VisualTreeHelper.HitTest Method (Visual, Point)

 

Returns the topmost Visual object of a hit test by specifying a Point.

Namespace:   System.Windows.Media
Assembly:  PresentationCore (in PresentationCore.dll)

Public Shared Function HitTest (
	reference As Visual,
	point As Point
) As HitTestResult

Parameters

reference
Type: System.Windows.Media.Visual

The Visual to hit test.

point
Type: System.Windows.Point

The point value to hit test against.

Return Value

Type: System.Windows.Media.HitTestResult

The hit test result of the Visual, returned as a HitTestResult type.

The VisualHit property of the return value represents the Visual object that was hit.

System_CAPS_noteNote

It is possible for a hit test that starts in a 2D visual tree to return RayHitTestResult, which is a 3D hit test result object. Hit testing that starts in a 2D visual tree seamlessly extends into any defined 3D visual tree.

The following example shows how to use the HitTest method to hit test the objects within a Canvas.

' Respond to the left mouse button down event by initiating the hit test.
Private Overloads Sub OnMouseLeftButtonDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs)
	' Retrieve the coordinate of the mouse position.
	Dim pt As Point = e.GetPosition(CType(sender, UIElement))

	' Perform the hit test against a given portion of the visual object tree.
	Dim result As HitTestResult = VisualTreeHelper.HitTest(myCanvas, pt)

	If result IsNot Nothing Then
		' Perform action on hit visual object.
	End If
End Sub

.NET Framework
Available since 3.0
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