Visual.TransformToAncestor 方法

public:
 System::Windows::Media::Media3D::GeneralTransform2DTo3D ^ TransformToAncestor(System::Windows::Media::Media3D::Visual3D ^ ancestor);

public System.Windows.Media.Media3D.GeneralTransform2DTo3D TransformToAncestor(System.Windows.Media.Media3D.Visual3D ancestor);

member this.TransformToAncestor : System.Windows.Media.Media3D.Visual3D -> System.Windows.Media.Media3D.GeneralTransform2DTo3D

Public Function TransformToAncestor (ancestor As Visual3D) As GeneralTransform2DTo3D

參數

傳回

一種可以用來將座標從 Visual 轉換到視覺物件指定的 Visual3D 祖先的轉換。

public:
 System::Windows::Media::GeneralTransform ^ TransformToAncestor(System::Windows::Media::Visual ^ ancestor);

public System.Windows.Media.GeneralTransform TransformToAncestor(System.Windows.Media.Visual ancestor);

member this.TransformToAncestor : System.Windows.Media.Visual -> System.Windows.Media.GeneralTransform

Public Function TransformToAncestor (ancestor As Visual) As GeneralTransform

參數

傳回

型別 GeneralTransform 的值。

例外狀況

範例

以下標記範例顯示 一個 TextBlock 巢狀於兩個 StackPanel 物件內。

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
  <StackPanel Margin="16">
    <StackPanel Margin="8">
      <TextBlock Name="myTextBlock" Margin="4" Text="Hello, world" />
    </StackPanel>
  </StackPanel>
</Window>

以下程式碼範例展示了如何使用此TransformToAncestor方法取得相對於包含 TextBlock的 的偏移量Window。 偏移值包含在回傳 GeneralTransform的 中。

// Return the general transform for the specified visual object.
GeneralTransform generalTransform1 = myTextBlock.TransformToAncestor(this);

// Retrieve the point value relative to the parent.
Point currentPoint = generalTransform1.Transform(new Point(0, 0));

' Return the general transform for the specified visual object.
Dim generalTransform1 As GeneralTransform = myTextBlock.TransformToAncestor(Me)

' Retrieve the point value relative to the parent.
Dim currentPoint As Point = generalTransform1.Transform(New Point(0, 0))

偏移量考慮了包含 Margin的所有物件的值。Window 在此情況下， X 是28，且 Y 是28。

備註

或者，你也可以用這個 VisualTreeHelper.GetOffset 方法來取得視覺物件相對於父物件的偏移量。 偏移值包含在回傳 Vector 值中。

// Return the offset vector for the TextBlock object.
Vector vector = VisualTreeHelper.GetOffset(myTextBlock);

// Convert the vector to a point value.
Point currentPoint = new Point(vector.X, vector.Y);

' Return the offset vector for the TextBlock object.
Dim vector As Vector = VisualTreeHelper.GetOffset(myTextBlock)

' Convert the vector to a point value.
Dim currentPoint As New Point(vector.X, vector.Y)