public void DragOver(IDropInfo dropInfo)
{
bool isCategory = DropEventArgs.IsCategory(dropInfo.TargetItem);
bool isProduct = DropEventArgs.IsProduct(dropInfo.Data);
if (!isCategory && !isProduct)
{
dropInfo.Effects = DragDropEffects.None;
}
else
{
if (isProduct && dropInfo.InsertPosition.HasFlag(RelativeInsertPosition.TargetItemCenter))
{
var parentCategory = (dropInfo.DragInfo.VisualSource as Control)?.DataContext as CategoryVM;
var targetCategory = dropInfo.TargetItem as CategoryVM;
if (parentCategory != targetCategory)
{
dropInfo.Effects = DragDropEffects.Move;
dropInfo.DropTargetAdorner = DropTargetAdorners.Highlight;
}
}
DragDrop.DefaultDropHandler.DragOver(dropInfo);
}
}
public bool CanStartDrag(IDragInfo dragInfo)
{
return(DropEventArgs.IsCategory(dragInfo.SourceItem) || DropEventArgs.IsProduct(dragInfo.SourceItem));
}