Changing control font size

[Andreas Höschler]

Hi all,

I am building a GNUstep app on Ubuntu 20.04 and would like the font used by NSButtons, NSTableView, NSComboBox etc. to be larger as normal for industrial usage of the app (better readability from further away from the screen).

I found this list 

> NSBoldFontSize
> NSControlContentFontSize
> NSFontSize
> NSLabelFontSize
> NSMenuFontSize
> NSMiniFontSize
> NSMessageFontSize
> NSPaletteFontSize
> NSSmallFontSize
> NSTitleBarFontSize
> NSToolTipsFontSize
> NSUserFixedPitchFontSize
> NSUserFontSize

and greped through the GNUstep sources for NSControlContentFontSize but only found 

grep -r "NSControlContentFontSize" /usr/src/GNUstep/

/usr/src/GNUstep/libs-gui/Source/NSFont.m:    <item>NSControlContentFontSize  (none)</item>

/usr/src/GNUstep/libs-gui/Source/NSToolbarItem.m:  // [NSFont smallSystemFontSize] or better should be NSControlContentFontSize

Is this default used at all? How would I programmatically change the font size for all the controls in the user interface. I intuitively tried 

   [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithFloat:20.0] forKey:NSControlContentFontSize];

   [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithFloat:20.0] forKey:NSLabelFontSize];

but this of course does not build since NSControlContentFontSize is undefined. 

I am obviously missing the point!? :-(

Any idea?

Thanks a lot, 

 Andreas