slot "return" close my GUI app

[Joelito]

Hi, I have a slot for qpushbutton:


connect(button1, SIGNAL(clicked()), this, SLOT(handleButtonClicked()));
/* more code */
protected slots:
void handleButtonClicked()
{
qDebug() << "Clicked handler";
/* test if you want to continue the event */
int ret = QMessageBox::question(...);
if (ret != QMessageBox::Yes) {
return; // cancel the propagation?
}
qDebug() << "Glad that you join us";
}

my problem is that when I hit "No", the window closes :(
any ideas?

[anda_skoa]

my problem is that when I hit "No", the window closes :(

Which has nothing to do with your code.



any ideas?

No. Not enough information to even guess.

Cheers,
_

[Joelito]

When I hit button in my app (buttton1) there's a QMessageBox with yes and no buttons...if the user hits "no" button in the QMessageBox, the GUI closes. So the expected situation is that after the "no" button the function returns or exits without displaying Glad that you join us

[ChrisW67]

That is not happening in the code you are showing us. Run your program in your debugger and single step through this slot to find out where it actually "closes", whether that is an abnormal or normal termination, and the actual trigger for it.

[sulliwk06]

why dont you use a switch statement on the return from the dialog and catch the no response, then try to do something other than return? maybe add a breakpoint and debug it.

[Joelito]

The debugger is clean:


[New Thread 0xac796b40 (LWP 1368)]
[Thread 0xac796b40 (LWP 1368) exited]
[Inferior 1 (process 1362) exited normally]
(gdb) where
No stack.
(gdb)

[ChrisW67]

And where did it exit from after the slot call returned?

[Joelito]

I think I know the problem:

1.- If the GUI is visible the QMessageBox responds as expected and the function returns if I click and the "No" button; the GUI stills active.
2.- But if the GUI is hidden ans I display the QMessageBox, the GUI closes after I click "No".

:-/

[anda_skoa]

Does it help if you set http://qt-project.org/doc/qt-4.8/qapplication.html#quitOnLastWindowClosed-prop to false?

Cheers,
_

[Joelito]

Thanks for the tip, @anda_skoa. It did help and also I think QMessageBox needs a valid parent pointer to avoid the application exits.