annotateSelection method

Implementation

Future<bool> annotateSelection(UDocSelection selection, UDocTextPage text) async {
  if (selection.isEmpty) return false;
  attach();
  final UPdfEdit? edit = _edit;
  if (edit == null) return false;
  final UDocPageInfo info = viewer.pageInfo(selection.pageIndex);
  final List<Rect> quads = selection.rects.map((Rect rect) => deviceRectToPdf(info, rect)).toList();
  if (quads.isEmpty) return false;
  Rect bounds = quads.first;
  for (final Rect quad in quads) {
    bounds = bounds.expandToInclude(quad);
  }
  final UPdfAnnotationStyle style;
  switch (_tool) {
    case UPdfTool.underline:
      style = UPdfAnnotationStyle.underline;
      break;
    case UPdfTool.strikeOut:
      style = UPdfAnnotationStyle.strikeOut;
      break;
    case UPdfTool.redact:
      style = UPdfAnnotationStyle.redact;
      break;
    default:
      style = UPdfAnnotationStyle.highlight;
      break;
  }
  final int number = await edit.addAnnotation(
    selection.pageIndex,
    UPdfAnnotationSpec(style: style, rect: bounds.inflate(1), quads: quads, color: _color, opacity: _opacity, contents: selection.text, author: _author, rtl: UDocText.isRtl(selection.text)),
  );
  if (number > 0) _undoStack.add(number);
  viewer.invalidatePage(selection.pageIndex);
  notifyListeners();
  return number > 0;
}