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I would like to display a message before QGIS close. But I can't intercept the closeEvent of the main window from my plugin. I've tested this code which doesn't work.

# Main method
QgsApplication.instance().closeEvent = self.mainWindowCloseEvent

def mainWindowCloseEvent(self, event) :
    # displaying message...
    event.ignore()
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  • 1
    The QgsApplication class inherits from QApplication which has the signal aboutToQuit(). Perhaps you can make that work for you?
    – Ben W
    Commented Jan 20, 2021 at 12:59
  • 1
    As @BenW suggested, using aboutToQuit might do the trick, maybe with something like: QgsApplication.instance().aboutToQuit.connect(mainWindowCloseEvent), similar to how you connect qt signals to function in the plugin.
    – Dror Bogin
    Commented Jan 20, 2021 at 13:04
  • Thanks for your responses. It doesn't work, i can't cancel the event or display a message. The documentation says " Note that no user interaction is possible in this state."
    – TrsBar
    Commented Jan 20, 2021 at 13:39
  • I needed something like that before, but I couldn't find any solution. gis.stackexchange.com/questions/162443/…
    – Kadir Şahbaz
    Commented Jan 21, 2021 at 7:24

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