Run QtVirtualKeyboard using QQuickWidget - c++

Question

I am trying to make the QtVirtualKeyboard example work with QQuickWidget instead of QQuickView. For QuickView, I use the following main.cpp code, which works fine for me:
#include <QQuickView>
#include <QGuiApplication>
#include <QQmlEngine>
int main(int argc, char *argv[])
{
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
QGuiApplication app(argc, argv);
QQuickView view(QString("qrc:/%2").arg(MAIN_QML));
view.setResizeMode(QQuickView::SizeRootObjectToView);
view.show();
return app.exec();
}
I run into problems, when changing to QQuickWidgets with the following implementation of main.cpp:
#include <QQuickWidget>
#include <QApplication>
#include <QQmlEngine>
int main(int argc, char *argv[])
{
qputenv("QT_IM_MODULE", QByteArray("qtvirtualkeyboard"));
QApplication app(argc, argv);
QQuickWidget w(QString("qrc:/%2").arg(MAIN_QML));
w.setResizeMode(QQuickWidget::SizeRootObjectToView);
w.show();
return app.exec();
}
When I hit the input fields, the virtual keyboard shows up, but when I start typing at the keyboard, I get the message "input method is not set", which seems to be related to the input method plugin. No chars appear in the input fields.
Any ideas? The QML-code didn't change between the above variants of main.cpp
BTW: I am using Linux, gcc, Qt 5.9.0, EGLFS plugin
Thanks for any suggestions!
Regards,
Patrick

Answer 1

Found the solution for QML looking through inputMethod documentation. Following workaround works for me:
TextArea {
...
onActiveFocusChanged: {
if(activeFocus) {
Qt.inputMethod.update(Qt.ImQueryInput)
}
}
}
Works with other controls as well.
Of course InputPanel should be defined in ApplicationWindow like this:
ApplicationWindow {
...
InputPanel {
id: inputPanel
...
}
}