PointHitTestParameters(Point) 构造函数

定义

命名空间:

System.Windows.Media

程序集:

PresentationCore.dll

使用 PointHitTestParameters 初始化 Point 类的一个新实例。

public:
 PointHitTestParameters(System::Windows::Point point);

public PointHitTestParameters (System.Windows.Point point);

new System.Windows.Media.PointHitTestParameters : System.Windows.Point -> System.Windows.Media.PointHitTestParameters

Public Sub New (point As Point)

参数

point

Point

指定为 Point 值的参数。

示例

以下示例演示如何使用PointHitTestParameters值调用HitTest。

// Respond to the right mouse button down event by setting up a hit test results callback.
private void OnMouseRightButtonDown(object sender, MouseButtonEventArgs e)
{
    // Retrieve the coordinate of the mouse position.
    Point pt = e.GetPosition((UIElement)sender);

    // Clear the contents of the list used for hit test results.
    hitResultsList.Clear();

    // Set up a callback to receive the hit test result enumeration.
    VisualTreeHelper.HitTest(myCanvas, null,
        new HitTestResultCallback(MyHitTestResult),
        new PointHitTestParameters(pt));

    // Perform actions on the hit test results list.
    if (hitResultsList.Count > 0)
    {
        Console.WriteLine("Number of Visuals Hit: " + hitResultsList.Count);
    }
}

' Respond to the right mouse button down event by setting up a hit test results callback.
Private Overloads Sub OnMouseRightButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
    ' Retrieve the coordinate of the mouse position.
    Dim pt As Point = e.GetPosition(CType(sender, UIElement))

    ' Clear the contents of the list used for hit test results.
    hitResultsList.Clear()

    ' Set up a callback to receive the hit test result enumeration.
    VisualTreeHelper.HitTest(myCanvas, Nothing, New HitTestResultCallback(AddressOf MyHitTestResult), New PointHitTestParameters(pt))

    ' Perform actions on the hit test results list.
    If hitResultsList.Count > 0 Then
        Console.WriteLine("Number of Visuals Hit: " & hitResultsList.Count)
    End If
End Sub