PdfViewerControl.AnnotationChanged Event

Fires after an annotation has been changed.

Namespace: DevExpress.Xpf.PdfViewer

Assembly: DevExpress.Xpf.PdfViewer.v20.2.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.PdfViewer, DevExpress.Wpf.PdfViewer

Declaration

C#

public event PdfAnnotationChangedEventHandler AnnotationChanged

VB.NET

Public Event AnnotationChanged As PdfAnnotationChangedEventHandler

Event Data

The AnnotationChanged event's data class is PdfAnnotationChangedEventArgs. The following properties provide information specific to this event:

Property	Description
Annotation	Obtains the changed annotation.
Handled	Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
OriginalSource	Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
RoutedEvent	Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

The event data class exposes the following methods:

Method	Description
InvokeEventHandler(Delegate, Object)	When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs.
OnSetSource(Object)	When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs.

Remarks

The PdfAnnotationChangedEventArgs.Annotation property gets the changed annotation. Use the DevExpress.Pdf.PdfViewerAnnotationExtensions class methods to obtain the specific type of annotation.

The code sample below shows how to check whether the markup annotation of a specific author was changed:

C#

private void PdfViewer_MarkupAnnotationChanged(object sender,
PdfAnnotationChangedEventArgs e)
{
    if (e.Annotation.Type == PdfAnnotationType.TextMarkup
    || e.Annotation.Type == PdfAnnotationType.Text)
    {
        IPdfViewerMarkupAnnotation annotation =
         e.Annotation.AsMarkupAnnotation();
        if (annotation.Author == "Brian Zetc")
            MessageBox.Show("The main editor's annotation is changed");
    }
}

VB.NET

 Private Sub PdfViewer_MarkupAnnotationChanged(ByVal sender As Object,
  ByVal e As PdfAnnotationChangedEventArgs)
    If e.Annotation.Type = PdfAnnotationType.TextMarkup
       OrElse e.Annotation.Type = PdfAnnotationType.Text Then
      Dim annotation As IPdfViewerMarkupAnnotation =
       e.Annotation.AsMarkupAnnotation()
      If annotation.Author = "Brian Zetc" Then
        MessageBox.Show("The main editor's annotation is changed")
      End If
    End If
End Sub