Disable drop based on source grid

[Peter]

Hi,

I've been using the RowReordering tutorials to implement my drag & drop functionality and I'm trying to prevent certain grids from dropping their draggedItems into a grid. I'm thinking all I need is the target and source grid references, performing a simple comparison or test and show the "disabled" drag effect. I can get the target grid object but not the source grid object from inside the OnDragOver or OnDrop event handlers.

How can I do this? 

Thanks

[Dimitrina]

Hi,

Indeed, the source GridView is not available in the drop arguments. What I can suggest to you is one of those approaches:
1. Get the source GridView when the OnDragInitialize event is raised.
    Save it.
    Use the saved instance when the OnDrop event is raised.

2. Pass the source GridView through the "DropDetails" of the IDragPayload:

IDragPayload dragPayload = DragDropPayloadManager.GeneratePayload(null);
dragPayload.SetData("DropDetails", sourceGridView);

I hope this helps.

Kind regards,
Didie
the Telerik team

[Peter]

Hi,
Thank you, How would you do this with grids on different UI(separate window). From the solution you gave how can I get the "DropDetails" from target Grid. I am using http://demos.telerik.com/silverlight/#TreeListView/TreeListViewDragAndDrop from one window and http://www.telerik.com/help/wpf/raddraganddrop-within-radgridview.html from another window.

Thank you

[Dimitrina]

Hi,

The article that you have pointed to is related to RadDragAndDropManager. As it will not be supported any more, I would suggest you to check our online documentation on DragDropManager and use it instead.

An example on how to dragdrop within GridView and how to set the "DropDetails" please check the source code for the "Reorder Rows" WPF Demo. 

Kind regards,
Didie
the Telerik team