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.

Unsolved connect in qt using two different classes