wpf-devexpress-dot-xpf-dot-pdfviewer-dot-pdfviewercontrol-a621154e.md
Fires after an annotation has been changed.
Namespace : DevExpress.Xpf.PdfViewer
Assembly : DevExpress.Xpf.PdfViewer.v25.2.dll
NuGet Package : DevExpress.Wpf.PdfViewer
public event PdfAnnotationChangedEventHandler AnnotationChanged
Public Event AnnotationChanged As PdfAnnotationChangedEventHandler
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. |
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:
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");
}
}
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
See Also