QT Moving entire window/application by clicking on the menubar c++ - c++

Question

I want to get rid of the my application's title and border, but to do that I need to be able to move the window by dragging on the menuBar. The two method's I've found to do this is:
void TopMenuBar::mousePressEvent(QMouseEvent *event)
{
if (event->button() == Qt::LeftButton) {
dragPosition = event->globalPos() - frameGeometry().topLeft();
event->accept();
}
}
void TopMenuBar::mouseMoveEvent(QMouseEvent *event)
{
if (event->buttons() & Qt::LeftButton) {
move(event->globalPos() - dragPosition);
event->accept();
}
}
However if I put this in the MainWindow, it will move around no matter what you click on, and if I put it in a custom QMenuBar, it only moves the menubar within the window. I've also attempted to do some signals and slots trickery between the objects (Like keeping mousePressEvent in menuBar and mouseMoveEvent in MainWindow), but the tendency is that the window will "jump" to where the mouse pointer is instead of moving it smoothly.
Anyone else have a solution for this?
Environment is Windows

Answer 1

This will work for certain - just checked it. Call ui->menuBar->installEventFilter(this); in the MainWindow constructor.
bool MainWindow::eventFilter(QObject *watched, QEvent *event)
{
if (watched == ui->menuBar)
{
if (event->type() == QEvent::MouseButtonPress)
{
QMouseEvent* mouse_event = dynamic_cast<QMouseEvent*>(event);
if (mouse_event->button() == Qt::LeftButton)
{
dragPosition = mouse_event->globalPos() - frameGeometry().topLeft();
return false;
}
}
else if (event->type() == QEvent::MouseMove)
{
QMouseEvent* mouse_event = dynamic_cast<QMouseEvent*>(event);
if (mouse_event->buttons() & Qt::LeftButton)
{
move(mouse_event->globalPos() - dragPosition);
return false;
}
}
}
return false;
}