📄 Flutter PDF Report Generator

🚀 Overview

This Flutter service generates high-quality PDF reports from UI screenshots while handling long scrollable content efficiently. It supports:

• Capturing UI as an image.
• Splitting long images into multiple PDF pages.
• Enhancing image resolution to maintain clarity.
• Processing images in a separate isolate to prevent UI freezing.

✨ Features

• 📷 Screenshot Capture: Uses ScreenshotController to capture the UI.
• 🖼 Image Processing in Isolate: Offloads image processing to a separate thread to keep the app responsive.
• 📑 Multi-Page PDF Generation: Splits long screenshots into multiple A4-sized pages.
• 📂 Local File Storage: Saves both the PDF and image to external storage.
• 📤 File Sharing: Allows opening and sharing the generated files.

🛠 Technologies Used

• Flutter
• screenshot (Capture UI as image)
• pdf (Generate PDFs)
• image (Image processing)
• path_provider (Access storage paths)
• open_file_plus (Open files)
• isolate (Background image processing)

📦 Installation

1. Add dependencies to pubspec.yaml:

   dependencies:
     flutter:
       sdk: flutter
     screenshot: ^1.3.0
     pdf: ^3.10.4
     path_provider: ^2.0.15
     open_file_plus: ^3.4.1
     image: ^4.0.17

2. Run:

   flutter pub get

🔥 Usage

1️⃣ Initialize the PdfGeneratorService

final screenshotController = ScreenshotController();
final pdfService = PdfGeneratorService(screenshotController: screenshotController);

2️⃣ Capture Screenshot & Generate PDF

await pdfService.generateAndSave(context);

📸 How It Works

1. Capture Screenshot: The UI is captured using ScreenshotController.
2. Process Image in Isolate: The captured image is resized in a separate thread to prevent UI freezing.
3. Split Image if Too Long: If the image height exceeds A4 size, it's split into multiple pages.
4. Generate & Save PDF: The processed image parts are saved as a multi-page PDF.
5. Preview, Open, or Share: The user can view, open, or share the generated files.

🏗 Example UI Implementation

Screenshot(
  controller: screenshotController,
  child: MyCustomReportWidget(),
);

📝 License

This project is licensed under the MIT License.

📬 Contact

For any questions, feel free to open an issue or reach out. Happy coding! 🚀