Scroll problem when Grid's cell contains TreeView

[Jakub]

Hi,

I have a little problem with my scroll on RadGridView. One of my column's cell template is RadTreeView. When mouse is over tree, mouse-wheel move does not take affect on RadGridView scroll. When mouse is over any other cell, mouse-wheel scroll works correct, like always. It looks like RadTreeView inside cell is stealing mouse-wheel event and RadGridView doesn't scroll? Because my cell height is adjusting itself to RadTreeView size, there is no scroll bars inside cell, it is ok, I want scroll only on RadGridView.

 

Thanks for any help!

[Dinko | Tech Support Engineer]

Hello Jakub,

Thank you for contacting us.

What I can suggest you is to subscribe to the PreviewMouseWheel event of the RadTreeView. In the event handler, you can handle the event and raise the event to its parent. This way when you are over a tree view its parent will be scrolled, which in your case is the RadGridView control.

<telerik:RadTreeView PreviewMouseWheel="RadTreeView_PreviewMouseWheel"/>

private void RadTreeView_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    if (!e.Handled)
    {
        e.Handled = true;
        var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta) { RoutedEvent = MouseWheelEvent, Source = sender };
        var parent = ((Control)sender).Parent as UIElement;
        if (parent != null)
        {
            parent.RaiseEvent(eventArg);
        }
    }
}

I have created sample project which demonstrates the above approach and attached it to this reply.

Regards,
Dinko
Progress Telerik

[Jakub]

Hi Dinko,

works as it should, thanks a lot!