/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtDeclarative module of the Qt Toolkit.
**
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** Beta Release License Agreement.
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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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
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** packaging of this file.  Please review the following information to
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****************************************************************************/

#ifndef QMLBINDING_H
#define QMLBINDING_H

#include <QtCore/QObject>
#include <QtDeclarative/qfxglobal.h>
#include <QtDeclarative/qml.h>
#include <QtDeclarative/qmlpropertyvaluesource.h>
#include <QtDeclarative/qmlexpression.h>
#include <QtCore/QMetaProperty>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

class QmlAbstractBinding 
{
public:
    QmlAbstractBinding();
    virtual ~QmlAbstractBinding();

    virtual QString expression() const;

    void setEnabled(bool e) { setEnabled(e, QmlMetaProperty::DontRemoveBinding); }
    virtual void setEnabled(bool, QmlMetaProperty::WriteFlags) = 0;
    virtual int propertyIndex() = 0;

    void update() { update(QmlMetaProperty::DontRemoveBinding); }
    virtual void update(QmlMetaProperty::WriteFlags) = 0;

    void addToObject(QObject *);
    void removeFromObject();

private:
    friend class QmlDeclarativeData;
    friend class QmlMetaProperty;
    friend class QmlMetaPropertyPrivate;
    friend class QmlVME;

    QObject *m_object;
    QmlAbstractBinding **m_mePtr;
    QmlAbstractBinding **m_prevBinding;
    QmlAbstractBinding  *m_nextBinding;
};

class QmlContext;
class QmlBindingPrivate;
class Q_DECLARATIVE_EXPORT QmlBinding : public QmlExpression, 
                                        public QmlAbstractBinding
{
Q_OBJECT
public:
    QmlBinding(const QString &, QObject *, QmlContext *, QObject *parent=0);
    QmlBinding(void *, QmlRefCount *, QObject *, QmlContext *, const QUrl &, int, 
               QObject *parent);
    ~QmlBinding();

    void setTarget(const QmlMetaProperty &);
    QmlMetaProperty property() const;

    bool enabled() const;

    // Inherited from  QmlAbstractBinding
    virtual void setEnabled(bool, QmlMetaProperty::WriteFlags flags);
    virtual int propertyIndex();
    virtual void update(QmlMetaProperty::WriteFlags flags);
    virtual QString expression() const;

public Q_SLOTS:
    void update() { update(QmlMetaProperty::DontRemoveBinding); }

protected:
    virtual void valueChanged();

private:
    Q_DECLARE_PRIVATE(QmlBinding)
};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QmlBinding);

QT_END_HEADER

#endif // QMLBINDING_H