TextAnchor 类

定义

命名空间:

System.Windows.Annotations

程序集:

PresentationFramework.dll

表示批注所锚定到的内容选择。

public ref class TextAnchor sealed

public sealed class TextAnchor

type TextAnchor = class

Public NotInheritable Class TextAnchor

继承

Object

TextAnchor

示例

请考虑具有批注窗格的简单文档阅读器应用程序。 注释窗格可能是一个列表框，用于显示锚定到文档的批注列表的文本。 如果用户在列表框中选择一项，应用程序将显示相应的批注对象所锚定到的文档段落。

下面的示例演示如何实现充当注释窗格的此类列表框的事件处理程序。

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

注解

TextAnchor 是在流或固定文档中使用便笺和突出显示时返回 ResolvedAnchor 的对象类型。

属性

BoundingEnd	获取文本锚点的结束位置。
BoundingStart	获取文本锚点的开始位置。

方法

Equals(Object)	返回一个值，该值指示文本锚点是否等于指定的对象。
GetHashCode()	返回文本锚点实例的哈希代码。
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)

另请参阅

• IAnchorInfo
• GetAnchorInfo(AnnotationService, Annotation)