QApplication, listen to all mice clicks...

KroMignon

Hi all,

I have developed an Qt/QML application for embedded devices and all works fine.
Some of those devices are used a resistive touch panel which has to be re-calibrated relative often, depending on hardware quality and temperature/humidity.

To not annoying users with touch panel calibration on each application start, I would like to start calibration tool when user hits 10 times the screen in less than 5 seconds.
Is there a way to capture all click events on application level (QApplication, perhaps QGuiApplication??) to be able to count mice clicks and measure elapsed time?

Thanks for any suggestion

Regards

Fabrice

KroMignon

I reply to my self, perhaps there is someone else which have the same kind of issue ;-)

In fact, it is quite easy, the solution is to use install an event filter on application level:

class MouseEventFilter : public QObject
{
    Q_OBJECT
public:
    explicit MouseEventFilter(QObject *parent = 0);

signals:
    void recalibrateTouch();
    
public slots:

    // QObject interface
public:
    bool eventFilter(QObject *object, QEvent *event)
    {
        if(event->type() == QEvent::MouseButtonPress)
        {
            if(m_delay.hasExpired(5000))
            {
                m_clickCounter=0;
                m_delay.start();
            }
            ++m_clickCounter;
            if(m_clickCounter == 10)
                emit recalibrateTouch();
        }
        return QObject::eventFilter(object,event);
    }
    
private:
    int m_clickCounter;
    QElapsedTimer m_delay;
};

Then simply install the event filter on application level like this:

app->installEventFilter(new MouseEventFilter(qApp));

That's it :)
Regards