在Qt中，您如何正确实现代理？

I followed the model/view/controller paradigm. I am pretty sure that the model and view are right, but I think I'm doing some things wrong in my delegate. Everything "works", except the first click to a control just "lights up the control" and the second one interacts with it. Is this how delegates are usually implemented? My implementation requires a lot of construction and destruction (hidden by scoped_ptr) so any tips on that are also helpful.I followed the model/view/controller paradigm.