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Disabling ScrollViewer Drag Trigger

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DragAndDrop
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Matan
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Matan asked on 04 Sep 2014, 02:39 PM
Hi !

I have a RadGridView with attached OnDragInitialize event handler.
When I try to scroll the gridview's scrollviewer then the event is triggered.
How may I disable this?

I've tried this solution:
public void Rad_OnDragInitialize(object sender, Telerik.Windows.DragDrop.DragInitializeEventArgs e)
        {
            RadGridView itemsControl = (RadGridView)sender;
            ScrollViewer scroll = UIHelpers.GetScrollViewer(itemsControl) as ScrollViewer;
            GridViewVirtualizingPanel presenter = UIHelpers.GetItemsPresenter(itemsControl);
             
            if (presenter != null && scroll != null && scroll.IsMouseOver && !presenter.IsMouseOver)
            {
                return;
            }
.............

The event isn't triggered anymore but the scrollviewer won't move at all.

thanks,
Idan

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Nick
Telerik team
answered on 04 Sep 2014, 03:42 PM
Hello Matan,

You have set AllowDrag to the whole RadGridView instead of just the Rows. You have to set AllowDrag to true on the rows only.
<Style TargetType="telerik:GridViewRow"
                   x:Key="DraggedRowStyle">
                <Setter Property="telerik:DragDropManager.AllowDrag"
                        Value="True" />
            </Style>


This will take care of the problem of ScrollViewer trying to start the drag.

Hope this makes sense. 

Regards,
Nik
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Matan
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Nick
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