demos/sub-attaq/custompropertyanimation.h

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  41
  42 #ifndef CUSTOMPROPERTYANIMATION_H
  43 #define CUSTOMPROPERTYANIMATION_H
  44
  45 #include <QtCore/qvariantanimation.h>
  46
  47 QT_BEGIN_NAMESPACE
  48 class QGraphicsItem;
  49 QT_END_NAMESPACE
  50
  51 struct AbstractProperty
  52 {
  53     virtual QVariant read() const = 0;
  54     virtual void write(const QVariant &value) = 0;
  55 };
  56
  57
  58 class CustomPropertyAnimation : public QVariantAnimation
  59 {
  60     Q_OBJECT
  61
  62     template <typename Target, typename T, typename T2 = T>
  63     class MemberFunctionProperty : public AbstractProperty
  64     {
  65     public:
  66         typedef T (Target::*Getter)(void) const;
  67         typedef void (Target::*Setter)(T2);
  68
  69         MemberFunctionProperty(Target* target, Getter getter, Setter setter)
  70             : m_target(target), m_getter(getter), m_setter(setter) {}
  71
  72         virtual void write(const QVariant &value)
  73         {
  74             if (m_setter) (m_target->*m_setter)(qVariantValue<T>(value));
  75         }
  76
  77         virtual QVariant read() const
  78         {
  79             if (m_getter) return qVariantFromValue<T>((m_target->*m_getter)());
  80             return QVariant();
  81         }
  82
  83     private:
  84         Target *m_target;
  85         Getter m_getter;
  86         Setter m_setter;
  87     };
  88
  89 public:
  90     CustomPropertyAnimation(QObject *parent = 0);
  91     ~CustomPropertyAnimation();
  92
  93     template<class Target, typename T>
  94     void setMemberFunctions(Target* target, T (Target::*getter)() const, void (Target::*setter)(const T& ))
  95     {
  96         setProperty(new MemberFunctionProperty<Target, T, const T&>(target, getter, setter));
  97     }
  98
  99     template<class Target, typename T>
 100     void setMemberFunctions(Target* target, T (Target::*getter)() const, void (Target::*setter)(T))
 101     {
 102         setProperty(new MemberFunctionProperty<Target, T>(target, getter, setter));
 103     }
 104
 105     void updateCurrentValue(const QVariant &value);
 106     void updateState(QAbstractAnimation::State oldState, QAbstractAnimation::State newState);
 107     void setProperty(AbstractProperty *animProp);
 108
 109 private:
 110     Q_DISABLE_COPY(CustomPropertyAnimation);
 111     AbstractProperty *animProp;
 112 };
 113
 114 #endif // CUSTOMPROPERTYANIMATION_H