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****************************************************************************/

#ifndef QDECLARATIVEDATA_P_H

#define QDECLARATIVEDATA_P_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 <QtScript/qscriptvalue.h>

#include <private/qobject_p.h>

#include "private/qdeclarativeguard_p.h"

QT_BEGIN_NAMESPACE

class QDeclarativeCompiledData;

class QDeclarativeAbstractBinding;

class QDeclarativeContext;

class QDeclarativePropertyCache;

class QDeclarativeContextData;

// This class is structured in such a way, that simply zero'ing it is the

// default state for elemental object allocations.  This is crucial in the

// workings of the QDeclarativeInstruction::CreateSimpleObject instruction.

// Don't change anything here without first considering that case!

class Q_AUTOTEST_EXPORT QDeclarativeData : public QAbstractDeclarativeData

{

public:

    QDeclarativeData()

        : ownMemory(true), ownContext(false), indestructible(true), explicitIndestructibleSet(false), 

          context(0), outerContext(0), bindings(0), nextContextObject(0), prevContextObject(0), bindingBitsSize(0), 

          bindingBits(0), lineNumber(0), columnNumber(0), deferredComponent(0), deferredIdx(0), 

          attachedProperties(0), scriptValue(0), objectDataRefCount(0), propertyCache(0), guards(0) { 

          init(); 

      }

    static inline void init() {

        QAbstractDeclarativeData::destroyed = destroyed;

        QAbstractDeclarativeData::parentChanged = parentChanged;

    }

    static void destroyed(QAbstractDeclarativeData *, QObject *);

    static void parentChanged(QAbstractDeclarativeData *, QObject *, QObject *);

    void destroyed(QObject *);

    void parentChanged(QObject *, QObject *);

    void setImplicitDestructible() {

        if (!explicitIndestructibleSet) indestructible = false;

    }

    quint32 ownMemory:1;

    quint32 ownContext:1;

    quint32 indestructible:1;

    quint32 explicitIndestructibleSet:1;

    quint32 dummy:28;

    // The context that created the C++ object

    QDeclarativeContextData *context; 

    // The outermost context in which this object lives

    QDeclarativeContextData *outerContext;

    QDeclarativeAbstractBinding *bindings;

    // Linked list for QDeclarativeContext::contextObjects

    QDeclarativeData *nextContextObject;

    QDeclarativeData**prevContextObject;

    int bindingBitsSize;

    quint32 *bindingBits; 

    bool hasBindingBit(int) const;

    void clearBindingBit(int);

    void setBindingBit(QObject *obj, int);

    ushort lineNumber;

    ushort columnNumber;

    QDeclarativeCompiledData *deferredComponent; // Can't this be found from the context?

    unsigned int deferredIdx;

    QHash<int, QObject *> *attachedProperties;

    // ### Can we make this QScriptValuePrivate so we incur no additional allocation

    // cost?

    QScriptValue *scriptValue;

    quint32 objectDataRefCount;

    QDeclarativePropertyCache *propertyCache;

    QDeclarativeGuard<QObject> *guards;

    static QDeclarativeData *get(const QObject *object, bool create = false) {

        QObjectPrivate *priv = QObjectPrivate::get(const_cast<QObject *>(object));

        if (priv->wasDeleted) {

            Q_ASSERT(!create);

            return 0;

        } else if (priv->declarativeData) {

            return static_cast<QDeclarativeData *>(priv->declarativeData);

        } else if (create) {

            priv->declarativeData = new QDeclarativeData;

            return static_cast<QDeclarativeData *>(priv->declarativeData);

        } else {

            return 0;

        }

    }

};

template<class T>

void QDeclarativeGuard<T>::addGuard()

{

    Q_ASSERT(!prev);

    if (QObjectPrivate::get(o)->wasDeleted) 

        return;

    QDeclarativeData *data = QDeclarativeData::get(o, true);

    next = data->guards;

    if (next) reinterpret_cast<QDeclarativeGuard<T> *>(next)->prev = &next;

    data->guards = reinterpret_cast<QDeclarativeGuard<QObject> *>(this);

    prev = &data->guards;

}

template<class T>

void QDeclarativeGuard<T>::remGuard()

{

    Q_ASSERT(prev);

    if (next) reinterpret_cast<QDeclarativeGuard<T> *>(next)->prev = prev;

    *prev = next;

    next = 0;

    prev = 0;

}

QT_END_NAMESPACE

#endif // QDECLARATIVEDATA_P_H