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IntersectionDetail Enumeration

.NET Framework 4.5

Provides information about the intersection between the geometries in the GeometryHitTestParameters and the visual which was hit.

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

Syntax

C++

public enum IntersectionDetail

XAML Attribute Usage

<object property="enumerationMemberName" .../>

Members

	Member name	Description
	NotCalculated	The IntersectionDetail value is not calculated.
	Empty	The Geometry hit test parameter and the target visual, or geometry, do not intersect.
	FullyInside	The target visual, or geometry, is fully inside the Geometry hit test parameter.
	FullyContains	The Geometry hit test parameter is fully contained within the boundary of the target visual or geometry.
	Intersects	The Geometry hit test parameter and the target visual, or geometry, intersect. This means that the two elements overlap, but neither element contains the other.

Remarks

The following illustration shows the relationship between the hit test geometry (the blue circle) and the visual geometry (the red square).

Intersection between hit test geometry and visual geometry during hit testing

Diagram of IntersectionDetail used in hit testing

Examples

The following example shows how to use the IntersectionDetail property of GeometryHitTestResult.

// Return the result of the hit test to the callback. 
public HitTestResultBehavior MyHitTestResultCallback(HitTestResult result)
{
    // Retrieve the results of the hit test.
    IntersectionDetail intersectionDetail = ((GeometryHitTestResult)result).IntersectionDetail;

    switch (intersectionDetail)
    {
        case IntersectionDetail.FullyContains:

            // Add the hit test result to the list that will be processed after the enumeration.
            hitResultsList.Add(result.VisualHit);

            return HitTestResultBehavior.Continue;

        case IntersectionDetail.Intersects:

            // Set the behavior to return visuals at all z-order levels. 
            return HitTestResultBehavior.Continue;

        case IntersectionDetail.FullyInside:

            // Set the behavior to return visuals at all z-order levels. 
            return HitTestResultBehavior.Continue;

        default:
            return HitTestResultBehavior.Stop;
    }
}

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

System.Windows.Media Namespace

Other Resources

How to: Hit Test Using Geometry as a Parameter

Hit Testing in the Visual Layer

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