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How to enable a custom Save button when a PDF document has changes and should be saved

created 4 years ago

Hi,
I am using the PDFViewer to load and save a memory stream document which is a PDF fillable.

I created a "Save" button to handle my custom code, but I want to be able to enable/disable this custom "Save" button when the PDF document has changed in the PDFViewer.

I tried handling the PDFViewer.DocumentChanged() event but this event will only trigger when the document is being loaded.

What event should I use to check for the PDFViewer.IsDocumentChanged value to enable/disable my custom "Save" button when user enter any information in any of the PDF fields.

I am using VB.NET

Thanks!

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Answers approved by DevExpress Support

created 4 years ago

Hello Edhy,
PdfViewer doesn't have an event that is raised when an end-user modifies a PDF document. You can create a timer and check the IsDocumentChanged property value on a timer tick. It's also possible to check this property on the Application.Idle event.
Should you have additional questions, feel free to contact me.

    Show previous comments (1)
    Maria Nikulina (DevExpress) 4 years ago

      You are welcome.

      DS DS
      Dominik S. 4 years ago

        Hi Mariya,

        we have the same requirement like Edhy.

        Are there plans to introduce such event or adding a "normal" save button on your side?
        For RichEditControl you have the following nice event

        Regards
        Dominik

        DevExpress Support Team 4 years ago

          Hi Dominik,

          While there is no built-in event to determine the moment when a document is changed, you can add a custom Save button to your project. Create a temporary variable, handle the PdfViewer.FormFieldValueChanged, PdfViewer.AnnotationChanged, PdfViewer.AnnotationCreated, and PdfViewer.AnnotationDeleted events, and change this variable value if a form field or annotation is modified.

          You can reset this variable value in the PdfViewer.DocumentChanged event handler.

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