IntersectionDetail Enumeration
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IntersectionDetail Enumeration

 

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)

public enum IntersectionDetail

Member nameDescription
Empty

The Geometry hit test parameter and the target visual, or geometry, do not intersect.

FullyContains

The Geometry hit test parameter is fully contained within the boundary of the target visual or geometry.

FullyInside

The target visual, or geometry, is fully inside the Geometry hit test parameter.

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.

NotCalculated

The IntersectionDetail value is not calculated.

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

Diagram of IntersectionDetail used in hit testing

Intersection between hit test geometry and visual geometry during hit testing

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;
    }
}

.NET Framework
Available since 3.0
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