Currently, RadPdfViewer offers the DataError event which is purposed to handle errors during the import process. However, if there are problematic pages that are rendered in the viewer at a later moment after the document is already imported, the viewer doesn't offer a suitable way for handling such problematic moments even though the PdfProcessing library throws one of its exceptions. 

The exact client's case is loading a PDF document which contains images requiring JPX Decoder which is currently not supported. Even though the PdfProcessing library throws internally the following error, the RadPdfViewer control doesn't throw the DataError event with the respective error:

Telerik.Windows.Documents.Fixed.Exceptions.NotSupportedFilterException: 'JPXDecode is not supported.'

 

Enable the customers to work with annotations of type Stamp.

A pop-up annotation displays text in a pop-up window for entry and editing. It typically does not appear alone but is associated with a markup annotation (its parent annotation) and is used for editing the parent’s text.

Provide a new property that specifies FileName in SaveAs command.

Add functionality for a PDF form filler that supports text auto-sizing/shrinking like Adobe:

Introduce locking a document opened in viewer.

Expose API that allows you to access the current editor. Perhaps add some events to the EditingFields class.

Add support for XFA fields

An implementation of JPXDecoder should be created to allow the decompression of data encoded using the wavelet-based JPEG2000 standard.

Introduce support for per page rotation. The result should be automatically saved as well. 

The PDF model allows actions to be defined for widgets using the optional /A entry. 

According to the PDF specification: Codes are never longer than 12 bits; therefore, entry 4095 is the last entry of the LZW table.

Add support for Trigger Events

Show the DropDownList icon when the document contains ComboBox field. This is the default behavior in adobe as well. 

I would like to be able to set a list of page numbers that will be skipped/not loaded by the PDFViewer.

RadPdfViewer partially supports CCITTFaxDecode (that is basically TIFF). There are some limitations that are not supported at this stage like EncodedByteAlign = true or Group 3, 2-D encoding.

When a pdf/a compliant document is opened in Adobe, there is a bar saying that the document is compliant with the standard. Expose such functionality in PdfViewer as well.

The current implementation relies on valid cross-reference table offsets in the PDF documents so that PDF objects are easily found and parsed. However, a mechanism for importing documents with invalid cross-reference table offsets may be implemented.

The attached project shows how to repair such documents.

A remote go-to action is similar to an ordinary go-to action but jumps to a destination in another PDF file instead of the current file.