Diagram inside ItemsControl, Drag&Drop does not work

[fabrizio]

HI, i've applied many updates of dll in last two years but never changed the
code of my application, the D&D was working fine in last deploy 2
years ago. Some update introduced the issue but i don't know which one.


I added a little demo with the issue. If u drag the button (new node)
from the ribbons inside the diagram the OnDiagramDrop event in the
diagram does not fire as expected. The handler is attached to the
diagram in the loaded event.


Can someone help me to understand what's is wrong?

https://onedrive.live.com/redir?resid=693FAA40086B78A%219872



Thanks.

[Martin Ivanov]

Hello Fabrizio,

The default implementation of the Drop event handler of the diagram handles the event (sets the e.Handled property of the arguments to True). This is why the OnDiagramDrop() event handler is never executed. In order to resolve this you can set the last argument (handledEventsToo parameter) of the DragDropManager.AddDropHandler() method to True.

DragDropManager.AddDropHandler(sender as RadDiagram, OnDiagramDrop, true);

This will ensure that the event will be executed even if is handled.

Please try this and let me know if it helps.

Regards,
Martin
Telerik

 

 

[fabrizio]

ok it works