Drag and Drop with RadDiagramShape.Tag valued

[Dario Concilio]

I'm trying to drag&drop from my radlistbox that has ItemSource with my Collection (by MVVM)

I valued RadDiagramShape.Tag property with my object, I would to send this one also.

But into ItemsChanged event I found Tag = null.

How can I do this?

DragDropManager.AddDragInitializeHandler(MacchineDaCaricareRadListBox, OnDragInitialize);

 

private void OnDragInitialize(object sender, DragInitializeEventArgs args)

{

    args.AllowedEffects = DragDropEffects.All;

 

    //RadDiagramShape draggedShape = (args.OriginalSource as ListBoxItem).Content as RadDiagramShape;

    GruppoPianoDiCarico pallet = (args.OriginalSource as RadListBox).SelectedValue as GruppoPianoDiCarico;

 

    RadDiagramShape macchina = new RadDiagramShape()

    {

        Width = pallet.Lunghezza / SCALE,

        Height = pallet.Larghezza / SCALE,

        Content = $"[{pallet.NumeroRiga}] {pallet.Description.ToUpper()}",

        Tag = pallet

    };

    macchina.Geometry = ShapeFactory.GetShapeGeometry(CommonShapeType.RectangleShape);

    macchina.Background = IMBALLO;

    macchina.Foreground = IMBALLO_TITLE;

    macchina.FontWeight = FontWeights.Bold;

    macchina.Stroke = Brushes.Black;

    macchina.StrokeThickness = 1;

    macchina.StrokeDashArray = new DoubleCollection(new Double[] { 5, 1 });

    macchina.FontSize = 20;

 

    List<RadDiagramShape> shapes = new List<RadDiagramShape>();

    shapes.Add(macchina);

    SerializationInfo serializaedInfo = SerializationService.Default.SerializeItems(shapes);

    args.Data = serializaedInfo;

}

 

private void topRadDiagram_ItemsChanged(object sender, DiagramItemsChangedEventArgs e)
{
    [...]

if (e.Action == System.Collections.Specialized.NotifyCollectionChangedAction.Add)
{
foreach (var item in e.NewItems)
{
var currenItem = (RadDiagramShape)item;

//it founds Tag = null!!!!
if (currenItem.Tag.GetType() == typeof(GruppoPianoDiCarico))
{
var macchina = (GruppoPianoDiCarico)currenItem.Tag;

vm.MacchineDaCaricare.Remove(macchina);
vm.MacchineCaricate.Add(macchina);
}
}
}
}

[Petar Mladenov]

Hello Dario,

Tag property is not in the list of properties automatically serialized and deserialized in RadDiagram. Please check the list here. Also, in the following section you will get an idea how to include the Tag serialization in your scenario:

Manual Serialization / Deserialization

Regards,
Petar Mladenov
Progress Telerik