QFontDatabase/QFont question

[John Sturtz]

------ Original Message ------
>From "Charles" <peacech at gmail.com>
To "John Sturtz" <john at sturtz.org>
Cc "Maurizio Berti" <maurizio.berti at gmail.com>; 
pyqt at riverbankcomputing.com
Date 1/9/2025 10:55:57 PM
Subject Re: Re[2]: QFontDatabase/QFont question

> > you're getting a named style from the variable font file
>
>You didn't mention that you are using the variable font. I didn't use 
>the variable font instead I use the static fonts. I also got the thin 
>oblique font with the variable fonts.
I thought the font was inherently variable?  Or is it a matter of how 
you access it?  Use QFontDatabase() (accessing by style name), and you 
are using it as a variable font; use QFont + .setWeight() and 
.setItalic() methods, and you are using it as static (= 'simulated' = 
'synthesized').  Do I understand that correctly?

>
>These codes works for me:
>
>1. f = QFont('Exo', 24, 700, True) # use QFont specifying weight and 
>italic
>2. f = QFont('Exo', 24); f.setWeight(700); f.setItalic(True)
>3. f = QFontDatabase('Exo', 'Bold', 24); f.setStyleName('Bold Italic')
Yes, these all work for me as well [the last needs to be 
QFontDatabase.font('Exo', 'Bold', 24)]

>Note that italic is part of the style name. If you call setItalic(True) 
>there is a mismatch between the style flags and the style name. So if 
>you use QFontDatabase and style name always use setStyleName to change 
>the style, otherwise use QFont and setWeight and setItalic.
So it seems the moral is not to intermingle QFont (static) and 
QFontDatabase (variable) methods.

But this case still troubles me:

I see the problem with other fonts as well -- Bahnschrift, for example, 
which comes with Windows.  If I create a QFont object with 
QFontDatabase.font():

         f = QFontDatabase.font('Bahnschrift', 'Condensed', 24)

and then apply .setItalic(True) to it, it's italic, but no longer 
Condensed.

And actually, the same thing happens if I create the font with QFont() 
directly:

         f = QFont(
             'Bahnschrift Condensed',
             pointSize=24
         )

Here also, the font is fine initially, but after .setItalic(True) it is 
no longer Condensed.

QFontDatabase offers no italic style for Bahnschrift Condensed.  If I 
create with QFont(), it is initially condensed.  But if I call 
.setItalic(True), it no longer is condensed; it's just plain 
Bahnschrift.

I'd think this must be a bug?

/John
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