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Scrollbar & Drag&Drop

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GridView
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Ludovic Alcala
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Ludovic Alcala asked on 26 Mar 2010, 10:53 AM
Hello,
when i scroll in my radgridview, i cannot block the drag of my elements.
I manage my dragged elements by RadDragAndDropManager like that :

ctor()
{
RadDragAndDropManager.AddDragQueryHandler(ListingProductGridView, OnRadGridViewDrag);
RadDragAndDropManager.AddDragInfoHandler(ListingProductGridView, OnRadGridViewDragInfo);
}



and in events :
private void OnRadGridViewDragInfo(object sender, DragDropEventArgs e)
        {
            RadGridView gridView = sender as RadGridView;
            IEnumerable draggedItems = e.Options.Payload as IEnumerable;
            if (e.Options.Status == DragStatus.DragInProgress)
            {
                TreeViewDragCue cue = new TreeViewDragCue();
                cue.ItemTemplateSelector = new ProductCategoryTemplateSelector() { MySize = ProductCategoryTemplateSelector.Size.Large };
                cue.ItemsSource = draggedItems;
                e.Options.DragCue = cue;
            }
            else if (e.Options.Status == DragStatus.DragComplete)
            {
                // Fin d'opĂ©ration de dragging

            }
        }
        private void OnRadGridViewDrag(object sender, DragDropQueryEventArgs e)
        {
            RadGridView gridView = sender as RadGridView;
            if (gridView != null)
            {
                IList selectedItems = gridView.SelectedItems.ToList();
                e.QueryResult = selectedItems.Count > 0;
                e.Options.Payload = selectedItems;
                e.QueryResult = true;
                e.Handled = true;
            }

        }


 But when i scroll, i have my dragged items on the scrollbar, can i block that ?

Thank you.





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Tsvyatko
Telerik team
answered on 29 Mar 2010, 09:24 AM
Hi Ludovic Alcala,

Please check the attached project. It demonstrates how to avoid dragging when performing scroll. The idea is to get the element below the mouse when the drag starts. It can be achieved using the following code:
if (e.Options.Status == DragStatus.DragQuery)
{
    e.Options.ArrowCue = RadDragAndDropManager.GenerateArrowCue();
    var element = e.GetElement<ScrollBar>(e.Options.MouseClickPoint);
    e.QueryResult = e.QueryResult.Value && element == null;
}


Regards,
Tsvyatko
the Telerik team

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Ludovic Alcala
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answered on 29 Mar 2010, 09:31 AM
Thank you, it works :)
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GridView
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Ludovic Alcala
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Tsvyatko
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Ludovic Alcala
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