Help with QStackedWidget

[onírico]

Hi everyone!!
I'm having some problems with a QStackedWidget and I though maybe you can help me. The program is a QWidget which contains a QStackedWidget and two QPushButtons (one, to change page; and another, to quit). The problem is that the "Change" button doesn't work and I have no idea why...
Here's the relevant code...

MenuManager::MenuManager(QWidget *parent): QWidget(parent)
{
    menus = new QStackedWidget;
    menus->addWidget( m1 = new MenuOne  );
    menus->addWidget( m2 = new MenuTwo  );
    menus->addWidget( m3 = new MenuThree);
    menus->addWidget( m4 = new MenuFour  );
    menus->addWidget( m5 = new MenuFive  );
 
    /*menus->setCurrentIndex(3);*/ // Works fine, which means Menus' code is allright
 
    QPushButton *bChange = new QPushButton("Change");
    QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(3)));
 
    QPushButton *bQuit = new QPushButton("Quit");
    QObject::connect(bQuit, SIGNAL(clicked()), this, SLOT(close()));
 
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(menus);
    layout->addWidget(bChange);
    layout->addWidget(bQuit);
    setLayout(layout);
}

MenuManager::MenuManager(QWidget *parent): QWidget(parent)
{
    menus = new QStackedWidget;
    menus->addWidget( m1 = new MenuOne  );
    menus->addWidget( m2 = new MenuTwo  );
    menus->addWidget( m3 = new MenuThree);
    menus->addWidget( m4 = new MenuFour  );
    menus->addWidget( m5 = new MenuFive  );

    /*menus->setCurrentIndex(3);*/ // Works fine, which means Menus' code is allright

    QPushButton *bChange = new QPushButton("Change");
    QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(3)));

    QPushButton *bQuit = new QPushButton("Quit");
    QObject::connect(bQuit, SIGNAL(clicked()), this, SLOT(close()));

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(menus);
    layout->addWidget(bChange);
    layout->addWidget(bQuit);
    setLayout(layout);
}

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Any help will be apreciated. Thanks!

[spirit]

this connection is wrong

QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(3)));//3 -- wrong

QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(3)));//3 -- wrong

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.
read carefully about signal&slots

[onírico]

Thank for spending your time reading my code, spirit.
I´ve read about signals and spots but I still haven't found the point. Could you give more clues?? I supose I have to define a slot function to change the page. I´m not sure how.

[spirit]

you is not careful.
your connection is

QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(3)));

QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(3)));

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it's not correct, because passing real values in connection IS NOT allowed.
so, your connection must look like

QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(int)));

QObject::connect(bChange, SIGNAL(clicked()), menus, SLOT(setCurrentIndex(int)));

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i.e. you should specify SIGNATURE of method.

[onírico]

Ok. But now, how do I link that button with the MenuThree?? Do I have to use QSignalMapper??
what is exactly the signature (of a signal or slot)???

Thank you again, spirit!! And sorry for being worse than a headache.

[spirit]

add a slot which changes pages:

....
 QObject::connect(bChange, SIGNAL(clicked()), this, SLOT(changePage()));
....
void MyWidget::changePage()
{
   int nextPage = menus->currentIndex() + 1;
   if (nextPage >= menus->count())
      nextPage = 0;
   menus->setCurrentIndex(nextPage);
}
...

....
 QObject::connect(bChange, SIGNAL(clicked()), this, SLOT(changePage()));
....
void MyWidget::changePage()
{
   int nextPage = menus->currentIndex() + 1;
   if (nextPage >= menus->count())
      nextPage = 0;
   menus->setCurrentIndex(nextPage);
}
...

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should be something like this.

[onírico]

That wasn´t exactly what I wanted. But it helped me a lot to solve my problem.

Thank so much, spirit!!!