How to use separate threads for pushbuttons in QT (like SwingWorker in Java)

[anda_skoa]

What do "someslot" should look like? I defined the Filewalker::walk() (as a function for indexation) as public slot in Filewalker.h - is it not enough??

Yes, that is enough.

And I think that all slots like walk(), writetoxmlfile() and qlist <filewalker*> should be put in Lister

That would be ok as well.

as class with default constructor

Type of constructor doesn't matter at all, no difference to Java.

(is it possible in such way to use class Lister: public QObject) and Filewalker as class just with fields. So I would put &f as the reference to Lister object.

Sure, why not.

undefined reference to `vtable

Make sure that the header for Lister is in the HEADERS variable in your .pro file and re-run qmake.

Cheers,
_