QGraphicsScene in paintEvent ?

[PLan2010]

I can create and display a graphics scene, in main(), like this -

QGraphicsScene scene(0, 0, WIDTH, HEIGHT);
 
Button *button;
Button *button2;
 
QPixmap bg("/../mypix.png");
scene.addPixmap(bg);
 
button = new Button();
button2 = new Button();
 
scene.addItem(button);
scene.addItem(button2);
 
QGraphicsView view;
view.setScene(&scene);
view.show();

QGraphicsScene scene(0, 0, WIDTH, HEIGHT);

Button *button;
Button *button2;

QPixmap bg("/../mypix.png");
scene.addPixmap(bg);

button = new Button();
button2 = new Button();

scene.addItem(button);
scene.addItem(button2);

QGraphicsView view;
view.setScene(&scene);
view.show();

To copy to clipboard, switch view to plain text mode 

How would I alter the code to put it in a paintEvent function ? Thanks in advance.