How to call a QProperty binding from a subclass?

Kattia

How i could call the test binding in this case without calling
qobject_cast to transform the QWidget back to PushButton?

qDebug() << listWidget[0]->property("test"); // return invalid
qDebug() < listWidget[0]->test; // error as test is not a property of a QWIDGET
qDebug() << qobject_cast<PushButton*>(listWidget[0])->test; // works

class PushButton : public QPushButton
{
	Q_OBJECT
public:

    QProperty<QString> test;
    PushButton(QWidget* parent = nullptr) : QPushButton(parent)
    {
       test.setBinding([&]() 
       { 
           QString string = "OK";
           return string;
       });
    }
}

PushButton* pushButton = new PushButton;
QList<QWidget*> listWidget { pushButton };

mpergand

@Kattia said in How to call a QProperty binding from a subclass?:

How i could call the test binding in this case without calling
qobject_cast to transform the QWidget back to PushButton?

If your list constains only PushButton objects, you can try:

QList<PushButton*> listWidget { pushButton };

Otherwise a cast is needed.

Kattia

I'm using setProperty to call functions in subclassed classes to avoid casting the widget/including its classes in other files.

Example

class PushButton : public QPushButton
{
	Q_OBJECT
        Q_PROPERTY(bool etc MEMBER etc WRITE callMyFunction);
public:

    bool etc; // unused
    void callMyFunction(bool)
     {
          myFunction();
     }
}

Where w is a QWidget* but from type PushButton*

w->setProperty("etc", true); // The etc variable and its value is ignored, i just want it to call a specific function

The other way would be including "pushbutton.h" casting the QWidget to PushButton and
pushButton->myFunction();

There's a better way to do this?

jsulm

@Kattia said in How to call a QProperty binding from a subclass?:

There's a better way to do this?

No, because there is no virtual function named myFunction anywhere in the class hierarchy. It is defined in PushButton, so you have to cast.

Kattia

@jsulm I have found a "better way" using QMetaObject::invokeMethod and i also can get the return value of the function!
There's any "cons" in calling functions with invokeMethod?