Qt in other class

[Morea]

I wish to write a totaly simple C++ class. It should contain a pointer to a QMainWidget (or another suitable Qt object) and if a certain bool variable is set to false the pointer should be 0 or else it should point to a qtobject that contains three buttons and a big area where I can draw stuff.

Like this

class Box{
private:
    SomeQtclass*  theQtObject;
    bool use_gui; 
    void drawstuff(){if (use_gui) /*do stuff*/}
    void do_random_thing_not_directly_affecting_the_gui();
};

class Box{
private:
    SomeQtclass*  theQtObject;
    bool use_gui; 
    void drawstuff(){if (use_gui) /*do stuff*/}
    void do_random_thing_not_directly_affecting_the_gui();
};

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In the main application I would then have

int main()
{
   Box mybox;
   cin>>mybox.use_gui;
   while (true){
       mybox.do_random_thing_not_directly_affecting_the_gui();
       mybox.drawstuff();
   }
}

int main()
{
   Box mybox;
   cin>>mybox.use_gui;
   while (true){
       mybox.do_random_thing_not_directly_affecting_the_gui();
       mybox.drawstuff();
   }
}

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The Box class should be a kind of class that could be included in many other programs, like std::string.

How do I write this kind of code? I need some kind of QApplication, right? Where do I put it?
Anyone with idas, please speak up!

[wysota]

But what is exactly your problem? Based on the number of your posts and the forum you post in I take it that you should know where to create a QApplication object...

[Morea]

But the thing is, I don't want to give up the controll to QApplication::exec(). I can't run it and get back to the other code I was running before that? That is the problem.

Don't let the number of questions fool you. It might be a sign of a REAL newbee.

[fullmetalcoder]

But the thing is, I don't want to give up the controll to QApplication::exec(). I can't run it and get back to the other code I was running before that? That is the problem.

Don't let the number of questions fool you. It might be a sign of a REAL newbee.

Just do it!
Basically, the whole QtCore module is accessible (containers and so on) without any need of QApplication::exec() but if you want piece of GUI you'll need to give up the control and rely on the event loop...

[wysota]

If you want to run some code in parallel to operating on a GUI, you might consider running it in a separate thread or as a timeout slot for a QTimer object.