qt6 시그널

#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]