[Solved]Access to QPushButton who are created in a loop

[starFire]

Hello
When I create a QPushBotton in the constructor of my window in a for loop and want to show a label if there is clicked, how can I do this?
I mean it like this:
@
for (int i {0}; i != 10; ++i)
{
QPushButton *button = new QPushButton;
QLabel *label = new QLabel;
label->hide();
// when button is clicked i want to show the label
}
@

This is a very simplified version of my code.
In my code I have a vector with a class type that includes things like name and so on.
And I create in the loop Layouts that I add to a Scroll Area Widget.
thanks

[dheerendra]

Try adding this statement.
connect(button,SIGNAL(clicked(),label,slot(show()));

Please not with above example, same pointer variable is continously used.

[starFire]

thanks for your response.
When I make it so the widgets show when the button is clicked.
But now I want that the widgets hide when I click again.

[dheerendra]

Please look at how the show and hide works. You need to put your own logic make this kind of behaviour you are asking.

[MuldeR]

[quote author="starFire" date="1406400950"]thanks for your response.
When I make it so the widgets show when the button is clicked.
But now I want that the widgets hide when I click again.[/quote]

I think you'll need a custom slot for that:

@//This is a helper class
class ButtonUserData : public QObjectUserData
{
public:
ButtonUserData(QLabel *label)
{
m_label = label;
}

QLabel *getLabel(void)
{
return m_label;
}

private:
QLabel *m_label;
};@

@//Setup function
MyClass::someFunction(void)
{
for (int i = 0; i < 10; ++i)
{
QPushButton *button = new QPushButton(this);
QLabel *label = new QLabel(this);
button->setUserData(42, new ButtonUserData(button));
connect(button, SIGNAL(clicked()), this SLOT(buttonWasClicked()));
label->hide();
}
}

//Slot function
MyClass::buttonWasClicked(void)
{
//Get specific button that was clicked:
QPushButton button = dynamic_cast<QPushButton>(QObject::sender());
if(button)
{
//Get the corresponding QLabel:
ButtonUserData data = dynamic_cast<ButtonUserData>(button->userData(42));
if(data)
{
//Toggle label visibility:
QLabel *label= data->getLabel();
label->setVisible(!(label->isVisible()));
}
}
}@

[starFire]

Yes you are right, what I need was a inherated class and my own SLOT.
Thank you !

[Chris Kawa]

Or you could just use a lambda:
@
for (int i {0}; i != 10; ++i)
{
//you should give a parent to these widgets or they'll leak
QPushButton *button = new QPushButton;
QLabel *label = new QLabel;
label->hide();

connect(button, &QPushButton::clicked, ={
label->setVisible(!label->isVisible());
});
}
@

[MuldeR]

[quote author="Chris Kawa" date="1406481750"]Or you could just use a lambda:
@
for (int i {0}; i != 10; ++i)
{
//you should give a parent to these widgets or they'll leak
QPushButton *button = new QPushButton;
QLabel *label = new QLabel;
label->hide();

connect(button, &QPushButton::clicked, ={
label->setVisible(!label->isVisible());
});
}
@[/quote]

Nifty!

[starFire]

[quote author="Chris Kawa" date="1406481750"]Or you could just use a lambda:
@
for (int i {0}; i != 10; ++i)
{
//you should give a parent to these widgets or they'll leak
QPushButton *button = new QPushButton;
QLabel *label = new QLabel;
label->hide();

connect(button, &QPushButton::clicked, ={
label->setVisible(!label->isVisible());
});
}
@

[/quote]

Can I use a lambda by using this form, too?

@
connect(PushButton, SIGNAL(The signal), label, SLOT(The Slot))
@
When I make it like this the compiler says "No such slot".
EDIT:
Ok I have to do it with the new Syntax.