[Interest] scale all fonts

[Bo Thorsen]

Den 19-03-2013 11:27, Hamish Moffatt skrev:
> Is it possible to apply a scaling to all font sizes used in an application?
>
> I can see Qt is doing the right thing by converting point sizes to pixel
> sizes in accordance with the DPI of the display. Now suppose I want to
> override the DPI, or redefine point to be other than 1/72" (achieves the
> same). Is this possible?

Well, yes and no. You can't say a widget uses "standard pixel size plus X".

You can set a standard font on QApplication with the size you want:

QFont font;
font.setPixelSize(23);
QApplication::setFont(font);

That part is easy enough.

But in places where you have custom drawing with other sizes, you need 
to do the same kind of thing:

QFont f; // This is the standard font
f.setPixelSize(f.pixelSize() + 3);
setFont(f); // Or use f with the painter

You can listen for font changes with the changeEvent() in widgets. If 
you use the QWidget::setFont(), this is necessary. If you just use it in 
the painter, it's not necessary.

In all text based widgets with rich text, you can use <font size="+3"> 
and then it just works.

With style sheets, you can't do this.

In QML you can do sort of the same things. But I assumed this was a 
QWidget based question.

Bo.

-- 
Bo Thorsen, European Qt Manager, Integrated Computer Solutions
ICS - Delivering World-Class Applications for Embedded & Mobile Devices
http://ics.com/services