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

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

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** 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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**

** In addition, as a special exception, Nokia gives you certain additional

** 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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** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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

#ifndef QDECLARATIVEEXPRESSION_H

#define QDECLARATIVEEXPRESSION_H

#include <QtDeclarative/qdeclarativeerror.h>

#include <QtCore/qobject.h>

#include <QtCore/qvariant.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Declarative)

class QString;

class QDeclarativeRefCount;

class QDeclarativeEngine;

class QDeclarativeContext;

class QDeclarativeExpressionPrivate;

class QDeclarativeContextData;

class Q_DECLARATIVE_EXPORT QDeclarativeExpression : public QObject

{

    Q_OBJECT

public:

    QDeclarativeExpression();

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

    virtual ~QDeclarativeExpression();

    QDeclarativeEngine *engine() const;

    QDeclarativeContext *context() const;

    QString expression() const;

    void setExpression(const QString &);

    bool notifyOnValueChanged() const;

    void setNotifyOnValueChanged(bool);

    QString sourceFile() const;

    int lineNumber() const;

    void setSourceLocation(const QString &fileName, int line);

    QObject *scopeObject() const;

    bool hasError() const;

    void clearError();

    QDeclarativeError error() const;

    QVariant evaluate(bool *valueIsUndefined = 0);

Q_SIGNALS:

    void valueChanged();

protected:

    QDeclarativeExpression(QDeclarativeContextData *, QObject *, const QString &,

                           QDeclarativeExpressionPrivate &dd);

    QDeclarativeExpression(QDeclarativeContextData *, void *, QDeclarativeRefCount *rc, 

                           QObject *me, const QString &, int, QDeclarativeExpressionPrivate &dd);

private:

    QDeclarativeExpression(QDeclarativeContextData *, QObject *, const QString &);

    Q_DISABLE_COPY(QDeclarativeExpression)

    Q_DECLARE_PRIVATE(QDeclarativeExpression)

    Q_PRIVATE_SLOT(d_func(), void _q_notify())

    friend class QDeclarativeDebugger;

    friend class QDeclarativeContext;

    friend class QDeclarativeVME;

};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QDECLARATIVEEXPRESSION_H