captureCompositeImage static method

Future<File?> captureCompositeImage(ScreenshotController controller, String fileName)

Implementation

static Future<File?> captureCompositeImage(
  ScreenshotController controller,
  String fileName,
) async {
  try {
    // Wait for UI to settle
    await Future.delayed(const Duration(milliseconds: 1000));

    // Capture the screenshot
    final Uint8List? imageBytes = await controller.capture();

    if (imageBytes == null) {
      throw Exception('Screenshot capture returned null');
    }

    if (imageBytes.isEmpty) {
      throw Exception('Screenshot capture returned empty data');
    }

    if (imageBytes.length < 1024) {
      throw Exception('Screenshot data too small: ${imageBytes.length} bytes');
    }

    // Get temporary directory
    final Directory tempDir = await getTemporaryDirectory();
    final String filePath = '${tempDir.path}/$fileName';
    final File compositeImageFile = File(filePath);

    // Write the image bytes
    await compositeImageFile.writeAsBytes(imageBytes);

    // Verify the file was created
    if (await compositeImageFile.exists()) {
      final fileSize = await compositeImageFile.length();
      if (fileSize > 0) {
        print('Image saved successfully: ${compositeImageFile.path} (${fileSize} bytes)');
        return compositeImageFile;
      } else {
        throw Exception('Created file is empty');
      }
    } else {
      throw Exception('Failed to create output file');
    }
  } catch (e) {
    print('Error capturing composite image: $e');
    throw Exception('Failed to capture and save image: $e');
  }
}