Hello, Mindfusion team. I have some custom logic in my application related to the MouseWheel event (Zoom in, Zoom out). It worked properly in the Diagram class until I put it in a DiagramView. I thought I could handle it by using MouseWheel event on DiagramView, but it is not firing as well. How can I use such events with updated layout?

Hi,

MouseWheel event seems intercepted by the embedded ScrollViewer, maybe with older version you were setting some property on the Diagram's parent ScrollViewer to prevent that. With current version I got wheel handling working via Preview version of the event instead:

<diag:DiagramView
    x:Name="diagramView"
    PreviewMouseWheel="OnPreviewMouseWheel">

        <diag:Diagram x:Name="diagram" />

</diag:DiagramView>

void OnPreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    Debug.WriteLine("OnPreviewMouseWheel");

    var viewPoint = e.GetPosition(diagramView);
    var diagPoint = diagramView.ViewToDiagram(viewPoint);
    diagramView.SetZoomFactor(
        diagramView.ZoomFactor + 5, diagPoint);

    e.Handled = true;
} 

As for behaviors, make sure you are setting DiagramView.Behavior property now. Old Diagram.Behavior should display warning if used. Additionally, in custom behavior implementation call ViewToDiagram method to convert mouse coordinates, instead of e.GetPosition(diagram.DocumentPlane) from older versions.

Regards,
Slavcho
Mindfusion