Originally Posted by Baertram
Is there a difference between setting the handler via XML, or creating the controls in the lua script and assigning the handlers there?
In what cases should we use XML definitions then.
And how are we supposed to define it in an XML file?
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Defining a handler in XML would set it on the control at the control's creation, which in the case of a non-virtual control would be during the load screen, which would hide any cost. This is pretty much the same as doing it in Lua during the add-on loading process. The main thing to avoid would be making a new closure and calling SetHandler with it frequently. Unless you're closing over local variables with the closure you should be able to only call SetHandler once on a control (for each handler type). If you are closing over local variables then you may want to consider not doing that, and storing the values on the control instead.