event in the paint of the drawEllipse

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Hello
I created a Node.
I want to deal with the event.
as If the user presses on one of the Node
then, Out a message Or change the color of the Node.

in Node.cpp

void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
{
 
    QRadialGradient gradient(-3, -3, 10);
    if (option->state & QStyle::State_Sunken) {
        gradient.setCenter(4, 4);
        gradient.setFocalPoint(4, 4);
        gradient.setColorAt(0, Qt::darkBlue);
    } else {
 gradient.setColorAt(0, Qt::darkBlue);
    }
    painter->setBrush(gradient);
    painter->setPen(QPen(Qt::darkBlue, 0));
    painter->drawEllipse(-10, -10, 20, 20);
}

void Node::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
{

    QRadialGradient gradient(-3, -3, 10);
    if (option->state & QStyle::State_Sunken) {
        gradient.setCenter(4, 4);
        gradient.setFocalPoint(4, 4);
        gradient.setColorAt(0, Qt::darkBlue);
    } else {
 gradient.setColorAt(0, Qt::darkBlue);
    }
    painter->setBrush(gradient);
    painter->setPen(QPen(Qt::darkBlue, 0));
    painter->drawEllipse(-10, -10, 20, 20);
}

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in MainWindow.cpp

Node *node1 = new Node(this);

Node *node1 = new Node(this);

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