How to use QProgressBar correctly

[SixDegrees]

Are you using a QProgressBar or a QProgressDialog? The former needs to be created, placed into a layout and shown before it is visible; the latter provides all that infrastructure for you by placing the progress bar into a dialog.

You probably won't need to call processEvents, but if you do you don't want to call it any more often than is necessary to ensure timely progress bar updates. It's impossible to tell from the code sketch you provided where this should be - it could be just inside the while loop, just inside the outermost for loop, in the innermost for loop, or perhaps when the value of counter modulus some number equals zero. But you certainly don't want to call it every time counter gets incremented.

[jshafferman]

Thanks SixDegress! I didn't know that you had to place the QProgressBar into the layout before it was visible, this would be the reason I am not seeing it when the application starts the heavy lifting process.

I don't think I need to use processEvents at all but if I wanted to I think if I used it on the outer while loop I would get the intended response. Thank you very much for clearing that up for me! I have used QProgressDialog before so I had assumed they worked the same only one was a dialog with options while the other had no options just the progress bar.

Quick question however, if this is happening in MainWindow (which is sublcass of QMainWindow) do I just add it to the main layout. The MainWindow's central widget is a QSplitter so I am not sure how to do this because I want the progress bar to be centered in the main widget. Thanks for any additional help.

[SixDegrees]

If you want your progress bar centered on top of the main window, I'd suggest using the QProgressDialog again. Giving it the main window as parent will start it off centered over that widget, and if you want the window blocked you can set it to be modal, or non-modal otherwise.

[jshafferman]

Thanks I will go ahead and use the QProgressDialog again, is there anyway to hide the buttons on the QProgressDialog? I know I can simply not react to any signal being sent by a click but I am curious if there is a 'hide' option. Thanks again for your help!

[jshafferman]

I figured out how to remove the cancel button, setCancelButton(0) removes the Cancel button