In Qt4.8, add a QToolButton to a QMenu, the auto connect not work

Question

I have a QToolButton button1 with a popup QMenu menu. I add another QToolButton button2 into the menu. I have already defined the ObjectName. But the auto connect only works for button1, not button2.

For the main window

QToolButton *button1 = new QToolButton();
button1->setObjectName("action1");
button1->setText("Save");

button1->setPopupMode(QToolButton::MenuButtonPopup);

QToolButton *button2 = new QToolButton();
button2->setObjectName("action2");
button2->setText("Save11");

QMenu *pMenu = new QMenu("Title");

QWidgetAction *ptoolButtonAction = new QWidgetAction(pMenu);
ptoolButtonAction->setDefaultWidget(button2);
pMenu->addAction(ptoolButtonAction);

button1 ->setMenu(pMenu);               

QMetaObject::connectSlotsByName(this);

For the public slots part

void MyClass::on_action1_clicked()
{
    qDebug() << "action1 is clicked";
}


void MyClass::on_action2_clicked()
{
    qDebug() << "action2 is clicked";
}

button and menu look like

In the terminal, when I click button1 "Save", it shows the "action1 is clicked." But when I click button2 "Save1", it shows nothing.

Update: Solve the issue by fixing

QMenu *pMenu = new QMenu("Title", this);

also, the objectName should by unique, or the auto connect will fail for others.

Answer 1

Your QObject hierarchy is flawed because you do not set an owner for the QToolButtons and the QMenu. connectSlotsByName walks the hierarchy to find objects and signals matching slots.