Drag & Drop Custom Stamp

[Arthur Butler]

Hi.  I want to be able to drag a custom stamp (image) from my toolbar and drop it on an arbitrary location on the Pdf?Viewer.  During the drop event, how can I find the page number and location on that page in the PdfViewer?

Regards,

Arthur

[Ashokkumar Viswanathan]

Hi Arthur, 

Greetings from Syncfusion support, 

Your requirement of getting the exact page number and position of the custom stamp added can be achieved using the StampAnnotationAdded event handler. The StampAnnotationAddedEventArgs properties of the added custom stamp annotation includes page number and bounds information.  

Please refer the below code snippet, 

pdfViewerControl.StampAnnotationAdded += PdfViewerControl_StampAnnotationAdded;  

 

private void PdfViewerControl_StampAnnotationAdded(object sender, StampAnnotationAddedEventArgs e) 

        { 

            //Gets the page number of added stamp annotation 

            int pageNumber = e.PageNumber; 

 

            //Gets the bounds of added stamp annotation 

            Rectangle bounds = e.Bounds; 

        } 

 

Please find the UG documentation in the below link, 

https://help.syncfusion.com/xamarin/pdf-viewer/working-with-custom-stamp-annotations#add-a-custom-stamp 

 

If our understanding is different from your requirement, kindly explain your requirement and the use case scenario elaborately. So that it will helpful for us to analyze the issue and provide a better solution at earliest. 

 

Please let us know whether the provided solution resolved your query. 

Best & Regards,
Ashok Kumar Viswanathan.  

[Arthur Butler]

Thank you for the quick response.  I want to know how to convert the coordinates from a Drop event on the PdfViewer to a page number and coordinate so that I can call the pdfViewer.AddStamp(View view, int pageNumber, Point position) function to put a stamp at the dropped location.

Regards,

Arthur

[Ashokkumar Viswanathan]

Hi Arthur, 

 

Thank you for your update, 

 

We will analyze the possibility of adding stamp annotation using drop event and we will update further details on November 20^th 2020. 

 

Regards 

Ashok Kumar Viswanathan. 

[Ashokkumar Viswanathan]

Hi Arthur, 

 

While analyzing the possibility of adding stamp annotation using drag and drop, we could not find any solution to get the X and Y co-ordinates where the image is dropped. However, as alternate solution we can suggest you with PdfViewer control’s Tapped event, where you could get the proper co-ordinate points and page number to add stamp instead of using drag and drop approach.  

 

Please refer the below code snippet,  

pdfViewerControl.Tapped += PdfViewerControl_Tapped; 

  

private void PdfViewerControl_Tapped(object sender, TouchInteractionEventArgs e) 

        { 

                                           //Gets the page number of tapped page 

                                           int pageNumber = e.PageNumber; 

 

                                           //Gets the tapped co-ordinates 

                                           Point tappedPoint = e.Position; 

 

                                           pdfViewerControl.AddStamp(image, pageNumber, tappedPoint); 

 

       } 

 

Also please refer the below blog to add custom stamp, 

https://www.syncfusion.com/blogs/post/adding-a-custom-stamp-to-a-pdf-using-xamarin-pdf-viewer.aspx  

 

Please let us know whether, the above suggested approach is okay for you.  Meanwhile, we will analyze the possibility of obtaining the drop location by implementing the finger/pointer move, finger/pointer released events instead of using the Drop event as it does not provide the location.  

 

Regards, 

Ashok Kumar Viswanathan.