Refresh the mainwindow / functions called in the main loop

Hi guys,

I have this situation:

I have a QMainWindow that contains a QToolBar and a QMenuBar.

I need to disable them, do some computation and enable them again after that.

The problem is that the code:

Code:

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menuBar()->setDisable(true);
myToolBar_->setDisable(true);
 
// do a lot of computation
 
menuBar()->setDisable(false);
myToolBar_->setDisable(false);

---

doesn't work. I guess the QMainWindow has a loop and the operations to refresh everything are called only at the end of this loop.
It should work if the mainwindow internal loop is accessed two times or if I call a function to force the update.

I have tried to call both update(), refresh() and show() (both of the mainWindow and of the other widgets) but I didn't succeed.

Do you know anything I can do about that?

I have also tried to use signals and slots but even in this way it didn't work...


Cheers

May be this could help, if you call this method before doing computation, it should refresh you GUI.
http://doc.qt.io/qt-4.8/qcoreapplication.html#processEvents

Be advised that blocking the event processing of the UI thread is usually not a very good idea, since you program will stop responding to any kinds of events.
No user interaction, no redrawing, no timers, no sockets, etc.

Cheers,
_

Quote:

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Originally Posted by nix

May be this could help, if you call this method before doing computation, it should refresh you GUI.
http://doc.qt.io/qt-4.8/qcoreapplication.html#processEvents

---

Uhm ok, thank you. It's a method of the QCoreApplication so I assume I should pass a reference to it in my mainwindow, right?

Quote:

---

Originally Posted by anda_skoa

Be advised that blocking the event processing of the UI thread is usually not a very good idea, since you program will stop responding to any kinds of events.
No user interaction, no redrawing, no timers, no sockets, etc.

Cheers,
_

---

I appreciate your suggestions and yes, maybe it would be better to process all this data in a thread but I don't need the GUI when doing the computation (they just load stuff).

For all the real computation I am using threads indeed.


Thank you again

Quote:

---

Uhm ok, thank you. It's a method of the QCoreApplication so I assume I should pass a reference to it in my mainwindow, right?

---

No, it's a static method, just do QCoreApplication::processEvents();

Quote:

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Originally Posted by nix

No, it's a static method, just do QCoreApplication::processEvents();

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Just tried.

No difference at all.. Don't know why

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Added after 40 minutes:

Just notice that if I do:

Code:

---

this ->update();
  this ->repaint();
  QCoreApplication::processEvents();

---

The toolbar greys out but not the menubar

Since you don't need your UI at all, have you tried

Code:

---

this->setEnabled(false);

---

i.e. disabling the whole window?

Or instead of disabling, showing a modal progress dialog?

Cheers,
_

Quote:

---

Originally Posted by anda_skoa

Since you don't need your UI at all, have you tried

Code:

---

this->setEnabled(false);

---

i.e. disabling the whole window?

Or instead of disabling, showing a modal progress dialog?

Cheers,
_

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Yep, I have tried both.

Disabling the whole window doesn't change anything.

Showing a modal dialog should be fine but I'd prefer a different solution.