path: root/src/declarative/qml/qdeclarativeprivate.h

/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
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** This file is part of the QtDeclarative module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** file. Please review the following information to ensure the GNU Lesser
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
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** Alternatively, this file may be used in accordance with the terms and
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****************************************************************************/

#ifndef QDECLARATIVEPRIVATE_H
#define QDECLARATIVEPRIVATE_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qglobal.h>
#include <QtCore/qvariant.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

typedef QObject *(*QDeclarativeAttachedPropertiesFunc)(QObject *);

template <typename TYPE>
class QDeclarativeTypeInfo
{
public:
    enum {
        hasAttachedProperties = 0
    };
};


class QDeclarativeCustomParser;
namespace QDeclarativePrivate
{
    void Q_DECLARATIVE_EXPORT qdeclarativeelement_destructor(QObject *);
    template<typename T>
    class QDeclarativeElement : public T
    {
    public:
        virtual ~QDeclarativeElement() { 
            QDeclarativePrivate::qdeclarativeelement_destructor(this); 
        }
    };

    template<typename T>
    void createInto(void *memory) { new (memory) QDeclarativeElement<T>; }

    template<typename T>
    QObject *createParent(QObject *p) { return new T(p); }

    template<class From, class To, int N>
    struct StaticCastSelectorClass
    {
        static inline int cast() { return -1; }
    };

    template<class From, class To>
    struct StaticCastSelectorClass<From, To, sizeof(int)>
    {
        static inline int cast() { return int(reinterpret_cast<quintptr>(static_cast<To *>(reinterpret_cast<From *>(0x10000000)))) - 0x10000000; }
    };

    template<class From, class To>
    struct StaticCastSelector
    {
        typedef int yes_type;
        typedef char no_type;

        static yes_type check(To *);
        static no_type check(...);

        static inline int cast()
        {
            return StaticCastSelectorClass<From, To, sizeof(check(reinterpret_cast<From *>(0)))>::cast();
        }
    };

    template <typename T>
    struct has_attachedPropertiesMember
    {
        static bool const value = QDeclarativeTypeInfo<T>::hasAttachedProperties;
    };

    template <typename T, bool hasMember>
    class has_attachedPropertiesMethod 
    {
    public:
        typedef int yes_type;
        typedef char no_type;

        template<typename ReturnType>
        static yes_type check(ReturnType *(*)(QObject *));
        static no_type check(...);

        static bool const value = sizeof(check(&T::qmlAttachedProperties)) == sizeof(yes_type);
    }; 

    template <typename T>
    class has_attachedPropertiesMethod<T, false>
    {
    public:
        static bool const value = false;
    };

    template<typename T, int N>
    class AttachedPropertySelector
    {
    public:
        static inline QDeclarativeAttachedPropertiesFunc func() { return 0; }
        static inline const QMetaObject *metaObject() { return 0; }
    };
    template<typename T>
    class AttachedPropertySelector<T, 1>
    {
        static inline QObject *attachedProperties(QObject *obj) {
            return T::qmlAttachedProperties(obj);
        }
        template<typename ReturnType>
        static inline const QMetaObject *attachedPropertiesMetaObject(ReturnType *(*)(QObject *)) {
            return &ReturnType::staticMetaObject;
        }
    public:
        static inline QDeclarativeAttachedPropertiesFunc func() {
            return &attachedProperties;
        }
        static inline const QMetaObject *metaObject() {
            return attachedPropertiesMetaObject(&T::qmlAttachedProperties);
        }
    };

    template<typename T>
    inline QDeclarativeAttachedPropertiesFunc attachedPropertiesFunc()
    {
        return AttachedPropertySelector<T, has_attachedPropertiesMethod<T, has_attachedPropertiesMember<T>::value>::value>::func();
    }

    template<typename T>
    inline const QMetaObject *attachedPropertiesMetaObject()
    {
        return AttachedPropertySelector<T, has_attachedPropertiesMethod<T, has_attachedPropertiesMember<T>::value>::value>::metaObject();
    }

    enum AutoParentResult { Parented, IncompatibleObject, IncompatibleParent };
    typedef AutoParentResult (*AutoParentFunction)(QObject *object, QObject *parent);

    struct RegisterType {
        int version;

        int typeId;
        int listId;
        int objectSize;
        void (*create)(void *);
        QString noCreationReason;

        const char *uri;
        int versionMajor;
        int versionMinor;
        const char *elementName;
        const QMetaObject *metaObject;

        QDeclarativeAttachedPropertiesFunc attachedPropertiesFunction;
        const QMetaObject *attachedPropertiesMetaObject;

        int parserStatusCast;
        int valueSourceCast;
        int valueInterceptorCast;

        QObject *(*extensionObjectCreate)(QObject *);
        const QMetaObject *extensionMetaObject;

        QDeclarativeCustomParser *customParser;
        int revision;
        // If this is extended ensure "version" is bumped!!!
    };

    struct RegisterInterface {
        int version;

        int typeId;
        int listId;

        const char *iid;
    };

    struct RegisterAutoParent {
        int version;

        AutoParentFunction function;
    };

    enum RegistrationType {
        TypeRegistration       = 0, 
        InterfaceRegistration  = 1,
        AutoParentRegistration = 2
    };

    int Q_DECLARATIVE_EXPORT qmlregister(RegistrationType, void *);
}

QT_END_NAMESPACE

QT_END_HEADER

#endif // QDECLARATIVEPRIVATE_H