Qt 未发出快速信号

Question

EDIT

I didn't found a way to access the active instance of the Class-Object so I transfered all Q_PROPERTIES into one Class, which lets them interact which each other. Not so clean and OOP-ish but it works.

---

I have a class where I receive data from an REST-Call. With this data, I'd like to call Q_PROPERTY Setter-Function of another class, which works fine. I can read my properties in Debug-Mode. But one thing is not working: calling the Q_PROPERTY -Setter-Functions from another class, will not emitting the signal (normally triggered when this property has been changed).

I am using the Q_PROPERTY with read, write notify functionality ( Q_PROPERTY(QUuid id READ getId WRITE setId NOTIFY idChanged ). After initalizing the Class via qmlRegisterType<VF_Kiste>("qt.kiste", 1,0, "Kiste"); in main.cpp I can access the property in QML.

Setter:

void VF_Kiste::setId(const QUuid& id)
{
    if (id == _id)
      return;
    
    _id = id;
    emit idChanged();
}

So calling this Setter-Function will change the property (I tried this and it works) but is not emitting the signal I need for the QML-Part. Here is where I call the setter.

VF_Kiste* kst = new VF_Kiste();
...

kst->setId(...);

In QML I'd like to call the onIdChanged() -Function of this described function, but without emitting the signal I cannot access the changed value of the property.

Also I tried calling the Q_PROPERTY from QML directly and not from the inherited class, this works as well, so the problem is in calling the setter from another class.

Answer 1

EDIT

I didn't found a way to access the active instance of the Class-Object so I transfered all Q_PROPERTIES into one Class, which lets them interact which each other. Not so clean and OOP-ish but it works.

---

I have a class where I receive data from an REST-Call. With this data, I'd like to call Q_PROPERTY Setter-Function of another class, which works fine. I can read my properties in Debug-Mode. But one thing is not working: calling the Q_PROPERTY -Setter-Functions from another class, will not emitting the signal (normally triggered when this property has been changed).

I am using the Q_PROPERTY with read, write notify functionality ( Q_PROPERTY(QUuid id READ getId WRITE setId NOTIFY idChanged ). After initalizing the Class via qmlRegisterType<VF_Kiste>("qt.kiste", 1,0, "Kiste"); in main.cpp I can access the property in QML.

Setter:

void VF_Kiste::setId(const QUuid& id)
{
    if (id == _id)
      return;
    
    _id = id;
    emit idChanged();
}

So calling this Setter-Function will change the property (I tried this and it works) but is not emitting the signal I need for the QML-Part. Here is where I call the setter.

VF_Kiste* kst = new VF_Kiste();
...

kst->setId(...);

In QML I'd like to call the onIdChanged() -Function of this described function, but without emitting the signal I cannot access the changed value of the property.

Also I tried calling the Q_PROPERTY from QML directly and not from the inherited class, this works as well, so the problem is in calling the setter from another class.