startSystemMove() and FramelessWindowHint on a QWidget: Can't trigger Windows Features like aerosnap

[KKiranbay]

Hello everyone,

I am using Qt 5.15.8 and I have a problem with startSystemMove():

I have a container class named WindowContainerWidget that inherits QWidget. It displays a custom title bar and shown a custom widget inside itself. I made this class so that I can have a custom title bar that is same on my app's windows.

Its constructor:

WindowContainerWidget::WindowContainerWidget(WindowContainerWidgetSetPropertiesData data, QWidget *parent) :

                QWidget(parent)

{

                Qt::WindowFlags flags = this->windowFlags();

 

                flags |= Qt::FramelessWindowHint;

                flags |= Qt::WindowStaysOnTopHint;

 

                this->setWindowFlags(flags);

 

                this->setAttribute(Qt::WA_NoSystemBackground);

                this->setAttribute(Qt::WA_TranslucentBackground);

 

                properties = data;

 

                setMainLayout();

 

                this->installEventFilter(this);

}

I get title of the window and the widget to be displayed inside the container using my WindowContainerWidgetSetPropertiesData.

I have implemented my eventFilter like this:

bool hvlsim::scenariouserinterface::WindowContainerWidget::eventFilter(QObject *obj, QEvent *event)

{

                switch (event->type())

                {

                                case QEvent::MouseButtonPress:

                                {

                                                QPoint pos = static_cast<QMouseEvent *>(event)->pos();

                                                Qt::Edges edges;

                                                if (isResize(pos, edges))

                                                {

                                                                systemResize(edges);

                                                }

                                                else

                                                {

                                                                systemMove(pos);

                                                }

                                                return true;

                                }

       }

    

       return obj->event(event);

}

And my systemMove():

systemMove(const QPointF &p)

{

                if (p.x() > border && (p.x() < width() - border) &&

                                p.y() > border && p.y() < titleBar->height())

                {

                                this->windowHandle()->startSystemMove();

                }

}

I can't figure out why this doesn't trigger aerosnap features of Windows 10. Can anyone give me some insight? Thanks :)