connect between function of two differents QWidget

[tbscope]

Try using slots:

class classA : public QWidget
{
    Q_OBJECT
 
public:
   classA(QWidget *parent = 0);
    ~classA();
 
private:
    Ui::board *ui;   
    classB *b;
};
 
classA::classA(...) : QWidget(...)
{
    b = new classB(this);
 
    connect(ui->button, SIGNAL(clicked()), b, SLOT(f()));
}

class classA : public QWidget
{
    Q_OBJECT

public:
   classA(QWidget *parent = 0);
    ~classA();

private:
    Ui::board *ui;   
    classB *b;
};

classA::classA(...) : QWidget(...)
{
    b = new classB(this);

    connect(ui->button, SIGNAL(clicked()), b, SLOT(f()));
}

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class classB: public QWidget
{
    Q_OBJECT
 
public:
   classB(QWidget *parent = 0);
    ~classB();
 
public slots:
   void f();
};

class classB: public QWidget
{
    Q_OBJECT

public:
   classB(QWidget *parent = 0);
    ~classB();

public slots:
   void f();
};

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[shenakan]

Try using slots:

class classA : public QWidget
{
    Q_OBJECT
 
public:
   classA(QWidget *parent = 0);
    ~classA();
 
private:
    Ui::board *ui;   
    classB *b;
};
 
classA::classA(...) : QWidget(...)
{
    b = new classB(this);
 
    connect(ui->button, SIGNAL(clicked()), b, SLOT(f()));
}

class classA : public QWidget
{
    Q_OBJECT

public:
   classA(QWidget *parent = 0);
    ~classA();

private:
    Ui::board *ui;   
    classB *b;
};

classA::classA(...) : QWidget(...)
{
    b = new classB(this);

    connect(ui->button, SIGNAL(clicked()), b, SLOT(f()));
}

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class classB: public QWidget
{
    Q_OBJECT
 
public:
   classB(QWidget *parent = 0);
    ~classB();
 
public slots:
   void f();
};

class classB: public QWidget
{
    Q_OBJECT

public:
   classB(QWidget *parent = 0);
    ~classB();

public slots:
   void f();
};

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This is the solution simplest solution. But I dont want to have the object B (from classB) membres of the classA.

I don't know if there is a solution to list all the Qwidgets present in an application to call their functions ????

[saa7_go]

You can create custom signal in your classA, for example buttonClicked(), that will be emitted whenever ui->button clicked() signal is emitted. So, you can connect buttonClicked() signal from classA instance to F() slot from classB instance without classB instance to be a member of classA.

Or you can create a function that return a pointer to ui->button.

class classA : public QWidget
{
    Q_OBJECT
public:
   classA(QWidget *parent = 0);
   QPushButton *button();
   ~classA();
 
signals:
   void buttonClicked();
 
private:
    Ui::board *ui;   
};
 
classA::classA(QWidget *parent) : QWidget(parent), ui(new Ui::board)
{
	ui->setupUi(this);
	connect(ui->button, SIGNAL(clicked()), this, SIGNAL(buttonClicked()));
}
 
QPushButton* classA::button()
{
	return ui->button;
}

class classA : public QWidget
{
    Q_OBJECT
public:
   classA(QWidget *parent = 0);
   QPushButton *button();
   ~classA();
	
signals:
   void buttonClicked();

private:
    Ui::board *ui;   
};

classA::classA(QWidget *parent) : QWidget(parent), ui(new Ui::board)
{
	ui->setupUi(this);
	connect(ui->button, SIGNAL(clicked()), this, SIGNAL(buttonClicked()));
}

QPushButton* classA::button()
{
	return ui->button;
}

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class classB: public QWidget
{
    Q_OBJECT
 
public:
   classB(QWidget *parent = 0);
    ~classB();
 
public slots:	
   void F();
};

class classB: public QWidget
{
    Q_OBJECT

public:
   classB(QWidget *parent = 0);
    ~classB();
	
public slots:	
   void F();
};

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classA a;
classB b;
QObject::connect(&a, SIGNAL(buttonClicked()), &b, SLOT(F()));
// or
QObject::connect(a.button(), SIGNAL(clicked()), &b, SLOT(F()));

classA a;
classB b;
QObject::connect(&a, SIGNAL(buttonClicked()), &b, SLOT(F()));
// or
QObject::connect(a.button(), SIGNAL(clicked()), &b, SLOT(F()));

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