[Qt-interest] Derive slots from non-Qt-based classes

[Ian Thomson]

Hi,

Please send replies to the list.

In the example code you posted, the Q_OBJECT macro is missing.

I think you should separate your display code and your processing code. 
It sounds like it would be much easier if they were in different 
hierarchies. Qt offers the signal/slot mechanism which makes this very 
easy to do.

Cheers,
Ian.

Stefan Bisplinghoff wrote:
> Ian Thomson schrieb:
>> 1) You are missing the Q_OBJECT macro
> 
> Q_OBJECT macro is only valid in QObject based classes.
> 
>> 2) Is there a good reason you don't make the base class a QWidget?
> 
> Yes, as stated before, my SomeDerivedClass inherits from SomeBaseClass
> *and* a QtClass. This could be a QWidget, but also a QGLWidget, so
> deriving SomeBaseClass from QWidget doesn't make much sense as the
> OpenGL functionality could not be integrated in that case.
> 
> The key problem is that multiple inheritance of Qt-based classes is not
> allowed.
> 
>> 3) Even better, why not make the base class a QObject which emits 
>> signals which you can connect up to widgets to display the information.
> 
> see above...
> 
> Kind regards,
>  Stefan
>