CODEWITHSUNDEEP
macosqtevents
Martin Delille
Martin Delille

Reputation: 11780

No QEvent for ApplicationDeactivate nor ApplicationStateChange

I would like to be notified when the user switch to another application so I use the installEventFilter method to catch the events:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    this->installEventFilter(this);
}

bool MainWindow::eventFilter(QObject *sender, QEvent *event)
{
    qDebug() << event->type();
    return QMainWindow::eventFilter(sender, event);
}

When I switch to another application I get the following events:

Shouldn't I receive ApplicationDeactivate (which seems to be deprecated) or ApplicationStateChange when I switch to another application?

I'm under MacOS and test with the following Qt versions: 5.1.1, 5.2.0, 5.2.1.

Upvotes: 1

Views: 705

Answers (1)

Kuba hasn&#39;t forgotten Monica
Kuba hasn&#39;t forgotten Monica

Reputation: 98435

You should connect to the QGuiApplication::applicationStateChanged signal. If it doesn't fire, that's a bug and should be reported. I don't think you do that, though.

The ApplicationStateChange event is used internally by Qt, you're not supposed to worry about it. It is likely sent to the application instance. Also, all of this is for Qt 5.2.x. For 5.1 and earlier, things are different.

Upvotes: 1

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