Drag from Gridview

[Michael Storchmann]

Hi Guys,

reffering to your WPF-Demo "Tree to Grid Drag": How can I prevent
a Drag-Operation from the GridView by dragging the Header instead of
the item?

The behavior makes no sense. In your corresponding Silverlight-Example
you can´t drag the Header.

Bye, Michael

[Yordanka]

Hello Michael Storchmann,

To prevent dragging of the header cells, you need to disable grouping of the grid on column level by setting IsGroupable to False. 
 
Kind regards,
Yordanka
the Telerik team

[Michael Storchmann]

Hello Yordanka,

sorry, but that is too simple :-) It doesn´t work (Q1/2011, no internal Build).
Look at your WPF-Demo "Tree to Grid Drag", change the RadGridView (x:Name="orderView")
from AutogenerateColumns="True" to "False".

Add:

   <telerik:RadGridView.Columns>
       <telerik:GridViewDataColumn IsGroupable="False" DataMemberBinding="{Binding Name}"  Header="Name"  />
       <telerik:GridViewDataColumn IsGroupable="False" DataMemberBinding="{Binding Description}" Header="Description" />
    </telerik:RadGridView.Columns>

After start the Demo drag e.g. the "Name" ColumnHeader to the TreeView.
It works - but it shouldn´t.




Michael

[Michael Storchmann]

Any help? SP1 has the same (ok, small but confusing) problem.

Michael

[Yordanka]

Hi Michael Storchmann,

Excuse me for the misunderstanding.

We have investigated why the WPF demo header cells can be dragged and it seems that we have missed to exclude GridViewHeaderCell element from the DragAndDrop implementation. This should be done on each DragAndDrop event - OnDragInfo, OnDropInfo, OnDragQuery, OnDropQuery:

if (e.Options.Source is GridViewHeaderCell)
           {
               return;
           }

You can check the corresponding Silverlight demo for a reference. 
 
Best wishes,
Yordanka
the Telerik team

[Michael Storchmann]

Hello Yordanka,

ok, I understand - and I´ve made the changes. There is a small issue:
if I select the Header, the Drag-Operation seems to start. But it isn´t
the Drag-Operation, it is the "IsGroupable"-Operation. It seems the current
version of the GridView doesn´t respect the "IsGroupable=False"-Property.
But for that, it is the wrong forum.

Thanks, Michael