AnnotationHelper.GetAnchorInfo(AnnotationService, Annotation) Method

Definition

Namespace:

System.Windows.Annotations

Assembly:

PresentationFramework.dll

Returns an IAnchorInfo object that provides anchoring information, such as the anchor location, about the specified annotation.

public:
 static System::Windows::Annotations::IAnchorInfo ^ GetAnchorInfo(System::Windows::Annotations::AnnotationService ^ service, System::Windows::Annotations::Annotation ^ annotation);

public static System.Windows.Annotations.IAnchorInfo GetAnchorInfo (System.Windows.Annotations.AnnotationService service, System.Windows.Annotations.Annotation annotation);

static member GetAnchorInfo : System.Windows.Annotations.AnnotationService * System.Windows.Annotations.Annotation -> System.Windows.Annotations.IAnchorInfo

Public Shared Function GetAnchorInfo (service As AnnotationService, annotation As Annotation) As IAnchorInfo

Parameters

service

AnnotationService

The annotation service to use for this operation.

annotation

Annotation

The annotation to get anchoring information for.

Returns

IAnchorInfo

An IAnchorInfo object that provides anchoring information about the specified annotation, or null if it cannot be resolved.

Examples

Consider a simple document reader application that has a comments pane. The comments pane might be a list box that displays the text from a list of annotations that are anchored to a document. If the user selects an item in the list box, then the application brings into view the paragraph in the document that the corresponding annotation object is anchored to.

The following example demonstrates how to implement the event handler of such a list box that serves as the comments pane.

void annotationsListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{

    Annotation comment = (sender as ListBox).SelectedItem as Annotation;
    if (comment != null)
    {
        // IAnchorInfo info;
        // service is an AnnotationService object
        // comment is an Annotation object
        info = AnnotationHelper.GetAnchorInfo(this.service, comment);
        TextAnchor resolvedAnchor = info.ResolvedAnchor as TextAnchor;
        TextPointer textPointer = (TextPointer)resolvedAnchor.BoundingStart;
        textPointer.Paragraph.BringIntoView();
    }
}

Private Sub annotationsListBox_SelectionChanged(ByVal sender As Object, ByVal e As SelectionChangedEventArgs)

    Dim comment As Annotation = TryCast((TryCast(sender, ListBox)).SelectedItem, Annotation)
    If comment IsNot Nothing Then
        ' service is an AnnotationService object
        ' comment is an Annotation object
        info = AnnotationHelper.GetAnchorInfo(Me.service, comment)
        Dim resolvedAnchor As TextAnchor = TryCast(info.ResolvedAnchor, TextAnchor)
        Dim textPointer As TextPointer = CType(resolvedAnchor.BoundingStart, TextPointer)
        textPointer.Paragraph.BringIntoView()
    End If
End Sub

See also

• TextAnchor