how to expose subclass methods to qml

srikanth2006

Hi I have a main class which has instances of many subclasses. I would like to expose all methods of class and its instances of subclasess to QML.
Similar Question like below but the answer received not working.
https://stackoverflow.com/questions/44056476/accessing-instances-of-a-class-from-qml-context

GrecKo

Define "not working", that's not a good diagnosis.

Show us your code.

Pablo J. Rogina

@srikanth2006 said in how to expose subclass methods to qml:

of many subclasses.

Just in case, please note that the example for the link you posted has no "subclassing" action at all, i.e. SubClass is not a subclass of MainClass, they're both subclasses of QObject.

class MainClass: QObject
{
   Q_OBJECT
   Subclass subclass;
   MainClass();

}

class Subclass:QObject
{
  Q_Object
  Subclass();

  public slots:
  void someMethod();
}

srikanth2006

Hi ,
Sorry I will reframe my question with some code below:
So I have a mainWindowClass and DeviceManagerclass. In mainWindowclass I instantiate object of deviceManagerClass. like below:

#include "devicemanagerdialog.h"
class MainWindow : public QObject
{
Q_OBJECT
public:
explicit MainWindow(QObject *parent = nullptr);
~MainWindow();
//Some signals and some slots etc
DeviceManagerDialog *deviceManagerDialogObj = new DeviceManagerDialog();
}

IN QML main cpp
#include <QQmlContext>
#include "mainwindow.h"
MainWindow mainWindow_C_QML;
QGuiApplication app(argc, argv);

QQmlApplicationEngine engine;
engine.rootContext()->setContextProperty("mainWindowQML",&mainWindow_C_QML);

So I expected in main.qml that deviceManagerDialogObj and itsmethods are exposed. However I can only mainWindowQML methods but not like mainWindowQML.deviceManagerDialogObj->...

My question is how can I access deviceManagerDialogObj and all its methods instantied in mainWindow class . I hope it is clear? Thanks

Pablo J. Rogina

@srikanth2006 said in how to expose subclass methods to qml:

mainWindowQML.deviceManagerDialogObj

You won't access such component not in QML or even in C++ because:

...
private:
DeviceManagerDialog *deviceManagerDialogObj = new DeviceManagerDialog();
}

you made it a private member of MainWindow!

You will need to provide getter(s) for such element.

srikanth2006

ah yes sorry that was public. It is not private. It is typo.
I cant access them even when it is public. I hope it is possible?