Drag/Drop doesn't work when TreeListView is in RadLayoutControl

2 posts, 0 answers
  1. Non
    Non avatar
    1 posts
    Member since:
    Jul 2017

    Posted 27 Jul 2017 Link to this post


    I've implemented TreeViewDragDropBehavior for TreeListView by using the sample code from Telerik UI for WPF Demo and it's work.

    But when I added the TreeListView into a RadControlLayout, drag/drop events seems stop working. TreeViewDragDropBehavior.OnDragInitialize was fired but nothing happed afterward.

    Any workaround about this?


  2. Martin Ivanov
    Martin Ivanov avatar
    1549 posts

    Posted 31 Jul 2017 Link to this post

    Hello Non,

    The reported behavior appears because RadLayoutControl internally works with DragDropManager and it cancels the drag operation in certain cases. In order to prevent this you can handle the DragInitialize event fired by RadTreeListView. This way the drag/drop opeartion won't bubble to the layout control.
    DragDropManager.AddDragInitializeHandler(this.treeListView, OnTreeListViewDragInitialize);

    private void OnTreeListViewDragInitialize(object sender, DragInitializeEventArgs e)
        e.Handled = true;

    I hope this helps.

    Martin Ivanov
    Progress Telerik
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