PdfViewerControl.AnnotationChanging Event
In This Article
Fires before an annotation is changed.
Namespace: DevExpress.Xpf.PdfViewer
Assembly: DevExpress.Xpf.PdfViewer.v24.2.dll
NuGet Package: DevExpress.Wpf.PdfViewer
#Declaration
public event PdfAnnotationChangingEventHandler AnnotationChanging
#Event Data
The AnnotationChanging event's data class is PdfAnnotationChangingEventArgs. The following properties provide information specific to this event:
Property | Description |
---|---|
Cancel | Gets or sets whether the event should be canceled. |
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 Routed |
New |
Returns an annotation’s new property values. |
Old |
Returns an annotation’s previous property values. |
Original |
Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class.
Inherited from Routed |
Routed |
Gets or sets the Routed |
Source |
Gets or sets a reference to the object that raised the event.
Inherited from Routed |
The event data class exposes the following methods:
Method | Description |
---|---|
Invoke |
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 Routed |
On |
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 Routed |
#Remarks
The code sample below prohibits changing annotations of a specific author:
<dxpdf:PdfViewerControl x:Name="pdfViewer"
AnnotationChanging="pdfViewer_AnnotationChanging">
private void pdfViewer_AnnotationChanging(object sender, PdfAnnotationChangingEventArgs e)
{
if (e.OldAnnotation.Author == "Cardle Anita L") { e.Cancel = true; }
}
See Also