Artemis.ViewModels.Profiles.ProfileEditorViewModel.Drop C# (CSharp) Method

        public void Drop(IDropInfo dropInfo)
        {
            var source = dropInfo.Data as LayerModel;
            var target = dropInfo.TargetItem as LayerModel;
            if (source == null || target == null || source == target)
                return;

            // Don't allow a folder to become it's own child, that's just weird
            if (target.Parent == source)
                return;

            // Remove the source from it's old profile/parent
            if (source.Parent == null)
            {
                var profile = source.Profile;
                source.Profile.Layers.Remove(source);
                profile.FixOrder();
            }
            else
            {
                var parent = source.Parent;
                source.Parent.Children.Remove(source);
                parent.FixOrder();
            }

            if (dropInfo.InsertPosition == RelativeInsertPosition.TargetItemCenter &&
                target.LayerType is FolderType)
            {
                // Insert into folder
                source.Order = -1;
                target.Children.Add(source);
                target.FixOrder();
                target.Expanded = true;
            }
            else
            {
                // Insert the source into it's new profile/parent and update the order
                if (dropInfo.InsertPosition == RelativeInsertPosition.AfterTargetItem ||
                    dropInfo.InsertPosition ==
                    (RelativeInsertPosition.TargetItemCenter | RelativeInsertPosition.AfterTargetItem))
                    target.InsertAfter(source);
                else
                    target.InsertBefore(source);
            }

            UpdateLayerList(source);
        }