How to disable Ctrl + Drag duplicate behavior in WPF Diagram(SfDiagram)?

In the WPF Diagram, you can duplicate SfDiagram elements by either holding the Ctrl key and dragging the element or by pressing Ctrl + D after selecting an element. This is the default behavior. If you want to disable the Ctrl + Drag duplication behavior, you can customize it according to your needs. Here’s a code example to demonstrate how to achieve this:

C# Code Snippet:

public class ViewModel : SfDiagram
{
   // Override to control command execution based on specific conditions
   protected override bool CanExecuteCommand(ICommand command)
   {
       // Check if the command is the Duplicate command
       if (command == (Info as IGraphInfo).Commands.Duplicate)
       {
          // Check if the Ctrl key is pressed
          if (Keyboard.Modifiers == ModifierKeys.Control)
          {
              // Allow execution only if 'D' key is also pressed
              return Keyboard.IsKeyDown(System.Windows.Input.Key.D);
          }
       }
       // For all other commands or conditions, allow execution by default
       return true;
   }
} 

This code customizes command execution for the SfDiagram. The ViewModel class overrides the CanExecuteCommand method to control when commands are allowed to execute. The method checks if the command is the Duplicate command. If it is, the method further checks if the Ctrl key is held down and the D key is pressed simultaneously. Only in this scenario is the “Duplicate” command allowed to execute.

For any other command or if these conditions are not met, the method defaults to allowing the command by returning true.

View Sample in GitHub

Conclusion
I hope you enjoyed learning about how to disable Ctrl + Drag duplicate behavior in the WPF Diagram.
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