#include <QObject>
class Counter : public QObject
{
Q_OBJECT
// Note. The Q_OBJECT macro starts a private section.
// To declare public members, use the 'public:' access modifier.
public:
Counter() { m_value = 0; }
int value() const { return m_value; }
public slots:
void setValue(int value);
signals:
void valueChanged(int newValue);
private:
int m_value;
};
void Counter::setValue(int value)
{
if (value != m_value) {
m_value = value;
emit valueChanged(value);
}
} |
Counter a, b;
QObject::connect(&a, &Counter::valueChanged, &b, &Counter::setValue);
a.setValue(12); // a.value() == 12, b.value() == 12
b.setValue(48); // a.value() == 12, b.value() == 48 |
[링크 : https://doc.qt.io/qt-6/ko/signalsandslots.html]
[링크 : https://doc.qt.io/qt-6/ko/moc.html]
QT5(람다) / QT4 - 근데 람다 쓴다고 receiver도 사라질수 있나? this 어디갔지?
Qt 5 이상 스타일 (람다 함수 지원)
connect(sender, &Sender::signal, receiver, &Receiver::slot);
// 람다 함수 연결
connect(button, &QPushButton::clicked, []() {
qDebug() << "Button clicked!";
});
Qt 4 이하 스타일
connect(sender, SIGNAL(signalName()), receiver, SLOT(slotName())); |
[링크 : https://cagongman.tistory.com/109]
// new style
connect(&myObject, &SignalSlot::valueChanged, this, &Widget::setValue);
// old style
//connect(&myObject, SIGNAL(valueChanged(int)), this, SLOT(setValue(int))); |
[링크 : https://dongyeop00.tistory.com/78]
[링크 : https://truelightn.tistory.com/6]
+
2026.05.07
QT5 signal / slot / connect / emit
[링크 : https://bovit.tistory.com/103]
[링크 : https://kwonik2304.tistory.com/40]
+
by gpt
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
newpage = new NewPage();
// .. QStackedWidget 생략
connect(newpage, &NewPage::goHome, this, [=]() { stack->setCurrentWidget(home); });
} |
class NewPage : public QWidget
{
Q_OBJECT
public:
explicit NewPage(QWidget *parent = nullptr);
~NewPage();
private slots:
void on_pushButton_clicked();
private:
Ui::NewPage *ui;
signals:
void goHome();
};
void NewPage::on_pushButton_clicked()
{
emit goHome();
}
|
+
qt5 signal
[링크 : https://wiki.qt.io/New_Signal_Slot_Syntax]
[링크 : https://forum.qt.io/topic/123639/how-connect-customwiget-signals-and-slots/7]
