[Qt-interest] signal and slot

[Malyushytsky, Alex]

Please answer to the mailing list, not to me directly.

That what exactly what I meant when I asked you do make sure your questions can be  understood.
I either fail to understand your problem, or you fail to understand the suggestion.

Assume you have QAction signal triggered which is emitted when user activates menu command.

You have instances of 2 classes:

class A
{
................
signals:
  void slotB_isReadyToBeCalled();

public slots:
   void   onActionTriggered() {
   // do something
  ...
  // call B::onActionTriggered() one way or another

#ifdef CALL_B_DIRECTLY
     getB_pointer()->B::onActionTriggered();
#else
    emit slotB_isReadyToBeCalled();
#endif
  };
}


class B
{
................
public slots:
   void   onActionTriggered();
}

// somewhere in  cpp

  QObject* a =  new A();
  QObject* b =  new B();

...
  bool ok
 ok = connect( ui.myAction, SIGNAL( triggered()), a, SLOT(onActionTriggered ()) );  Q_ASSERT( ok );

#if ! defined CALL_B_DIRECTLY

 ok = connect( b, SIGNAL(slotB_isReadyToBeCalled ()), b, SLOT(onActionTriggered ()) );  Q_ASSERT( ok );

#endif


// if signal triggered you get both 'a' and 'b' slots onActionTriggered() called and a is called first

Regards,
   Alex




From: yanqzhi at gmail.com [mailto:yanqzhi at gmail.com]
Sent: Monday, March 01, 2010 6:40 PM
To: Malyushytsky, Alex
Subject: Re: [Qt-interest] signal and slot

Dear Malyushytsky, Alex,

Yes, I mean that in your email.

But the other function will call the first slot and in this case the second slot will not be called.

Thanks a lot.


Sincerely

yanqzhi at gmail.com
2010-03-02



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