DragAndDrop from RadGridView - tooltip appears when trying to scroll

[Aleksander]

Hey, on RadGridView with scrollbars and DragAndDrop query/info - when I try to scroll - Drag tooltip appears (OnDragQuery) preventing normal scrolling.

e.Options.Source is RadGridView, how to filter scrollbars out of DragDrop when scrolling content of RadGridView?

Thanks,
Alex

[Tsvyatko]

Hi Aleksander,

 You might want to check this help article - http://www.telerik.com/help/wpf/raddraganddrop-disable-drag-when-scrolling.html.

 Let us know if you have any further question or issues regarding this scenario.

Best wishes,
Tsvyatko
the Telerik team

[Aleksander]

Unfortunately, this solution doesn't work.

e.GetElement<System.Windows.Controls.Primitives.ScrollBar>(e.Options.MouseClickPoint)

is always returning null for RadGridView in OnDragQuery

I wrote a workaround myself:

private bool IsScrollBarHit(Visual reference, Point pt)
        {
            var htr = VisualTreeHelper.HitTest(reference, pt);
            var parent = htr.VisualHit;
            while(parent != null && !parent.GetType().Equals(typeof(System.Windows.Controls.Primitives.ScrollBar)))
            {
                parent = VisualTreeHelper.GetParent(parent);
            }
            return parent != null;
        }

and use it in OnDragQuery as:

var pt = YOURRADGRIDVIEW
                .TransformToAncestor(YOURMAINWINDOW)
                .Transform(new Point(0, 0));

            var relPoint = new Point(e.Options.MouseClickPoint.X - pt.X, e.Options.MouseClickPoint.Y - pt.Y);

if (IsScrollBarHit(YOURRADGRIDVIEW, relPoint))
{

e.QueryResult = false;

return;
}
//if (e.GetElement<System.Windows.Controls.Primitives.ScrollBar>(e.Options.MouseClickPoint) != null)
//{
//    e.QueryResult = false;
//    return;
//}

Please check your e.GetElement<T> if it works correctly with RadGridView
Alex

[Tsvyatko]

Hi Aleksander,

 Thank you for sharing this. We will definitively check our code for any issues. Would it be possible to share with us any specifics of the scenario in which the problem occurs - Using element hosts, main window styles applied or popups used.

Kind regards,
Tsvyatko
the Telerik team