Running code in the main loop

Question

I need a way to run an update function of my own in the main thread. I couldn\'t find a signal that would tick me every time the main loop runs.

Am I doing this wr

Answer 1

Alternatively, if you want to execute your code every time the event loop runs you can use the slot method invocation via the queued connection:

class EvtLoopTicker : public QObject
{
    Q_OBJECT
public:

    EvtLoopTicker(QObject *pParent = nullptr)
        : QObject(pParent)
    {}

public slots:

    void launch()
    {
        tickNext();
    }

private slots:

    void tick()
    {
        qDebug() << "tick";

        // Continue ticking
        tickNext();
    }

private:

    void tickNext()
    {
        // Trigger the tick() invokation when the event loop runs next time
        QMetaObject::invokeMethod(this, "tick", Qt::QueuedConnection);
    }

};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    EvtLoopTicker ticker;
    ticker.launch();

    return a.exec();
}