Registering Add and Delete callbacks for List Box

The List Box provides the following APIs to register callbacks for use with the Add and/or Delete buttons:

• SetAddHandler
• SetDeleteHandler

Note

You must register the callbacks for the Add and Delete buttons in initialize_cb, after the List Box instance is fetched — otherwise an error message is generated.

Example (VB.NET)

Public Sub initialize_cb()
Try
     listBox0 = CType(theDialog.TopBlock.FindBlock("listBox0"), NXOpen.BlockStyler.ListBox)
     listBox0.SetAddHandler(AddressOf addButtonEvent)
     listBox0.SetDeleteHandler(AddressOf deleteButtonEvent)

Catch ex As Exception
'---- Enter your exception handling code here -----
      theUI.NXMessageBox.Show("Block Styler", NXMessageBox.DialogType.Error, ex.ToString)
End Try
End Sub

Function addButtonEvent(ByVal listBlock As BlockStyler.ListBox) As Integer

// User Implementation
Return 0

End Function

Function deleteButtonEvent(ByVal listBlock As BlockStyler.ListBox) As Integer

// User Implementation
Return 0

End Function

Notes

• The return value of the Add event handler function is unused.
• The return value of the Delete event handler function is used to negate the deletion (i.e., returning a non-zero/failure value can veto the delete).