Annotation Collection in Flutter PDF Viewer widget (Syncfusion)

15 Dec 20231 minute to read

The annotations in the PDF document can be accessed by the getAnnotations method of the PdfViewerController. The return value of the function will have Annotation collection as soon as the document is loaded in the PDF viewer. The following code example shows how the annotation collection can be accessed.

DART

final PdfViewerController _pdfViewerController = PdfViewerController();

@override
Widget build(BuildContext context) {
  return SfPdfViewer.asset(
    'assets/annotations.pdf',
    controller: _pdfViewerController,
    onDocumentLoaded: (PdfDocumentLoadedDetails details) {
      final List<Annotation> annotations =
          _pdfViewerController.getAnnotations();
      if (annotations.isNotEmpty) {
        // Gets the first annotation from the collection.
        final Annotation annotation = annotations.first;
        if (annotation is HighlightAnnotation) {
          final Color color = annotation.color;
          final double opacity = annotation.opacity;
        }
      }
    },
  );
}