Nested classes and problem with meta-object system

[Momergil]

Hello!

I want to create a class and nest it inside the unique other class that will be using it. This nested class is a QObject derived one, being a reimplementation of QVariantAnimation.

The problem is that when I put it inside my base class, the compiler states "error 1" after the message "Error: Meta object features not supported for nested classes".

class MessageFrame : public QFrame
{
    Q_OBJECT
    Q_PROPERTY(QString currentText READ currentText WRITE setCurrentText)
    Q_ENUMS(Icon)
    Q_ENUMS(TextType)
 
    class MessageFrameAnimator : public QVariantAnimation
    {
        Q_OBJECT
    public:
        MessageFrameAnimator(QObject* parent = 0) :
            QVariantAnimation(parent)
        {}
 
        virtual ~MessageFrameAnimator() {}
 
    protected:
        void updateCurrentValue(const QVariant & value) //Does nothing
        {
            Q_UNUSED(value);
        }
    };
 
public:
    //...

class MessageFrame : public QFrame
{
    Q_OBJECT
    Q_PROPERTY(QString currentText READ currentText WRITE setCurrentText)
    Q_ENUMS(Icon)
    Q_ENUMS(TextType)

    class MessageFrameAnimator : public QVariantAnimation
    {
        Q_OBJECT
    public:
        MessageFrameAnimator(QObject* parent = 0) :
            QVariantAnimation(parent)
        {}

        virtual ~MessageFrameAnimator() {}

    protected:
        void updateCurrentValue(const QVariant & value) //Does nothing
        {
            Q_UNUSED(value);
        }
    };

public:
    //...

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It's not imperative to use this class as a nested one, but I'm still curious how to solve this problem - if there is any solution to it. Does somebody knows how to nest my class correctly?

Thanks,

Momergil