QPushButton touchscreen problem



  • Goodmorning to all,
    I'm trying to create a GUI program using QTcreator. I've bought a Waveshare 3.5 display and I started making some widgets.
    I've got a problem with the touchscreen. If I connect a mouse everything is fine and I received signals on my slot functions:

    void MainWindow::on_pushButton_clicked()
    {
    qDebug("button pressed");
    }

    void MainWindow::on_pushButton_released()
    {
    qDebug("button release");
    }

    But if I use touchscreen, instead, QPushButtons slots aren't called and the drawing doesn't get updated. However I can see that events:

    void MainWindow::mousePressEvent(QMouseEvent *event)
    void MainWindow::mouseMoveEvent(QMouseEvent *event)
    void MainWindow::mouseReleaseEvent(QMouseEvent *event)

    are called correctly. Moreover if I create a QDial widget, the touchscreen works as with mouse.
    Looking in the internet, some people had a similar problem that has been resolved calling setAttribute(Qt::WA_AcceptTouchEvents, false); but for me it doesn't work.

    Can you help me?
    Thank you in advanced.


  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Please provide more information about your hardware/software setup.

    What version of Qt ?
    What OS are you running ?
    If Linux, what distribution ?
    What input driver are you using ?
    What device are you running on ?



  • @SGaist Hello SGaist,
    thank you very much for your answer. I've build an OS image and sdk with yocto poky-morty so that I could cross compile my applications for a Raspberrypi3.
    Qt version is 5.7.1.
    I feel a little silly but I found out what was wrong.
    Basically my touch was rotated of 180 compare to my screen. So when I pressed on QDial, which is in the middle of the screen, it worked while when I pressed a button on the corner the clicked() release() could not be launched. Thank you anyway.

    P.S. I've got another problem with libmodus, opened in another thread, could you look at it :) ?


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