Qt attribute(property) binding to QLabel

Question

Hi I'm pretty new in Qt.

Can I binding class attribute(or property) to QLabel text? For example,

class Dog{
    string name;
}

QLabel lbl;

When I change dog's name, I'd like to change lbl.text

Answer 1

In Qt things that you are talking about - territory of signals and slots good way to do:

Dog.h

#ifndef DOG_H
#define DOG_H

#include "QObject"

class Dog: public QObject
{
    Q_OBJECT
public:
    void setDogsName(const QString &name)
    {
        m_Name = name;
        emit dogsNameChanged(name);
    }
signals:
    void dogsNameChanged(const QString &name);

private:
    QString m_Name;
};

#endif // DOG_H

Q_OBJECT macro need for signals/slots connections works (and its got to be in private section/above public:). Code got to be in separated.h file ( )

main:

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QLabel lbl;
    Dog dog;
    QObject::connect(&dog, &Dog::dogsNameChanged, &lbl, &QLabel::setText);
    dog.setDogsName("TEST");
    lbl.show();
    return a.exec();
}

result: here

read about connections in Qt https://doc.qt.io/qt-6/signalsandslots.html