Signal from QList Object to Slot from parent

[Rocken]

I want to relay/concatenate a signal from an object I put into a QList to its parent to trigger a redraw of the parent object. But where to put the connect()?

void Desktop::addTray(Tray tray) {
        trayList.append(tray);
    }
 
    void Tray::setColor(int number, QColor color) {
        pointList[number].setColor(color);
        emit dataChanged();
    }

void Desktop::addTray(Tray tray) {
        trayList.append(tray);
    }
     
    void Tray::setColor(int number, QColor color) {
        pointList[number].setColor(color);
        emit dataChanged();
    }

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If I append a new tray object to the desktop I copy the object not a pointer to it. So If I would write the connect() after line 2, I wouldn’t connect to the object within the trayList.

[yeye_olive]

In order for Tray to have slots, it must be derived from QObject. If you tried to compile your example you would get an error as QObject-derived classes are non-copiable. What you need to do is store pointers to the Tray objects in the list and manage the memory of course.