How to enable or disable custom context menu items based on a node's selection in WPF Diagram (SfDiagram) ?

In the WPF Diagram, you can enable or disable custom context menu items based on a node’s selection by binding the diagram’s built-in commands to the custom context menu items. This binding automatically manages the enabling and disabling of menu items based on the diagram’s selected items. If you are using your commands, you need to implement the CanExecute method to control the enabling and disabling of the menu items according to the node selection.

Code Snippet:

//custom menu items.
DiagramMenuItem edit = new DiagramMenuItem()
{
   Content = "Edit",
   Command = new DelegateCommand(OnEditCommandExecute, CanEditExecute),
};

//Here diagram is the instance of the SfDiagram
diagram.Menu.MenuItems.Add(edit );

//Method to execute edit command.
public void OnEditCommandExecute(object parameter)
{
   //add your own command.
}


//Method to enable/disable the edit menu item based on node's selection count.
public bool CanEditExecute(object param)
{
   //Node selection count.
   int selectedNodesCount = ((diagram.SelectedItems as SelectorViewModel).Nodes as IEnumerable<object>).Count();

   if (selectedNodesCount > 0)
   {
       return true;
   }
   else
       return false;
} 

Context menu in disable state

Context menu in enable state

Conclusion
I hope you enjoyed learning about how to enable or disable custom context menu items based on a node’s selection in the WPF Diagram

You can refer to our WPF Diagram feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.

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