How to pass variables to slot methods in QT?

Question

I\'m making a little chat messenger program, which needs a list of chat channels the user has joined. To represent this list graphically, I have made a list of QPushButton

Answer 1

For strings and integers, you can use QSignalMapper. In your Messenger class, you would add a QSignalMapper mapper object, and your function would look like:

void Messenger::addToActivePanels(std::string& channel)
{
    activePanelsContents = this->findChild(QString("activePanelsContents"));
    pushButton = new QPushButton(activePanelsContents);
    // ...
    connect(pushButton, SIGNAL(clicked()), &mapper, SLOT(map()));
    mapper.setMapping(pushButton, QString(channel.c_str()));
}

and after you have added all channels to your active panels, you call

connect(&mapper, SIGNAL(mapped(const QString &)), this, SLOT(switchTab(const QString &)));