[Interest] QIcon and multiple themes

[Stefan Böhmann]

Hi list,

I want to provide a custom set of icons for my application without using resources (license and size constraints). So all icons are installed together with the application. I also have not only one single theme but a generic one (Oxygen for example), some specific (e.g. flags) and an application-specific. 

So my installation directory looks like this:

icons
    oxygen
        16x16
        …
        index.theme
    flags
        16x16
        …
        index.theme
    app
        16x16
        …
        index.theme


How can I load the icons easiest?
I know QIcon :: setTheme and friends, but do not see how I can apply it with multiple themes. Or should I write my own QIconEnginePlugin?

BTW: Ease of use is more important than ease of implementation. 

Any tip is appreciated.

Thanks,
Stefan