IntersectionDetail Enum

  • Reference

Definition

Namespace:
System.Windows.Media
Assembly:
PresentationCore.dll

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

public enum class IntersectionDetail
public enum IntersectionDetail
type IntersectionDetail = 
Public Enum IntersectionDetail
Inheritance
Object
ValueType
Enum
IntersectionDetail

Fields

Name Value Description
NotCalculated 0

The IntersectionDetail value is not calculated.
Empty 1

The Geometry hit test parameter and the target visual, or geometry, do not intersect.
FullyInside 2

The target visual, or geometry, is fully inside the Geometry hit test parameter.
FullyContains 3

The Geometry hit test parameter is fully contained within the boundary of the target visual or geometry.
Intersects 4

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.

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;
    }
}

' Return the result of the hit test to the callback.
Public Function MyHitTestResultCallback(ByVal result As HitTestResult) As HitTestResultBehavior
    ' Retrieve the results of the hit test.
    Dim intersectionDetail As IntersectionDetail = (CType(result, GeometryHitTestResult)).IntersectionDetail

    Select Case 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

        Case Else
            Return HitTestResultBehavior.Stop
    End Select
End Function

Remarks

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

Applies to