/// <inheritdoc />
public override bool AcceptDrop(NSOutlineView outlineView, NSDraggingInfo info, NSObject item, nint index)
{
DebugDragDropPrint("***** OutlineView.AcceptDrop, index: " + index);
var dropLocationTreeNode = item as NSTreeNode;
bool acceptedDrop = dropLocationTreeNode != null;
var viewModel = outlineView.GetInheritedValue <MenuLayoutViewModel>(IFakeDependencyObjectHelpers.DataContextPropertyName);
IEnumerable <FileNodeViewModel> draggedItems = null;
if (acceptedDrop)
{
var newParent = dropLocationTreeNode.GetRepresentedObject() as FolderViewModel;
var pasteboard = info.DraggingPasteboard;
acceptedDrop = newParent != null;
if (acceptedDrop && pasteboard.CanReadItemWithDataConformingToTypes(MenuLayoutPasteboardDataTypeArray))
{
draggedItems = DragDropHelpers.GetDataForType <IEnumerable <FileNodeViewModel> >(pasteboard, MenuLayoutPasteboardDataTypeArray);
if (acceptedDrop)
{
acceptedDrop = newParent.ShouldAcceptDraggedItems(draggedItems.Select(draggedItem => draggedItem.Model));
}
if (acceptedDrop)
{
var firstDraggedItem = draggedItems.First();
var parent = firstDraggedItem.Parent;
var parentViewModel = viewModel.FindViewModelForModel(parent);
if (parentViewModel == newParent)
{
var currentIndex = parent.IndexOfChild(firstDraggedItem.Model);
if (currentIndex < index)
{
--index;
}
}
acceptedDrop = newParent.MoveItems(viewModel, newParent, (int)index, draggedItems);
}
}
else if (acceptedDrop && pasteboard.CanReadItemWithDataConformingToTypes(ProgramDescriptionPasteboardDataTypeArray))
{
var droppedItems = DragDropHelpers.GetDataForType <IEnumerable <ProgramDescriptionViewModel> >(pasteboard, ProgramDescriptionPasteboardDataTypeArray).Select(draggedItem => draggedItem.Model);
newParent.AddItems(viewModel, (int)index, droppedItems);
}
else
{
acceptedDrop = false;
}
DebugDragDropPrint("*** OutlineView drop into: " + newParent);
}
if (acceptedDrop)
{
TreeData.RearrangeObjects();
if ((draggedItems != null) && draggedItems.Any())
{
viewModel.CurrentSelection = draggedItems.FirstOrDefault(i => i.Model != null);
}
}
return(acceptedDrop);
}