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#ifndef CUSTOMPROPERTYANIMATION_H
#define CUSTOMPROPERTYANIMATION_H

#include <QtCore/qvariantanimation.h>

QT_BEGIN_NAMESPACE
class QGraphicsItem;
QT_END_NAMESPACE

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