How to insert a drawing in QWidget in Qt Designer form ?

[giorgik]

I created a dialog in Qt Designer di Qt 6.5 per Windows 10 in which I put a QWidget that will contain a drawing made with QPainter in my application code. What should I write in the paintEvent(QPaintEvent* event) where the drawing is created and that I want to insert in the QWidget of the Qt Designer form ?
To better understand what I'm saying, I attach a screenshot of what I have now: a red led drawn with QPainter in the :aintEvent(QPaintEvent* event) code of my application and a check box inserted by Qt Designer.
Here instead the paintEvent method in which I draw the led:

void Led::paintEvent(QPaintEvent* event)
{
	Q_UNUSED(event);
 
	QPainter p(this);
 
	QRect geo = ui.widgetLed->geometry();
	int width = geo.width();
	int height = geo.height();
 
	int x = 0, y = 0;
	if (alignment_ & Qt::AlignLeft)
		x = 0;
	else if (alignment_ & Qt::AlignRight)
		x = width - diamX_;
	else if (alignment_ & Qt::AlignHCenter)
		x = (width - diamX_) / 2;
	else if (alignment_ & Qt::AlignJustify)
		x = 0;
 
	if (alignment_ & Qt::AlignTop)
		y = 0;
	else if (alignment_ & Qt::AlignBottom)
		y = height - diamY_;
	else if (alignment_ & Qt::AlignVCenter)
		y = (height - diamY_) / 2;
 
	QRadialGradient g(x + diamX_ / 2, y + diamY_ / 2, diamX_ * 0.4,
		diamX_ * 0.4, diamY_ * 0.4);
 
	g.setColorAt(0, Qt::white);
	if (state_)
		g.setColorAt(1, color_);
	else
		g.setColorAt(1, Qt::black);
	QBrush brush(g);
 
	p.setPen(color_);
	p.setRenderHint(QPainter::Antialiasing, true);
	p.setBrush(brush);
	p.drawEllipse(x, y, diamX_ - 1, diamY_ - 1);
 
	if (flashRate_ > 0 && flashing_)
		timer_->start(flashRate_);
	else
		timer_->stop();
}

void Led::paintEvent(QPaintEvent* event)
{
	Q_UNUSED(event);

	QPainter p(this);

	QRect geo = ui.widgetLed->geometry();
	int width = geo.width();
	int height = geo.height();

	int x = 0, y = 0;
	if (alignment_ & Qt::AlignLeft)
		x = 0;
	else if (alignment_ & Qt::AlignRight)
		x = width - diamX_;
	else if (alignment_ & Qt::AlignHCenter)
		x = (width - diamX_) / 2;
	else if (alignment_ & Qt::AlignJustify)
		x = 0;

	if (alignment_ & Qt::AlignTop)
		y = 0;
	else if (alignment_ & Qt::AlignBottom)
		y = height - diamY_;
	else if (alignment_ & Qt::AlignVCenter)
		y = (height - diamY_) / 2;

	QRadialGradient g(x + diamX_ / 2, y + diamY_ / 2, diamX_ * 0.4,
		diamX_ * 0.4, diamY_ * 0.4);

	g.setColorAt(0, Qt::white);
	if (state_)
		g.setColorAt(1, color_);
	else
		g.setColorAt(1, Qt::black);
	QBrush brush(g);

	p.setPen(color_);
	p.setRenderHint(QPainter::Antialiasing, true);
	p.setBrush(brush);
	p.drawEllipse(x, y, diamX_ - 1, diamY_ - 1);

	if (flashRate_ > 0 && flashing_)
		timer_->start(flashRate_);
	else
		timer_->stop();
}

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All this to be able to see the check box and the led side by side and not as in the figure I have attached.