QVirtualKeyboard on widget-based application on Raspberry pi3

Foufy

Hi,
I'm trying to understand why the VirtualKeyboard is not working on raspberry pi 3 (running with boot2qt Qt5.12.0) using a widget-based application BUT working with the Qt Quick Virtual Keyboard - Basic Example .
Is there a difference between QML and Widget plugin?

In my widget-based application I've the following (work if I compile it on my PC with gcc-64bits)

in .pro file I just add

QT       += core gui virtualkeyboard
CONFIG += disable-desktop

in main.cpp

int main(int argc, char *argv[])
{
    qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));

    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

in mainwindow.cpp

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QLineEdit *mLineEdit = new QLineEdit(this);
    setCentralWidget(mLineEdit);
}

SGaist

Hi,

Did you try to run your application with the QT_DEBUG_PLUGINS environment set to 1 ? That should give you some additional clues about what is happening.

Foufy

Hi SGaist,
Thank you I've try the QT_DEBUG_PLUGIN but the virtual keyboard one seems to be properly loaded.
I found a similar post : https://forum.qt.io/topic/75129/virtual-keyboard-does-not-show-up-in-qwidgets-app-on-rpi-2
The conclusion is that QVirtualKeyboard doesn't work with EGLFS. It is necessary to add QML part. Very bad! I never used QML

Foufy

Can somebody give me a quick example of QML using QQuickWidget?

Thank you

jsulm

@Foufy Google can: https://doc.qt.io/qt-5/qtquick-quickwidgets-quickwidget-example.html