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** This file is part of the QtDeclarative module of the Qt Toolkit.

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**

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

#ifndef QDECLARATIVEBINDING_P_H

#define QDECLARATIVEBINDING_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 "qdeclarative.h"

#include "qdeclarativepropertyvaluesource.h"

#include "qdeclarativeexpression.h"

#include "qdeclarativeproperty.h"

#include "private/qdeclarativeproperty_p.h"

#include <QtCore/QObject>

#include <QtCore/QMetaProperty>

QT_BEGIN_NAMESPACE

class Q_DECLARATIVE_EXPORT QDeclarativeAbstractBinding

{

public:

    QDeclarativeAbstractBinding();

    virtual void destroy();

    virtual QString expression() const;

    enum Type { PropertyBinding, ValueTypeProxy };

    virtual Type bindingType() const { return PropertyBinding; }

    void setEnabled(bool e) { setEnabled(e, QDeclarativePropertyPrivate::DontRemoveBinding); }

    virtual void setEnabled(bool, QDeclarativePropertyPrivate::WriteFlags) = 0;

    virtual int propertyIndex() = 0;

    void update() { update(QDeclarativePropertyPrivate::DontRemoveBinding); }

    virtual void update(QDeclarativePropertyPrivate::WriteFlags) = 0;

    void addToObject(QObject *);

    void removeFromObject();

protected:

    virtual ~QDeclarativeAbstractBinding();

    void clear();

private:

    friend class QDeclarativeData;

    friend class QDeclarativeValueTypeProxyBinding;

    friend class QDeclarativePropertyPrivate;

    friend class QDeclarativeVME;

    QObject *m_object;

    QDeclarativeAbstractBinding **m_mePtr;

    QDeclarativeAbstractBinding **m_prevBinding;

    QDeclarativeAbstractBinding  *m_nextBinding;

};

class QDeclarativeValueTypeProxyBinding : public QDeclarativeAbstractBinding

{

public:

    QDeclarativeValueTypeProxyBinding(QObject *o, int coreIndex);

    virtual Type bindingType() const { return ValueTypeProxy; }

    virtual void setEnabled(bool, QDeclarativePropertyPrivate::WriteFlags);

    virtual int propertyIndex();

    virtual void update(QDeclarativePropertyPrivate::WriteFlags);

    QDeclarativeAbstractBinding *binding(int propertyIndex);

protected:

    ~QDeclarativeValueTypeProxyBinding();

private:

    void recursiveEnable(QDeclarativeAbstractBinding *, QDeclarativePropertyPrivate::WriteFlags);

    void recursiveDisable(QDeclarativeAbstractBinding *);

    friend class QDeclarativeAbstractBinding;

    QObject *m_object;

    int m_index;

    QDeclarativeAbstractBinding *m_bindings;

};

class QDeclarativeContext;

class QDeclarativeBindingPrivate;

class Q_DECLARATIVE_EXPORT QDeclarativeBinding : public QDeclarativeExpression, public QDeclarativeAbstractBinding

{

Q_OBJECT

public:

    QDeclarativeBinding(const QString &, QObject *, QDeclarativeContext *, QObject *parent=0);

    QDeclarativeBinding(const QString &, QObject *, QDeclarativeContextData *, QObject *parent=0);

    QDeclarativeBinding(void *, QDeclarativeRefCount *, QObject *, QDeclarativeContextData *, 

                        const QString &, int, QObject *parent);

    void setTarget(const QDeclarativeProperty &);

    QDeclarativeProperty property() const;

    bool enabled() const;

    // Inherited from  QDeclarativeAbstractBinding

    virtual void setEnabled(bool, QDeclarativePropertyPrivate::WriteFlags flags);

    virtual int propertyIndex();

    virtual void update(QDeclarativePropertyPrivate::WriteFlags flags);

    virtual QString expression() const;

public Q_SLOTS:

    void update() { update(QDeclarativePropertyPrivate::DontRemoveBinding); }

protected:

    ~QDeclarativeBinding();

    void emitValueChanged();

private:

    Q_DECLARE_PRIVATE(QDeclarativeBinding)

};

QT_END_NAMESPACE

Q_DECLARE_METATYPE(QDeclarativeBinding*)

#endif // QDECLARATIVEBINDING_P_H