I see the difference and my initial explanation may have not been clear. In your example, dragging items from one folder to the next does work. We do not allow dragging items from one folder to another, so I'm not sure if that scenario is working for us or not. We are dragging rows from a grid view and dropping them in a folder. I'm not sure if that should make a difference.
Here is my code-behind. This may help identify what I'm doing wrong, or if I have left something out. I probably should have posted this in the first place. Sorry about that! I'm not the original developer of this code. I just tried to implement the new DragDropManager.
This is the code for allowing Drag from a grid view:
private WeakReferenceOf<DataControl> _dataControl;
public void Initialize(DataControl control)
{
_dataControl = new WeakReferenceOf<DataControl>(control);
ConfigureControl();
}
private void ConfigureControl()
{
DragDropManager.SetAllowDrag(_dataControl.Target, true);
DragDropManager.AddDragInitializeHandler(_dataControl.Target, OnDragInitialize);
}
/// <summary>
/// Start dragging. Create Drag Cue by apllying custom Template
/// </summary>
private static void OnDragInitialize(object sender, DragInitializeEventArgs e)
{
var control = e.Source as DataControl;
if (control == null)
{
e.Handled = false;
return;
}
var items = control.SelectedItems
.Where(si => si as IFolderEntity != null)
.Select(i => i as IFolderEntity)
.ToList();
if (!items.Any())
{
e.Handled = true;
return;
}
var payLoad = DragDropPayloadManager.GeneratePayload(null);
payLoad.SetData("DraggedData", items);
e.AllowedEffects = DragDropEffects.Move;
e.Data = payLoad;
e.DragVisual = null;
e.Handled = true;
}
public void UnregisterEvents()
{
DragDropManager.RemoveDragInitializeHandler(_dataControl.Target, OnDragInitialize);
_dataControl = null;
}
This is the code for TreeView when dropping:
private RadTreeView TreeView { get; set; }
public void Initialize(RadTreeView treeView)
{
TreeView = treeView;
TreeView.ItemPrepared += TreeViewOnItemPrepared;
}
private void TreeViewOnItemPrepared(object sender, RadTreeViewItemPreparedEventArgs e)
{
DragDropManager.RemoveDragOverHandler(e.PreparedItem, OnItemDragOver);
DragDropManager.RemoveDropHandler(e.PreparedItem, OnDrop);
DragDropManager.AddDragOverHandler(e.PreparedItem, OnItemDragOver);
DragDropManager.AddDropHandler(e.PreparedItem, OnDrop);
}
private void OnItemDragOver(object sender, TDragEventArgs e)
{
var item = (e.OriginalSource as FrameworkElement).ParentOfType<RadTreeViewItem>();
item.AllowDrop = false;
var folder = item.GetFolder();
if (folder == null || !folder.FolderTypeCode.CanDrop)
{
e.Handled = true;
return;
}
var draggedData = DragDropPayloadManager.GetDataFromObject(e.Data, "DraggedData");
var fe = ((List<IFolderEntity>)draggedData).FirstOrDefault();
if (fe == null)
{
e.Handled = true;
return;
}
var tmpFolder = folder;
//Loop up the parents until you find the child of the WorkSpace folder
while (tmpFolder.ParentFolder.FolderTypeCode.Id != FolderTypeCode.Workspace.Id)
{
tmpFolder = tmpFolder.ParentFolder;
}
if (tmpFolder.FolderTypeCode.Id != fe.FolderTypeCode.Id)
{
e.Handled = true;
return;
}
item.AllowDrop = true;
e.Handled = true;
}
private void OnDrop(object sender, TDragEventArgs e)
{
var item = (e.OriginalSource as FrameworkElement).ParentOfType<RadTreeViewItem>();
var draggedData = DragDropPayloadManager.GetDataFromObject(e.Data, "DraggedData");
if (draggedData == null) return;
var folderEntities = draggedData as IEnumerable<IFolderEntity>;
if (folderEntities == null) return;
CreateFolderEntities(item, folderEntities);
e.Handled = true;
}