Visual.HitTestCore Method

Definition

Determines whether a point or geometry value is within the bounds of the visual object.

Overloads

HitTestCore(GeometryHitTestParameters)

Determines whether a geometry value is within the bounds of the visual object.

HitTestCore(PointHitTestParameters)

Determines whether a point coordinate value is within the bounds of the visual object.

HitTestCore(GeometryHitTestParameters)

Determines whether a geometry value is within the bounds of the visual object.

protected virtual System.Windows.Media.GeometryHitTestResult HitTestCore(System.Windows.Media.GeometryHitTestParameters hitTestParameters);

Parameters

hitTestParameters
GeometryHitTestParameters

A GeometryHitTestParameters object that specifies the Geometry to hit test against.

Returns

A GeometryHitTestResult that represents the result of the hit test.

Examples

The following example shows how to override the HitTestCore(GeometryHitTestParameters) method. One reason you might want to override this method is to provide additional functionality during the hit testing process.

// Override default hit test support in visual object.
protected override GeometryHitTestResult HitTestCore(GeometryHitTestParameters hitTestParameters)
{
    IntersectionDetail intersectionDetail = IntersectionDetail.NotCalculated;

    // Perform custom actions during the hit test processing.

    return new GeometryHitTestResult(this, intersectionDetail);
}

Remarks

You can override default hit testing support for a visual object by overriding the HitTestCore method. This means that when you invoke the HitTest method, your overridden implementation of HitTestCore is called. Your overridden method is called when a hit test falls within the bounding rectangle of the visual object, even if the coordinate falls outside the geometry of the visual object.

Applies to

HitTestCore(PointHitTestParameters)

Determines whether a point coordinate value is within the bounds of the visual object.

protected virtual System.Windows.Media.HitTestResult HitTestCore(System.Windows.Media.PointHitTestParameters hitTestParameters);

Parameters

hitTestParameters
PointHitTestParameters

A PointHitTestParameters object that specifies the Point to hit test against.

Returns

A HitTestResult that represents the Visual that is returned from a hit test.

Examples

The following example shows how to override the HitTestCore(PointHitTestParameters) method. One reason you might want to override this method is to provide additional functionality during the hit testing process.

// Override default hit test support in visual object.
protected override HitTestResult HitTestCore(PointHitTestParameters hitTestParameters)
{
    Point pt = hitTestParameters.HitPoint;

    // Perform custom actions during the hit test processing,
    // which may include verifying that the point actually
    // falls within the rendered content of the visual.

    // Return hit on bounding rectangle of visual object.
    return new PointHitTestResult(this, pt);
}

Remarks

You can override the default hit testing support on visual objects by overriding the HitTestCore method. This means that when you invoke the HitTest method, your overridden implementation of HitTestCore is called. Your overridden method is called when a hit test falls within the bounding rectangle of the visual object, even if the coordinate falls outside the geometry of the visual object.

Applies to