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custompropertyanimation.h Example File
demos/sub-attaq/custompropertyanimation.h

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 #ifndef CUSTOMPROPERTYANIMATION_H
 #define CUSTOMPROPERTYANIMATION_H

 #include <QtCore/qvariantanimation.h>

 class QGraphicsItem;

 struct AbstractProperty
 {
     virtual QVariant read() const = 0;
     virtual void write(const QVariant &value) = 0;
 };

 class CustomPropertyAnimation : public QVariantAnimation
 {
     Q_OBJECT

     template <typename Target, typename T, typename T2 = T>
     class MemberFunctionProperty : public AbstractProperty
     {
     public:
         typedef T (Target::*Getter)(void) const;
         typedef void (Target::*Setter)(T2);

         MemberFunctionProperty(Target* target, Getter getter, Setter setter)
             : m_target(target), m_getter(getter), m_setter(setter) {}

         virtual void write(const QVariant &value)
         {
             if (m_setter) (m_target->*m_setter)(qVariantValue<T>(value));
         }

         virtual QVariant read() const
         {
             if (m_getter) return qVariantFromValue<T>((m_target->*m_getter)());
             return QVariant();
         }

     private:
         Target *m_target;
         Getter m_getter;
         Setter m_setter;
     };

 public:
     CustomPropertyAnimation(QObject *parent = 0);
     ~CustomPropertyAnimation();

     template<class Target, typename T>
     void setMemberFunctions(Target* target, T (Target::*getter)() const, void (Target::*setter)(const T& ))
     {
         setProperty(new MemberFunctionProperty<Target, T, const T&>(target, getter, setter));
     }

     template<class Target, typename T>
     void setMemberFunctions(Target* target, T (Target::*getter)() const, void (Target::*setter)(T))
     {
         setProperty(new MemberFunctionProperty<Target, T>(target, getter, setter));
     }

     void updateCurrentValue(const QVariant &value);
     void updateState(QAbstractAnimation::State oldState, QAbstractAnimation::State newState);
     void setProperty(AbstractProperty *animProp);

 private:
     Q_DISABLE_COPY(CustomPropertyAnimation);
     AbstractProperty *animProp;
 };

 #endif // CUSTOMPROPERTYANIMATION_H