private void OnPreviewDragOver(object sender, DragEventArgs dragEventArgs) { if (!dragEventArgs.Data.GetDataPresent(typeof(TDataItem))) { return; } _dragAdorner?.Update(dragEventArgs.GetPosition(AssociatedObject)); }
private void InitializeAdornerTemplate(DragEventArgs dragEventArgs, TDataItem data) { if (data == null) { return; } if (DragDataTemplate == null) { return; } if (_dragAdorner != null) { return; } var adornerLayer = AdornerLayer.GetAdornerLayer(AssociatedObject); _dragAdorner = new DragAdorner(data, DragDataTemplate, AssociatedObject, adornerLayer); _dragAdorner?.Update(dragEventArgs.GetPosition(AssociatedObject)); }