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POWPF hit testing UserControl and geometry
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  1. POWPF hit testing UserControl and geometry
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    copied!<p>I'm trying to make hit testing work between one user control and another user control. I was looking at other questions and found that I have to put this in my user control.</p> <pre><code>Protected Overrides Function HitTestCore(hitTestParameters As System.Windows.Media.PointHitTestParameters) As System.Windows.Media.HitTestResult Return New PointHitTestResult(Me, hitTestParameters.HitPoint) End Function </code></pre> <p>I also have a filter which correctly shows the controls I want to hit-test somehow the <code>htcallback</code> isn't working.</p> <p>Because I can't hit-test with my user control, I made a rectangle on the same spot and use that in my hit test. This doesn't seem to be working.</p> <pre><code>Dim hitTestGeometry = New RectangleGeometry() hitTestGeometry.Rect = New Rect(_selected.breedte, _selected.hoogte, Canvas.GetLeft(_selected), Canvas.GetTop(_selected)) Dim pt As New Point VisualTreeHelper.HitTest(WorkFlowCanvas, New HitTestFilterCallback(AddressOf wcFilter), New HitTestResultCallback(AddressOf verplaatsing), New GeometryHitTestParameters(hitTestGeometry)) </code></pre> <p>I based my answer on this third reply. <a href="https://stackoverflow.com/questions/3411910/problem-with-visualtreehelper-hittest-in-wpf/7162443#7162443">Problem with VisualTreeHelper.HitTest in WPF</a></p> <p>What does he mean with this </p> <blockquote> <p><em>if you want to hit-test against geometry you need to override that second overload as well</em></p> </blockquote>
 

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