Drag from GridView in ChildWindows

3 posts, 0 answers
  1. Alessandro
    Alessandro avatar
    12 posts
    Member since:
    Sep 2008

    Posted 23 Dec 2010 Link to this post

    I'm trying to setup drag and drop in a ChildWindow. In this moment all works fine if I drag from a Treeview to listboxs.
    I have setup this event handler for the treeview:

    RadDragAndDropManager.AddDragInfoHandler(trv, AddressOf OnTrwDragInfo)

    And the event handler is the seguent:

    Private Sub OnTrwDragInfo(ByVal sender As Object, ByVal e As DragDropEventArgs)
    If e.Options.Status = DragStatus.DragInProgress Then
    If e.Options.ParticipatingVisualRoots.Contains(Me) = False Then
    End If
    End If
    End Sub

    I'm trying to do the same thing, but with a GridView as source control.
    In the XAML I have edit the style for the GridViewRow:

    <Style TargetType="telerik:GridViewRow">
    <Setter Property="telerik:RadDragAndDropManager.AllowDrag" Value="True" />

    In code behind I have added the event handler for the GridView too:

    RadDragAndDropManager.AddDragInfoHandler(grvItems, AddressOf OnTrwDragInfo)

    However the drag and drop doesn't work. In debug I have seen that the when I drag from the GridView, the function OnTrwDragInfo was never called. The treeview (in the same ChildWindow) works fine.

    Any ideas?

    P.S. I've tested the latest internal buld too, but I have the same problem.
  2. Tsvyatko
    Tsvyatko avatar
    832 posts

    Posted 24 Dec 2010 Link to this post

    Hi Alessandro,

    Unlike the TreeView, RadGridView does not have build-in row reorder/drag and this functionality needs to implemented.

    I have prepared simple application demonstrating how to achieve this. In it  I am using our new property  - AutoDrag (available in the internal builds and in the upcoming service pack) which simplifies and reduces the code needed to implement drag/drop operations.

    Please, have a look at the attachment and let me know if you need any further assistance.

    the Telerik team
    Browse the videos here>> to help you get started with RadControls for Silverlight
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  4. Alessandro
    Alessandro avatar
    12 posts
    Member since:
    Sep 2008

    Posted 03 Jan 2011 Link to this post

    Your sample works fine.
    However when I try to replicate the drag and drop in my project, the drag and drop doesn't works.

    Now in the interface, I see the rows that are dragged, but in debug I have seen that the OnDropInfo event handler it's never called and so I can't complete the drag and drop.

    How can I try to fix this problem?
    Why the OnDropInfo event handler isn't called?

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