avoid remove nodes with cancel key

[Fabrizio]

hi all, hope u can help me, i tried this code but the event is never fired

 <telerik:RadDiagram x:Name="diagram"
                            Grid.Row="1"
                            ActiveTool="PanTool"
                            ShapeStyle="{StaticResource TestNodeStyle}"
                            KeyDown="diagram_KeyDown"/>

 private void diagram_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Cancel)
                e.Handled = true;
        }

thanks,

[Tina Stancheva]

Hello Fabrizio,

The KeyDown and PreviewKeyDown events are handled internally by the RadDiagram. This is why if you need to customize their default logic, you'll have to add their handlers in code behind, specifying that you need your custom handlers to be executed even if the events are already handled by someone else:

this.AddHandler(RadDiagram.KeyDownEvent, new KeyEventHandler(OnDiagramKeyDown), true);

Also, in order to handle a delete event triggered by the keyboard, you'll have to handle the PreviewKeyDown event rather than the KeyDown event. And if you'd like to deny any delete operation on the shapes, you can set the RadDiagramShape.AllowDelete property to False. You can also disable the delete operation on the entire diagram object by setting the RadDiagram.AllowDelete property to False.

I attached a sample solution demonstrating how to disable a Delete key deletion of a shape/connection. Let me know if it helps.

Regards,
Tina Stancheva
the Telerik team

[Fabrizio]

AllowDelete is what i need.

thanks.