prepareExternalSignatureTopLeft static method

Future<PdfExternalSigningPrepared> prepareExternalSignatureTopLeft({ required Uint8List inputBytes, required int pageNumber, required double left, required double top, required double width, required double height, required String fieldName, PdfSignatureConfig? signature, List<List<int>> publicCertificates = const <List<int>>[], void drawAppearance(PdfGraphics graphics, PdfRect bounds)?, })

Prepares a PDF for external signing using top-left coordinates.

Implementation

static Future<PdfExternalSigningPrepared> prepareExternalSignatureTopLeft({
  required Uint8List inputBytes,
  required int pageNumber,
  required double left,
  required double top,
  required double width,
  required double height,
  required String fieldName,
  PdfSignatureConfig? signature,
  List<List<int>> publicCertificates = const <List<int>>[],
  void Function(PdfGraphics graphics, PdfRect bounds)? drawAppearance,
}) async {
  final parser = PdfDocumentParser(inputBytes);
  final document = PdfDocument.load(parser);
  final pageIndex = pageNumber - 1;
  if (pageIndex < 0 || pageIndex >= document.pdfPageList.pages.length) {
    throw RangeError.index(
        pageIndex, document.pdfPageList.pages, 'pageNumber');
  }
  final page = document.pdfPageList.pages[pageIndex];
  final pageHeight = page.pageFormat.height;
  final bounds = PdfRect(left, pageHeight - top - height, width, height);

  return PdfExternalSigning.preparePdf(
    inputBytes: inputBytes,
    pageNumber: pageNumber,
    bounds: bounds,
    fieldName: fieldName,
    signature: signature,
    publicCertificates: publicCertificates,
    drawAppearance: drawAppearance,
  );
}