Mouse selects rows while dragging scroll bar

[IT Department]

We are updating from 2010Q1 to 2011Q1 and I am experiencing some very strange behavior with the scroll bars. If you drag the slider in a scroll bar (vertical or horizontal) and the mouse pointer deviates into the grid cells, the mouse starts selecting rows. This means that the user must be careful to never allow the mouse pointer to wander into the grid while dragging the scroll bar sliders. The scroll bar slider still moves, but normally if you start dragging a scroll bar slider with the mouse that is all that the mouse should do until the pointer is released.

We have full row select and multi-select enabled.

[Emanuel Varga]

Hello Grant,

There is an issue with the latest release, you can use this workaround until the next official release:

BaseGridBehavior baseGridBehavior = this.radGridView1.GridBehavior as BaseGridBehavior;
baseGridBehavior.UnregisterBehavior(typeof(GridViewDataRowInfo));
baseGridBehavior.RegisterBehavior(typeof(GridViewDataRowInfo), new CustomGridDataRowBehavior());

public class CustomGridDataRowBehavior : GridDataRowBehavior
{
    private GridRowElement rowElement;

    protected override bool OnMouseDownLeft(MouseEventArgs e)
    {
        this.rowElement = this.GetRowAtPoint(this.GridViewElement.ElementTree, e.Location);
        return base.OnMouseDownLeft(e);
    }

    public override bool OnMouseMove(MouseEventArgs e)
    {
        if (this.rowElement == null)
        {
            return false;
        }

        return base.OnMouseMove(e);
    }

    private GridRowElement GetRowAtPoint(ComponentElementTree componentTree, Point point)
    {
        RadElement elementUnderMouse = componentTree.GetElementAtPoint(point);

        while (elementUnderMouse != null)
        {
            GridRowElement item = elementUnderMouse as GridRowElement;

            if (item != null)
            {
                return item;
            }

            elementUnderMouse = elementUnderMouse.Parent;
        }

        return null;
    }
}

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga

Telerik WinForms MVP

[Joe Sugden]

Hi,

This workaround worked like a charm on most of our grids, except for one. I suspect it could be because it has children grids, but I'm not sure. Could it be some conflicting property values that prevented the custom behavior from working? 

Has this been fixed yet? We're still on Q1 2011.

Thank you.

[Jack]

Hello Joe,

Thank you for contacting us. Yes, we believe that this issue is addressed in our latest release - Q2 2011 SP1. I would recommend that you try it. However, if you continue to experience the issue, please open a new support ticket and send us your application and we will try to find a proper solution. 

In case you have other questions, we will be glad to help.
 
Kind regards,
Jack
the Telerik team

[Bhakti]

hello can u send me a example of this kind. Im using a radgirdview.

[Jack]

Hello Bhakti,

This issue is addressed in our latest release. I noticed that you are using an old version of RadControls for WinForms and I recommend that you try our latest version - Q1 2013. It contains many new controls and addresses a lot of issues. 

Regarding the described issue, you can check our demo application which contains a handful examples for RadGridView. If you still observe the issue, please describe the exact scenario and send us a sample application where it can be reproduced. We will be glad to help further.

I am looking forward to your reply.

Regards,
Jack
the Telerik team