How do I get a signal to close the main window?

[Mikeeeeee]

Hi!
How do I get a signal to close the main window?
If I open another window but close the main window, I don't get these closing signals:

self.ui.destroyed.connect(lambda : print(6666666))
self.destroyed.connect(lambda: print(777777777777))

My class:

class MainWindow(QMainWindow):
def __init__(self):
    super(MainWindow, self).__init__()
    self.ui = uic.loadUi("mainWindow.ui")

And not work event :

 def closeEvent(self, event):
        print("closeEvent")

[JonB]

@Mikeeeeee
What are you looking for an answer?

If I open another window but close the main window, I don't get these closing signals:

Qt has a default behaviour of quitting application when the last window is closed, like if you just have a main window. If you have another window open that won't get fired.

[Mikeeeeee]

How do I know that the self.ui window is closed?

[JonB]

@Mikeeeeee
If you want to know when a QWidget is closed, you can sub-class and override the closeEvent(). Closing in itself does not emit any signal, so that is the way to recognise it.

[Mikeeeeee]

@JonB But how do I create a subclass for self.ui?

[JonB]

@Mikeeeeee
You don't, it's not a QWidget! self.ui itself does not close or send signals etc. It owns widgets which do.

[Mikeeeeee]

@JonB So how do I know that "mainWindow. ui" is closed?

[JonB]

@Mikeeeeee
What class is ui.mainWindow? It needs to be your class derived from QMainWindow. Then you go override that class's closeEvent().

I see https://stackoverflow.com/questions/22460003/pyqts-qmainwindow-closeevent-is-never-called is for PyQt4, but look at the solution, I imagine it will be similar for PyQt5/PySide2.