qqmlhelpers.h

#ifndef QQMLHELPERS_H
#define QQMLHELPERS_H

#include <QObject>

#define QML_WRITABLE_PROPERTY(type, name)                                       \
protected:                                                                      \
    Q_PROPERTY(type name READ get_##name WRITE set_##name NOTIFY name##Changed) \
private:                                                                        \
    type m_##name;                                                              \
                                                                                \
public:                                                                         \
    type get_##name() const { return m_##name; }                                \
public Q_SLOTS:                                                                 \
    bool set_##name(type name)                                                  \
    {                                                                           \
        bool ret= false;                                                        \
        if((ret= m_##name != name))                                             \
        {                                                                       \
            m_##name= name;                                                     \
            emit name##Changed(m_##name);                                       \
        }                                                                       \
        return ret;                                                             \
    }                                                                           \
Q_SIGNALS:                                                                      \
    void name##Changed(type name);                                              \
                                                                                \
private:

#define QML_READONLY_PROPERTY(type, name)                      \
protected:                                                     \
    Q_PROPERTY(type name READ get_##name NOTIFY name##Changed) \
private:                                                       \
    type m_##name;                                             \
                                                               \
public:                                                        \
    type get_##name() const { return m_##name; }               \
    bool update_##name(type name)                              \
    {                                                          \
        bool ret= false;                                       \
        if((ret= m_##name != name))                            \
        {                                                      \
            m_##name= name;                                    \
            emit name##Changed(m_##name);                      \
        }                                                      \
        return ret;                                            \
    }                                                          \
Q_SIGNALS:                                                     \
    void name##Changed(type name);                             \
                                                               \
private:

#define QML_CONSTANT_PROPERTY(type, name)          \
protected:                                         \
    Q_PROPERTY(type name READ get_##name CONSTANT) \
private:                                           \
    type m_##name;                                 \
                                                   \
public:                                            \
    type get_##name() const { return m_##name; }   \
                                                   \
private:

#define QML_LIST_PROPERTY(CLASS, NAME, TYPE)                           \
public:                                                                \
    static int NAME##_count(QQmlListProperty<TYPE>* prop)              \
    {                                                                  \
        CLASS* instance= qobject_cast<CLASS*>(prop->object);           \
        return (instance != NULL ? instance->m_##NAME.count() : 0);    \
    }                                                                  \
    static void NAME##_clear(QQmlListProperty<TYPE>* prop)             \
    {                                                                  \
        CLASS* instance= qobject_cast<CLASS*>(prop->object);           \
        if(instance != NULL)                                           \
        {                                                              \
            instance->m_##NAME.clear();                                \
        }                                                              \
    }                                                                  \
    static void NAME##_append(QQmlListProperty<TYPE>* prop, TYPE* obj) \
    {                                                                  \
        CLASS* instance= qobject_cast<CLASS*>(prop->object);           \
        if(instance != NULL && obj != NULL)                            \
        {                                                              \
            instance->m_##NAME.append(obj);                            \
        }                                                              \
    }                                                                  \
    static TYPE* NAME##_at(QQmlListProperty<TYPE>* prop, int idx)      \
    {                                                                  \
        CLASS* instance= qobject_cast<CLASS*>(prop->object);           \
        return (instance != NULL ? instance->m_##NAME.at(idx) : NULL); \
    }                                                                  \
    QList<TYPE*> get_##NAME##s(void) const { return m_##NAME; }        \
                                                                       \
private:                                                               \
    QList<TYPE*> m_##NAME;

#define QML_ENUM_CLASS(name, ...) \
    class name : public QObject   \
    {                             \
        Q_GADGET                  \
    public:                       \
        enum Type                 \
        {                         \
            __VA_ARGS__           \
        };                        \
        Q_ENUMS(Type)             \
    };

class QmlProperty : public QObject
{
    Q_OBJECT
}; // NOTE : to avoid "no suitable class found" MOC note

#endif // QQMLHELPERS_H