Prevent QGraphicsItem from moving outside of QGraphicsScene

Question

I have a scene which has fixed dimensions from (0;0) to (481;270):

scene->setSceneRect(0, 0, 481, 270);

Inside of it, I have a custom

Answer 1

This code keeps your complete item in scene. Not only the upper left pixel of your item.

void YourItem::mouseMoveEvent( QGraphicsSceneMouseEvent *event )
{
    QGraphicsItem::mouseMoveEvent(event); 

    if (x() < 0)
    {
        setPos(0, y());
    }
    else if (x() + boundingRect().right() > scene()->width())
    {
        setPos(scene()->width() - boundingRect().width(), y());
    }

    if (y() < 0)
    {
        setPos(x(), 0);
    }
    else if ( y()+ boundingRect().bottom() > scene()->height())
    {
        setPos(x(), scene()->height() - boundingRect().height());
    }
}