#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQuickWindow>

class WindowMover : public QObject
  {
  protected:
    bool eventFilter(QObject *obj, QEvent *event)
    {
        if(event->type() == QEvent::Move)
        {
            QWindow* window = (QWindow*)obj;

            QMoveEvent *ev = (QMoveEvent *)event;
            qDebug() << "eventFilter before" << window->position();

            qDebug() << "eventFilter setto" << ev->oldPos() << ev->pos();
			//I found that, after I setpostion with a negative x, i recieve another moveevent with x = 0, and it may comes from window_manager
            window->setPosition(ev->pos());
            window->lower();

            qDebug() << "eventFilter after" << window->position();

            return true;
        }
        return false;
    }
  };

class MyWindow : public QQuickWindow
{
public:
    MyWindow(QWindow* parent = NULL)
        : QQuickWindow(parent)
        , _hold(NULL)
    {
		//set negative x, but it would'n help
        setGeometry(-50,30,200,200);
    }

    void setControl(QWindow* hold)
    {
        _hold = hold;
    }

      ~MyWindow(){}

protected:

    void mousePressEvent(QMouseEvent *ev)
    {
        if(_hold)
        {
			//set negative x to _hold
            QMoveEvent moveEvent(QPoint(-100,100), _hold->position());
                QCoreApplication::sendEvent(_hold, &moveEvent);
        }
    }

    void moveEvent(QMoveEvent *ev)
    {
        qDebug() << "moveEvent before" << position();
        qDebug() << "moveEvent setto" << ev->oldPos() << ev->pos();
        setPosition(ev->pos());
        qDebug() << "moveEvent after" << position();
    }
private:
QWindow* _hold;
};

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    WindowMover windowMover;

    MyWindow mywindow1;
    mywindow1.setTitle("mywindow1");

    /**
     * set this flag would be help, but I can't accept the top-most window allways overlap other window
    */
    //mywindow1.setFlags(Qt::X11BypassWindowManagerHint);
    mywindow1.installEventFilter(&windowMover);
    mywindow1.show();

    MyWindow mywindow2;
    mywindow2.setTitle("mywindow2");
    /**
     * I want to control the mywindow1's move, but I can't set parent because I want to paint something
     * on the mywindow1 and mywindow2 either, and setparent would be an overlap issue
     */
    mywindow2.setControl(&mywindow1);
    mywindow2.show();

    return app.exec();
}