Catching close events in QML or C++

s710

Is there a way to get a signal when the user closes an app? (not backgrounding, but complete app close)
Doesn't matter if its via QML or C++, both would be fine for me.

flohack

Humm lets try the obvious child, how about the destructor of QApplication? See https://stackoverflow.com/questions/4381841/qt-how-to-intercept-the-applications-close-event-if-theres-one

s710

@flohack And in the destructor of the QApplication, will the QML engine and all the stuff still exist and work?

[edit] Maybe I should have mentioned that, while C++ is an option, I need to trigger actions in QML, namely stopping MediaPlayer playback.

flohack

Oh well
Maybe better then to hook https://doc.qt.io/qt-5/qquickwindow.html#closing ? Or similar, Google will help you out.

s710

@flohack Yeah well, as I said, I don't have a window. I have a QQuickView or a Ubuntu.Components MainView.
I have already googled quite a bit and tried several solutions, but none worked, thats why I ask here.

flohack

@s710 Well they should be derived and as such have that event too. Did you try out to subscribe ?

s710

@flohack Yep.

qrc:/Main.qml:20:4: Cannot assign to non-existent property "onClosing"

lduboeuf

Maybe play with applicationState : see https://stackoverflow.com/questions/50845884/how-to-listen-to-qguiapplicationapplicationstatechanged-signals-directly-in-a

s710

@lduboeuf This works, but it does not provide any info about the app closing. Only active/inactive/hidden/suspended.

s710

Got it, after googling even more. Some guy at the QT forum revealed:

   Connections {
      target: Qt.application

      onAboutToQuit: {
         audioPlayer.stop()
      }

This works