how can i increase font size of QLabel with help of Qwidget::setFont()?

[Yash001]

QWidget* MainWindowUI::GetSoftwareManual() {

	static QWidget *w = 0;

	if (w != 0) {
		return w;
	}

	//w = WDG();
	w = new QWidget();

	QLabel* lal;
	// set the horizontal layout into Software Manual Widge
	QHBoxLayout *lay = NO_SPACING(NO_MARGIN(new QHBoxLayout(w)));
	lay->addWidget(lal= new QLabel("hello"));
	
	
	QFont f = lal->font();
	f.setPixelSize(20);
	f.setPointSize(20);
	f.setBold(true);
	lal->setFont(f);
	
	return w;
}

output:

It make text bold but does not increase font size.

I wanted use Qwidget::setFont and QFont for increasing size of font.

If i will QTimer then it is increase font size correctly, but it is add flick.

QTimer::singleShot(1, [=]() {
   	lal->setFont(f);
   });

what is right way to use increasing size of QLabel text ?

[Kent-Dorfman]

so what happens when you go the other direction and shrink the text?

[Pl45m4]

@Yash001

Why you set Point AND Pixelsize to 20?
They both do nearly the same. Try it without the "setPixel", as setPoint is device independent.

[Yash001]

@Pl45m4
I already tried separately and together both, but none of them work.

[Yash001]

@Kent-Dorfman said in how can i increase font size of QLabel with help of Qwidget::setFont()?:

when you go the other direction

do you mean change alignment? Left to Right?

[Kent-Dorfman]

no, decrese the font size and see if it works. then you'll know whether you can change font size at all. If it works then that should be a hint as to why you cannot increase the size.