[PARTIALLY SOLVED] Error drawing?

[QNewbie]

EDIT: For anyone getting this kind of error, override the paintEvent(QPaintEvent*) method..
EDIT 2: The painting is happening as many times as something is drawn in the screen, aint there a way for this to happen only once without adding some bool in there?
Hey all, I've got a project going where I'm trying to learn about clipping regions and painting.
However, I'm stuck.
The code presented below shows the clipped widget. Now, when I try to paint a red line on the borders of the clipped widget, it will, no error thrown, not even try to paint, or am I missing something?

Cargador::Cargador(QWidget *parent) : QWidget(parent,Qt::FramelessWindowHint), ui(new Ui::Cargador) {
    ui->setupUi(this);
    resize(500,255);
    QRegion esquina;
    QRegion circulo;
    QRegion region(0,0,width(),height(),QRegion::Rectangle);
    // SUPERIOR IZQUIERDO
    circulo = QRegion(0,0,50,50,QRegion::Ellipse); // Circulo hardcodeado
    esquina = QRegion(0,0,25,25,QRegion::Rectangle); // Cuadrado de un cuarto del circulo
    region = region.subtracted(esquina.subtracted(circulo));
    // INFERIOR DERECHO
    circulo = QRegion(width()-50,height()-50,50,50,QRegion::Ellipse);
    esquina = QRegion(width()-25,height()-25,25,25,QRegion::Rectangle);
    region = region.subtracted(esquina.subtracted(circulo));
    setMask(region);
    QPixmap logo(":/Cargador/Imagenes/Logo.png",0,Qt::AutoColor);
    // qDebug() << logo;
    ui->lblLogo->setPixmap(logo);
    ui->lblLogo->show();
    // Labels transparentes
    ui->label->setAttribute(Qt::WA_TranslucentBackground);
    ui->label_2->setAttribute(Qt::WA_TranslucentBackground);
    ui->lblCargando->setAttribute(Qt::WA_TranslucentBackground);
    ui->lblLogo->setAttribute(Qt::WA_TranslucentBackground);
    // Borde en negro.
    QPainter decorador(this);
    //QPolygon poligono;
    QPen linea;
    QPainterPath zona;
    zona.addRegion(region);
    linea.setWidth(8);
    linea.setColor(Qt::red);
    decorador.setPen(linea);
 
    decorador.drawPath(zona);
 
 
 
}

Cargador::Cargador(QWidget *parent) : QWidget(parent,Qt::FramelessWindowHint), ui(new Ui::Cargador) {
    ui->setupUi(this);
    resize(500,255);
    QRegion esquina;
    QRegion circulo;
    QRegion region(0,0,width(),height(),QRegion::Rectangle);
    // SUPERIOR IZQUIERDO
    circulo = QRegion(0,0,50,50,QRegion::Ellipse); // Circulo hardcodeado
    esquina = QRegion(0,0,25,25,QRegion::Rectangle); // Cuadrado de un cuarto del circulo
    region = region.subtracted(esquina.subtracted(circulo));
    // INFERIOR DERECHO
    circulo = QRegion(width()-50,height()-50,50,50,QRegion::Ellipse);
    esquina = QRegion(width()-25,height()-25,25,25,QRegion::Rectangle);
    region = region.subtracted(esquina.subtracted(circulo));
    setMask(region);
    QPixmap logo(":/Cargador/Imagenes/Logo.png",0,Qt::AutoColor);
    // qDebug() << logo;
    ui->lblLogo->setPixmap(logo);
    ui->lblLogo->show();
    // Labels transparentes
    ui->label->setAttribute(Qt::WA_TranslucentBackground);
    ui->label_2->setAttribute(Qt::WA_TranslucentBackground);
    ui->lblCargando->setAttribute(Qt::WA_TranslucentBackground);
    ui->lblLogo->setAttribute(Qt::WA_TranslucentBackground);
    // Borde en negro.
    QPainter decorador(this);
    //QPolygon poligono;
    QPen linea;
    QPainterPath zona;
    zona.addRegion(region);
    linea.setWidth(8);
    linea.setColor(Qt::red);
    decorador.setPen(linea);

    decorador.drawPath(zona);



}

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