connect in qt using two different classes

jaouad100

I want to connect a signal and a slot from two different classes in which one is using the other like this example:

form.hpp

class Form : public QDialog
{
    Q_OBJECT

public:
    explicit Form();
public slots:
     void onPushButton(void);    

};

form.cpp

Form::Form() :
    QDialog(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);
    connect(..., SIGNAL(clicked()),..., SLOT(onPushButton()));

}

void Form::onPushButton(void)
{
    ui->pushButton->setText(QString("clicked"));
}

mainwindow.hpp

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    
private:
    Ui::MainWindow *ui;
    Form f;
};

mainwindow.cpp

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

I know it easy to solve but I don't know how to do it. What the syntax of connect in Form::Form()?
If it was the way around I would do it like that:

connect(&f, SIGNAL(clicked()),this, SLOT(onPushButton()));

koahnig

@jaouad100

You would make life a bit easier when you are introducing a bool in the parameter list of onPushButton.

form.hpp

class Form : public QDialog
{
    Q_OBJECT

public:
    explicit Form();
public slots:
     void onPushButton(bool);    

};

form.cpp

Form::Form() :
    QDialog(parent),
    ui(new Ui::Form)
{
    ui->setupUi(this);
    connect(ui->PushButton, SIGNAL(clicked( bool ) ), this, SLOT(onPushButton ( bool )));  // assumes name of QPushButton is PushButton
  // connect(ui->PushButton, &QPushButton::clicked, this, &Form::onPushButton );
}

The alternative connect requires exact the same parameter lists. It give you already a compile error.

The first version would allow to have different parameter lists, but for starting it ios easier to understand when you keep them the same.