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     2 **

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

     4 ** All rights reserved.

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

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

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    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

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    40 ****************************************************************************/

    41 

    42 #ifndef QDECLARATIVEEXPRESSION_H

    43 #define QDECLARATIVEEXPRESSION_H

    44 

    45 #include <QtDeclarative/qdeclarativeerror.h>

    46 

    47 #include <QtCore/qobject.h>

    48 #include <QtCore/qvariant.h>

    49 

    50 QT_BEGIN_HEADER

    51 

    52 QT_BEGIN_NAMESPACE

    53 

    54 QT_MODULE(Declarative)

    55 

    56 class QString;

    57 class QDeclarativeRefCount;

    58 class QDeclarativeEngine;

    59 class QDeclarativeContext;

    60 class QDeclarativeExpressionPrivate;

    61 class QDeclarativeContextData;

    62 class Q_DECLARATIVE_EXPORT QDeclarativeExpression : public QObject

    63 {

    64     Q_OBJECT

    65 public:

    66     QDeclarativeExpression();

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

    68     virtual ~QDeclarativeExpression();

    69 

    70     QDeclarativeEngine *engine() const;

    71     QDeclarativeContext *context() const;

    72 

    73     QString expression() const;

    74     void setExpression(const QString &);

    75 

    76     bool notifyOnValueChanged() const;

    77     void setNotifyOnValueChanged(bool);

    78 

    79     QString sourceFile() const;

    80     int lineNumber() const;

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

    82 

    83     QObject *scopeObject() const;

    84 

    85     bool hasError() const;

    86     void clearError();

    87     QDeclarativeError error() const;

    88 

    89     QVariant evaluate(bool *valueIsUndefined = 0);

    90 

    91 Q_SIGNALS:

    92     void valueChanged();

    93 

    94 protected:

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

    96                            QDeclarativeExpressionPrivate &dd);

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

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

    99 

   100 private:

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

   102 

   103     Q_DISABLE_COPY(QDeclarativeExpression)

   104     Q_DECLARE_PRIVATE(QDeclarativeExpression)

   105     Q_PRIVATE_SLOT(d_func(), void _q_notify())

   106     friend class QDeclarativeDebugger;

   107     friend class QDeclarativeContext;

   108     friend class QDeclarativeVME;

   109 };

   110 

   111 QT_END_NAMESPACE

   112 

   113 QT_END_HEADER

   114 

   115 #endif // QDECLARATIVEEXPRESSION_H

   116