Virtual class as a QWidget interface and dependency inversion principle.

[porterneon]

Hi
I have classes named IStorage and Storage. For example:

class IStorage : public QWidget {
    Q_OBJECT
public:
    virtual void Method1(const QString &par1);
 
signals:
    void IStorageSignal1(const QString &par1);
 
public slots:
    virtual void SetVariableValue(const int &val);
};

class IStorage : public QWidget {
    Q_OBJECT
public:
    virtual void Method1(const QString &par1);

signals:
    void IStorageSignal1(const QString &par1);

public slots:
    virtual void SetVariableValue(const int &val);
};

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and

namespace Ui {
    class Storage ;
}
class Storage : public IStorage {
    Q_OBJECT
public:
    explicit Storage();
public slots:
    void SetVariableValue(const int &val);
private:
    int localVariable;
};

namespace Ui {
    class Storage ;
}
class Storage : public IStorage {
    Q_OBJECT
public:
    explicit Storage();
public slots:
    void SetVariableValue(const int &val);
private:
    int localVariable;
};

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How to (fallowing dependency inversion principle) implement class "MainWidgetDisplay" to make it independent from IStorage and to be able to connect with IStorage's signals and slots?