private void ScrollViewer_Drop(object sender, DragEventArgs e)
{
string data = (string)e.Data.GetData(DataFormats.Text);
if (data.Contains("Materia::Layer::"))
{
Point p = e.GetPosition(ScrollView);
double offset = ScrollView.VerticalOffset;
double realY = offset + p.Y;
LayerItem orig = LayerStack.Children.OfType <LayerItem>().FirstOrDefault(m => data.Contains(m.Item.Id));
if (orig == null)
{
return;
}
LayerStack.Children.Remove(orig);
bool added = false;
for (int i = 0; i < LayerStack.Children.Count; ++i)
{
LayerItem item = LayerStack.Children[i] as LayerItem;
if (item == null)
{
continue;
}
if (item == orig)
{
continue;
}
Point relative = item.TransformToAncestor(LayerStack).Transform(new Point(0, 0));
if (realY >= relative.Y && realY <= relative.Y + item.ActualHeight)
{
LayerStack.Children.Insert(i, orig);
//update graph layer data as well
Current.Layers.Remove(orig.Item);
Current.Layers.Insert(i, orig.Item);
added = true;
break;
}
}
if (!added)
{
LayerStack.Children.Add(orig);
Current.Layers.Remove(orig.Item);
Current.Layers.Add(orig.Item);
}
Current?.CombineLayers();
}
}