Hey,

> I've seen, that I can change theme on-the-fly,
at the moment, thats not possible. That would contain the font theme as well. ;)

> but how to let user change the font and font size from qooxdoo application 
> window to the whole app?
Most of the widgets use the fonts defined by the font theme. Using the font 
theme manager, you can access the font objects used. Manipulating them will 
change the font size. Unfortunately, that will not invoke a new rendering of 
the widgets. If its ok for you to reload, you could change the font theme 
before the initial rendering which then solves the problem.

> For example,  http://demo.qooxdoo.org/current/demobrowser/#ui~WebFonts.html
> here  I can see, that widget font is changed to the web font, but I need to
> change all widgets. Maybe with page reloading, getting font size as
> additional argument before widgets will be shown.
> 
> I had an idea about signals to all windows in the app, but maybe simpler
> solution exists.
> 
> P.S.: I am using qooxdoo 2.0.1.

Regards,
Martin
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