Using QProgressBar

[faldzip]

I can't do what you've said, because the long operation comes from a GUI operation. I've a QTableView and I asign it a model that contains one hundred columns and fifteen rows. The asignment of the model to the view makes the app slow.

okay, so it means your model is containing a lot of data, so I would suggest you making your own model which would do some lazy/delayed data loading:
1. You set your model to a view when it is still empty, so as fast as light :]
2. Now fire some method in model - let's call it load() - to load the data, lets say row by row, the loading is done in separate thread.
3. Your view can be updated on each row added (rowsInserted() and something like this).
4. The progress bar can be displayed until loading is finished.

This probably will take longer then just setting model like you have done it now, but will not freeze your GUI.

[gutiory]

Problem solved guys.
Thanks a lot for your answer. You were completly right. The solution is creating a method that partially load data. The behavior of the app is the same I thought, but every content appears inmediatly.
I've learnt so many things because of this problem.

Thanks a lot again and sorry for answering so late.

Regards.