In our application, the touch screen is larger than the LCD screen, and touch buttons are set outside the LCD screen, as shown here:

However, Qt can only detect touch events within the LCD screen, and it cannot detect touch events outside of the LCD. We use QTouchEvent to handle the touch.

#include <QApplication>
#include <QWidget>
#include <QDebug>
#include <QTouchEvent>

class TouchWidget : public QWidget {
public:
    TouchWidget(QWidget *parent = nullptr) : QWidget(parent) {
        setWindowTitle("Qt touch detect");
        resize(380, 240);
        setAttribute(Qt::WA_AcceptTouchEvents);
    }

protected:
    bool event(QEvent *event) override {
        if (event->type() == QEvent::TouchBegin ||
            event->type() == QEvent::TouchUpdate ||
            event->type() == QEvent::TouchEnd) {

            QTouchEvent *touchEvent = static_cast<QTouchEvent*>(event);
            for (const QTouchEvent::TouchPoint &point : touchEvent->touchPoints()) {
                qDebug() << "touch point:" << point.pos();
            }
            return true;
        }
        return QWidget::event(event);
    }
};

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);

    QCoreApplication::setAttribute(Qt::AA_SynthesizeTouchForUnhandledMouseEvents);
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    TouchWidget window;
    window.show();

    return app.exec();
}

Is there any way to solve this problem?