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Normal Topic Modifying selected items issue (Read 1125 times)
Patryk
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Modifying selected items issue
Aug 1st, 2025 at 7:00am
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Hi,

There is a virtual method which I am overriding:

protected override void OnNodeModifying(NodeValidationEventArgs e){}

How to make it available if only one item is selected? I agree it works for more than one item selected.


Of course I am updating the selection class and the active item but still I cant get this event to be raised once moving a single element. More than one is needed.
  
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Slavcho
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Re: Modifying selected items issue
Reply #1 - Aug 1st, 2025 at 7:43am
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Hi,

That's called for a single node too in my test:

Code
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public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        diagramView.Diagram = new DiagramEx();
    }
}

class DiagramEx : Diagram
{
    protected override void OnNodeModifying(NodeValidationEventArgs e)
    {
        Debug.WriteLine("OnNodeModifying");
        base.OnNodeModifying(e);
    }
}


The method's purpose is to raise validation event, and the control might not call it if operation already considered rejected due to other factors (e.g. NodeConstraints property values, or previous rejected validations, say from container/child -related events).

Regards,
Slavcho
Mindfusion
  
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Slavcho
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Re: Modifying selected items issue
Reply #2 - Aug 1st, 2025 at 8:04am
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If your application subclasses DiagramNode and overrides its AllowModify method, make sure it also calls base method for the event to be raised.
  
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