
      return result.paths
          .whereType<String>()
          .map((path) => File(path))
          .toList();
    }
    return null;
  }

  Future<void> _compressPdf() async {
    if (!_isInitialized) {
      _showError('Please initialize the SDK first');
      return;
    }

    setState(() {
      _isLoading = true;
      _result = 'Compressing PDF...';
      _outputFilePath = null;
    });

    try {
      final file = await _pickPdfFile();
      if (file == null) {
        setState(() {
          _result = 'No file selected';
          _isLoading = false;
        });
        return;
      }

      final response = await _megaPdf.compressPdf(
        file: file,
        options: CompressOptions(quality: 'medium'),
      );

      if (response.success && response.fileUrl != null) {
        final outputFile = await _downloadFile(
          response.fileUrl!,
          'compressed.pdf',
        );
        setState(() {
          _result =
              'PDF compressed successfully.\nOriginal size: ${response.get<int>('originalSize')}\nCompressed size: ${response.get<int>('compressedSize')}\nCompression ratio: ${response.get<String>('compressionRatio')}';
          _outputFilePath = outputFile.path;
        });
      } else {
        setState(() {
          _result = 'Compression failed: ${response.error}';
        });
      }
    } catch (e) {
      setState(() {
        _result = 'Error during compression: $e';
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<void> _mergePdfs() async {
    if (!_isInitialized) {
      _showError('Please initialize the SDK first');
      return;
    }

    setState(() {
      _isLoading = true;
      _result = 'Merging PDFs...';
      _outputFilePath = null;
    });

    try {
      final files = await _pickMultiplePdfFiles();
      if (files == null || files.isEmpty || files.length < 2) {
        setState(() {
          _result = 'Please select at least 2 PDF files';
          _isLoading = false;
        });
        return;
      }

      final response = await _megaPdf.mergePdfs(files: files);

      if (response.success && response.fileUrl != null) {
        final outputFile = await _downloadFile(response.fileUrl!, 'merged.pdf');
        setState(() {
          _result = 'PDFs merged successfully.\nMerged ${files.length} files.';
          _outputFilePath = outputFile.path;
        });
      } else {
        setState(() {
          _result = 'Merge failed: ${response.error}';
        });
      }
    } catch (e) {
      setState(() {
        _result = 'Error during merging: $e';
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<void> _convertPdf() async {
    if (!_isInitialized) {
      _showError('Please initialize the SDK first');
      return;
    }

    setState(() {
      _isLoading = true;
      _result = 'Converting PDF...';
      _outputFilePath = null;
    });

    try {
      final file = await _pickPdfFile();
      if (file == null) {
        setState(() {
          _result = 'No file selected';
          _isLoading = false;
        });
        return;
      }

      // Show a dialog to select output format
      final outputFormat = await _showFormatSelectionDialog();
      if (outputFormat == null) {
        setState(() {
          _result = 'No output format selected';
          _isLoading = false;
        });
        return;
      }

      final response = await _megaPdf.convertPdf(
        file: file,
        outputFormat: outputFormat,
        options: ConversionOptions(ocr: false, quality: 90),
      );

      if (response.success && response.fileUrl != null) {
        final outputFile = await _downloadFile(
          response.fileUrl!,
          'converted.$outputFormat',
        );
        setState(() {
          _result = 'PDF converted successfully to $outputFormat';
          _outputFilePath = outputFile.path;
        });
      } else {
        setState(() {
          _result = 'Conversion failed: ${response.error}';
        });
      }
    } catch (e) {
      setState(() {
        _result = 'Error during conversion: $e';
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<String?> _showFormatSelectionDialog() async {
    return showDialog<String>(
      context: context,
      builder:
          (context) => SimpleDialog(
            title: const Text('Select output format'),
            children:
                ['docx', 'xlsx', 'pptx', 'html', 'txt', 'jpg', 'png']
                    .map(
                      (format) => SimpleDialogOption(
                        onPressed: () => Navigator.pop(context, format),
                        child: Text(format.toUpperCase()),
                      ),
                    )
                    .toList(),
          ),
    );
  }

  Future<File> _downloadFile(String url, String fileName) async {
    final directory = await getApplicationDocumentsDirectory();
    final filePath = '${directory.path}/$fileName';
    final file = File(filePath);

    // If the URL is relative, make it absolute
    if (url.startsWith('/')) {
      url = '${_megaPdf.baseUrl}$url';
    }

    // Download the file
    try {
      await _megaPdf.downloadFile(url, filePath);
      return file;
    } catch (e) {
      throw Exception('Failed to download file: $e');
    }
  }

  Future<void> _protectPdf() async {
    if (!_isInitialized) {
      _showError('Please initialize the SDK first');
      return;
    }

    setState(() {
      _isLoading = true;
      _result = 'Protecting PDF...';
      _outputFilePath = null;
    });

    try {
      final file = await _pickPdfFile();
      if (file == null) {
        setState(() {
          _result = 'No file selected';
          _isLoading = false;
        });
        return;
      }

      // Show a dialog to enter password
      final password = await _showPasswordDialog();
      if (password == null || password.isEmpty) {
        setState(() {
          _result = 'Password is required';
          _isLoading = false;
        });
        return;
      }

      final response = await _megaPdf.protectPdf(
        file: file,
        password: password,
        options: ProtectionOptions(
          allowPrinting: true,
          allowCopying: false,
          allowEditing: false,
        ),
      );

      if (response.success && response.fileUrl != null) {
        final outputFile = await _downloadFile(
          response.fileUrl!,
          'protected.pdf',
        );
        setState(() {
          _result = 'PDF protected successfully with password';
          _outputFilePath = outputFile.path;
        });
      } else {
        setState(() {
          _result = 'Protection failed: ${response.error}';
        });
      }
    } catch (e) {
      setState(() {
        _result = 'Error during protection: $e';
      });
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  Future<String?> _showPasswordDialog() async {
    final passwordController = TextEditingController();
    return showDialog<String>(
      context: context,
      builder:
          (context) => AlertDialog(
            title: const Text('Enter password'),
            content: TextField(
              controller: passwordController,
              decoration: const InputDecoration(hintText: 'Password'),
              obscureText: true,
            ),
            actions: [
              TextButton(
                onPressed: () => Navigator.pop(context),
                child: const Text('CANCEL'),
              ),
              TextButton(
                onPressed:
                    () => Navigator.pop(context, passwordController.text),
                child: const Text('OK'),
              ),
            ],
          ),
    );
  }

  void _showError(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message), backgroundColor: Colors.red),
    );
  }

  Future<void> _openOutputFile() async {
    if (_outputFilePath != null) {
      final uri = Uri.file(_outputFilePath!);
      if (await canLaunchUrl(uri)) {
        await launchUrl(uri);
      } else {
        _showError('Cannot open file');
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('MegaPDF Demo')),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            if (!_isInitialized) ...[
              TextField(
                controller: _apiKeyController,
                decoration: const InputDecoration(
                  labelText: 'API Key',
                  hintText: 'Enter your MegaPDF API key',
                  border: OutlineInputBorder(),
                ),
              ),
              const SizedBox(height: 16),
              ElevatedButton(
                onPressed: _isLoading ? null : _initializeSdk,
                child: const Text('Initialize SDK'),
              ),
            ] else ...[
              Text(
                'API Key: ${_megaPdf.apiKey!.substring(0, 8)}...',
                style: const TextStyle(fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 16),
              Wrap(
                spacing: 8,
                runSpacing: 8,
                children: [
                  ElevatedButton(
                    onPressed: _isLoading ? null : _compressPdf,
                    child: const Text('Compress PDF'),
                  ),
                  ElevatedButton(
                    onPressed: _isLoading ? null : _mergePdfs,
                    child: const Text('Merge PDFs'),
                  ),
                  ElevatedButton(
                    onPressed: _isLoading ? null : _convertPdf,
                    child: const Text('Convert PDF'),
                  ),
                  ElevatedButton(
                    onPressed: _isLoading ? null : _protectPdf,
                    child: const Text('Protect PDF'),
                  ),
                ],
              ),
            ],
            const SizedBox(height: 16),
            Expanded(
              child: Container(
                padding: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.grey),
                  borderRadius: BorderRadius.circular(8),
                ),
                child: SingleChildScrollView(
                  child:
                      _isLoading
                          ? const Center(child: CircularProgressIndicator())
                          : SelectableText(_result),
                ),
              ),
            ),
            if (_outputFilePath != null) ...[
              const SizedBox(height: 16),
              OutlinedButton.icon(
                onPressed: _openOutputFile,
                icon: const Icon(Icons.open_in_new),
                label: const Text('Open Output File'),
              ),
            ],
          ],
        ),
      ),
    );
  }
}

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