Pause Qt Symbian application when suspended in background



  • I am developing Qt application on symbian^3 device.
    I have timer loop where I render graphics to the screen.
    I have captured EEventFocusGained and EEventFocusLost events and I stop timer-loop when application has lost focus and start timer when focus is gained. I have done things like in this article:

    "http://www.developer.nokia.com/Community/Wiki/TSQ001585_-Detecting_focus_lost&gained_events_in_Qt_for_Symbian":http://www.developer.nokia.com/Community/Wiki/TSQ001585-Detecting_focus_lost&_gained_events_in_Qt_for_Symbian

    My application stops updating the screen when focus is lost.

    I have made part of user inteface with QML.

    I am trying to publish this application in ovi store but QA still fails saying that timer-loop does not stop when application is suspended in background.

    Is there some other events that I should capture or some other things' that I should take care?



  • Not very cross platform at all. I use this:

    @
    ApplicationActive::ApplicationActive(QObject *parent) :
    QObject(parent)
    {
    appActive = true;
    }

    bool ApplicationActive::isActive() {
    return appActive;
    }

    bool ApplicationActive::eventFilter(QObject *object, QEvent *event)
    {
    //qDebug() << event->type();
    if (event->type() == QEvent::ApplicationActivate || event->type() == QEvent::WindowActivate) {
    qDebug() << "Active";
    appActive = true;
    }

    if(event->type() == QEvent::ApplicationDeactivate || event->type() == QEvent::WindowDeactivate) {
         qDebug() << "Hidden";
        appActive = false;
    }
    
    emit isActiveWindowChanged();
    
    return false;
    

    }
    @

    then in main.cpp

    @
    ApplicationActive aa;
    viewer.installEventFilter(&aa);
    viewer.rootContext()->setContextProperty("application",&aa);
    @

    Then from your QML you can check if you should trigger your timer event with application.isActive()



  • Thanks' for that information.
    I will try with it.
    In few days we will see what the QA says.


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