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I use the events QEvent::ApplicationActivate and QEvent::ApplicationDeactivate to show/hide some part of my app when needed.

But now, thoses events are flagged as deprecated :

This enum has been deprecated. Use ApplicationStateChange instead.

So I tried to switch to this event. It is triggered when it should, but I can't find a way to get the application state with some sort of cast or any getters.

Any ideas ?

Thomas Ayoub
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1 Answers1

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Just as for any other event, you need to cast it to more specific type to get event properties. The class is QApplicationStateChangeEvent. The documentation is surprisingly silent about it, but it exists and is declared in event.h. The following code works fine in my Qt 5.1 installation:

#include <QApplicationStateChangeEvent>

bool MainWindow::eventFilter(QObject *o, QEvent *e) {
  if (e->type() == QEvent::ApplicationStateChange) {
    qDebug() << "state:" 
             << static_cast<QApplicationStateChangeEvent*>(e)->applicationState();
  }
  return QMainWindow::eventFilter(o, e);
}
Pavel Strakhov
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  • @MartinDelille WindowDeactivate is depreciated but maintained for backwards compatibility. It is only there to keep old Qt programs working, but isn't recommended for use. – Troyseph Jun 05 '15 at 08:55