Except at the last thing I should do , which is saving the picture just to check if it's working and I got a weird problem ,

when I drag the mouse from the top left it works fine..

but when I drag from anywhere like top right it gives me a wrong picture " wrong place or coordinates "

first the code that sets the background of my dialog:
@
this->setWindowFlags(Qt::FramelessWindowHint|Qt::WindowStaysOnTopHint);
this->setWindowState(Qt::WindowFullScreen);
Image=new QPixmap;
screen=QGuiApplication::primaryScreen();
*Image=screen->grabWindow(0);
pal.setBrush(this->backgroundRole(),QBrush(*Image));
this->setPalette(pal);
@
second the mouse events:
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void FramelessWindow::mousePressEvent(QMouseEvent *event){
if(event->button()==Qt::LeftButton){
origin= event->pos();
rubberBand->setGeometry(QRect(origin,QSize()));
rubberBand->show();

    }
}

void FramelessWindow::mouseMoveEvent(QMouseEvent *event){
    rubberBand->setGeometry(QRect(origin,event->pos()).normalized());

   /*
    QRect Rectangle(origin,event->pos());
    QPixmap image=QPixmap::grabWidget(this,Rectangle);



    image.save("TEST.png","png"); // same problem here and in mousereleaseevent
*/


}

@
the release event:
@
void FramelessWindow::mouseReleaseEvent(QMouseEvent *event){

    rubberBand->hide();
    QRect Rectangle(origin,event->pos());
    QPixmap image=QPixmap::grabWidget(this,Rectangle);
    image.save("TEST.png","png");
close();


}

@

Only when I drag from top left to down right it works.